HERO 621H Safety And Operating Manual

Brand: HERO

Model: 621H

Category: Power fine-spray systems

Type: Safety And Operating Manual

This manual is also suitable for

FACTORY LOCATED AT:

720 EATON WAY

DELTA, B.C. CANADA

V3M 6J9

U.S.A ADDRESS:

P.O. BOX 75

CUSTER, WASHINGTON

98240-0075

PHONE: (604) 522-6543 FAX: (604) 522-8735 TOLL FREE: (800) 494-4376

SAFETY AND OPERATING MANUAL

Version 5 Dec 2005

www.hero.ca

WARNING: DO NOT OPERATE THIS EQUIPMENT WITHOUT READING

AND UNDERSTANDING ALL SAFETY AND OPERATING INSTRUCTIONS

SEE PAGES 3 – 14

Owner’s Manual Page 1 EC621 / EC725

TABLE OF CONTENTS

PAGE DESCRIPTION PAGE #

Warranty Information 2

Important Safety Precautions 3-4

Introduction and Unpacking 5

Set Up 6

Start Up 7-8

Spray Tip Selection 8-9

Spray Painting Suggestions 10-11

Pressure Relief, Shut Down and Cleaning 12-13

Filter Maintenance 14

Digital Display Troubleshooting and Diagnostics 15-16

Pump Troubleshooting 17

Pump Cartridge and Intake Valve Removal 18-19

Intake Valve Service 19

Intake Valve Service (Old Version) 20

Pump Cartridge Disassembly and Service 21

Pump Cartridge Assembly 22

Prime Valve Service 23

Pump and Drive Assembly Parts Breakdown 24

Cart Assembly Parts Breakdown 25

Wiring Schematic 26

Parts List and Descriptions 27-30

Airless Accessories 30

Contact Information 31

Owner’s Manual Page 2 EC621 / EC725

H.E.R.O. WARRANTY

H.E.R.O. Products Group, guarantees this airless pump to be free of defects in materials and

workmanship to the original owner, for a period of two (2) full years from the date of purchase.

The warranty entitles the owner to parts replacement at no charge. The parts replacement

warranty is valid for any necessary replacement, weather caused by material or workmanship

defect or simple wear. H.E.R.O. Industries offers no warranty on the hoses, gun, tip or

accessories, plastic, rubber, other soft goods or motor used in or supplied with the H.E.R.O.

sprayer.

In addition to the general coverage listed above, a lifetime WARRANTY is offered on the Drive

Train components. The drive train components are defined as the items contained within, but not

including, the “Drive Housing”. Drive motor is not included.

Furthermore, this warranty does not cover, damage or wear caused by faulty installation,

abrasion, corrosion, inadequate or improper maintenance, negligence, or accident.

Motor, accessories, etc., which are supplied by other manufacturers and are attached to or

supplied with the H.E.R.O. airless pump, are warranted only to the extent that these parts are

warranted by their respective manufacturers. Warranty claims on these items must be made

directly to such manufacturers or their local authorized service depots.

The warranty is only applicable to the original purchaser and provided the equipment has been

properly used, operated and maintained in accordance with all instructions, precautions and

warnings contained in this manual. For the purpose of this warranty, damage resulting from

accident, abuse, improper cleaning, storage, fire, flood, or Act of God, is not covered.

H.E.R.O.’s liability is limited to replacing parts found to be defective or worn and does not include;

transportation costs, damage or other expenses of any kind incurred in connection with the

purchase and use of this sprayer.

Repairs claimed under warranty must be performed by an authorized H.E.R.O. Service Center,

using only genuine H.E.R.O. parts. Parts required under warranty will be supplied by your local

H.E.R.O. Service Center.

DO NOT return warranty parts to factory without authorization.

To qualify for the warranty, the warranty card (attached to this page) supplied with this H.E.R.O.

airless pump, must be completed with equipment serial number and signed by the purchaser,

and postmarked within ten (10) days of purchase.

WARRANTY

Owner’s Manual Page 3 EC621 / EC725

IMPORTANT

AS WITH ALL MECHANICAL EQUIPMENT, PROPER OPERATING AND MAINTENANCE

PROCEDURES ARE REQUIRED TO KEEP YOUR H.E.R.O. AIRLESS PUMP PERFORMING TO

YOUR SATISFACTION. THE FOLLOWING SAFETY, OPERATING AND MAINTENANCE

INSTRUCTIONS ARE IMPORTANT.

Read and understand this manual completely, especially with regard to all safety precautions. Read

and follow instructions on all warning labels on your equipment. Keep these warning labels clean and

readable at all times. Order new labels from your local distributor or from H.E.R.O. Industries if

needed. This system is capable of producing 3000 psi (spray pressure). To avoid rupture and injury

DO NOT operate this pump with components rated less than 3000 psi working pressure (including but

not limited to spray guns, hose and connections). Before servicing, cleaning or removal of any part,

shut off power and relieve pressure. WARNING

Prior to the use of the sprayer, ensure that the grounded continuity between the gun and the sprayer

is maintained. The hose shall be at least 50 feet in length. All hoses, guns, and accessories shall be

suitable for the maximum pressure ( 3000 PSI ). The gun shall be provided with a “Safety” which

locks the trigger in the “OFF” position. DO NOT point the gun at another person or spray at any part

of exposed skin. If there are any special or unique conditions for this machine, they shall be further

noted and addressed and must be followed. The manufacturer shall not be responsible for any loss,

damages, or injury of any kind or nature whatsoever resulting from the use of equipment other than in

strict compliance with the instructions, cautions and warnings contained in this operating and

instruction manual.

Never place fingers near spray tip of gun. Never point gun toward any part of the body, or that of any

other person. Material issuing from the spray tip is at high pressure. If fingers, or any part of the body

are placed near the tip of the spray gun, it is possible that the spray could break the skin and inject

some of the material. If injury does occur, seek immediate medical attention. Inform the doctor

what fluid was injected, if the injury is of an injection nature. Never treat the situation as a simple

matter. Equipment and chemicals, when used improperly can be dangerous.

IMPORTANT SAFETY PRECAUTIONS

 NEVER place any part of the body in front of the spray tip or aim the gun toward any part of

the body.

 NEVER point the gun toward any individual.

 NEVER treat any injury as a simple cut. If injury does occur, seek immediate medical atten-

tion. Inform the doctor what fluid was injected.

 NEVER allow another person to use the sprayer unless they are thoroughly trained on its op-

eration and have read all safety precautions in this manual and all safety warning labels at-

tached to unit.

 NEVER use around children.

 NEVER attempt to perform any maintenance or service on any part of the sprayer without first;

1. Shutting the motor switch to OFF.

2. Relieving all pressure in the pump by triggering the gun.

3. Open prime valve to drain.

4. Locking gun trigger in "LOCKED" position, with gun locked closed.

 NEVER operate the sprayer without the tip guard complete and in place.

 NEVER spray any material in the vicinity of open flame, pilot lights, electrical outlets or any other

source of ignition.

 NEVER spray volatile materials with flash points lower than 140 F (60 C).

Owner’s Manual Page 4 EC621 / EC725

 NEVER attempt to stop any leakage in the paint line or at any fitting with your hand or any part of your

body. Immediately shut off the unit should leakage occur.

 NEVER allow the paint hose to become kinked, or to touch against rough or sharp surfaces.

 NEVER operate the unit at pressures higher than the pressure rating of the lowest rated component in

the system, or the factory preset.

 NEVER spray in an enclosed area. The spraying area must be well ventilated to safely remove

chemical vapors.

 NEVER operate the unit with worn or damaged accessories, or with accessories other than those

supplied by H.E.R.O. Industries, unless the accessories have been first specifically approved in writing

by H.E.R.O. Industries.

 NEVER allow the unit to be serviced or repaired anywhere other than an authorized H.E.R.O. Service

Center, or with other than genuine H.E.R.O. parts or components.

 NEVER leave unit unattended without first shutting off, triggering the gun to relieve all fluid pressure, and

setting the trigger lock on gun in "LOCKED" position.

 ALWAYS follow H.E.R.O. recommendations for operation and safety.

 ALWAYS set trigger lock on gun in "LOCKED" position when not in use.

 ALWAYS check connections and fittings for tightness before operating the unit.

 ALWAYS locate the unit in a well ventilated area a minimum of 25 feet from the spray area.

 ALWAYS ground the unit, the paint containers, and the object being sprayed to eliminate static

discharge. Ensure that all these objects remain grounded throughout the entire spraying operation.

 ALWAYS use accessories and components approved for at least 3000 psi (working pressure).

 ALWAYS use accessories and components only supplied by H.E.R.O. Industries.

 ALWAYS examine accessories for wear or damage before operating the unit.

 ALWAYS use lowest possible pressure when flushing and cleaning the unit, and hold the gun firmly

against a metal container to reduce the possibility of static discharge .

 ALWAYS wear safety glasses when operating the unit.

 ALWAYS wear a face filter mask when operating the unit.

 ALWAYS :

1. Shut the motor switch to OFF.

2. Relieve all pressure in the pump by triggering the gun away from your body .

3. Open prime valve to drain.

4. Lock gun trigger in "LOCKED" position, before attempting to perform any maintenance or service on any

part of the sprayer.

 ALWAYS ensure fire extinguishing equipment is readily available and properly maintained in the spray

area.

 ALWAYS observe good housekeeping and keep the spray area free from obstructions.

 ALWAYS be aware that certain chemicals may react with aluminum, carbide, or other components in the

pump system. Read the manufacturer's label on all materials to be sprayed, and follow the manufacturer's

recommendations. If in doubt, consult your material supplier.

 ALWAYS replace any damaged airless paint hose. A scratched, cut or otherwise damaged outer sheathing

of the paint hose can lead to a rupture. DO NOT attempt to repair a damaged hose.

IMPORTANT SAFETY PRECAUTIONS

WARNING

DO NOT ATTEMPT TO OPERATE THIS MACHINE UNTIL YOU HAVE READ AND UNDERSTOOD ALL

SAFETY PRECAUTIONS AND OPERATING INSTRUCTIONS. EQUIPMENT AND CHEMICALS

WHEN USED IMPROPERLY, CAN BE DANGEROUS.

Owner’s Manual Page 5 EC621 / EC725

INTRODUCTION & UNPACKING

Congratulations on your purchase of a new H.E.R.O. “EC” series airless paint sprayer. We are

sure you will enjoy owning and operating your new sprayer. With H.E.R.O. airless spray equipment

you will enjoy the features and benefits of this airless. You are spraying paint, not air, and the paint

is driven to the painting surface in a clean, fan shaped spray which penetrates all cracks and

corners. To attain these results, you must adjust the pressure as low as possible. We recommend

that you become familiar with your H.E.R.O. unit. Discuss with your dealer the useful accessory

items they do offer - various types of tips, extension poles for hard to reach areas, extra hose, etc.

Use of accessory items is often the difference between a good job and an excellent one !

Your H.E.R.O. airless sprayer has been fully tested and carefully packaged to avoid damage.

It should be carefully examined upon arrival to determine that the unit shows no signs of

freight damage. If any parts are found broken or damaged, immediately contact the

carrier and arrange for an inspection of the concealed damaged. Claims for damage

MUST be made by the CONSIGNEE and not the shipper. The carrier accepts full

responsibility for the safe delivery of merchandise upon pick-up from the shipper.

The unit shipping carton contains:

4-02-40-3PL1

Piston Lube

(8 Ounce Bottle)

Gun/Hose & Tip Packages

Include: 1/4 x 50Ft Hose, Model 300 or

400 Airless Gun, and 517 Spray Tip

EC-2560

Siphon Hose Assembly

(Sled and Cart models)

EC-2600

Siphon Hose Assembly

(High Boy model)

EC-1000

Unitool

(OPTIONAL)

Owner’s Manual Page 6 EC621 / EC725

SET UP

Setting Up:

1. Attach siphon hose assembly to intake valve

by pulling up intake elbow onto intake valve.

2. Lock clip onto intake valve by sliding clip until

it is locked into its designated slot.

3. Connect prime hose to prime hose outlet

making sure that it is wrench tight.

4. Connect airless hose to pump outlet making

sure that it is wrench tight.

5. Connect airless gun to airless hose making

sure that it is wrench tight and slide the trig-

ger safety lock up to lock the trigger closed.

6. Remove spray tip from tip guard. This is done

by twisting the tip until it aligns with the tip

guard opening and then by pulling the tip out

of the housing. The tip guard may have to be

loosened to help remove the spray tip. By

removing the tip this will make flushing out

the storage solution safer and easier.

7. Place siphon tube into one gallon of thinner

or flushing fluid. This will be necessary to

flush storage solution from pump. If using a

highly volatile solvent or paint in a metal con-

tainer it is highly recommended to ground the

container with a grounding wire to ground to

prevent risk of static discharge. If storage so-

lution has been flushed already with thinner,

then sprayer should be flushed with water if

using water base paints or flushed with cor-

rect thinner for oil base paints. Check paint

manufacturer recommendations.

8. Apply packing lubricant. This will help prevent

buildup of materials on the piston rod thus

extending packing life. To add lubricant, in-

sert pointed nozzle of the 3PL liquid into the

slotted area in the front of the unit. Add only a

small amount . This should be done each

time the sprayer is used. Before each use,

flush the pump with the correct thinner for

the paint being used.

NOTE: The unit MUST be stored with mineral

spirits at all times in order to protect pump from

corrosion and extend pump life.

Owner’s Manual Page 7 EC621 / EC725

START UP

Setting Up (Continued):

1. Flip prime valve lever up to open. This is re-

quired to remove air out of the pump.

2. Turn pressure control knob counter clockwise

to lowest set ting. This will cut the power off

until the pressure control knob is turned

clockwise to desired setting.

3. Make sure that the power switch is in the “off”

position and plug the power cord into a 115V,

15 amp., grounded circuit. Note; if using an

extension cord, you must use a #12/3 wire

grounded cord, up to 50 feet or #10/3 wire

grounded cord up to 100 feet. DO NOT EX-

CEED 100 FEET OF EXTENSION CORD. If

distance is greater, purchase and install addi-

tional lengths of airless spray hose.

4. Flip the power switch to the “on” position.

5. Slowly turn the pressure control knob clock-

wise until motor runs.

6. As motor is running with the prime valve

open, the bypass light will be lit to show that

the unit is in prime or “bypass” mode.

7. Allow sufficient time for thinner to circulate

back into the siphon container. It should be

flowing at a constant rate and this may take

seconds to minutes depending on the

viscosity of the paint or flushing fluid.

8. Flip the prime valve lever down to its “closed”

position. The unit should start to build pres-

sure. Check to see if there are any leaks from

any connections. DO NOT attempt to try to

stop any leaks with your hand or with a

rag. If leakage occurs, shut the power switch

to the “off position immediately and flip the

prime valve up to open and release any re-

maining pressure. Tighten and recheck con-

nections on all fittings and repeat from step 1.

If no leaks continue to step 9 on page 7.

Owner’s Manual Page 8 EC621 / EC725

START UP

SPRAY TIP SELECTION

Hero Flip Tips are coded with three (3) numbers.

To determine the fan size:

1. Double the first number (I.E. : 4 x 2 = 8” inch fan width) this is deter-

mined at approximately 12” inches away from the surface.

2. The last two (2) numbers indicate the orifice size in 1/1000 of an inch.

This is very important as it controls the flow, output of the sprayer, and

overall spray quality.

9. The unit should shut off automatically once it reaches its set pres-

sure. At this point keep the pressure set low, between 500 to

1000 psi. The display should now show the pressure and the

spray light should now be lit. This means that the sprayer is under

pressure and ready to spray.

10. Obtain an empty waste container to flush out storage solution.

Unlock gun trigger and trigger into the waste container and

spray until thinner and or paint is flowing out of gun.

11. The storage solution is now flushed from the sprayer and is ready

for spraying. Gun safety trigger should now be locked. If unit has

been flushed previously and paint is ready to spray, then proceed

to step 12. If paint has not been primed though pump then repeat

steps 7 and 8 on set up page and steps 1 to 12 on start up page.

12. Install spray tip into tip guard. If unsure of which spray tip to use,

refer to spray tip selection chart on page 8.

Please read the next following pages for the pressure adjustment,

spray, maintenance, and troubleshooting instructions.

Owner’s Manual Page 9 EC621 / EC725

NOTE: In order to test if a tip is worn, spray a small amount of suitable material on a test surface and

observe the spray pattern produced on the surface. Try to obtain an even elliptical spray pattern by

first adjusting the pressure down, then gradually increasing pressure until full atomization is achieved.

This should result in a crisp spray pattern with sharp edges and even concentration, see diagram

below. If a satisfactory pattern is unattainable ( look for edges to be rounded with heavier

concentration ), then the tip is worn and should be replaced. Other causes of poor spray fan are

insufficient spray pressure and material viscosity ( may requiring thinning ).

Uneven Spray Pattern

Good

Tip Worn

Tip

NOTE: Use of excessively worn tip can result in apparent poor performance of pump.

Different materials require different sizes of tips, and different paint manufactures produce different

qualities of paints. These materials will effect the overall life of the tip. It is very important to choose

and monitor the right spray tip. It is advisable to obtain a spray tip recommendation from the supplier

of the material to be sprayed. The following table is a general guide and will assist in selecting the

optimum tip to use.

TIP SIZE USED TYPICALLY FOR SPRAYING THESE MATE-

RIALS APPROX. GPM Suggested filter (color) Filter Mesh Sizes

.019 Exterior Latex on large unobstructed areas. .47 White or Green Green - 30 Mesh - Extra

Course

.017 Interior Latex, Exterior Latex, Shake Paint, Exterior Flat

Paints. .31 White White - 50 Mesh - Course

.015 Alkyd Flat Enamel, Interior Latex, Semi-Gloss Enamel,

Stains. .23 White or Yellow Yellow - 100 Mesh - Fine

.013 Fine ground Gloss Enamels, and good quality Stains. .18 Yellow Red - 200 Mesh - Extra Fine

.011 Clear Varnishes and Lacquers. .12 Yellow

ORIFICE SIZE

All tips are rated by the size of the orifice or bore size. The bore size is measured in thousandths of an inch

( .017 = 17 thousandths of an inch ). The size of tip required is based on the consistency of the material to

be sprayed. The thicker the paint, the larger the tip size required. Always consult the product label or ask

the paint retailer for the manufacturer's recommendations with regard to proper tip sizes.

FAN WIDTH

Fan width or pattern width is determined by the spray tip's "fan width" classification. This size is measured

in inches, and is determined when spraying 12 inches from the spray surface and the tip of the gun. Vari-

ous methods of noting the fan widths are used by tip manufacturers. Ask your distributor for assistance.

NOTE: Two tips having the same tip size, but different fan widths will deliver the same amount of paint

over a different area (wider or narrower strip).

SPRAY TIP REPLACEMENT

During use, especially with Latex paint, high pressure and material abrasion will cause the orifice to grow

larger. As the orifice grows larger, the fan width grows smaller. Replace tips before they become exces-

sively worn. Worn tips waste paint, cause over spray, and decrease sprayer performance.

NOTE: When using Latex paint, a spray tip will wear at the rate of one size for approximately every 100

gallons of material sprayed.

SPRAY TIP SELECTION – cont.

Owner’s Manual Page 10 EC621 / EC725

AIRLESS SPRAY PAINTING SUGGESTIONS

A good airless spray application is the result of many factors. Surface preparation, which includes cleaning and

degreasing, priming, material compatibility, quality finish product and correct application technique. All are important to

the finished results.

The key to all good applications is a good spray gun technique. Proper application techniques can easily be learned by

using the following simple guidelines. If you are not familiar with the basic spray techniques we recommend that you

study this portion of the manual and practice the techniques shown. Practice your technique on scrap cardboard or old

newspaper until you feel confident.

FOR EXCELLENT RESULTS, READ AND PRACTICE THESE TECHNIQUES

1. Always strain all paint through a H.E.R.O. strainer bag. The most common reason for airless sprayer’s to

malfunction is foreign matter jamming the valves or plugging the tip. Always strain the paint before putting it through

the pump.

2. Always spray at the lowest pressure setting which will provide a uniform spray fan (fig. 1). Adjust pressure

control knob so that paint is completely atomized. Insufficient pressure will result in "tailing". Too much pressure will

result in excess fog and over spray, excess tip wear, and increased sprayer wear and tear.

3. Always spray at right angles to the surface being sprayed (fig. 2). Angling or arcing the nozzle toward the

surface will cause uneven coverage and excessive over spray.

4. Always hold spray gun 11-12 inches from spray surface (fig. 3). Too close and the fan width will be reduced

and material will be applied too heavily which will cause the paint run or sag. Too far from the surface causes

excessive over spray and light coverage (transparent).

5. Always move the gun parallel to the surface being sprayed, at a consistent speed. This avoids uneven

coverage.

6. Always start the spray stroke before triggering the gun and release the trigger before completing the

stroke (fig. 4). This avoids heavy build up of paint at either end of the spray stroke.

7. Always lap your spray pattern by one half (fig. 5). This assures full coverage of the surface being painted.

Poor Good Tailing Good Pattern Fog,

FIG. 1

FIG. 2

Owner’s Manual Page 11 EC621 / EC725

FIG. 3

FIG. 4

FIG. 5

AIRLESS SPRAY PAINTING SUGGESTIONS

When spraying you may encounter a problem with the spray tip plugging up which will either cause

the spray fan to spit, splatter, finger or just shut off completely. The most likely cause is the spray tip

has partially or completely plugged up with foreign debris from the paint.

To fix this problem it is recommended that:

1. The safety lock on the gun trigger should be locked to prevent any mishandling of the gun while

correcting the tip plug. This is done by sliding up the lock tab which is located behind the gun trig-

ger until it is fully engaged and the trigger can no longer be depressed as shown in fig. 6.

2. Twist the spray tip 180° degrees around as shown in fig. 7.

3. The gun should now be triggered away from the spray surface until the spray tip becomes un-

plugged.

4. After the spray tip has been unplugged twist the tip forward 180° degrees.

5. Slide the trigger safety lock down to release the lock to continue spraying.

6. If problem persists check the gun filter and manifold filter and clean or replace if necessary.

FIG. 6 FIG. 7

Owner’s Manual Page 12 EC621 / EC725

PRESSURE RELIEF / SHUT DOWN / CLEANING

When finished spraying or switching to a different

paint, the sprayer will need to be cleaned thor-

oughly. The following steps should help you

through the pressure relief, shut down and/or

cleaning process.

It is very important to read these instructions

as the sprayer will be under high pressure and

if the pressure is not relieved correctly it can

seriously harm or cause injury.

1. Push the gun safety lock up to lock trigger.

This will prevent accidental pulling of the trig-

ger when performing shut down of the

sprayer.

2. Flip the power switch down to the “off” position

to shut power off to the sprayer.

3. Unplug the power cord from the power source.

This should removed by pulling it by the plug

end and not by the cord. This will prevent the

wires in the cord from stretching.

4. Turn the pressure control knob counter clock-

wise to the lowest setting. This will prevent the

sprayer from turning on too soon when the

power is switched on.

5. Obtain a separate waste container and trigger

gun into the container to relieve pressure in

sprayer. This can be done with or without the

spray tip in place.

6. Flip the prime valve up to open and release

any remaining pressure in the sprayer.

7. Place siphon hose assembly into the correct

cleaning solution. If unsure of which solution

to use, refer to the paint manufacturers clean-

ing instructions on the paint container. Hero

Wonder Wash is recommended. This is a

great cleaning solution to clean the pump

when water based paints or stains have been

used.

8. Remove spray tip from gun. This will help to

speed up cleaning the hose and when sprayer

is being cleaned.

Continued on page 12.

Owner’s Manual Page 13 EC621 / EC725

9. Plug the power cord into a 115 volt, 15 amp

grounded circuit. It is very important that

the grounding terminal be place as this will

prevent any static discharge when using hot

solvents.

10. Flip the power switch up to the “on” position.

11. Slowly turn the pressure control knob clock-

wise until motor runs steadily. This will ensure

there is enough rpm for the pump to create suc-

tion.

12. With the prime valve open and the pump

working, the cleaning solution should now start

flowing into the waste container. The bypass

light should be lit to indicate that the sprayer is in

“bypass” mode. This means that the sprayer is

priming.

13. Allow enough time for the cleaning solution to

flow and rinse through the pump section of the

sprayer. This can take several minutes de-

pending on paint or coating in the pump and

siphon hose assembly.

14. Flip prime valve down to close once pump has

had enough time for cleaning solution to rinse

through.

15. Unit should now be building pressure and will

shut off to its setting which is displayed on

digital display. Pressure should be set low,

between 500 to 1000 psi. The spray light

should also be lit on the display which indi-

cates that the sprayer is under pressure and

ready to spray.

16. Unlock gun safety lock on trigger and spray

into a waste container until gun and hose is

thoroughly rinsed with cleaning solution. Lock

gun safety lock on trigger and insert spray tip

back into the tip guard, unlock safety trigger

and trigger once again to clean spray tip.

Once sprayer has been completely rinsed with

cleaning solution, repeat steps 1 to 6 on page

11 to safely relieve pressure from sprayer .

The sprayer’s filters should now be checked,

cleaned or replaced if required. To check the fil-

ters on your sprayer go to page 13.

PRESSURE RELIEF / SHUT DOWN / CLEANING

Owner’s Manual Page 14 EC621 / EC725

FILTER MAINTENANCE

The Hero “EC” series airless sprayers are

equipped with 2 stages of filtration. The first stage

of filtration starts at the siphon hose, which will

help prevent small to large pieces of debris that

would cause damage to the pump, from entering.

The second stage of filtration is an integral filter

manifold. This manifold will help filter out the impu-

rities found in the various paints and coatings. This

second stage of filtration will further filter out these

impurities before reaching the spray gun which will

help the longevity of the spray gun and tip.

Staying on top of proper filter maintenance will

decrease the chance of problems with the pump,

and spray gun and increase the overall longevity of

your sprayer. Both filters are available from your

Hero dealer.

Follow steps 1 to 6 on page 11 to safely

relieve pressure from sprayer before

attempting to check filters.

To check or remove the siphon hose filter, unscrew the filter counter clockwise as shown in

Fig. 1. The filter should be clean and be free of debris, Replace if necessary. It should be

used at all times to prevent unwanted objects from entering and causing damage to the

pump.

To check or remove the manifold filter, unscrew the filter housing counter clockwise as

shown in Fig 2 and Fig 3.

Once the housing has been removed, you will find the filter screen and the filter support

spring. The screen should be cleaned after every use to prevent plugging and or filter col-

lapse. If the filter is not cleanable then it should be replaced.

The standard filter size that comes with your sprayer is “60 mesh” which is good for most wa-

ter and oil based coatings. For higher build paint products, the filter should be changed to a

“30 mesh” filter which would allow the thicker material to more easily flow through the filter.

For fine finish applications when using oil based enamels and lacquers it is recommended

that the filter should be changed to a 100 mesh filter which would better filter out any small

debris before reaching the spray gun and tip. These filters can be ordered through your Hero

dealer.

To reinstall the filter assembly, insert the support spring into the filter screen and insert it into

the pump manifold. Next screw the filter housing clockwise into the pump manifold and hand

tighten until snug.

Owner’s Manual Page 15 EC621 / EC725

DIGITAL DISPLAY DIAGNOSTIC CODES

The Hero “EC” electronic digital display is has a trouble shooting diagnostic program. If you

encounter a problem with the sprayer, read the diagnostic code displayed on your display

and refer to the codes below to determine the problem. If unsure or if you require technical

assistance, call the Hero technical service department for any questions or inquiries.

Error Code Cause Remedy

E001 1. Broken connection on circuit board, can-

not process information.

2. Digital display failure.

1. Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

2. Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E002 1. Broken display connection to circuit

board.

2. Display malfunction.

1. Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

2. Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E003 1. LED malfunction. 1. Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E004 1. Circuit board and circuitry have gotten

too hot. This will occur at 80° Celsius. 1. Make sure that the circuit board is se-

curely fastened to housing in order for

proper cooling to occur.

Check that heat sink compound is in place

to help dissipate heat.

Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E005 1. Not enough memory in the computer to

record and process the running time of

the sprayer.

1. Only occurs when the sprayer has been

run for more than 5000 hours.

If it reoccurs frequently the circuit board

will need to be replaced in order for time

to be stored again.

The pump can still operate but no time will

be counted. The digital display would only

show the pressure.

Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E006 1. Computer is having trouble to save and

process information. 1. This is checked every time the time is

stored, about once every six minutes.

Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

E007 1. Computer malfunction. 1. This should never occur normally.

Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

Owner’s Manual Page 16 EC621 / EC725

Error Code Cause Remedy

E008 1. Pressure transducer failure. 1. Make sure that the sensor is plugged in

and that no wires are broken.

Turn power off to clear error code. If

problem persists, the sensor should be

then replaced.

E009 1. Incoming voltage is too high. 1. This will occur if the incoming voltage

increases to 160 volts AC.

The error code will be cleared once

automatically once the voltage come back

down.

Turn power off to clear error code.

E010 1. Incoming voltage too is low. 1. This will occur if the incoming voltage

drops to 95 volts AC.

The quality, condition, length of the power

cord are extremely important. Heavy

gauge extension cords are always re-

quired for proper and efficient operation of

the electronics on the sprayer.

The error code will be cleared once

automatically once the voltage come back

down.

Turn power off to clear error code.

E011 1. Current draw limit protection has been

reached. 1. This is used to protect the motor windings.

The fuses, circuit breaker, thermal switch,

and the temperature sensor will handle

any long term over-current issues.

EEEE 1. Unknown error has occurred. 1. This should never occur in normal use.

This would imply a malfunction of the

computer itself.

Turn power off to clear error code. If

problem persists, the circuit board may

need to be replaced.

DIGITAL DISPLAY TROUBLE SHOOTING

Owner’s Manual Page 17 EC621 / EC725

PUMP TROUBLESHOOTING

TROUBLE POSSIBLE CAUSE REMEDY

Motor will not

start or run

1. Unit unplugged.

2. Unit not switched “ON”

3. Pressure control knob is set too low.

4. Pump at full pressure.

5. Blown fuses on circuit board.

1. Plug unit in to a 120V, 60HZ,

2. Flip On/Off switch to ON

3. Slowly turn knob until motor runs and follow

start up instructions.

4. Follow “pressure relief instructions”

5. Check and or replace fuses on the circuit

Motor runs but

has poor unit

performance.

1. Stuck ball in pump section.

2. Worn spray tip.

3. Improper tip size.

4. Material too viscous (thick).

1. See fluid section repairs.

2. Replace tip.

3. Check spray tip selection chart.

4. Thin material with appropriate thinners, as per

product manufacturer’s

Low or erratic

output or

pressure

1. Air leaks or blockages.

2. Worn packings, Intake or Outgo

balls and / or seats.

1. Check the following;

►Intake tube fitting.

►Plugged intake screen.

►Intake O-ring.

2. Re-pack pump.

3. Replace piston valve O-Rings.

Unit does not

prime 1. Worn packings.

2. Air leak.

3. Paint level too low.

4. Prime valve plugged.

5. Paint too thick.

1. Re-pack pump.

2. Check the following;

► Intake tube connections.

►Plugged intake screen.

►Intake O-ring.

3. Add paint to pail and re-prime.

4. Disassemble and clean.

5. Thin material with appropriate thinners, per

No output 1. Pump not primed.

2. Pump needs rebuilding.

3. Intake ball stuck to the seat.

1. Prime pump.

2. Rebuild pump.

3. Remove, clean and or replace ball and seat.

Fluid leaks from

front drive

housing.

1. Worn upper packings.

2. Worn piston sleeve and or cylinder.

1. Replace packings with packing kit.

2. Replace if necessary.

Owner’s Manual Page 18 EC621 / EC725

The H.E.R.O. EC units were specifically designed to assist the operator in dealing with the

inconvenient, time consuming, and some times technically challenging concept of equipment service

and repair. The EC models offer simple, quick, easy to perform procedures for all the fluid section

repair procedures. Servicing and the repair of the fluid section can be performed with one simple tool,

the H.E.R.O. “UNI-TOOL™” , ( Part # EC-1000 ). The complete fluid section can be removed and

replaced in about 5 minutes.

REPAIR PROCEDURES

FLUID SECTION

1. Complete “Pressure Relief Procedures” as described on page 4

2. Unplug power cord from electrical source.

3. Remove the siphon assembly (Ref # 1) if a sled or low-boy cart or (Ref #2) if a high boy cart from

intake valve (Ref #24) by pushing the release clip (Ref # 6) over to the side and pulling the siphon

assembly away from the intake valve. NOTE: Bleed hose does not need be removed while

servicing, however you may find it convenient to do so.

4. Using the 1/4” Allan key of your H.E.R.O. Uni-Tool (Part # EC-1000, supplied with each unit),

loosen the four manifold bolts counter clockwise 1/2 a turn as shown in Fig 3.

5. Switch to the 3/8” Allen key and remove the entire Intake valve assembly by turning it counter

clockwise as shown in Fig 4. Continued on page 19.

Tip the entire unit back into a vertical position.

this provides greater access to the fluid section, while making repairs.

EC-2700

EC-1000

Fig 3 Fig 4

Owner’s Manual Page 19 EC621 / EC725

REPAIR PROCEDURES

Fig 5

6. Using the 5/8” socket end, remove the entire pump cartridge assembly by turning it counter

clockwise as shown in Fig 6 until it is fully removed from the connecting rod.

Fig 6

Fig 7

The entire intake section is now removed as shown in

Fig 7, awaiting further repairs or service. Refer to the

various service repairs on the pages to follow. See

below for intake valve disassembly. Pages 20-21 for

piston valve, cylinder, packing kit assembly repairs,

and page 21 for whole piston valve / cylinder / pack-

ing kit assembly replacement and unit re-assembly.

Removal of intake valve

To remove the intake valve assembly follow steps 1 - 5 on page 18.

Once removed from pump manifold, intake valve can now be disassembled. Turn

valve body (Ref # 25) upside down and carefully tap valve onto work surface to

remove components. Inspect all parts for wear or damage.

Assembly of intake valve

1. Install intake crush Washer (Ref # 27) into the Intake Housing (Ref #25).

2. Insert intake seat (Ref # 28) into the intake housing. The intake seat is bev-

eled on both sides, if seat is worn it can then be flipped over and used again.

3. Place the intake ball (Ref # 29) on to the intake seat.

4. Install the Viton (Brown) o-ring (Ref # 26) onto the ball guide (Ref # 30).

5. Lubricate the Viton (Brown) o-ring (Ref # 26) and install ball guide (Ref # 30)

into the intake housing (Ref # 25).

6. Screw the assembled intake valve assembly into the pump manifold.

Simple cleaning and debris removal can be undertaken without dismantling the entire intake

valve

assembly. For component replacement, see disassembly and re-assembly instructions.

INTAKE VALVE ASSEMBLY

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HERO 621H Safety And Operating Manual

Brand: HERO

Model: 621H

Category: Power fine-spray systems

Type: Safety And Operating Manual

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