Scag Power Equipment STHM Three-Wheel Rider User manual

Brand: Scag Power Equipment

Model: STHM Three-Wheel Rider

Type: User manual

MODEL STHM

OPERATOR’S MANUAL

THIS MANUAL CONTAINS THE OPERATING

INSTRUCTIONS AND SAFETY INFORMA-

TION FOR YOUR SCAG MOWER. READING

THIS MANUAL CAN PROVIDE YOU WITH

ASSISTANCE IN MAINTENANCE AND AD-

JUSTMENT PROCEDURES TO KEEP YOUR

MOWER PERFORMING TO MAXIMUM EFFI-

CIENCY. THE SPECIFIC MODELS THAT THIS

BOOK COVERS ARE CONTAINED ON THE

INSIDE COVER. BEFORE OPERATING YOUR

MACHINE, PLEASE READ ALL THE INFOR-

MATION ENCLOSED.

PART NUMBER 03088

FAILURE TO FOLLOW SAFE OPERATING PRACTICES

MAY RESULT IN SERIOUS INJURY.

* Keep all shields in place, especially the grass discharge chute.

* Before performing any maintenance or service, stop the machine and

remove the spark plug wire and ignition key.

* If a mechanism becomes clogged, stop the engine before cleaning.

* Keep hands, feet and clothing away from power-driven parts.

* Read this manual completely as well as other manuals that came

with your mower.

* Keep others off the tractor (only one person at a time)

REMEMBER - YOUR MOWER IS ONLY AS SAFE AS THE OPERATOR!

Hazard control and accident prevention are dependent upon the awareness,

concern, prudence, and proper training of the personnel involved in the

operation, transport, maintenance, and storage of the equipment.

This manual covers the operating instructions

and illustrated parts list for:

STHM-23CV with a serial number of 6400001 to 6409999

SM-61A with a serial number of 6410001 to 6419999

SM-72A with a serial number of 7130001 to 7139999

Always use the entire serial number listed on the serial number

tag when referring to this product.

WARNING:

TABLE OF CONTENTS

MODEL STHM

SUBJECT PAGE

Introduction.................................................................................................. 1

General Safety Instructions.......................................................................... 1

Signal Words ............................................................................................... 1

Symbols....................................................................................................... 2-3

Before Operating ......................................................................................... 4

While Operating........................................................................................... 4-5

Maintenance and Storage ........................................................................... 5-6

Initial Run-In Procedures ............................................................................. 6

Mower Operation ......................................................................................... 6-7

Parking Brake Adjustments ......................................................................... 8

Neutral Adjustment ...................................................................................... 8-9

Belt Tension................................................................................................. 9-10

Belt Alignment ............................................................................................. 10

Cutter Deck Adjustments ............................................................................. 10-11

Cutter Blades............................................................................................... 11

Lubrication and Maintenance ...................................................................... 12

Troubleshooting Cutting Conditions ............................................................ 13-15

Technical Specifications.............................................................................. 16-17

WE SUPPORT OPE

TECHNICIAN

CERTIFICATION

Equipment & Engine

Training Council

MEMBER

TABLE OF CONTENTS

(CONTINUED)

SUBJECT PAGE

Illustrated Parts List

SM 61, 61A, 72 Cutter Deck...................................................................... 18-19

Engine Deck ..................................................................................... 20-21

Upper Hydraulics.............................................................................. 22-23

Lower Hydraulics........................................................................................ 24-25

Control Linkage.......................................................................................... 26-27

Instrument Panel ............................................................................... 28-29

Rider Frame Assembly ..................................................................... 30-31

Brake Linkage................................................................................... 32-33

Eletrical System................................................................................ 34

Winch Lift System ............................................................................. 35-36

Replacement Decals ........................................................................ 37

Warranty Statement........................................................ Inside Back Cover

SIGNAL WORDS

This symbol means Attention! Become Alert!

Your Safety is Involved!". The symbol is used

with the following signal words to attract your

attention to safety messages found on the decals and

throughout this manual. The message that follows

the symbol contains important information about

safety. To avoid injury and possible death, carefully

read the message! Be sure to fully understand the

causes of possible injury or death.

Signal Word:

It is a distinctive word on safety decals and through-

out this manual that alerts the viewer to the exist-

ence and relative degree of the hazard.

The signal word DANGER denotes that an ex-

tremely hazardous situation exists on or near the

machine that could result in high probability of

death or irreparable injury if proper precautions are

not taken.

The signal word WARNING denotes that a hazard

exists on or near the machine that can result in

injury or death if proper precautions are not taken.

The signal word CAUTION is a reminder of

safety practices on or near the machine that could

result in personal injury if proper precautions are not

taken.

INTRODUCTION

Your mower was built to the highest standards in the

industry. However, the prolonged life and maximum

efficiency of your mower depends on you following

the operating, maintenance and adjustment instruc-

tions in this manual.

We encourage you to contact your dealer for repairs.

All Scag dealers are informed of the latest methods

to service this equipment and provide prompt and

efficient service in the field or at their service shop.

They carry a full line of Scag service parts.

A replacement Operator's Manual is available from

your Scag Servicing Dealer or by contacting Scag

Power Equipment, Service Department at P.O. Box

152, Mayville, WI 53050. Please indicate the com-

plete model and serial number of your Scag product.

USE OF OTHER THAN ORIGINAL SCAG

REPLACEMENT PARTS WILL VOID THE

WARRANTY.

The Right and Left, Front and Rear of the

machine are referenced from the operators perspec-

tive when in the normal operating position and

facing the forward travel direction.

GENERAL SAFETY INSTRUCTIONS

READ THIS OPERATOR'S MANUAL and all

instructions furnished with attachments.

Perform only those maintenance procedures de-

scribed in this manual. If major repairs are ever

needed or assistance is desired, contact an Author-

ized Scag Dealer. To ensure optimum performance

and safety, always purchase genuine SCAG replace-

ment parts and accessories.

Your safety and the safety of others depends signifi-

cantly upon your knowledge and understanding of

all correct operating practices and procedures of this

machine.

WARNING:

CAUTION:

CE Mark

Transmission

Choke

On/Start Spring Tension on Idler

Oil

Off/Stop

SYMBOL DESCRIPTION

ISO Symbols

Spinning Blade

48071S

Parking Brake

WARNING

FALLING HAZARD

USE ONLY SCAG APPROVED

RIDING ATTACHMENTS

SEE OPERATOR'S MANUAL

481109

Falling Hazard

Slow

Fast

Cutting Element - Engage

Cutting Element - Basic symbol

Cutting Element - Disengage

Continuously Variable - Linear

Keep Bystanders Away

Pinch Point

481039S

SYMBOL DESCRIPTION SYMBOL DESCRIPTION

Hourmeter/Elapsed Operating Hours

Thown Object Hazard Read Operator's Manual

BEFORE OPERATING

1. Know the operating controls and how to stop

quickly.

2. Do not allow children to operate the machine.

Do not allow adults to operate the machine

without proper instruction.

3. Remove all debris or other objects that might be

picked up and thrown by the cutter blades. Keep

all bystanders away from the mowing area.

4. Keep all shields, safety devices, and decals in

place. If a shield, safety device or decal is defec-

tive or damaged, repair or replace it before

operating. Also, check all nuts, bolts and screws

for proper tightness, to assure the machine is in

safe operating condition.

5. Do not operate the machine while wearing

sandals, tennis shoes, sneakers or shorts. Also,

do not wear loose fitting clothing which could get

caught in moving parts. Always wear long pants

and substantial shoes. Wearing safety glasses and

safety shoes is advisable and required by some

local ordinances and insurance regulations.

6. Fill the fuel tank with clean, fresh gasoline, with a

minimum octane rating of 87. Avoid spilling

gasoline. Gasoline is highly flammable, handle it

carefully.

A. Use an approved gasoline container.

B. Do not fill the tank while the engine is hot or

running.

C. Do not smoke while handling gasoline.

D. Fill the fuel tank outdoors and up to approxi-

mately 1" (25 mm) below the bottom of the

filler neck.

E. Wipe up any spilled gasoline.

7. Before attempting to start the engine, move the

blade engagement switch to the OFF position and

apply the parking brake.

WHILE OPERATING

1. Start the engine when the cutter blades are

disengaged, the parking brake is on and the right

foot pedal is in the neutral position.

2. Do not run the engine in a confined area without

adequate ventilation. Exhaust fumes are hazard-

ous and could possibly be deadly.

3. Using the machine demands attention. To

prevent loss of control:

A. Mow only in daylight or when there is good

artificial light.

B. Watch for holes or other hidden hazards.

C. Do not drive close to a drop-off, ditch, creek

bank, or other hazard.

D. Reduce speed when making sharp turns and

when turning on hillsides.

E. Do not operate where conditions are slippery.

4. The discharge chute must always be installed and

in the down position on the side discharge cutter

deck except when the Scag optional grass

catcher or mulching plate are properly installed.

If the discharge area should plug, shut the engine

off and wait for all movement to stop before

removing the obstruction.

5. Disengage the blades and wait for them to stop

before crossing gravel drives, walks or roads.

6. Shut the engine off and wait until the blades

come to a complete stop before removing the

grass catcher container.

7. Never raise the cutter deck while the blades are

rotating.

8. Always park the mower and/or start the engine

on a level surface. Apply the parking brake to

prevent the mower from moving when you are

not in the operators position.

13. Do not pass or stand on the grass discharge side

of any mower with the engine running. Stop the

cutter blades when another person approaches.

Battery posts, terminals, and related accessories

contain lead and lead compounds, chemicals

known to the State of California to cause cancer

and reproductive harm. Wash hands after han-

dling.

9. If the cutting blades should strike a solid object

or the equipment should start to vibrate abnor-

mally, stop the engine, disconnect the spark plug

wire, and check immediately for the cause.

Vibration is generally a warning of trouble.

Check the machine for damaged or defective

parts. Repair any damage before starting the

engine or operating the cutter deck. Be sure the

blades are in good condition and the blade bolts

are tight.

10. Reduce speed and exercise extreme caution on

slopes and in sharp turns to prevent tipping or

loss of control. Be especially cautious when

changing directions on slopes.

DO NOT operate on steep slopes. To check a

slope, attempt to back up it (with the cutter deck

down). If the machine can back up the slope

without the wheels slipping, reduce speed and

use extreme caution. ALWAYS FOLLOW OSHA

APPROVED OPERATION.

11. Do not touch the engine or muffler while the

engine is running or soon after it is stopped.

These areas could be hot enough to cause a burn.

12. Before leaving the operators position or leaving

the mower unattended, move the right foot pedal

into the neutral position, apply the parking brake,

and move the blade engagement switch to OFF.

Shut the engine OFF and remove the key.

MAINTENANCE AND STORAGE

1. Disconnect the spark plug wire from the spark

plug to prevent accidental starting of the engine

when servicing, adjusting or storing the machine.

2. If the mower must be tipped to perform mainte-

nance or adjustment, remove the battery, drain

the gasoline from the fuel tank and the oil from

the crankcase.

3. To reduce potential fire hazard, keep the engine

free of excessive grease, grass, leaves and accu-

mulations of dirt.

4. Be sure the machine is in safe operating condition

by keeping nuts, bolts, and screws tight. Check

the blade mounting bolts and nuts frequently to

be sure they are tightened.

5. If the engine must be running to perform a

maintenance adjustment, keep hands, feet, cloth-

ing and other parts of the body away from the

cutter deck blades and other moving parts.

6. Do not overspeed the engine by changing gover-

nor settings. To be sure of safety and accuracy,

have an authorized dealer check maximum engine

speed with a tachometer.

7. The engine must be shut off before checking the

oil or adding oil to the crankcase.

8. Allow the engine to cool before storing the

mower in any enclosure such as a garage or

storage shed. Make sure the fuel tank is empty if

the machine is to be stored in excess of 30 days.

Do not store the mower near any open flame or

where gasoline fumes may be ignited by a spark.

WARNING:

9. Always store gasoline in a safety-approved, red

container.

10. Be careful when servicing the battery as it con-

tains acid, which is corrosive and could cause

burns to skin and clothing.

11. Batteries release explosive gases when being

charged or discharged. Keep batteries away from

any source of sparks and/or flame.

12. Make sure all hydraulic connections are tight and

all hydraulic hoses and lines are in good condi-

tion before starting the machine.

13. Hydraulic fluid is under high pressure. If you

need service on your hydraulic system, please see

your authorized Scag dealer.

INITIAL RUN-IN PROCEDURES

(FIRST DAY OF USE OR APPROXI-

MATELY 10 HOURS)

1. Check the belts for proper tension at 2, 4 and 8

hours. Adjust as needed. (See Belt Tension,

page 9).

2. Check the neutral adjustment. (See Adjust-

ments, page 8)

3. Check the tires for proper pressure.

Caster Wheels 25 psi

Drive Wheels 15 psi

Rear Steering Wheel 15 psi

4. Check for loose hardware. Tighten as needed.

5. Check the safety switches for proper adjustment:

* The engine should crank and start if the

machine is in neutral, the PTO engagement

switch is OFF and the parking brake is ON.

7. Apply lubricant to all the grease fittings. Lubricant

was applied at the factory. This is just a precaution-

ary check to make sure that all the fittings have been

lubricated.

MOWER OPERATION

-NOTE-

Use gasoline with an octane rating no less than

87.

* The right hand foot pedal must be in the

NEUTRAL position.

* The blade clutch switch must be in the OFF

position.

* The parking brake must be ON.

3. Start the engine:

* Choke as required. If the engine is cold, pull

the choke knob out. When the engine starts,

slowly push the choke in. If the engine stalls,

repeat the above operation. When the engine

is warm, choking may not be necessary.

4. Depress the left hand operator presence pedal.

5. Engage the cutter blades by pulling the blade clutch

switch into the ON position. Push the switch to the

OFF position to disengage the cutter blades.

1. Read and understand the safety instructions

before attempting to operate this machine.

2. Before starting the engine:

* Check the oil level in the engine and the

hydraulic reservoir.

* Fill the fuel tank with clean, fresh, lead-free

gasoline.

* Open the fuel valve on the bottom of the

fuel tank.

390S0138

PULL UP TO ENGAGE

PUSH DOWN TO DISENGAGE

-NOTE-

When the PTO is engaged or (possibly) disen-

gaged, a squealing sound from the underside of

the machine is normal. It is caused by the

electric clutch plates meshing as the cutter

blades come up to speed. For best equipment

life, engage the clutch with the engine at 3/4

throttle, not under full load.

If you are not familiar with the operation of the

hydrostatic drive, practice turning and

maneuvering before engaging the cutter blades.

5. Release the parking brake. Depress the right foot

pedal at the toe end to drive forward (See Figure 1)

or depress the pedal at the heel end to drive in

reverse. (See Figure 2)

-NOTE-

The left hand operator presence pedal must be

depressed for operation.

Forward Operation - Depress Toe End of Pedal

Figure 1

Figure 2

6. When driving over curbs, disengage the cutter blades

and raise the cutter deck to clear the curb. Drive

forward over the curb. After the curb is clear, lower

the cutter deck back to normal operating position.

Be sure to leave slack in the cable after lowering the

cutter deck.

7. To "freewheel" or move the machine around without

the engine running, rotate the dump valve lever

located on the left rear of the engine deck to the

freewheel position (See Figure 3). The lever must be

returned to the drive position to operate the machine.

Figure 3. Dump Valve Location

WARNING:

SGB003

DUMP VALVE

FREE

WHEEL DRIVE

SGB006

sgb002

-NOTE-

To prevent damage to the hydraulic system, do not

exceed 1MPH when moving the machine in the

freewheel postion.

Backward (Reverse) Operation - Depress Heel

End of Pedal

ADJUSTMENTS

PARKING BRAKE

Minor brake adjustments can be made by loosening

the top nut on both brake cables (see Figure 4).

Back the nuts off approximately 1/4". While pulling

one cable downward, tighten the bottom nut on the

cable until it touches the bottom of the brake cable

mount. Tighten both the top and bottom nuts to

lock the cable in place. Repeat the above steps for

the second brake cable. Make sure that both

cables are adjusted evenly so that the brakes do not

cause the mower to pull to the left or right.

-NOTE-

This is a minor brake adjustment. If the

brakes do not function properly after this

adjustment, see your Scag Service Dealer

before operating your mower.

NEUTRAL ADJUSTMENT

1. Set the engine deck up on jack stands so the wheels

are free to rotate.

2. Block the caster wheels to prevent an accident

should the machine fall off the jack stands.

3. Start the engine and determine if the drive wheels

rotate.

If the drive wheels consistently rotate when foot

pedal control is in neutral, go to step 4.

If the drive wheels inconsistently rotate, i.e. drive

wheels sometimes rotate and sometimes do not

when foot pedal is not depressed, then check

neutral adjustment bolt for "zero free play" in neutral

control spring.

-NOTE-

If there is free play in the foot pedal have your

SCAG servicing dealer inspect the machine

and repair it as needed.

4. If the drive wheels rotate in the forward travel

direction, turn the adjustment bolt clockwise until the

tire rotation stops. If the drive wheels rotate in the

backward travel direction, turn the adjustment bolt

counter-clockwise until the tire rotation stops (See

Figure 5).

Figure 5. Neutral Adjustment

SGB029

Neutral Control

Spring

9/16" Socket

Figure 4. Parking Brake Adjustment

SGB028

Adjust

Nuts

Use of Tension Gauge sgb007

5. Check the adjustment of the right foot control pedal

for full forward speed. The pedal should rest on the

foot plate when the pump is stroked in the full

forward position. To make an adjustment, discon-

nect the ball joint from the pedal arm and loosen the

jam nut (See Figure 6). Place the foot control pedal

forward against the foot rest and adjust the ball joint

on the rod until the stud aligns with the hole in the

arm. Bolt the ball joint to the arm and tighten the

jam nut.

6. Start the engine. The wheels should rotate only

when the foot control pedal is depressed.

BELT TENSION

Stop engine and remove the key from the ignition

before making any adjustments. Wait for all

moving parts to come to a complete stop before

beginning work.

-NOTE-

The Hydro Drive Belt is spring-loaded and

does not require adjustment.

To adjust cutter deck drive and blade belts:

1. Remove belt cover.

CAUTION:

Figure 7. Cutter Deck Drive Belt Tension

Figure 6. Foot Control Pedal Adjustment

SGB030

Jam Nut

Ball Joint

Figure 8. Blade Drive Belt Tension Check

3. To adjust blade drive belt: Using a belt tension

gauge, check the belt tension so that the belt moves

1/2" with 10 pounds of pressure. (See Figure 8).

Nut

"J" Bolt Belt

End Of L-Shaped

Bracket

Washer

SGB044

2. To adjust cutter deck drive belt: Adjust the nut so

that the belt moves 1/2" with 10 pounds of pres-

sure. (See Figure 7).

Adjust the tension by tightening or loosening

the nut on the J-bolt.

4. Replace the belt covers.

BELT ALIGNMENT

Belt alignment is important for proper performance of

your Scag mower. If you experience frequent belt wear

or breakage, see your authorized Scag Service Dealer

for belt adjustment.

CUTTER DECK ADJUSTMENTS

Due to the many conditions that exist, it is difficult to

suggest a setting that will work for every lawn. There

are, however, two adjustments that should be made on

the cutter deck: pitch and height.

PITCH is the angle of the blades (comparing front

to rear).

HEIGHT is the nominal distance that the blade is

off the ground. This measurement is made with the

blades pointed side to side and distance is measured

between cutting tip and ground.

Adjusting the blade height can be done by moving any

number of the five smaller spacers on the blade mount-

ing bolts to the top or to the bottom of the spindle shaft.

All blades should be positioned equally (See Figure 10).

The unit is shipped with one spacer on top of spindle

and four underneath (See Figure 10).

This adjustment does not affect blade pitch.

-NOTE-

For best results, keep the cutter deck

high in relation to the engine deck and

the blades low in the cutter deck; ie. 4 or

5 spacers below the spindle shaft.

Additional range to the cutting height can be

achieved by repositioning the cutter deck in relation-

ship to the engine deck. This adjustment also affects

the pitch of the deck.

Figure 9. Blade Belt Tension Adjustment

SGB031

Deck

"J" Bolt

Nut

Washer

Belt

Hex Nut-Torque

to 75 Lb-Ft Cutter Blade

Spacer 1/4"

Spindle

Shaft Cutter

Deck

Spindle

Assembly Hex Head

Bolt / Nut

Cutter Blade

Spacers1/4"

Washer

Hex Head Bolt Cutter Blade

Figure 10. Cutter Blade Adjustment

There are three positions for mounting the cutter deck

(See Figure 11). For cutting in the lowest position,

mount the cutter deck in the top hole (A). For cutting in

the highest position, mount the deck in the lowest hole

(C). Setting the cutter deck height will be determined

by the type of cutting conditions.

Caster spacers also can be repositioned to change the

cutting heights and to change the pitch of the deck (See

Figure 12).

To adjust the caster spacers, raise the deck and remove

the pin and caster wheel. Reposition the caster spacers

as needed, then replace the caster, top spacers and pin.

Make the same adjustments on the other caster wheel.

To adjust the blade height, move any number of the five

1/4" thick spacers on the blade mounting bolts to the

top of the spindle shaft or below the spindle shaft.

Figure 11. Cutter Deck Height Adjustment

Figure 12. Repositioning Spacers

CUTTER BLADES

Do not sharpen beyond 1/3 of the width of the blade. (See

Figure 13).

-NOTE-

Dress the blade with a file. Using a wheel grinder may

burn the blade. Check the balance of the blade. If

blades are out of balance, vibration and premature

wear can occur. See your authorized Scag Dealer for

blade balance tools.

Blades have a sharp cutting edge. Wear protective

gloves or wrap blades with protective material when

removing, sharpening and installing blades.

CAUTION:

Figure 13. Blade Sharpening

SGB032

SGB033

Angle Blade Back

Do Not Cut In

X Must NOT Exceed

1/3 Blade Width

Spacers

SGB005

8 Hours (Daily)

25 Hours

40 Hours (Weekly)

100 Hours (Biweekly)

200 Hours (Monthly)

500 Hours or Annually

COMMENTS

Add oil as needed - SAE 10W30

Do not over fill

MORE OFTEN IF NEEDED

US Lithium MP White Grease 2125+

MORE OFTEN IF NEEDED

Add or adjust as required

Distilled water only

Chassis grease

See engine mfg. information

Chassis Grease

US Lithium MP White Grease 2125+

Use SAE 10W30 motor oil

Clean area before removing filter

LUBRICATION & MAINTENANCE

* Lubrication may be required every 8 to 40 hours, depending on climate and environment.

+ Compatible Greases: Mobilux #2 found at Mobil Service Stations

Ronex MP found at Exxon Service Stations

Super Lube MEP #2 & Super Stay-M #2 found at Conoco Service Stations

Shell Alvania #2 found at Shell Service Stations

Lidok EP #2 found at industrial shops

1. Perform these maintenance procedures more frequently under extreme dusty or dirty conditions.

Break-In

(1st 10 Hours)

PROCEDURE

Check all hardware for proper tightness

Change engine oil and filter at 5 hours

Check hydrostatic oil level

Check belt tension

Fill fuel tank before starting

Check engine oil

Clean blower screen

Remove debris from under belt cover

Sharpen cutter blades

Grease spindle bearings 2 pumps of hand gun

Clean air filter/check for damage or loose parts

Check/clean air intake and cooling areas1

Check tire pressure

Service precleaner element1

Check battery electrolyte level

Grease caster wheel bearings

Grease caster wheel pivots

Grease idler arm pivots

Service air cleaner element1

Change engine oil

Check spark plug condition and gap

Clean cooling areas1

Check all hardware for proper tightness

Change engine oil filter

Check hydro fluid reservoir level

Clean and adjust spark plugs

Grease rider frame pivot

Grease control bell cranks

Grease steering handle bearing

Grease foot pedal bearings

Grease rear wheel pivot (vertical)

Grease rear wheel bearing

Drain hydraulic system and replace fluid

Change hydrostatic oil filter

Stringers - Occasional Low engine RPM Run engine at full 3600 RPM

Blades of Uncut

Grass Ground speed too fast Slow speed to adjust for conditions

Wet grass Cut grass after it has dried out

Dull blades, incorrect sharpening Sharpen blades

Deck plugged, grass accumulation Clean underside of deck

Belts slipping Adjust belt tensions

Streaking - Strips of Dull, worn blades Sharpen blades

Uncut Grass in Cutting

Path Incorrect blade sharpening Sharpen blades

Low engine RPM Run engine at full 3600 RPM

Belt slipping Adjust belt tension

Deck plugged, grass accumulation Clean underside of deck

Ground speed too fast Slow speed to adjust for conditions

Wet grass Cut grass after it has dried out

Bent blades Replace blades

Width of Deck

SGB018

CONDITION CAUSE CURE

Width of Deck

SGB020

Width

Deck

Width

Deck

SGB019

Streaking - Strips of Not enough overlapping Increase the overlap of each

Uncut Grass Between between rows pass

Cutting Paths

TROUBLESHOOTING CUTTING CONDITIONS

CONDITION

TROUBLESHOOTING

CAUSE CURE

Sloping Ridge Across Tire pressures not equal Check and adjust tire pressure

Width of Cutting Path Wheels uneven Check and adjust tire pressure

Deck mounted incorrectly See your authorized SCAG dealer

Uneven Cut on Flat Lift worn off of blade Replace blade

Ground - Wavy

High-Low Blade upside down Mount with cutting edge toward

Appearance, ground

Scalloped Cut, or

Rough Contour Deck plugged,grass accumulation Clean underside of deck

Too much blade angle (deck pitch) Adjust pitch and level

Deck mounted improperly See your authorized SCAG dealer

Bent spindle area See your authorized SCAG dealer

Dull blade Sharpen blade

Uneven Cut on Uneven ground May need to reduce ground speed,

Uneven Ground - raise cutting height, and/or change

Wavy Appearance, direction of cut

High-Low Scalloped

Cut, or Rough Contour

Width of Deck

SGB020

Width of Deck

SGB021

Width of Deck

SGB023

Scalping - Blades Low tire pressures Check and adjust pressures

Hitting Dirt or

Cutting Very Close to Ground speed too fast Slow speed to adjust for conditions

the Ground Cutting too low May need to reduce ground speed,

raise cutting height, change direction

of cut, and/or change pitch and level

Rough terrain May need to reduce ground speed,

raise cutting height, and/or change

direction of cut

Ground speed too fast Slow speed to adjust for conditions

Wet grass Cut grass after it has dried out

Step Cut Blades not mounted evenly Adjust pitch and level

Ridge in Center of

Cutting Path Bent blade Replace blade

Internal spindle failure See your authorized SCAG dealer

Mounting of spindle incorrect See your authorized SCAG dealer

Slope Cut - Sloping Bent spindle mounting area See your authorized SCAG dealer

Ridges Across Width

of Cutting Path Internal spindle failure See your authorized SCAG dealer

Bent deck housing See your authorized SCAG dealer

TROUBLESHOOTING

CONDITION CAUSE CURE

Width of Deck

SGB024

Width of Deck

SGB025

Width of Deck

SGB022

TECHNICAL SPECIFICATIONS

ENGINES

General Type: Heavy duty industrial/commercial

Brand: Kohler 23 HP Pro Series (Spec PS-75523)

Models: CV23S

Horsepower: 23HP @ 3600 RPM

Type: 4 cycle gas, twin cylinder, vertical shaft engine

Displacement: 23HP = 674 cc

Cylinders: 2 cast-iron sleeves

Governor: Mechanical type governor with variable speed control set

at 3600 rpm (+50 rpm), idle set at 1900 rpm (+100rpm)

Air Intake Group: Large capacity dual element, chopper-type grass screen

Exhaust Group: Single exhaust canister muffler

Fuel Pump Group: Mechanical fuel pump with inline fuel filter, fixed jet

carburetor with Smart-Choke™ and fuel shutown solenoid

Oil Pump Group: Positive displacement Gerotor™ oil pump.Capacity 2.0 U.S.

Quarts with filter, standard oil cooler.

Valve Group: Hydraulic valve lifters standard

Starter/Electrical: 12 volt battery with alternator, solid state ignition with key

start

Charging System: 15 amp

ENGINE DECK

Fuel Tank: 5 gallon (19.0 litres) seamless polyethylene

Drive Wheels/Tires: 20x10.0-10 four-ply pneumatic tubeless, radius edge

Brakes: Integral braking with drive system

Parking Brake: Drum-type

Frame: Hybrid tractor trailer frame with stabilized pivot

DRIVE SYSTEM

Type: Hydro drive with one variable displacement pump and two

cast-iron high torque motors

Hydro Pump: #15 cast-iron variable displacement pump with remote dump

valve for movement without running engine

Drive Wheel Motors: 12 cu. inch cast-iron high torque motors

Dump Valve: Single lever allows for movement without engine running

Hydro Fluid Cooling Group: Heavy-duty cooling radiator, 13 qt. capacity nylon cooling

reservoir, uses, SAE 10W30 fluid and 10 micron filter

Travel Control: Hydro drive with single foot pedal for forward and reverse

speed control, infinitely variable speeds

Steering: Aircraft-type yoke steering handle with stainless steel cable

Axles: 1-1/4" tapered motor shafts

Safety Group: Foot actuated engine kill, brake interlock, blade/clutch

interlock switch

Instrument Panel: Ammeter, hour meter, key switch, throttle, fuses, manual

choke, blade brake clutch switch

Forward Speed Range: 0 to 6.8 mph

Reverse Speed Range: 0 to 5.4 mph

Date of Issue: Sept. 1, 2000

Specifications Subject to Change Without Notice

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Scag Power Equipment STHM Three-Wheel Rider User manual

Brand: Scag Power Equipment

Model: STHM Three-Wheel Rider

Type: User manual

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Scag Power Equipment STHM Three-Wheel Rider User manual

Scag Power Equipment STHM Three-Wheel Rider User manual

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