Scag Power Equipment STHM User manual

Brand: Scag Power Equipment

Model: STHM

Category: Lawnmowers

Type: User manual

This manual is also suitable for

MODEL STHM

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 03047

OPERATOR’S MANUAL

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.

WARNING:

This manual covers the operating instructions

and illustrated parts list for:

STHM - 20CV with a serial number of 3380001-3389999

STHM - 22CV with a serial number of 3390001-3399999

Always use the entire serial number listed on the serial number

tag when referring to this product.

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:

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.

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 7).

2. Check the neutral adjustment. (See Adjust-

ments, page 6)

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 engage-

ment switch is OFF and the parking brake

is ON.

6. Apply lubricant to all the grease fittings. Lubri-

cant was applied at the factory. This is just a

precautionary 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 lifting and pushing

the blade cluch switch into the ON position. Pull

the switch to the OFF position to disengage the

cutter blades.

-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 1/2

throttle, not under full load.

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.

If you are not familiar with the operation of the

hydrostatic drive, practice turning and maneuver-

ing 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.

6. When driving over curbs, disengage the cutter

blades, 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.

PARKING BRAKE

Minor brake adjustments can be made by loosen-

ing 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.

Forward Operation - Depress Toe End of Pedal

Figure 1

Figure 2

Backward (Reverse) Operation - Depress Heel

End of Pedal

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

ADJUSTMENTS

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.

Figure 4. Parking Brake Adjustment

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-

DO NOT OVERTIGHTEN. If you turn the

adjustment bolt too much you will compress the

spring, making too much end play. Go to step 4.

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 adjust-

ment bolt counter-clockwise until the tire rota-

tion stops (See Figure 5).

Figure 5. Neutral Adjustment

Figure 6. Foot Control Pedal Adjustment

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 adjust-

ment, disconnect 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.

SGB028

Adjust

Nuts

SGB029

Neutral Control

Spring

9/16" Socket

SGB030

Jam Nut

Ball Joint

Use of Tension Gauge

sgb007

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.

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).

6. Start the engine. The wheels should rotate only

when the foot control pedal is depressed.

CAUTION:

Figure 7. Cutter Deck Drive Belt Tension

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).

4. Replace the belt covers.

Adjust the tension by tightening or loosening the nut

on the J-bolt.

Figure 8. Blade Drive Belt Tension Check

Figure 9. Blade Belt Tension Adjustment

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.

SGB031

Deck

"J" Bolt

Nut

Washer

Belt

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

mounting bolts to the top of the spindle shaft or to

the bottom of the spindle shaft. All blades should be

positioned equally (See Figure10).

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.

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.

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

Figure 11. Cutter Deck Height Adjustment

SGB032

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

STEERING CABLE ROUTING

When the steering cable is routed between the

front pulley and the rear steering collar, it is very

important that the cable does not rub where it

crosses. The top of the cable end from the front

pulley must go over the top of the lower cable

end (See Figure 14). The cable should be tight-

ened until the slack has been removed. The cable

should not be under tension. Do not overtighten

the adjusting nuts on the rear steering collar

pulley.

Figure 14. Steering Cable

SGB033

Angle Blade Back

Do Not Cut In

X Must NOT Exceed

1/3 Blade Width

SGB034

Front Pulley

Cable Should Not

Touch At Crossover Point

Rear Steering

Collar

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 20 HP Command & 22 HP Command

Models: CV20S, CV22S

Horsepower: 20HP @ 3600 RPM, 22HP @ 3600 RPM

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

Displacement: 20 HP= 624 cc, 22HP = 624 cc

Cylinders: 2 cast-iron sleeves

Governor: Mechanical type governor with variable speed control set

at 3600 rpm (+75 rpm), idle set at 1400 rpm (+75 rpm)

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 with remote oil

filter and 16-inch oil lines, 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: November 30, 1997

Specifications Subject to Change Without Notice

TECHNICAL SPECIFICATIONS (CON'T)

CUTTER DECKS SM 52, SM 61, SM 72

Type: Out-front design with anti-scalp roller and pneumatic shock

absorber for deck flotation

Construction: 10-gauge steel with 7-gauge (3/16") steel skirt

Cutting Width: 52.0 " (132.0 cm), 61.0 " (155.0 cm), 71.5" (181.6 cm)

Cutting Height Adjustment: Adjustable from 1-3/4" to 5-1/4" in 1/4" increments

Cutter Blades: .204 thick, milled edge, 5150 alloy steel

SM52: Three(3) 18" blades

SM61: Three (3) 21" blades

SM72: Three (3) 24" blades

Blade Engagement: Electric blade brake clutch with instrument panel switch

Lift System: Patented manual winch with automatic brake/clutch,

stainless steel cable

Discharge Opening: Extra wide 11.5", 13.75 " discharge opening with hinged

chute

Caster Wheels: 9 x 3.5 smooth tread flotation, inner tubes, split rims, roller

bearings, with quick pin removal

Spindles: Cast housing, taper roller bearing, low maintenance with

top access grease fitting and grease overfill relief poppet

Pulleys: Cast-iron with easily removed taper hubs

Cutter Deck Belts: B-section with Kevlar cord

ADDITIONAL SPECIFICATIONS

Seat: Foam padded, lever adjustment forward and back, with

padded arm rests

OPTIONAL ITEMS/ATTACHMENTS

Grass Catcher: GCV/HD-44/6 Vacuum Grass Catcher with 6 HP engine, 44

gallon capacity, hard plastic cover, mounts on rear bumper

Mulching Kit: Steel plate fits over discharge opening. No blade change

or removal required. Installs and removes in the field.

Electric Deck Lift: Lift mounts to the side of the rider frame assembly to raise

and lower the deck at the flip of a switch. Fits on machines

starting with the 1995 model year.

APPROXIMATE DIMENSIONS SM52 SM61 SM72

Length: 106.0" 110.0" 115.0"

Length with Grass Catcher: 130.0" 134.0" 139.0"

Tracking Width: 50.0" 50.0" 50.0"

Width: 61.0" 70.0" 81.0"

Width (with discharge chute up): 54.0" 63.0" 74.0"

Width with GCV grass catcher: 70.0" 70.0" 84.0"

Height: 43.0" 43.0" 43.0"

Height with GCV grass catcher: 51.5" 51.5" 51.5"

Weight: 910 lbs. 950 lbs. 1000 lbs.

Weight with GCV grass catcher: 1210 lbs. 1250 lbs. 1300 lbs.

Date of Issue: November 30, 1997

Specifications Subject To Change Without Notice

SM-52, SM-61 & SM-72 CUTTER DECK

84 87

75 76

79 75

70 3

155

2 3

17 27 28

10 7

814

107

911

41 30

SGB009A

1 46729 Cutter Deck (Includes decals) x

1 46730 Cutter Deck (Includes decals) x

1 46620 Cutter Deck (Includes decals) x

2 461054 Discharge Chute x

2 461055 Discharge Chute x x

3 04001-09 Bolt, 5/16-18 x 1" Hex Head x x x

4 04021-10 Nut, 5/16-18 Elastic Stop x x x

5 04029-03 Wing Nut, 3/8-16 x x x

6 46804 Belt Cover (Incl. Decals) x

6 46805 Belt Cover (Incl. Decals) x

6 46848 Belt Cover (Incl. Decals x

7 04020-09 Nut, 5/8-11 Hex Head x x x

8 43278 Spacer, Cutter Blade x x x

9 48926 Tapered Hub, 1.125 Bore x x x

10 04001-01 Bolt, 1/4-20 x 3/4 Hex Head x x x

11 48924 Pulley, 5.75 O.D. x

48753 Pulley, 6.35 O.D. x

48967 Pulley, 6.95 O.D. x

12 48923 Pulley, Double Groove, 5.75 O.D. x

48940 Pulley, Double Groove, 6.35/5.75 O.D. x

48966 Pulley, Double Groove, 6.95/5.75 O.D. x

13 48285 Belt, R.H. Blade Drive x

48265 Belt, R.H. Blade Drive x

48295 Belt, R.H. Blade Drive x

14 48530 Belt, Deck Drive x

48912 Belt, Deck Drive x

481001 Belt, Deck Drive x

15 04021-05 Lock Nut,3/8-16 Hex Head x x x

16 04004-14 Stud, 3/8-16 x 6-3/4" x x x

17 04019-04 Nut, 3/8-16 Serr. Flange x x x

18 04001-46 Bolt, 3/8-16 x 2-1/4" x x

19 04041-07 Flatwasher, 3/8 (.391 x .938 x .105) x x

20 48269 Pulley, Belt Guide x x

21 04017-16 Capscrew, 5/16-18 x 3/4 Ser. Flg. HH x x

22 04021-09 Nut, 3/8-16 Elastic Stop x x

23 421355 Idler Pulley Support x x

24 04001-108 Bolt, Hex Head 5/16-18 x 4-1/4" x x x

25 04019-03 Nut, 5/16-18 Ser. Flg. Hex Hd. x x

26 48924 Pulley, 5.75 x x x

27 04019-06 Nut, 1/2-13 Ser. Flg. Hex Hd. x x x

28 04017-37 Capscrew, 1/2-13 x 1-1/4 Ser. Flg. x x x

29 04021-09 Nut, 3/8-16 Elastic Stop x x x

30 04041-07 Flatwasher, 3/8 (.391 x .938 x .105) x x x

31 48181 Pulley x x x

32 04041-12 Flatwasher, 3/8 (.375 x 1.50 x .060) x x x

33 43077 Spacer x x x

34 46081 Idler Arm (Incl. 37 & 38) x x x

35 04001-46 Bolt, 3/8-16 x 2-1/4" x x x

36 45037 Idler Pivot x x x

37 48100-05 Bushing, Bronze Oilite-3/4 ID x x x

38 48114-04 Grease Fitting, Str. 1/4-28 Self Tap. x x x

39 04041-08 Flatwasher, 3/4 ( .776 x 1.25 x .059) x x x

04041-08S Flatwasher, 3/4 ( .776 x 1.25 x .035) x x x

40 04050-02 Retaining Ring, .75 EXT 'E' x x x

41 43028 J-Rod Idler Pulley x x

44078 J-Rod Idler Pulley x

42 04001-10 Bolt, 5/16-18 x 1-1/4"Hex Head x x x

43 04019-03 Nut, 5/16-18 Ser. Flange x x x

44 04001-77 Bolt, 3/8-16 x 3-1/2" Hex Head x x x

45 48269 Pulley, Deck Drive Idler x x x

46 04050-05 Retaining Ring, 1-1/8 EXT 'E' x x x

47 48100-02 Bushing, Bronze Oilite- 1-1/8 ID x x x

48 45329 Idler Pivot Support x x x

SM-52, SM-61, & SM-72 CUTTER DECK

49 43277 Spacer x x x

50 46748 Idler Arm (Incl. 38 & 47) x x x

51 44078 J-Rod, Drive Idler x x x

52 481050 Spring, Chute Return x x x

53 46631 Spindle Assembly x x x

54 43298 Shaft, Cutter Spindle x x x

55 481024 Seal, 2.00 O.D. x 1.50 Bore x x x

56 481022 Bearing Assembly x x x

57 48098 Shield, Spindle x x x

58 48677 Relief Fitting, Cutter Spindle x x x

59 43294 Spindle Housing x x x

60 43312 Spacer, Outside x x x

61 43296 Spacer, Inside x x x

62 481025 Seal, 2.00 O.D. x 1-5/8 Bore x x x

63 43297 Spindle Bushing Bottom x x x

64 481035 Nut, 1-1/16-18 UNEF-2B x x x

65 04001-41 Bolt, 5/8-11 x 9-1/2" x x x

66 04040-10 Flatwasher, 5/8 (.688 x 1.75 x .134) x x x

67 48108 Cutter Blade, 18" Standard x

48185 Cutter Blade, 18" Hi-Lift x

48111 Cutter Blade, 21" Standard x

48304 Cutter Blade, 21" Hi-Lift x

48112 Cutter Blade, 24" Standard x

68 04063-08 Key, 1/4 x 1/4 x 2" x x x

69 04066-01 Quick Pin x x x

70 45944 Shaft, Roller x x x

71 48038 Guide, Roller x x x

72 48307 Wheel Assy., Caster x x x

73 48307-02 Tire Only, Caster Wheel x x x

48006-03 Inner Tube Only, Caster Wheel x x x

74 48307-04 Rim Pair, Caster Wheel x x x

75 48006-07 Retainer, Caster Wheel x x x

76 48114-03 Grease Fitting, 45 Deg. 1/4-28 x x x

77 48006-05 Hub Assy. W/Bolts, Caster Wheel x x x

78 48307-08 Tapered Hex Nut, 5/16-18 x x x

79 48006-06 Roller Bearing, Caster Wheel x x x

80 46079 Caster Wheel Assembly x x x

81 04001-37 Bolt, 1/2-13 x 5-1/2" Hex Head x x x

82 04021-07 Nut, 1/2-13 Elastic Stop x x x

83 43022 Sleeve, Caster Wheel Bearing x x x

84 45006 Caster Yoke x x x

85 43037-01 Spacer, Caster Yoke 1/2" x x x

86 48100-01 Bushing, 7/8 x 1" Flanged x x x

87 46082 Support Assembly x x x

Ref. Part

No. No. Description 52 61 72

Ref. Part

No. No. Description 5261 72

ENGINE DECK

22 24

28 31

75 57

102

16 83

16 16

1995

12 93

1697

SGB010A

101

100

101

103

104

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Scag Power Equipment STHM User manual

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Model: STHM

Category: Lawnmowers

Type: User manual

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