Case 80 Operator's Manual

A

This

Safety
Safety Messages In This
See

This Symbol Carefully Read The Message
That Follows and Be
Of Personal

Alert

Injury

Symbol Indicates

Manual

Alert

Or

Death

To The Possibility

Important

When

You

IF THIS MACHINE IS
LOANED

THAT

1.

IS INSTRUCTED IN

2.

REVIEWS

OR RENTED, MAKE ABSOLUTELY CERTAIN

THE

PERTAINING TO THE MACHINE.

OPERATOR(S),

AND UNDERSTANDS THE MANUAL(S)

USED

PRIOR

SAFE

BY AN EMi

TO OPERATING:

AND

PROPER

LOYEE

USE.

OR IS

75 1253

^WARNING

BEFORE

STUDY OPERATOR'S

READ

CLEAR

STARTING ENGINE

MANUAL

ALL

SAFETY

THE AREA OF OTHER PERSONS

SIGNS ON

SAFETY

MACHINE

MESSAGES

LEARN

CONTROLS

II IS VOUR

ON

MACHINE

Ol'E

HAT OH AND

& PRACTICE

BEFORE

HLbP()Ni,IBIll|v

OPERATION,

SERVICE

lO UNDERSFANDAND FOLLOW MANUFACTURER'S INSTRUCTIONS

SERVICE.

MANUALS MAY Bt OH'AINEO FROM YOUR EQUIPMENT DEALER

AND lO ObSERVE PERTINENT LAWS AND REGULATIONS

SAFE

USE OF

OPERATING

TABLE

OF CONTENTS

SAFETY

INTRODUCTION 2

SERIAL

OVERALL

GENERAL

ENGINE

FUEL

LUBRICATION

OPERATING

RULES

NUMBER 4

SPECIFICATIONS 7

SPECIFICATIONS

Lubrication Chart 11
Engine

Operating Controls 13-15
Pre-Starting Check
Run

In Procedure > -. 15
Mounting
Starting Procedure 16
Stopping the Engine 17

Lawn

Mowing

II -

MEASUREMENTS 5

SPECIFICATIONS

10-12

Lubrication 12

INSTRUCTIONS 13-19

List

and Dismounting the Riding Lawn

18-19

6

8-9

15

Mower

15

XIII

PREVENTIVE

Engine

Air Deaner 21
Cleaning
Carburetor Adjustment 22

Engine

Spark
Toe In Adjustment 25
Battery and Battery Charger

Traction Drive Maintenance 30-32

Adjusting The Clutch Link 31
Friction Drive Wheel Replacement 30

Drive Belt Replacement 32
Mower
Mower

Wiring Diagram 39
Storing the Riding Lawn

ATTACHMENTS

MAINTENANCE AND ADJUSTMENTS

Maintenance 21-24

Engine Cooling Air Intake Screen 21

Lubrication {See LUBRICATION) 12

Plug 24

26-29

Drive Belt Service 34
Deck Service

35-38

Mower

40-41

43

20-40

SAFETY

The twenty-three safety messages which follow are provided by the American National
Standards Institute * (ANSI). Safety rules to supplement those provided by ANSI also
appear on the following pages.

Study these rules carefully before starting and operating your Case Riding Lawn Mower.

* Rule Number 10 has been modified for greater safety and rjle number 24, which does

not apply to this product, has been omitted.

MESSAGES

A

A

A

A.

A

CAUTION;
THE OWNER'S MANUAL

CAUTION:
allow adults to operate it without proper instruction.

CAUTION:
safe distance away.

CAUTION:
up and thrown.

CAUTION:
tral before attempting to start the engine (motor).

Know the conlrols and how to stop quickly. READ

Do not allow children to operate the vehicle. Do not

Do not carry passengers. Keep children and pets a

Clear the work area of objects which might he picked

Disengage all attachment clutches .'ind shift into

neu-

CAUTION:
gine (motor) before leaving the operator's [position.

Disengage power to attachment(s) uuzi stop the en-

A

- II •

CAUTION:

gine (motor) before making any repairs or adjustments.

Disengage power to attachmentis) and stop the en-

A

A

A

A

CAUTION:
or not in use.

CAUTION:
unattended, such as disengaging the power take-off. lowering the at­tachment(s), shifting into neutral, setting the parking brake, stop­ping the engine, and removing the key.

CAUTION:
downhill.
face,

CAUTION:
vent tipping or loss of control. Exercise extreme caution when
changing direction on slopes.

CAUTION:

Disengage power to attachment(s) when transporting

Take atl possible precautions when leaving the vehicle

Do not stop or start suddenly when going uphill or

Mow down the face of steep slopes; never across or up the

Reduce speed on the slopes and in sharp turns to pre-

Stay alert for holes m the terrain and other hidden

CAUTION:
miMit.

Use care when pulling loads or using heavy equip-

a. Use only approved rlrawbar hitch poirtt.

b. Limit loads to those you can safely control.

c. Do not turn sharply. Use care when backing.

d.

Use counterweightlsl or wheel weights when suggested in

the oi/vner's manua}.

- Ill -

CAUTION:

Watch out ftir traffic when crossing ot near roaflways.

^^^P^^^k

CAUTION:
of mateiial toward bystanders nor allow anyone iiyar the vehicle

while in operation.

CAUTION:

CAUTION:

condition,

When using any attachments, never riiiect ciischarge

Handle gasoline wilh car(? - il is highly flammable,

a. Use a|)proved gasoline cofitainer.

\).

Never rnniove the cap of the fuel tank oi add gasoline to a

rLinning oi hot engine, nr fill the fuel tank indoors. Wi[)e up
spillfMJ gasoline.

c. Oiien dtjors if the enijine is run in the cjarage exhaust

fumes are danger oris. Do not run the' enjitir^ (motor) in­door s.

Keep the vehicle and attachments in good operating

anil keep safety devices in [ilace.

A
A

CAUTION:
I'quipment is in srde working condition.

CAUTION:
inside a Liuilding where fumes may reach an open flame or spa'k. Al­low

CAUTION:

leavers, or excessive gnjasc

Keep all nuts, bolts, and scievvs tight to be sure the

Never store the eijuiijment with gasolme in the tank

thi.*

engine to cool bi.dure storing in any enclosuri'.

To reduce fire hazard, keefi the engine free of grass,

- IV-

A

CAUTION:
inspected
should

be

T|-ie

for

repaired liefore restarting

vehicle

and

atlachments should

damage after striking a foreign object,

and

o[)eratin']

be

stopped

and the

the

equiiament.

and

damage

CAUTION:
speed

CAUTION:
lows:

Remember, a careful 0[)erator

accident. Give complete

Do not

the

engine.

When using

(1)

Mow

{2}

Nevei make a cutting height adjustment vwhile

gine (motor)
to

do so.

(3)

Shut

calclier

(4)

Check

frequent intervals.

chantje

oiily

in

davhght

is

the

engine (motor)

or

unclogging ohutt;.

the

blade moimting holts

and

the

engine governor settings

the

vehicle with movve-r, proceed

or in

good artificial light.

running

if the

operator must dismount

off

when removing

for

is

always

the

hesi insuratK:e against

undivided attention

pioper tightness

to the jol.) at

or

as

the en-

the

hand.

over-

fol-

grass

at

an

CAUTION:
Lirake,

f

OI

CAUTION:

v-ni iniuiy.

A

Always

and

wait until

e disinoLin h ng

On y

shu I of f engine, i

all

engine

and

ti

oin tl"ie

O(T'(

,I

opf?ratf' roiui

mowe'r motion

toi's

s(?at.

(jls

from tfit-^ np

eniove

key, set

has

stopped

I.M

,IIOI'^

5eal

[jatk

tn [ iic

i nr.

he-

CAUTION:

Do not smoke when woi king neai fu(^

A

A

CAUTION:
moved as described in the "Storage" section of this manual before

standing mower on end for stoiage or service.

CAUTION:
always back up onto the trailer and drive off of trailer.

CAUTION:
SVIV safety emblem foi warning to the operators of other vehicles.
Check local government regulations.

WARNING: Be sure that the mower drii/e levei is off, the engine is
shut off, the key removed and the blade has stopped spinning before
attempting to clean a pluggetl discharge chute.

Be sure gasoiine is thoroughly drained and battery re-

If necessary to move riding lawn mower on a trailer,

Highway tiavel should be avoided. If necessary, use

A

Become thoroughly familiar with all riding lawn moviyer controls be­fore operating.

Be ccitain whoever operates the mower has read and understands
the safety rules in this manual.

DANGER:
hands
high speed spinning mower blade can

Spinning Blade. Keep clear. Contact can injure. Keep

and

feet

away

from

mower discharge opening. Contact

cause

severe injury.

with

the

A

A

A

A

CAUTION:

mature wear and failure of bearings and spindle. If the blade cannot
be balanced by resharpening, replace it with a new one.

CAUTION:

shut off engine, allow engine to cool, remove key and spark plug
wire f)efore making adjustments to or serv cing the Riding Lawn

Mower.

WARNING: Rotating Fan, Contact with rotating engine flywheel
fins can injure. Keep clear. Do not allow anything to snter engine
cooling air intake duct while engine is running. This duct is exposed
only when the engine enclosure is raised. Avoid running engine with
enclosure raised.

CAUTION:
all of the exposed metal parts are "live". Never lay a metal object
across
lighted matches and exposed flames must be kept away
battery
liquid in the batteries is
clothing.

An unbalanced blade is hazardous and vj\\\e pre-

IVlove attachment drive clutch lever in OFF position,

When working around storage batteries, remember

the terminals as a spark or short circuit may result.

due to the presence of explosive gas in the battery. The

acid.

Use care not to spill it on hands or

Sparks,

from

that

the

POISON:
burns.
EXTERNAL,
of water or milk. Follow

A

vegetable oil.
for 15 minutes and get
reach

Batteries contain sulfuric acid which can

Avoid contact

flush

with

Call

physician immediately;

of children.

cause

severe

with

skin,

eyes

or clothing. Antidote:

water; INTERNAL, drink large quantities

with

milk

of magnesia, beaten egg or

prompt

EYES,

medical attention. Keep out of

flush

with

water

A

DANGER: Batteries produce explosive charges. Keep sparks, flame
and cigarettes away. Ventilate when charging or using in enclosed
space. Always shield eyes when workmg near batteries.

A

CAUTION:
with the tractor electrical system or battery as you may ground a
live circuit.

WARNING: To jump start this mtichine:

1.

Place travel control lever in neutral, set parking biake, and [ikice

2.

Raise eniime enrdosnie anrl prop o(.)en with SLjppoit i od.

3. Connect i.u)sitive (Red) (') jumper cable

4.

Connect othet enr tjf [positive (Red! ( + i lumper cai)le (o tfu;

5. Connect negative iBlack] (-) lumpei c.iljle to negative (-) terminal

6. Connect othei end of nerjative (Black) [-1 jumper t-iible to Ihf: on-

Never wear rings or metal watch hands when working

movvei

(Invfj

levet m OFF.

T(J

batteiy tei mmal nii

stai ter solenoid.

tive (0 leiminal post of the nooster battery.

o! boost',') haHeiy.

gme lilock. Avoid connection neai \u>-\, cat Inn-j tui and bat-

tel y.

posi-

7. Stand on left side of machine and stai t using ignition key switch,

8. Disconnect jumper <;at-iles in the ieven,e oitlei, that is, iL^move the
ne(jarii.'e (Black) (-) raljle fitst. Keeji ends fiorn lonchmg to pit;
vent spiirks.

CAUTION:
completi:

Diive al a sneed slow enough to insure safety and

contiol at ail iimf,

-VIM -

CAUTION;

Do not

v.Tat Inos.-: cluThinq which

m.ry

catch

in

CAUTION;

WARNING:

,vVjVvig,-S.
[ii.'i

-^(.ins
(Migini'
viC'Hq,

•.

I J I k 1 J ti d f ( 11 • I

SI-I

••.'lilt;,

II,li-

m.i:' l)f

1. Keep all shields in place.

B.dm.'

R'M'! ;l

L^jr i| & [); jr I n ••

dnd vvj. I tui ,i

01

iii.ikii'i"!

.It'll 1 I

ohl.i

2.

Before leaving operator's position:

a. Shift transmission to neutral

b. Set parking brake

c. Disengage attachment clutch

d.

Shut off engine

e. Remove ignition key

3, Wait for all movement to stop before servicing ma-

chine.

4,

Keep people and pets a safe distance away from

machine.

^•,^l^lllq t'liqn:-'

•.,!!>•:•,

11

jiiy

i'l|iisi

n ni. j I

I I

>l IS' •!

VH p' 1 ;

ri'd

Pnin

,ll,l>hilu.

:>,iif

nicvMiUM

nil • •!'i It '. ynjt : i'',[)uiiS!liil, ty 'o

11 I f

II

viui i u liJine il t

Mudy

ofH''atoi's manuul

O-ul r>i

nl rm

i; ui '-inn hd "t e d •sniou n

II , r • • • '

llrM '

11;

,

111

oK

Indoi

c n|)ci .j

•• I r I 11 t i (ii r, (ill in ,(rh

11 K I I -'

11U

1,1 ' ;

(lejli'i.

()

11S

O p'' I ,

sa'i-*ty

,,d',M

11

nq,

11

nq,

ntul-^'

St oi)

Sft

111' • i •'t

(11) I f 7 U I*

J,!'

<''

1.

CAUTION;
chute guard must be m place before you operate the mower.

Either the entire grass catcher or the mower discharge

A

-

IX-

A

A

CAUTION:
justing carburetor.

WARNING: Improper operation of your riding lawn mower on hill­sides and slopes can be dangerous. Avoid improper operation!

Read and follow the instructions given in the section titled "Hill-

side Operation" in this manual before operating your tractor.

Avoid contacting hot exhaust pipe when you are ad-

DANGER:
or

grass

IMPORTANT: Always install new

Flying debris. Operate mower only

catcher.

are destroyed, lost, painted over or illegible. When

individual parts are replaced
tached,

be

sure

to install a new decal
part. Replacement
Case

dealer.

decals

whenever the old

decals

are available

that

with

chute extension

decals

have

decals

with

the new

from

at-

your

- X-

HILLSIDE

(SLOPE)

OPERATIOM

WARNING: Improper operation of your riding lawn mower on
sides and slopes can be dangerous. Avoid improper operation!

Read and follow the instructions given in the section titled

A

Avoid operating riding lawn mower on hillsides and slopes. To minimize the possibility
of accidents while operating on hills and/or rough terrain, obey a combination of rules,
practices and good common sense.

These include:

1.

Reading, understanding, and obeying all written safety messages appearing on decals

on the machine and in operator's manuals,

2.

Learning from your operator's manual and carefully from EXPERIENCE how to op-

erate your riding lawn mower correctly. Know your riding lawn mower's limitations.

3. Knowing the terrain on which you are operating your riding lawn mower. There are

terrain conditions on which your riding lawn mower cannot be operated!

4.

Learning to expect changes in operating conditions. Adding or removing attachments

or weight to your ridmg lawn mower will make your riding lawn mower perform

ferently. Rain, snow, loose gravel, wet grass, etc., change the tractive conditions of the

terrain requiring changes in your operating technique or not to operate on that ter­rain.

side Operation" in this manual before operating your tractor.

hill-

"Hitl-

dif-

The following paragraphs will cover these practices one at a time. Read and study

them.

The examples provided are not all inclusive but will give you a firm understanding

of the requirements for avoiding accidents while operating your riding lawn mower.

Case Riding Lawn Mowers are designed and built to comply with the Voluntary

Standard ANSI B71.1 - 1972 and B71.1a - 1974 (American National Standards Institute).

The diagram depicts the maximum

angles that the stationary riding lawn

mower, less mounted equipment, was

subjected to without tipping, measured

on a perfectly flat, smooth, and hard sur-

face.

This illustration does not recommend safe operating limits as the slope, type of ter­rain and all applicable factors as discussed in this manual must be taken into considera­tion by any person whenever operating the riding lawn mower.

THE OPERATOR IS THE SOLE JUDGE AS TO THE DEGREE OF SLOPE ON
WHICH THIS RIDING LAWN MOWER CAN BE SAFELY OPERATED. IF IN DOUBT
THAT THIS RIDING LAWN MOWER CAN BE SAFELY OPERATED ON A PARTICU-

LAR SLOPE, DO NOT OPERATE ON THAT SLOPE! COMMON SENSE MUST PRE-

VAIL

Read.

Understand. Obgy:

Safety messages are found on the riding lawn mower and in the operator's manuals.
These must be understood by the riding lawn mower operator to be of value. Be sure that
these messages are studied before starting and/or operating the riding lawn mower by an
operator not familiar with this particular riding lawn mower.

Learn

to Operate:

Learn your riding lawn mower controls from decals on the riding lawn mower and

from instructions in the operator's manual. Practice how to properly manipulate these

controls. Practice must be done in a flat area, clear of obstacles and bystanders. Learn
your riding lawn mowers operating characteristics and limitations. These include:

a. amount of engine power available

b. engine governor response

c. tractive ability

d.

steering characteristics

e. braking characteristics

f. movement of travel lever

g.

forward and reverse ground speeds

h. speed of attachment lift

i. and others

Attempting any operation which approaches or exceeds the riding lawn mower's

tation is risking an accident.

Know

the Terrain:

Know the terrain on which you are working. Find hidden obstacles by walking
through and inspecting the area prior to operating your riding lawn mower on it. Mark
obstacles, such as, rocks, ruts or holes with a 6 ft long pole and red flag and stay well
clear of these obstacles when operating.

Operate your riding lawn mower at a ground speed slow enough to insure complete
control at all times.

Regulate the travel control lever slowly and smoothly to maintain this safe speed.

Always drive in a forward direction when proceeding downhill. Never drive up a

If necessary, back up a hill to the desired position. Always back up loading ramps and tilt

bed trailers. If necessary to turn while on a

hill,

always turn downward.

limi-

hill,

- XM -

Your judgement, based on operating experience is the final word in deciding if you
should negotiate any given hill or slope. If you are in doubt about safety, STAY OFF
THE SLOPE.

Under no circumstances should an inexperienced operator attempt to use your riding

lawn mower on slopes or hillsides.

You may encounter some terrain on which your riding lawn mower cannot be opera-

ted even if a different piece of equipment has operated there in the past.

Learn

to Compensate for

Adding or removing attachments (such as bagging attachment) change the weight and
weight distribution of your riding lawn mower and, therefore, change your riding lawn
mower's operating characteristics.

Be alert to these changes. Practice operating the riding lawn mower after each change
has been made.

Adding an attachment (weight) to the rear of the riding lawn mower reduces the
weight on the front axle.

Tractive conditions will vary with weather and terrain and equipment.

Areas wet with dew or rain will be more slippery than when dry. Areas covered with

loose gravel are more slippery than firm dry ground. Greater stopping distances are re­quired in these slippery areas.

Changes

in Operating Conditions:

Spinning rear wheels tend to move the riding lawn mower sideways.

The final word in safe riding lawn mower operation rests on your judgement.

If in doubt of your safety, STAY OFF THE SLOPE.

-

XIII

-

TO

THE

PURCHASER

The care you give your new Case Riding Lawn Mower will greatly determine the satis­faction and service life you will obtain from it. Use this manual as your guide. By obser­ving the instructions and suggestions in this manual, your Case Riding Lawn Mower will
serve you well for many years.

As an Authorized Case Dealer, we stock Genuine Case Parts, which are manufactured
with the same precision and skills as the original equipment. Our factory trained staff is
kept well informed on the best methods of servicing Case equipment and is ready and
able to help you.

Should you require additional aid or information, contact us.

OF A

CASE

NOTICE

RIDING LAWN MOWER

Laws of some states or provinces may require that this unit be equipped with a SPARK
ARRESTOR OR SPARK ARRESTING MUFFLER, The State of California, as an
example, is one state which has such regulations for agricultural and forestry applications,
plus a regulation for construction applications in forest-covered, brush-covered, or
grass-covered lands.

Typically such laws and regulations require spark arresting devices to be maintained in
good working order and typically to be attached to the exhaust system of naturally
aspirated engines (engines without a turbo charger).

CANADIAN RADIO

The Canadian Government, under authority granted by the Radio Act, has promulgated

regulations covering this gasoline powered Case Riding Lawn Mower if imported into

Canada on or after September 1, 1976.

The spark plug(s) in this machine when replaced must have a resistor type spark plug
installed.

The certification label applied to the engine must not be removed or obliterated.

3-80-SL-800 U. S. Price $1.40 PRINTED IN

INTERFERENCE

•2-

REGULATIONS

U.S.A.

FIGURE 1

Left View Model 80 Riding Lawn Mower

FIGURE 2

Right View Model 80 Riding Lawn Mower

-3-

\

r

SERIAL

When ordering parts from your Authorized Case Dealer and in all contacts or corres­pondence with your dealer relative to the Riding Lawn Mower always specify the Serial
and Model Number of both the Riding Lawn Mower and the Engine.

The Riding Lawn Mower Model and Product Identification Numbers are stamped on
the number plate located on the Frame Side panel, Figure 3. The Engine, Model, Serial
and Engine Specification Numbers are stamped on a plate fastened to the top center of
engine shroud.

NUMBER

FIGURE 3

For reference, fill in Product Identification Number, Model Number and Engine Num-

ber of your Riding Lawn Mower in the spaces provided below.

Riding Lawn Mower Model Number 80

Riding Lavi/n Mower

Product Identification Number .

Engine Model Number l^QZilS

Engine Specification Number

NOTE:

The terms "Right Hand," "Left Hand," "Front" and "Rear" whenever used in

this manual apply to the Riding Lawn Mower when facing in the direction it will

move in forward operation.

-4-

C

OVERALL

MEASUREMENTS

FIGURE 4

A Overall Length 61" (1540 mm)

B Wheel Base 47" {1200mm)

C Overall Height 36" (920 mm)

D Minimum Ground Clearance With Mower Fully Raised 2" (50 mm)

Rear WheelTread 22-3/4" (580 mm)

Front Wheel Tread 23-7/8" (610 mm)
Overall Width With Discharge Chute 41-1/2" (1060 mm)

Shipping Weight 340lbs. (154 Kg)

GENERAL SPECIFICATIONS

ELECTRICAL

Battery
Starter
Battery Charger

CLUTCH BRAKE

TRANSMISSION

Speed Range - - Forward

SYSTEM

Friction drive clutch-brake

Reverse .

12 Volt 12 Amp Hour

12 Volt Bendix Drive

Input: 120v AC, 60 Hz, 25 Watts

Output: 12v DC, 1 Amp DC

For Use Indoors Only

mechanically operated

with park lock.

Friction drive

0-5.5MPH(0-8.8Km/hr)

2 MPH (3.2 Km/hr)

TIRES TIRE SIZE

Front 11x4-5 2 High Flotation *8 PSI (55 kPa)

Rear 16 x 6.50-8 2 High Flotation 8 PSI (55 kPa)

* Early production without bead-lock rims inflate to 18 PSI (110 kPa)

MOWER

Type Singlespindle rotary mower

Size .30 inch (760 mm)

PLY

TYPE PRESSURE

ENGINE

GENERAL

Type 079301 - Briggs & Stratton - Vertical Crankshaft

Model 190705
Cycte 4
Cylinders 1
Cylinder Bore 3" (80 mm)
Stroke 2-3/4" (70 mm)
Piston Displacement 19.44 cu. in. (320 cc)
Horsepower 8 H.P. (5.9 kw) @ 3600 R.P.M.
Compression Ratio 6,2 to 1

Full Load Speed 3500 R.P.M.
No Load Speed 3600 R.P.M.
Idle Speed 1750 R.P.M.
Valve Clearance-Cold (Intake) 006" (0.15 mm)
Valve Clearance-Cold (Exhaust) 010" (0.25 mm) Rotator Keeper

Torque (Ft. Lbs.) 12.7 Ft. Lbs. (17.2 Nm)

PISTON AND CONNECTING ROD

Piston Chrome Plated
Compression Rings 2
Oil Rings 1
Connecting Rod Aluminum Alloy

SPECIFICATIONS

(9)

2500 R.P.M.

FUEL SYSTEM

Carburetor Large, One Piece, Flo-Jet

Fuel Strainer In Tank Outlet Fitting

Fuel Tank Capacity 6.7 Pints (3.2 I)

IGNITION SYSTEM

Breaker Point Gap .020" (9.51 mm)

Magneto Armature Air Gap .012" (0.30 mm)

Spark Plug Prestolite 14L7 or equivalent

(Prestolite 14RL7 or equivalent in Canada)

Thread 14 MM

Gap 030" (0,76 mm)

Plug Wrench Size 3/4" (19 mm) Deep-Well Socket

COOLING SYSTEM

Flywheel Blower Forced air inside baffles

directing air around finned

cylinder and head area

FUEL

SPECIFICATIONS

CARBURETION ON SMALL GASOLINE ENGINES IS ALWAYS CRITICAL OF
DIRT. IT IS RECOMMENDED THAT A FILTERING FUEL FUNNEL ALWAYS BE
USED ALONG WITH CLEAN GASOLINE.

AT ANY EVIDENCE OF FUEL STARVATION, CLEAN THE FILTER IN THE

TANK OUTLET FITTING.

DO NOT MIX OIL WITH GASOLINE FOR THIS ENGINE.

CAUTION:
inside a building where fumes may reach an open flame or spark. Al­low the engine to cool before storing in any enclosure.

Never store the equipment with gasoline in the tank

FIGURE 5

GASOLINE

The typical Octane number ratings for regular grade gasoline (March 1967).

Motor Method 86.2 Octane Number
Research Method 94.2 Octane Number

Average 90.2 Octane Number

These two Octane ratings are used to define the anti-knock quality of gasoline. It
has become common practice in the Petroleum Industry to refer only to the RESEARCH
METHOD RATING although in the United States the average of the two figures is posted
on gasoline pumps.

When only one Octane rating is given for gasoline and the rating method is not
specified,
Method Rating elsewhere in the World.

GRADE gasoline having a minimum research method rating of 90.7 Octane. This will give
full power and economy together with long engine life and low maintenance cost.

Case Riding Lawn Mowers provided the Average Octane Rating in the United States and

the Research Method Octane Rating elsewhere in the World is 90 or higher.

it can be assumed to be the average rating in the United States or the Research

Engines used in Case Riding Lawn Mowers are designed to operate on REGULAR

Non-leaded gas is a suitable alternative for use in all 4-cycle air cooled engines used on

CAUTION:

Hanfllc gasoline with car.' it is highly flammable.

a. Use approved gasoline cotitainer.

b.

Never remove the cap of the fuel tank or add gasoline to a

running or hot engine, or fill the fuel tank indoors. Wirie up
spilled gasoline.

c. 0[)en doors if the engine is run in the garage — exhaust

fumes aie dangerous. Do not run the eng ne' (motor) in­doors.

LUBE CHART

SERVICE POINTS

Anti-Scalping Wheels
Engine Cooling Air Intake Screen
Engine Oil
Front Spindles (king pins)

Air Cleaner

Air Leaks

Battery

_8

Chain and Chain Bracket Pivot

Drive Belts

10

Engine Oil

11

Front Wheel Bearings

12

Mower Drive Clutch

13

Mower Height Adjust Lever Pivot Points

14

Rear Axle Bearinas

15

Steering Column

16

Travel Control

17

19

Clutch Brake Linkage
Spark Plug°

20

Steering Gear

21

Throttle and Choke Control

22

Transmission Pivot Support Plate

23

FREQUENCY

HOURS

OR

MONTHLY

Engine Cooling Fins

25

Spark Plug

26

Always check engine oil level before each use of Riding Mower. Keep oil level to

the full mark on the dip stick. See page 12 for engine lubrication recommendations.

'* Be sure there are no leaks between gaskets, joints at carburetor, air cleaner and

cylinder block.

More often in dusty conditions. Remove shroud to clean,

o Clean and regap.

Use number 1 gun grease (Lithium Base) for atl pressure fittings (as many strokes

as required).

HOURS OR

YEARLY

- n -

ENGINE

It is extremely important that you select and use in your Case Riding Lawn Mower

Engine a detergent type, high quality, SD or SC API Service Classification Oil.

Always check engine oil level before each use of Riding Lawn Mower or every 5 hours

of operation, whichever occurs first .

OIL SAE VISCOSITY RATING

Air Temperatures

SAE

30 40°F {2°C)

and Above

SAE

5W-20 or 5W-30

between

and 0°F (-18°C)

LUBRICATION

SELECTION OF OIL

40°F (2°C)

SAE low or

diluted 10% with Kerosene

hours of operation thereafter. Check oil level daily and keep level to the full mark on the

dip stick.

carry away a greater amount of contaminant when hot.

ating temperature) - the crankcase should be drained more often to prevent the formation
of sludge or harmful deposits in the engine.

10W-30

Drain and refill the crankcase after the first 5 hours of operation, and every 25

If possible, run engine just prior to changing oil -- the oil will flow more freely and

If the engine service is severe - {frequent stopping and starting, high or low oper-

Below 0°F (-18°C)

OIL CHANGE

CAUTION;
gine (motor) before making any repairs or adjustments.

Disengage power to atlachment(s) and stop the en-

A

IMPORTANT: 1. When the crankcase is drained, refill with 2-1/4 measured pints

(1.0 1} of oil.

2.

Operate the engine for a few minutes, allow sufficient time for the

oil to run down off the engine parts. Then check the oil level with
the dipstick.

3. This will prevent overfilling or underfilling the crankcase, either of
which can be detrimental to the engine service life and will give you

false oil consumption records.

- 12-

OPERATING

INSTRUCTIONS

OPERATING

IMPORTANT: This Riding Lawn

SWITCHES.

A.

Lawn Mowers prior to S/N

The engine cannot be started unless the travel control lever is in neu-

tral

and the mower drive lever* is in the "OFF" position.

B.

Lawn Mowers S/N

The engine cannot be started unless the clutch-brake pedal is de-

pressed

and the mower drive lever" is in the "OFF" position. Re-

lease

pedal slowly after engine starts.

* The engine may not start when the mower is In the lowest cutting

position.

"OFF"

1. IGNITION KEY AND
starter engages to start the engine. When stopping the engine, turn the key to the
left

"Off" position. Be sure the mower drive lever. Reference 7 is in the "Off" posi-

tion

and travel control lever. Reference 5, is in "Neutral" before starting or stop-

ping the engine.

2. CHOKE AND THROTTLE - When starting a cold engine, position the lever all the
way to the "Choke" position.
after the engine begins to run. Choking may not be necessary when restarting a
warm engine. Start

you how much choking is necessary for different starting conditions.

Raise

the mower or pull the mower drive lever toward the

position to allow the engine to start

STARTER

Move

with

the lever in the "Slow" position. Experience will soon

CONTROLS

Mower

9746098

is equipped

9746098

and after

SWITCH - Turn key all the way to the right until

the lever

from

with

NEUTRAL START

the choke position immediately

tell

FIGURE

-13-

8

3.

CLUTCH-BRAKE

the first "part of its travel disengages the traction drive. Depressing it further en­gages

the brake.

PEDAL-

Depressing the combination clutch-brake pedal through

4. PARKING
to hold the brake in the engaged position when parking the tractor.

5.

TRAVEL

done without use of the clutch-brake pedal. Smoother starts may be obtained by
slowly
ward or reverse. Preventing jerky starts will eliminate shock loads and possible dam­age to the drive train.

If desired to start motion using the clutch-brake pedal, position the travel control
lever
speed

A

third method for smooth starts is to place the engine

then advance the

Maximum
not move as far in the reverse arc of travel as in the forward arc of travel. The travel
control lever must be held in the reverse position.

6. MOWER ADJUST
a

range of five height selections. Pull handle out to disengage pin
move to the cutting height desired. Release handle to allow pin to engage selected
hole.

7. MOWER DRIVE
the

mower.

BRAKE - Raise

CONTROL

and gradually moving the travel control lever

in the

SLOWEST

slowly using the travel lever only. {There is only a single reverse speed.)

throttle

reverse speed is

LEVER

LEVER

full

ON position. Pull the lever rearward to the OFF position to stop the

the lock lever while the clutch-brake pedal is depressed

LEVER

- Shifting

position, release the pedal slowly and then increase forward

after drive engagement.

less

than forward, therefore, the travel control lever will

- This lever is used to raise and lower the mower through

- To engage the mower, slowly push this lever forward to

from

neutral to forward and reverse can be

from

neutral into either

throttle

at 1/2 speed and

from

for-

hole, then

IMPORTANT: To increase drive belt life, engage attachment Drive Lever at slow engine

speed and also before encountering heavy grass.

8. SEAT ADJUSTMENT - Three sets of mounting holes are provided in the seat sup­port. Select the seat position which gives the maximum comfort with your hands

holding the steering wheel and your feet on the foot rests. To change position lift
the engine enclosure and remove the four capscrews, relocate seat and reinstall cap­screws and lockwashers.

PRE-STARTING

Before starting your new Case Riding Lawn Mower for the first time and before each

operating period thereafter, check the following.

L Make sure everyone responsible for tfie mower's operation and maintenance under-

stands the importance of clean

2.

Check that all lubricating fittings are serviced as directed in the Lubrication Chart.

3. Check engine oil level and add as necessary.

4.

Be sure that air cleaner, and blower air intake screen on engine are free of obstruc-

tions and excessive dirt.

5. Check that the fuel tank is filled with clean fuel that meets requirements listed

under Fuel Specifications. Always wipe fuel tank cap clean before removing it. Be
sure vent hole in fuel tank cap is open.

6. Check all operating controls for proper function.

Become Thoroughly fdmiliai with all iiding lawn mowei control'". i)e­f oi e 0[iei aling.

fuel,

CHECK

oils, containers and funnels.

LIST

A

RUN IN

Your new Riding Lawn Mower should be subjected to a run in period before it is op­erated at full
the travel control lever through its full range of forward travel and reverse during the run
in period,

Mount the mower from the left side, starting with your left foot on the left foot rest,

your left hand on steering wheel and right hand on seat back. Then swing your right foot

through between steering wheel and seat.

Dismount using the reverse of the above procedure.

load.

Drive it for approximately an hour to get the feel of operation. Shift

MOUNTING

AND DIS-MOUNTING THE RIDING LAWN MOWER

PROCEDURE

- 15-

STARTrNG

1. For Lawn Mowers prior to S/N 9746098, place the travel control lever in neutral
and the mower drive lever in the "OFF" position.

For

Lawn Mowers S/N

brake pedal and place the mower drive lever in the "OFF" position.

9746098

PROCEDURE

and after, place in neutral, depress the clutch-

*The engine may not start when the mower is in the lowest cutting position.
the mower or pull the mower drive lever toward the "OFF" position to allow the
engine to start.

2. Position the Choke Throttle Lever all the way to the "Choke" position if the engine
is

cold. If engine is warm, leave the lever set at the "Slow" position. Experience will

quickly

tell

you which lever setting to use under various temperature conditions.

Raise

FIGURE

-16-

10

3.

Turn the Ignition Key all the way to the right to start the engine.

IMPORTANT: In the event of a "false start," that is, if the engine gets up

sufficient speed to disengage the starter but fails to continue
running,
halt before a restart attempt is made. If the flywheel is still
rotating when the switch is engaged, the flywheel and starter
gears will clash and could be damaged.

Cranking time must be limited to 30 seconds followed by a
60 second cooling period to prevent overheating of the starting
motor. If an engine fails to start after this length of time,
ignition or carburetion troubles are indicated and should be

corrected before the engine is placed in operation.

4.

After the engine starts and runs, move the lever out of the choke position.

IMPORTANT: Do not attempt to start mower by pushing or towing as serious damage

to the drive system may result.

5. Always allow the engine to "warm-up" for a few minutes before operating under
load.

the engine must be allowed to come to a complete

CAUTION:
tral before attempting to start the engine (motor).

WARNING: Improper operation of your riding lawn mower on
sides and slopes can be dangerous. Avoid improper operation!

Read and follow the instructions given in the section titled

A

1.

An engine that has been working under load should idle for a few minutes so the

engine parts can cool evenly before it is shut off.

2.

Place all operating controls in neutral.

3. Turn ignition key to the "OFF" or upright position.

A

side Operation" in this manual before operating your tractor.

CAUTION:
brake,
fore dismounting from the operaloi's

Disenciaye all attachment clutches and shift into

STOPPING

Always shut off engine, remov(; key, set parking

and wait until all engine and mower motion has stopped be-

THE

ENGINE

seal.

neu-

hill-

"Hill-

- 17 -

LAWN

MOWl

NG

1. Operate engine at approxinr^ately 3/4 to full throttle and regulate the Travel Control

Lever according to mowing conditions. As a genera! rule, set the throttle as low as
practical to obtain maximum fuel economy but high enough to avoid engine lug
down or labor which could cause overheating and poor mowing performance. Un­less grass is unusually light, always operate in "Low" speed range.

2. If grass is heavy and higher than normal, results can be improved by mowing twice.
Make the first cut with the mower set higher than normal; then repeat with the

mower set at desired finished cut height. When mowing heavy grass, always dis­charge clippings away from the uncut area.

WARNING: Bf sute that the muvvei ilnve levi.'i is off, the encMiie is

shLJt off, the key removed and the bUide lias stopped spinninii Itefoie
attemptrif) to clean a pkigqed dischai chute.

A

3. Figures 11 and 12 illustrate two systems for mowing. If the grass is high or heavy,

always mow to throw the clippings away from the uncut area. Figure 12. If the
grass is light and more thorough mulching is desired, discharge tiie clippings toward

the center of the uncut area. Figure 11. When mowing in this manner, a final strip
of mulched clippings about three to four feet wide will remain near the center of
the tawn. This can be easily swept up to leave a well groomed appearance.

4. Trimming will be neater and closer by using the left side of the mower since the
clippings will be discharged away from the object. Also the safety shield over the
discharge opening prevents mowing as close to objects.

5. Always engage riding mower and mower drive systems smoothly.

Be ceitain whoever operates the mower has read and understands

the safety rules in this manual.

A

Remember, a careful operator is always the best insurance against an

accident. Give complete and undivided attention to the job at hand.

A

CAUTION:

up and thrown.

Clear the work area of objects which might he picked

A

18-

CAUTION;
vent tipping or loss of control. Exercise extreme caution when

changing direction on slopes.

Reduce speed on the slopes and in sharp turns to pre-

E
E

E

CAUTION:
hazards. ^

CAUTION:

allow adults to operate it without proper instruction.

CAUTION:
safe distance away. ;

Stay alert for holes in the terrain and other hidden

Do not allow children to operate the vehicle. Do not

Do not carry passengers. Keep children and pets a

FIGURE 11

FIGURE 12

- 19

PREVENTIVE

MAINTENANCE AND

ADJUSTMENTS

FIGURE 13

CORRECTLY PERFORMED PREVENTIVE MAINTENANCE AND ADJUSTMENTS

ARE IMPORTANT TO YOU!

AS THE OWNER OF A CASE RIDING LAWN MOWER. YOU POSSESS A MA

CHINE THAT IS MADE TO HIGH STANDARDS. |

PREVENTIVE MAINTENANCE BY YOU OR YOUR OPERATOR IS THE EASIEST

AND MOST ECONOMICAL MEANS OF ASSURING MANY SATISFACTORY PRO

DUCTIVE HOURS OF OPERATION.

WARNING: Rotating Fan. Contact with rotating engine flywheel
fins can injure. Keep clear. Do not allow anything to enter engine
cooling air intake duct while engine is running. This duct is exposed

A

.„„ . enclosure raised,, _ ...

only when the engine enclosure is raised. Avoid running engine with

-20-

ENGINE

MAINTENANCE

AIR CLEANER

SCREWS

COVER

Clean air cleaner and re-oil element every 25 hours under normal conditions.

1.

Remove two screws and lift off complete air cleaner assembly.

2.

Remove screen and spacers from foam element.

3. Remove foam element from air cleaner body.

4.

A. Wash foam element in kerosene or liquid detergent and water.

B. Wrap foam in cloth and squeeze dry. Be sure foam is free of any solvents.

SPACERS

SCREEN

FIGURE

POSITION

14

TANGS

AS SHOWN

C. Saturate foam in engine oil. Squeeze to remove.

D. Assemble parts - fasten to carburetor with screw.

When assembling make certain the lip of the foam element extends over edge of

the air cleaner body. The foam element Hp will form a protective

IMPORTANT: If the foam element is damaged in any way or if the lip does

not fully overlap the edge of the air cleaner body, it must be
replaced or serious damage to the engine can result.

CLEANING ENGINE COOLING AIR INTAKE SCREEN

The gasoline engine on your Mod 80 Rider must have an unrestricted flow of cooling

air to perform properly and prevent premature failure.

The rear grille of the engine enclosure must be cleaned of lint, chaff, dust, grass clip-

pings,

leaves, etc. The rear grille must be cleaned daily or more often when debris accum-

ulates during daily usage.

When used with the M-91 Bagger attachment, the rear grille must be cleaned EACH

TIME THE BAG IS EMPTIED.

-21 -

seal.

CARBURETOR ADJUSTMENT

IDLE SPEED

Minor carburetor adjustments may be required to compensate for differences in fuel

temperature, altitude and

ADJUSTING

load.

SCREW

'^j-^

FIGURE

15

VALVE

MAIN

NEEDLE VALVE

The carburetor has three simple adjustments:

1.

High Speed Fuel Mixture Adjustment (Main Needle Valve)

2.

Idle Fuel Mixture Adjustment,(Idle Valve)

3. Idle Speed Adjustment.

1,

Initial Adjustment:

A. Turn main needle valve clockwise until it just closes.

Valve may be damaged by turning it in too far.

B. Then open main needle valve 1-1/8 turns counterclockwise. Close idle valve ii

same manner and open 1-1/8 turns, }

This initial adjustment will permit the engine to be started and warmed up

prior to final adjustment. :

-22-

CAUTION:
justing carburetor.

Final Adjustment:

A. Turn main needle valve in until engine misses {lean mixture). Then turn it

out past smooth operating point until engine runs unevenly (rich mixture).

Now turn to the mid-point between rich and lean so the engine runs smoothly.

B. Hold throttle at idle position and set idle speed adjusting screw until fast

idle is obtained {1750 RPM).

C. Hold throttle in idle position and turn idle valve in (lean) and out (rich) until

engine idles smoothly.

D. Then reset idle speed adjusting screw so that engine idles at 1750 RPM.

Acceleration:

Engine should accelerate without hesitation or sputtering. If engine does not
accelerate properly, the carburetor should be re-adjusted to a slightly richer
mixture

(i.e.,

Riding Lawn Mower Under Load:

Avoid contacting hot exhaust pipe when you are ad-

open main needle valve slightly).

Loss of power, tendency to
mixture. Open the "Main" needle valve in 1/8 turn graduations until
engine runs smoothly. Operating the engine on too lean a mixture causes
loss of power and high exhaust heat. If mixture is too
sound as though flooded and dark smoke will appear in the exhaust fumes.

NOTE:

Erratic engine operation can also be caused by dirt or other foreign

material in the carburetor. Carburetion on small gasoline engines is
always critical of dirt. It is recommended that a filtering fuel
funnel always be used along with clean gasoline. Also check the

ter in the tank outlet fitting periodically.

CAUTION:
speed the engine.

See ENGINE LUBRICATION on page 12 of this manual.

Do not change the engine governor settings or over

ENGINE LUBRICATION

stall,

or excessive backfiring all indicate a lean

rich,

the engine will

- 23-

fil-

SPARK PLUG

The type spark plug provided in your engine is listed as medium in the spark plJ

heat range chart - Prestolite 14-L7 or equivalent.(Prestolite 14RL7 or equivalent in Cana[

Shank Length 7/16 Inch (11.11 mm)

Thread Size 14 MM
Gap Setting 025 Inch (0.64 mm)

MOTE.

It IS possible that under unusual conditions, "colder" type
spark plug may be required. Consult your Authorized Case Dealer re
garding the proper type spark plug to use for your particular condition.

The spark plug plays a very important part in the power, fuel economy and generj
perlormance of your engine The outside of the plug should be cleaned frequently
prevent shorting of the plug

The spark plug should be removed, checked, cleaned and gapped at the end of

100 hours of operation.

REMOVING

It IS important to select the exact size spark plug wrench. The wrong size o-- tya

wrench may cause distortion and insulator breakage. Always use a spark plug wrench

thin wall deep socket wrench of the recommended size.

Thoroughly clean the spark plug,
includmg the threads, with a pen
knife or wire brush and solvent, A
very slight drag should be felt when

the gauge wire passes between the

electrodes.

Reset the gap by bending the side
electrode only. Never bend the center

electrode.

INSTALLING

Install the spark plug in the engine,
with a new gasket, and seat the plug
finger tight' on the gasket. Tighten the
plug about 3/4 of a turn after the plug

is seated firmly on its gasket If a

torque wrench is available, lighten the

plug to 27 foot pounds (36.6 Newton­metre) . This will assure proper seating

and sealing of the spark plug.

ROUND FEELER GAUGE
WILL GIVE A MORE
ACCURATE READING

Do not use abrasive cleaning

chines.

THIS TYPE OF CRACi
USUALLY CAUSED el

1.

DROPPING PLUG

STRIKING PLUG'
WRENCH DURINGI
INSTALLATION

FIGURE 16

evei|

- 24-

TOE-IN

ADJUSTMENT

1.

Locate the riding mower on a hard level surface preferably concrete. Place front wheels

in a straight ahead position.

2.

Make sure the front tire pressures are equal.

3. The front tires should show a mold part-line which coincides with the centerline of
the tire. If the centerline of the tire is not readily visible, then the wheel can be raised
off the ground, spun and marked at the approximate centerline location.

4.

Measure the distance between the tire center lines or the chalk marks.

MEASUREMENT "A" MUST BE 1/8 TO 3/8-INCH (3 mm
TO 10 mm) LESS THAN MEASUREMENT B. BOTH MEA ­SUREMENTS - FRONT AND REAR MUST BE TAKEN AT
SPINDLE HEIGHT ABOVE THE FLOOR.

MEASUREMENT

FRONT

"A'

1>

REAR

MEASUREMENT

FIGURE 17 AS VIEWED FROM THE BOTTOM

5. Loosen both jam nuts on each drag link and turn rods equally.

6. Turn the tie rod in or out of the ball joints as required. Retighten the jam nuts when
correct toe in is obtained. One ball joint has left hand threads and the other right hand
so it is unnecessary to disconnect it from the king pin lugs. Turning the joints off the
tie rod increases the toe in. Turning the joints on the tie rod decreases the toe in.

"B'

- 25-

BATTERY

Your

Model

80 Riding Lawn Mower is equipped with a 12 volt, 12 amp hour lead aci

storage

battery, used for starting the engine only. The engine has magneto ignition whi

does

not drain the battery while operating.

In order to maintain the battery state of charge, the battery charger supplied wi

your

machine should be used as follows:

1. During average usage charge battery for one 24 hour interval at least once every
days.

2.

If engine is stopped and started frequently, charge battery at least once every 2 wee

for one 24 hour interval or more often if

3. To increase battery service life, avoid allowing it to discharge completely be
charge

intervals.

AND

BATTERY

necessary.

CHARGER

4. If a battery charger other than the one supplied with your machine is
charge

battery at a rate to exceed 1.8 AMPS.

5. Battery charger is designed for inside use only.

FIGURE

1.

Raise

Z

Connect the special polorized plug from the battery charger to the matching plug-

18

BATTERY

engine enclosure and prop open with rod.

the battery.

CHARGER

CONNECTING

THE

BATTERY

CHARGER

FIGURE

used,

19

do n

3. Plug battery charger into llOvolt A.C. outlet.

4. Charge battery for a 24 hour interval.

5. To disconnect charger, first unplug from 110 volt A.C. outlet, then disconnect
plug at battery.

speci;

•26-

WINTER STORAGE OF BATTERY

When your Riding Lawn Mower is put into storage, the battery should be removed,

cleaned and placed in a cool dry area.

CAUTION:

negative ground cable first. When installing the battery, always

A

Reconnect the battery charging lead to the battery terminals after removal. Connect

the red lead to the battery positive (+) terminal first and the black lead to the battery

negative {-1 terminal last

The battery should then be recharged monthly as described on page 26. Under no

ditions should the battery be allowed to stand with a specific gravity of L225 or less.

Recharge completely when battery is returned to service in the spring.

connect the ( ) negative ground cable last.

WARNING: To jump start this machine:

1.

Place travel control lever in neutral, set parking brake, and place

mower drive lever in OFF.

2.

Raise engine enclosure and prop open with support roc-

3. Connect positive (Red) (+1 jumper cable to battery terminal on
startei solenoid.

When removing a battery, always disconnect the { t

con-

4.

Connect other end of i^ositive (Red) ( + ) jumper cable to the

^^K^^^ tive (H I terminal post of the booster battery.

5. Connect negative (Black) (-) jumpei cable to negative {•) terminal
of booster battery.

6. Connect other end of negative (Bliick) (•) jimiper cable to the en­gine block. Avoid connection near fuel tank, carburetor and bat-

tery.

7. Stand on left sirle of machine and start using ignition ksy switch,

8. Disconnect jumpet caliles in the i everse order, that is, remove the

negative (Black) (-) cable fiist. Keep ends from touching to pre-

vent sparks.

- 27-

posi-

RULES FOR BATTERY CARE

^ ^k

across

^^k^^L

lighted matches and exposed flames must be kept away

^Hr*^^^

A

A

CAUTION;
all of the exposed metal parts are "live". Never lay a metal object

battery

liquid in the batteries is
clothing.

POISON:
burns.
EXTERNAL, flush with water; INTERNAL, drink large quantities
of water or milk. Follow with milk of magnesia, beaten egg or
vegetable oil. Call physician immediately; EYES, flush with water

for 15 minutes and get prompt medical attention. Keep out of

reach of children.

DANGER; Batteries produce explosive charges. Keep sparks, flame
and cigarettes away. Ventilate when charging or using in enclosed
space. Always shield eyes when working near batteries.

CAUTION:

with the tractor electrical system or battery as you may ground a

live circuit-

When working around storage batteries, remember

the terminals as a

due to the

Batteries contain sulfuric acid which can cause severe

Avoid contact with

Never wear rings or metal watch bands when working

spark

presence

acid.

or short circuit may result.

from

of explosive gas in the battery. The

Use

care

not to

spill

it on

hands

skin,

eyes or clothing. Antidote:

Sparks,

that

the

or

1.

Add approved tap water or distilled water, as needed, to keep the separators cover

Check every 25 hours or weekly depending on air temperature. Normal water t
sumption would be approximately 1 ounce (30 ml.) every 25 hours of operation,

is greater, either the case is leaking or the battery charger is overcharging and must]
replaced.

2,

Keep the battery in a healthy state of charge as shown by hydrometer readings.'

3, Make sure the battery is securely fastened in position. Cable leading from the batHJ

should not lay on the battery container.

4.

Keep the battery clean and dry.

IMPORTANT: The full charge gravity reading is 1.265 for a fully charged battery]

battery having a reading of 1.175 will freeze at approximately 0° F(
enheit (-18°C} temperature.

If a battery will not hold a charge, replace it with a new Battery meeting specificatiij

as listed in the specification section.

- 28-

ADDING WATER

Unless the tap water in your area is "approved" (water free of scale-forming

erals),

always add distilled water to the battery.

When water is added during freezing weather, the battery must receive a charge im­mediately to mix the water and electrolyte. If it is not mixed, the water will remain at
the top and freeze.

Check the liquid level in each cell
weekly. Add water according to lines
on battery case. DO NOT OVERFILL.

FIGURE 20

CELL COVERS AND VENT TUBE

Always keep the cell covers in place and tight. Be sure the vent tube is in place and

free of dirt to prevent gas pressure in cells.

CABLE TERMINALS AND BATJERY POSTS

min-

The battery terminals must be kept clean and tight. A good method of cleaning
terminals is to remove all excess corrosion with a wire brush, then wash with a weak
baktng soda solution or ammonia. After cleaning, a thin coating of vaseline or light cup

grease will retard further corrosion.

IMPORTANT: Do not apply excessive torque when tightening leads on battery ter-

minals because internal battery connections can be damaged.

- 29-

TRACTION

DRIVE MAINTENANCE

FRICTION

1.

Raise

engine enclosure. Prop open

2.

Remove five (5)

3. Install new drive wheel using new

A

capscrews

CAUTION:

shut off engine, «llow engine to cool, remove key and spark plu;

wire before making adjustments to or servicing the Riding Law

Mower. ;

DRIVE

securing drive wheel to hub.

Move attachment drive clutch lever in OFF positior •

WHEEL

with

support rod.

capscrews

REPLACEMENT

and self locking nuts.

I

-30-

ADJUSTING THE CLUTCH LINK

Ease of shifting and proper drive wheel engagement are controlled by the clutch link.

Correct adjustment exists when the:

a. rubber drive wheel is in contact with disc when clutch-brake pedal is released and

clutch link is free (that is under neither tension nor compression) and

b. rubber wheel lifts clear of disc with clutch-brake pedal depressed halfway. (The

second half of pedal travel applies the brake.)

To adjust:

a. loosen jam nut

b. remove bolt securing ball joint to tab on sprocket housing

c. turn ball joint as required

d.

install bolt and tighten jam nut

-31 -

DRIVE

BELT

REPLACEMENT

1. The mower and mower drive belt must be removed before attempting to replace

traction drive belt. Refer to pages 34 and 35.

2.

After the mower drive belt has been removed. Push idler arm in to remove ten

from belt.

3. Slip old belt off pulleys and install new belt.

A

CAUTION:
moved as described in the "Sto'age" section of this manual bet'
standing mower uri end for storage or service.

Be sure gasoline is thoroughly drained and battery

•32-

FIGURE 23 SHOWN WITH MOWER DECK REMOVED FOR CLARITY

-33-

MOWER DRIVE

1. Place mower height selection in lowest position.

BELT

SERVICE

2. Approach mower

3. Place the mower drive lever in the OFF position. Slip belt off
pulley.

4. Place the mower drive lever in the ON position (this lifts belt-brake away
Remove belt

5. Remove belt

6. Reverse the above procedure for installation.

A

from

left

side.

left

side of mower drive

from

right side of mower drive pulley.

from

engine pulley.

CAUTION:
shut

wire before making adjustments to or servicing the Riding Lawn
Mower.

Move

off engine, allow engine to cool, remove key and spark plug

attachment drive clutch lever in OFF position,

from

belt).

SHOWN

WITH

LEFT

SIDE MOWER SUSPENSION DISCONNECTED FOR

FIGURE

-34-

24

CLARITY

MOWER

1.

Place mower height adjust in lowest position.

2.

Remove mower drive belt (see page 34).

3. Remove front and rear suspension link and height adjust link cotter pin, left side first
as shown in Figure 24.

4.

Remove mower drive clutch rod pin and brake return spring.

5. Remove right hand side suspension and height adjust link.

6. Remove deck from under mower chassis.

DECK SERVICE

DECK REMOVAL

CAUTION:

condition,

Keep the yehlcle and attachments in good operating

and keep safety devices in place.

A

CLEANING THE MOWER DECK

With the engine shut off and after the blade has stopped spinning, check and clean out
the inside of the deck housing periodically. Remove any grass wrappings between the
blade mounting adapter and spindle housing. Grass wrappings, if allowed to accumulate,
may work their way under the bearings and damage the seals. Excessive grass accumula-

tion in the deck housing will waste horsepower and cause plugging, streaking, and corro­sion.

WARNING: Be sure that the mower drive lever is off, the engine is
shut off, the key removed and the blade has stopped spinning before

A

attempting to clean a plugged discharge chute.

MOWER ANTI-SCALP WHEELS

The Anti-Scalp wheels should be oiled after each five hours of operation. Make sure
the oil penetrates to the inside of the bushings by holding the deck at an angle while lub­ricating.

-35 -

1. Side to Side Level

DECK

LEVELING PROCEDURE

Position

a.

b. Place mower drive lever in the OFF position.

c.

d.

2. Fore-Aft Level

Position

Level

a.

b. Rotate the blade so it is parallel to the Riding Lawn

c.

mower on level surface

Set mower adjust lever in middle hole.

Position blade at right angles to the Riding Lawn

Turn Height-Adjust Link adjusting nuts until blade tips are the same height

the floor (about 2-1/2 inches {65 mm) .

mower on level surface

adjustments, above, first.

Check to make sure

the mower adjust lever is in the middle hole.

Turn the

a.

b. 1/4" to 3/8" (7 mm to 10 mm) lower than rear if NOT equipped

front

3/8" to 1/2" (10 mm to 12 mm) lower than rear if M-91 bagger is installed.

bagger.

that

suspension link adjustment nuts equally so the

such

as concrete garage floor.

Mower

chassis.

such

as concrete garage floor. Follow Side to Side

the mower drive lever is still in the OFF position and

Mower

chassis.

front

from

that

tip of blade is:

with

M-91

c.

This adjustment should be made

so

equipped) empty.

d.

Recheck side to side level as described above and readjust if required.

FRONT

SUSPENSION LINK

ADJUSTMENT

NUTS

with

FIGURE

operator's seat unoccupied and bagger (if

HEIGHT ADJUST LINK

25

ADJUSTMENT

NUTS

-36-

BLADE

BOLT

FIGURE

MOWER

Before

operating the mower for the first time,

must

be tight. After the first 8 hours of operation,
removed,
tightness

it is good practice to install a new lockwasher under the bolt, and again

after the next 8 hours of operation.

CAUTION:
equipment is in safe working condition.

Keep all nuts, bolts, and

26

BLADE

BOLT

check

check

the bolt holding the blade. It
it again. Whenever the blade is

check

screws

tight

to be

sure

the

A

BENT

BLADE

Check

for bent blade before mounting the mower and after impact Blade tips should
be within 1/4 inch (6 mm) of the same horizontal plane. Mowing with bent blade will
cause

missed

strips and a poor mowing job. A bent blade should be replaced immediately.

CAUTION:
inspected
should

The vehicle and attachments should be stopped and

for damage after striking a foreign object, and the damage

be repaired before restarting and operating the equipment.

A

-37-

SHARPENING BLADE

With the engine shut off and after the blade has stopped spinning, check the mowe
blade periodically for nicks and dullness. A damaged, dull or improperly sharpened bladf
can cause a shattered, rather than, clean cut and brown areas or grass may develop. Refe

to Figure 27 for the correct sharpening angle.

CAUTION:
shut off engine, allow engine to
wire before making adjustments to or servicing the Riding Lawn

A

After a blade is sharpened always check it for balance. A balancing
below, can be obtained from your local supplier for this purpose. A properly balanced
blade will level itself when placed on the balancing

Mower.

CORRECT ANGLE

OF SHARPENED

CUTTING EDGE

Move attachment drive clutch lever in OFF position,

cool,

remove key and spark plug

WRONG ANGLE TO
SHARPEN CUTTING

EDGE

FIGURE 27

BALANCING BLADE

tool,

such as shown

tool.

BLADE CUTTING

EDGE

CAUTION:
mature wear and failure of bearings and spindle. If the blade cannot
be balanced by resharpening, replace it with a new one.

A

FIGURE 28

An unbalanced blade is hazardous and will cause pre-

-38-

POINTS

AND

CONDENSER COIL

BATTERY CHARGER

1. YELLOW

2.

BROWN

3. RED

4.

PINK

5. ORANGE

6. BLACK

BATTERY 33

MAGNETO

START

a

>

a

>

STORING

THE RIDING LAWN MOWER

If your Riding Lawn

age procedures should be followed.

1. To prevent gum deposits
and run engine until gasoline in carburetor is completely consumed.

2.

While engine is still warm, drain oil

gine lubrication page for proper type and weight.

3. Remove spark plug, pour 2 or 3 tablespoons (30 ml) of SAE 30 oil into cylinder and
crank

momentarily to distribute oil. Replace spark plug.

4. Clean

MOWER

cleaned

dirt

and chaff

Clean

grass

accumulations

DECK

SERVICE

When your Riding Lawn

and placed in a cool dry area.

£ \: When removmg a battery, always disconnect the ( )

^A^^ negative ground cable first When instalhng the battery, always

Mower

from

will not be used for 30 days or more, the following stor-

ENGINE

from

forming in the fuel

cylinder head fins and blower housing.

from

mower deck. See CLEANING THE MOWER

section of this manual.

BATTERY

Mower

STORAGE

system,

from

crank

case

MOWER

is put into storage the battery should be removed,

DECK

STORAGE

completely drain fuel tank

and refill

with

fresh oil. See en-

DECK

in

^^^r^^^k connect the (-) negative ground cable last.

Reconnect

the red lead to the battery positive (+) terminal and the black lead to the battery negative

(-) terminal.

The

TENANCE.

gravity of 1.225 or

Recharge

Thoroughly clean lawn mower

in the Lubrication section of this manual.

The

1. Be sure gasoline is thoroughly drained into an approved contamer to prevent leakage
when mower is stood on end.

the battery charging lead to the battery terminals after removal. Connect

battery should then be recharged monthly as described under

Under no conditions should the battery be allowed to stand

less.

completely when battery is returned to service in the spring.

Riding Lawn

LAWN MOWER

chassis.

Mower

may then be pushed to its storage area and stood on its end.

CHASSIS

Completely lubricate lawn mower as described

-40-

BATTERY

with

MAIN-

a specific

CAUTION:
moved as described in the "Storage" section of this manual before

standing mower on end for storage or service.

Be sure gasoline is thoroughly drained and battery re-

A

2.

Be sure to REMOVE BATTERY before lifting. Tipping the battery on end will cause

minute particles of sediment from the bottom of the battery to lodge between the cell
plates and consequently ruin the battery. Warranty will not be allowed on this type of
failure.

3. Care should be used when lifting the unit to avoid strain and physical injury. Be sure
the unit is standing securely before working on it.

4.

Reach under and lift by the front frame area and NOT THE FRONT RUBBER BUM-

PER.

5. Attach a cord or chain between the upper part of the Lawn Mower Chasis and the wall
or ceiling. This will prevent the unit from falling if it is accidentally pushed or
bumped.

I \

FIGURE 30 SHOWN IN STORAGE POSITION

-41 -

-NOTICE

At the time your Case Dealer delivers your new riding mower,he will acquaint you

with its operation and maintenance as outlined in the "Owner Warranty Registration".

When your Dealer has completed these instructions, he will ask you to sign the report and

will then hand you a copy for your records.

-

A

CAUTION:
ment.

Use care when pulling loads or using heavy equip-

a. Use only approved drawbar hitch point.

b. Limit loads to those you can safely control.

c. Do not turn sharply. Use care when backing.

d.

Use counterweight{sl or wheel weights when suggested in

the owni;r's manual.

•42-

ATTACHMENTS

MODEL M-92 THATCHER

MODEL L-90 SWEEPER

-43-