Case J40 User manual

""-
RO TARY MOWER
J 0, J44, J46
Operator's Manual No. 9-50555
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J I Case
A Tenneco Company

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IF THIS MACHINE IS USED BY AN EMPLOYEE OR IS
LOANED OR RENTED, MAKE ABSOLUTELY CERTAIN
THAT THE OPERATOR(S), PRIOR TO OPERATING:
1. fS fNSTRUCTED fN SAFE AND PROPER USE.
2. REVfEWS AND UNDERSTANDS THE MANUAL(S)
PERTATNfNG TO THE I\1ACHfNE.
751253
BEFORE STARTING ENGINE
STUDY OPERATOR'S MANUAL SAFETY MESSAGES
READ ALL SAFETY SIGNS ON MACHINE
CLEAR THE AREA OF OTHER PERSONS
LEARN & PRACTICE SAFE USE OF
CONTROLS BEFORE OPERATING
IT IS YOUR RES PON SIBILITY TO UNDE RST AND AND FOL LO W MAN U F ACTURER'S INSTRU CTIONS
ON M ACHINE OPERAT IO N . SERV IC E, AND TO O BSERVE P ERTINENT L AWS AND REGU LAT. IO NS .
OPE RATOR AN D SERVICE MANUA LS MAY BE O BTAIN E D FROM YOUR E QUI PMENT DEA LER.

SAFETY MESSAGES
Regard your lotary mower as <J
CAUTION: Fill gas tank out of
piece of power equipment anci be doors and avoid
spilling gasoline.
sure this manual
is read and under-
Do not fill tank with gasoline while
stood by all who operate It .
A A
smoking or while engine IS running .
CAUTION: Never allow children
h A Maintain your tractor and I otal y
or young teenagers to opel ate the
.. mower In top operating condition.
tractor and rotary mower
A
CAUTION: Unbalanced blades are
a hazard and
will cause premature
wear and failure of bearings and
spindles.
If the blades cannot be
balanced by resharpening, replace
them with new ones.
A
CAUTION: Never g-et 011 or off
the tractor while the mowel IS
running.
- 3-

,
CAUTION: Disengage attachment
h.
A
CAUTION: Give complete and un- -drive lever, stop engine and remove
.. divided attention to the job at hand.
key and spark plug wire(s) before
making adjustments.
CAUTION: Shut off engine, allow
CAUTION: Stop engine, disengage
engine to cool and remove key and
attachment drive, set parking brake
spark plug wire(s) before replacing
and remove key when tractor is
mower drive belt.
unattended.
A A
CAUTION: Disengaqe attachment
A
rn
drive cl utch when someone ap-
CAUTION: Do not allow anyone
proaches or whenever the mower
other than the operator to ride on
is being transported.
the tractor.
A
CAUTION: Be sureyoll knowhow
to ~top the tractol Jnd mower at il
moments notice.
m
CAUTION: Stop and inspect the
mower for damage immediately af-
ter striking a foreign object and
repair damage before restarting and
A
operating the machine.
WARNING: Improper operation of
your tractor on hillsides and slopes
can be dangerous. Avoid improper
operation!
Read and follow the in-
structions
given in the section ti-
rn
tled "Hillside Operation" in this
DANGER: Spinning Blade. Keep manual before operating your trac-
clear. Contact
can injure. tor.
IMPORTANT: Always install new decals whenever the
old decals are destroyed, lost, painted
over or illegible. When individual parts
are replaced that have decals attached,
be sure to install a new decal with the
new part. Replacement decals are a-
vailable from your Case dealer.
- 4 -

HILLSIDE (SLOPE) OPERATION
Avoid operating tractor on hillsides and slopes. To mini-
mize
the possibility of accidents while operating on hills
and/or rough terrain, obey a combination of rules, prac-
tices
and good common sense.
These include:
1. Reading, understanding, and obeying all written safety
messages appearing on decals on the machine and in
operat'Dr's manuals.
2. Learning
from your operator's manual and carefully
from EXPERIENCE how to operate your tractor cor-
rectly. Know your tractor's limitations.
3. Knowing the terrain on which you are operating your
tractor. There are terrain conditions on which your
tractor cannot be operated!
4. Learning to expect changes in operating conditions.
Adding or removing attachments or weight to your
tractor will make your tractor perform differently.
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.
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 tractor.
Case Lawn and Garden Tractors are designed and built to
comply with the Voluntary Standard ANSI B71.1 - 1972
and B71.1 a - 1974 (American National Standards Insti-
tute).
The diagram depicts the max imum angles that the sta-
tionary tractor, less mounted equipment, was subjected to
without tipping, measured on a perfectly flat, smooth,
and hard surface. 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 opera-
ting the tra<:tor.
5
THE OPERATOR IS THE SOLE JUDGE AS TO THE
DEGREE OF SLOPE ON WHICH THIS TRACTOR CAN
BE
SAFELY OPERATED. IF IN DOUBT THAT THIS
TRACTOR CAN BE SAFELY OPERATED ON A PAR-
TICULAR SLOPE, DO NOT OPERATE ON THAI
SLOPE! COMMON SENSE MUST PR EVAI L.
Read, Understand, Obey:
Safety messages are found on the tractor and in the op-
erator's manuals. These must be understood by the trac-
tor o~erator to be of value. Be sure that these messages
are
studied before starting and/or operating the tractor by
an
operator not familiar with this particular tractor.
Learn to O~erate:
Learn your tractors controls from decals on the tractor
and from instructions in the operator's manual. Practice
how to properly manipuillte these controls. Practice must
be done in a flat area, clear of obstacles and bystanders.
Learn your tractors operating characteristics and limita-
tions. These include:
a. amount of engine power available
b. engine governor response
c.
tractive abil ity
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 tractor's limitation 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 tractor on it. Mark obstacles, such
as, rocks,
ruts or holes with a 6 ft. long pole and ;-ed flag
and ~ well clear of these obstacles when ORe rating.
Operate your tractor at a ground speed slow enough to in-
sure
complete control at all times.
Place
the transmission in low range and 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 hill. 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.
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 tractor on slopes or hillsides.
You may
encounter some terrain on which your tractor
cannot be operated even if a different piece of equipment
has operated there in the past .
Learn
to Compensate for Changes in Operating Condi-
tions:
Adding or removing attachments or ballast (such as wheel
weights
or fluid) change the weight and weight distribu-
tion of your tractor and, therefore, change your tractors
operati ng characteristics.
Be alert to these changes. Practice operating the tractor
after each change has been made.
Adding an
attachment (weight) to the rear of the tractor
reduces the weight on the front axle. Adding an attach-
ment (weight) to the front of the tractor reduces weight
on the rear of the tractor. You must add counterweight
to the front if a rear mounted attachment is installed.
You
must add counterweight to the rear if a front moun-
ted attachmerlt is installed.
Tractive
conditions will vary with weather and terrain and
equipment.
Areas wet with dew, rain or snow 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.
Spinning rear wheels tend to move the tractor sideways.
The
addition of tire chains will provide more traction to
the rear wheels in the forward-reverse direction but less
stability in the sideways direction. Chains will cause more
abrupt starting and stopping.
The final word in safe tractor operation rests on your
judgement.
If in doubt of your safey - STAY OFF THE SLOPE .
6

INTRODUCTION
This manual contains recommended operating procedures,
safety rules, adjustments, maintenance
information, assem-
blyand mounting instructions. Read this manual carefully
before operating
your rotary mower.
Your -' I Case Compact Tractor Dealer is well qualified to
answer any further q.uestions you might have concerning
your rotary mower. Also, if the need should arise, his
Service Department
with factory trained technicians,
..
SPECIAL INFORMATION
TRACTOR MODEL
446 All C 19652 special offset lift
link supplied with tractor
MOWER APPLICATION CHART
MOWER
J-40
J-
44
J-46
MODEL
RECOMMENDED TRACTOR
210, 220, 222
222, 224, 444, 446, 644,
224, 444, 446, 644, 646
MODEL
646
genuine
Case replacement parts and the required facilities
is in the position to provide proper repairs in the shortest
time possible.
The
definitions "Right, Left, Front, and Rear" as used
throughout this manual relate to the tractor and rotary
mower as the operator is seated facing forward in the
normal operating position
of the tractor.
FOR INSTALLATION ON
PRIOR MODEL TRACTORS
TRACTOR MODEL
USE KIT
220, 222 prior to SIN 9646800
H- 38
442, 444 prior to SIN 9646800
H-39
BELT APPLICATIOI\I CHART
TRACTOR MODEL
210 All
220 Prior to SIN 9656747
220 SIN 9656747 and after
222 PRIOR
TO SIN 9658189
222 SIN 9658189 and
after
224AII
442 All
444 Prior to SIN 9661261
444 SIN 9661261 and after
446 All -..
644 Prior to SIN 9698343
644 SIN 9698343 and after
646 All
* Belt shipped with loader tractor
BELT PART NUMBER
C23358
C23807
C23358
C23807
C23358
C23358
C23809
C23809
C23359
C23J59
; C238 07
C23810-
C23808*
NOTE: Part numbers are subject to change without notice. Contact
your J I Case Compact Tractor Dealer.
7

'/
OPERATING CONTROLS
.;I>.
The principle components and controls of your rotary
mower are identified in Figure 1 with the same description
used throughout this manual.
All controls are located near the operator's position on the
tractor. The mower blades are placed in motion by en·
gaging the
attachment drive cl utch lever. The desired
mowing height can be adjusted with the height selection
lever.
HEIGHT SELECTION
LEVER
ATTACHMENT LIFT
LEVER
CLUTCH
HIGH·LOW
Generally best performance is obtained with the transmis·
sion in
Low range and the engine running % to full throttle.
The throttle should be set as low as practical to obtain
max i mum fuel economy but high enough to prevent engine
lug
down or labor which could cause overheating and poor
mowing . Adjust the tractor ground spee"d with the travel
lever according
to your mowing conditions.
FIGURE 1 (MODEL 220WITH MODEL J40 38" ROTARY MOWER)
OPERATION
1. Keep mower blades sharp and balanced as covered in 3. If grass is heavy and higher than normal, results can be
the Maintenance Section
of this manual. 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
2. Operate engine at full throttle for normal mowing con- heavy grass, always discharge clippings away
from the
ditions and·regulate"the ground speed with travel lever.
uncut area.
If grass is very light, the throttle setting may be re-
duced
to obtain maximum fuel economy but should
always
be kept high enough to avoid engine lugdown
WARNING: Be sure that the at"
which causes overheating and poor mowing perfor·
tachment drive clutch is off, the
mance. engine
is shut off, the key removed
and the blades have stopped spin-
ning before
attempting to clean a
A
Unless
grass is unusually light, always operate with the
plugged discharge chute.
High·Low Range Selector in the "LOW" position.
8
I

4. Figures 2 and 3 illustrate two systems for mowing. If
the grass is high or heavy, always mow to throw the
clippings away from the uncut ijrea. Figure 2. If the
grass is light and more thorough mulching is desired,
discharge the clippings toward the center of the uncut
area, Figure 3. When mowing in this manner, a final
strip of mulched clippings about three to four feet wide
will remain near the center of the lawn. This can be
easily
swept up to leave a well groomed appearance.
FIGURE 2
FIGURE 3
5.
Trimming wi II be neater and closer by using the right
side of the mower since the clippings will be discharged
away from the object. Also the safety sh ield over the
discharge opening prevents mowing as close to objects .
6. Do
not step on the mower deck when getting on or off
the tractor. If mounting the tractor from the right side,
place your right foot on the right foot rest, your right
hand on steering wheel and left hand on the seat back
and step onto the tractor, swinging your left foot
through between the steering wheel and seat.
When mounting from the left side, start with your left
foot on the left foot rest, your left hand on steering
wheel and right hand on seat back and step onto tractor
swinging your right foot through between steering
wheel and seat. Dismount the tractor using the reverse
of the above procedures.
A
CAUTION: Never get on or off
the tractor wh ile the mowel IS
running.
7. The mechanical or hydraulic lift lever is used to raise
the mower into transport and to lower it i nto cutting
position . A slight pulling pressure on the mechanical
lever will permit the release button to be more easily
depressed.
Lower the hydraulic lift until the lift arms are posi-
tioned midway in the lift link slots . This will allow the
mower deck and gauge wheels to follow the contour of
the ground.
Do not place the hydraulic lift control lever in the
hydraulic float position when mowing.
The Height Selection settings are explained in the
adjustments section of this manual.
8. Alway s engage tractor and mower drive systems
smoothly.
A
Be certain whoever opel ates the
mower has read and understands
the Safety Rules In the front of this
manual.
9

ADJUSTMENTS
A
CAUTION: Disengaqe attachment
drive :ever, stop eng;nc and remove
key alJd spark plug wl re(s) before
making adjustments.
1. Height Select i on Lever. See Figure 4.
The mower cutting height is adjustable from l Y:." (40
mm) to 3Y /' (90 mm) in Y:." (12 mm) increments.
To change cutting height:
1
a. Raise
mower i nto transport position to relieve
weight from the height selection lever.
b. Pull
outward on the height selection knob.
c. Move the lever up or down to the desi red height.
d. Push
knob i nto the hole selected.
t,
2. Gauge Whee ls . See Figure 4.
I
I
Always operate the mower wi th the gauge wheels on
the ground and , all weight off the mower lift links to
obtain a level and uniform cut. Be slife the gauge
wheels cle'ar
the ground when transporting the mower.
..
:
..,
J
,
I
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FIGURE 4 AD JU STMENTS
(Special Lift Link used with Tractor Model 446 shown)
I I WIND KEY CL OCK WISE
3. Drive Belt Tension. See Figure 5. BY HAND
AS F' AR AS
POSSIe l E ANO PLACE
-A
TTA C HM ENT DRiv E IN
EN GA GE ME NT POSi T rO N
The mow er drive belt is properly tensioned when the
21 IN STA LL B ELT OV ER
front idler spring has 1/8 inch (3 mm) (approximately
P U LL~YS AND IDL ER
PULLEYS AS SHO WN .
DECK DRIVE
the th ickness of two nickels) gaps between its coils.
DOUBLE CHECK THAT TH E
PU LLEY
BEL T IS PROPERLy SEAT·
ED IN EAC H PULLEy WIT H
ONLY O NE 90 DECREE
TWIS T BETWE EN SUCCEED ·
ING PUL LE YS
IMPORTANT
Check and adjust th e tens i on on a new
belt after the first 20 mi nutes and the
3' WIND KEY COU NTER·
CL OCKWISE UNT IL SPR IN G
next hour of mowing since it is normal
SH OWS 116 INCH CAP BE ·
TWEEN COILS AS VIEWEO
for a belt to stretch slightly during its
FROM THE SlOE. T HE TVt' O
I
DL ER PULLEYS SH OULD BE
initial run·in period.
APPROX. [VFN OR CL OSE
SP RING TO A COMMON CENTER
:si LINE
•• ~ . IDLE RPU LLE YS
To increase the belt tension, turn the adjusting key in
I) LOOSEN
EY
4. AT P ERI ODIC INT ERVA LS
a
counterclockwise direction while facing the front of
R EC H ECK FOR 1/8 IN CH
I ~l BETW EE ~ CL EARANCE
the tractor.
TI GHTEN
~ C OIL S ANO ADJUS T "'S
R EQUI REO
To decrease the belt tension or to install or remove· the
belt, turn the adjusting key clockwise.
FIGURE 5
10

4. Mower Fore-Aft Leveling Links. See Figure 6.
Clean
cutting and minimum horsepower consumption
are dependent upon the mower being level fore and aft.
To adjust, locate the tractor and mower on a level
surface such as your garage floor and place the Height
Selection lever in
the 2'/," setting. Lower the mower
into the cutting position.
To raise the front of the mower, first loosen the rear
nut on each link and then equally turn _ the front nuts
rearward.
To lower the front of the mower, loosen the front nut
of eacli link and turn the rear nuts forward.
Position blades so that they are parallel to the tractor
frame (f~re and aft line) before measuring clearance.
Check blade heights as close to the front and rear edges
of the mower blades as possible. Be sure to tighten
both front and rear nuts when checking blade height.
Adjust the leveling links until the distance between the
blade tips and the level surface is the same at both the
front and rear of the mower . The forward tip may be
slightly lower than the rearward tip. Never permit the
rearward tip to be lower than the forward tip. (This
doubles power consumption in mowing)!
5. Mower Side
to Side Leveling. See Figure 6.
Mower side
to side level i ng is ad justed at the factory.
Shou Id readjustment become necessary, it may be done
by loosening the two carriage bolts on the right hand
side
that secures the gauge wheel carrier to the deck.
The holes may be slotted if additional adjustment is
required. After obtaining a level position, r.etighten
the carriage bolts.
Side
to side leveling should be done on a level surface,
such as your garage floor with the height selection lever
in the 2'/," setting and the mower lowered into the
cutting position. Be sure the ' mower is level fore and
aft before checking side to side level.
i·
FIGURE 6 ADJUSTMENTS
• (Special Lift Link used with Tractor Model 446 shown)
11

MAINTENANCE
A
CAUTION: Disengage attachment
drive lever, stop engine and remove
key and spar'k plug wire(s) before
making adjustments,
1. Mower Blade Bolts. See Figure 7.
Before
operating the mower for thE' first time, check
the bolts holding the blades. They must be tight. After
the first 8 hours of operation , check them again. When-
ever
the blades are removed, it is good practice to install
new lock washers under the bolts, and again check
tightness after the next 8 hours of operation.
2. Bent Blades. See Figure 7.
Check for bent blades before mounting the mower and
after impact . Blade tips should be within 1/4 inch (6
mm) of the same horizontal plane. Align all six blade
tips.
two at a time as shown in Figure 7 to determine
this. Mowing with bent blades will cause missed strips
and a poor mowing job. Bent blades should be re-
placed immediately .
3. Mower Gauge Wheels. See Figure 8.
Remove the gauge wheels after each 10 hours of mow-
ing and lubricate the bushings and axle bolts with
chassis grease. As an alternate to grease, the wheels
can be oiled after each four hours of operation. Make
sure the oil penetrates to the inside of the bushings by
holding the deck at an angle while lubricating.
4. Mower deck belt replacement. See Figure 8.
The deck belt is automatically tensioned by a spring
loaded idler
pulley and does not require adjustment.
Install a new belt in the following manner:
HEX NUT
e lNG LOA ;;;;- IDLER PUL
~
MOWER BLADE BOLTS
TIPS SHOULD BE WITHIN
1/4" (6 mm) OF SAME
HORIZONTAL PLANE.
FIGURE 7
a. Remove
the deck belt guard.
b. Relax the,idler pulley tension by pivoting it towards
the front of the deck with a 9/16" box wrench
placed on the hex nut.
c. Remove the old belt.
d. Place the new belt around th~ 3 SPindle pulleys and
idler.
e.
Rotate system by hand to check for free operation
and idler take up.
. f. Replace deck belt guard.
TENSIONING SPRING
1
, .
l
FIGURE 8
J-46 MOWER DECK WITH DECK
BELT GUARD REMOVED FOR CLARITY
12

5. Sharpening Blades. See Figure 9.
With the engine shut off and after the blades have
stopped spinning, check the mower blades periodically
for nicks or dullness. Damaged, dull or improperly
sharpened blades can cause a shattered, rather than,
clean cut and brown areas of grass may develop . Refer
to Figure 9 for the correct sharpening angle. Sharpened
edge must be at least 2-1/2" (65 mm) long.
7. Cleaning
the mower deck.
With the engine shut off and after the blades have
stopped spinning, check and clean out the inside of
the deck housing periodically. Remove any grass
wrappings between the blade mounting plates and
spindle housings. Grass wrappings, if allowed to accum ·
ulate, may work their way under the bearings and
damage the seals. Excessive grass accumulation in the
deck housing wi II waste horsepower and cause plugging
and streaking, as well as, corrosion.
f; ·::. :f;sg .:" " $~
CORRECT ANGLE
WRONG ANGLE TO
OF SHAR PENED SHARPEN
CUTTING
CUTTING EDGE EDGE
FIGURE 9
NOTE: The 48" mower has different length blades. The
center blade is one inch (25 mm) shorter than
the two outboard blades.
Be sure the shorter blade is reinstalled to the
center spindle.
Rotate the mower blades after installation to in-
sure adequate clearance through their full 360
0
of travel.
6. Balancing Blades.
See Figure 10 .
After a blade is sharpened, check it for balance by
inserting a dowel in the center hole and place between
two level edges as illustrated. A balanced blade will
center itself so the cutting edges are parallel with the
level edges.
/DOWEL OR SOLT
/: BLADE
;.< CUTTING
EDGE
FIGURE 10
CAUTION: Unbalanced blades are
8. Tractor and Engine Maintenance . See Figure 11 .
Complete tractor and engine maintenance instructions .
are outlined in your tractor Operator 's Manual. When
mowing, gi ve particular attention to areas which are
affected by grass accumulat i on .
Check
and brush off the engine ai r intake screen and
heat exchanger fins daily. Also check and clean the
engine air cleaner element daily. If mowing . under
particularly dry or dusty conditions, a precleaner
which fits over the regular element is available from
your J I Case Dealer. This precleaner can be washed
out with soap and water as necessary and will extend
the life of the dry element furnished with the tractor.
~~ \
DRY ELEMENT
FIGURE 11
A a
hazard and will cause premature
wear and failure of bearings and
9. Tire Pressure
spindles.
If the blades cannot be
balanced by resharpening, replace Maintain
the tires at equal and recommended pressures.
them with new ones.
Refer
to your tractor Operator's Manual.
13

INSTALLATION
I. ASSEMBLY
1. Before assembling
the mower , layout and check the
individual components . See Figure 12.
The JAO Mower is shipped with one drive belt and one
set of lift links since it is intended for use on low
clearance
(200 series) tractors only.
The J-44 and J-46 Mowers are shipped with two drive
belts
and two sets of lift links since they may be
mounted on either low clearance (200 or 600 series)
tractors or high clearance (400 series) tractors.
FIGURE 12 MODELJ-46 ROTARY MOTOR -DISASSEMBLED
3. Assemble
the lift links to the mounting bracket and
secure
with cotter keys as shown in Figure 13.
The special link PIN C 19652 for the Model 446
(supplied with tractor) should be installed on the right
hand side.
The slotted end of the links will be connected to the
tractor lift arms when mounted.
14
BELT AND LIFT LINKS FOR
200 AND 600 SERIES TRACTORS
MOUNTING BRACKET
BELT AND LIFT LINKS FOR
400 SERIES TRACTORS
2. Select the appropriate belt using application chart on
page 7. The belt part number is stamped into the
outer covering of the belt.
NOTE: Belt
for 600 series tractors is shipped with trac-
tor.
Select the two short lift links if installation is to be on
a low clearance (200 or 600 series) tractor.
Select the two long lift links if the installation is to be
on a Model
444.
Select one long lift link and special link PIN C 19652
(supplied with tractor) if the installation is to be on a
Model
446.
NOTE Do not preassemble the mounting bracket
to the mower deck as shown in Figure ,13.
It
is easier to install the mounting bracket
to the tractor first and then attach the mower
deck to it.

I
~ -- MOUNTING BRACKET
NOTE: DO NOT PREASSEMBLE
MOUNTING BRACKET TO MOWER
DECK AS SHOWN. REFER TO
STEP 3 - ASSEMBLY.
FIGURE 13
MODEL J-46 ROTARY MOWER -ASSEMBLED
·1
II. MOUNTING
1. Locate tractor on a level surface. Check tires for equal
and
recommended pressures as found in your tractor
Operator's Manual.
2. Before
attaching the mounting bracket, turn the
TIGHTEN BE LT
adjusting crank counterclockwise as far as possible to
provide mounting clearance at the front axle. Refer to
Figure 14. FIGURE 14
BELT ADJUSTMENT
15

3. Position the mounting bracket under the front of the
stall plain washer on each clevis pin and install in the
tractor and onto the anchor pins as shown in Figure 15 .
front hole of the lift arm from the inside. Secure the
Raise
the front of the bracket and release the snap fast links with the safety pins at the outside. Refer to
I?ins to lock in place. Figure 15.
~
For Model
446 only, the special right lift link should
NOTE Model
644 and 646 - The mounting bracket
be installed on the outside .of the right lift arm. Install
is attached with the two clevis pins and plain washer
on the outside against the lift link slot.
safety pins connected to each front side of
Refer
to Figure 16.
the frame.
Install left lift link on Model 446 as described above.
4. Lower
the lift arms fully. For ALL models except 446,
position the lift links on the inside of the lift arm. In-
5. Raise the lift arms into the transport position.
FIGURE 15 MOUNTING THE JA6 MOWER MOUNTING BRACKET
...
~.
.~
.;.
6. Place the height selection lever in the 1'/," setting to
gain additional clearance aod slide the mower under the
tractor from the right hand side and align the deck with
the attaching holes in the mounting bracket. Raise the
mower to the 2-1/2" setting. Lower the mounting
bracket to the mower deck. Refer to Figure -16.
7. Install
the Fore-Aft leveling links to the mounting
bracket as illustrated in Figure 16.
8.
Connect the mounting bracket to the tabs on the mower
deck with the clevis pins and safety pins provided.
~- '- .
-NOTE Lifting
the mower deck upward slightly will
aid
in aligning the holes between the mount-
ing bracket and deck tabs.
16
9. Select the proper drive belt according to the table on
page 7. With
the engine shut off, key removed, and
cool to the touch, engage the attachment drive lever.
Raise
the hood and remove the spark plug wire(s) for
safety. Insert the drive belt in front of the idler pulleys,
between the fan and heat exchan .ger and onto the
attachment drive clutch pulley. Turn the adjusting
crank clockwise until the belt can be easily placed
around the idler pulleys and onto the mower drive
pulley.
A
CAUTION: Shut off engine, allow
engine
to cool and remove key and
spark plug wire(s)
before replacing
mower drive belt.
-~
/1

FIGURE 16 MOUNTING THE J-46 MOWER DECK
(Special Lift Link used with 446 Tractor shown)
10. Check to make sure the belt is properly located in each
IMPORTANT Before operating the mower, review and
pulley . Turn the adjusting crank counterclockwise to
follow the recommendations outlined
tension the belt until the idler spring coils open 1/8 in the adjustments and Maintenance
inch
(3 mm) (approximately the thickness of two nic- section
of this manual.
kels.
See Figure 5 and 14.) Disengage the attachment
drive lever and reconnect the spark plug wire(s).
The J I
Case Company reserves the
right to make improvements in
design or changes in specifications
at any
time without incurring any
obligations
to install them on units
previously sold.
/
.1
Printed in U.S.A. U.S. Price $.40 6-78·0P-l0,OOO
17

--
TROUBLESHOOTING MOW ER PERFORMANCE
A. MOWER LEAVING STRIPS OF GRASS, SKIPS, RAGGED OR UNEVEN CUT
""- ..-:,:
POSSIBLE CAUSE -
....... "
.. '-
ri~ ..
~
.
CORRECTION
t
"""
1. Underside of mower deck plugged with cutting residue. 1. Remove mower and clean underside.
,..
I
2. Blades dull, nicked or improperly sharpened .
2. Cutting edge must be kept sharp and at least 2- 1/2 ."
(65 mm) long.
3. Engine
speed too low. 3. Adjust engine speed to 3600 RPM.
4.
Ground travel speed too fast. 4. Reduce
ground travel speed.
5. Grass
too tall. 5. Mow
first pass at highest mower height setting. Mow
second pass at desired mower height setting.
6. Drive
or deck belt sl ipping. 6. Inspect belts, adjust tension or replace as required.
7.
Attachment drive clutch slipping.
-
7.
Adjust or repair attachment drive clutch.
J
B. MOWER LEAVING STEPS OR LINES IN GRASS
POSSIBLE CAUSE CORRECTION
1. Mower deck not level side to side. 1. Level mower deck· side to side.
oJ'
C. MOWER CONSUMES TOO MUCH POWER, MOWS POORL Y
I
POSSIBLE CAUSE CO RRECTI
ON
1. Blades dull.
1. Sharpen blades.
2. Mower deck
not level - front to rear
2. Level deck. D ec k should be level to 1/8 " (3 mm) low
in front.
3. Blades installed upside-down.
3. Install correctly. Blades rotate counterclockwise -cut-
ting edge
must lead.
4. Blade
bent . 4. Replace blade.
D. CENTER BLADE ONLY CUTTING
POSSIBLE CAUSE CORRECTION
1. Deck belt broken. 1. Replace deck belt.
18
.I'

Printed in U.S.A.