Case IH 766 Tractors Operator’s Manual Instant Download (Publication No.1084180R1)

1
766 Tractors Operators Manual
1084180R1
eprinted
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THIS SAFETY ALERT SYMBOL INDICATES IMPORTANT
SAFETY MESSAGES IN THIS MANUAL. WHEN YOU SEE THIS
SYMBOL, CAREFULL Y READ THE MESSAGE THAT FOLLOWS
AND BE ALERT TO THE POSSIBILITY OF PERSONAL
INJURY OR DEM H B
If Safety Decals on this machine use the words
Danger, Warning or Caution, which are defined as
follows O DANGER Indicates an immediate
hazardous situation which if not avoided, will
result in death or serious injury. The color
associated with Danger is RED. O WARNING
Indicates an potentially hazardous situation
which if not avoided, will result in serious
injury. The color associated with Warning is
ORANGE. O CAUTION Indicates an potentially
hazardous situation which if not avoided, may
result in minor or moderate injury. It may also
be used to alert against unsafe practices. The
color associated with Caution is YELLOW. If
Safety Decals on this machine are ISO two panel
Pictorial, decals are defined as follows O The
first panel indicates the nature of the hazard. O
The second panel indicates the appropriate
avoidance of the hazard. O Background color is
YELLOW.
O Prohibition symbols such as
and if used, are RED.
X
WA I IMPROPER OPERATION OF THIS MACHINE CAN CAUSE
INJURY OR DEATH. BEFORE USING THIS MACHINE, MAKE
CERTAIN THAT EVERY OPERATOR O Is instructed in
safe and proper use of the machine. O Reads and
understands the Manual(s) pertaining to the
machine. G Reads and understands ALL Safety
Decals on the machine. M Clears the area of other
persons. G Learns and practices safe use of
machine controls in a safe, clear area before
operating this machine on a job site. It is your
responsibility to observe pertinent laws and
regulations and follow Case Corporation
instructions on machine operation and maintenance.
2001 Case Corporation
Bur 0-00000 issued November, 1994
CASE and IH are registered trademarks of Case
Corporation
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To The Owner
Assembled in this manual are operation,
lubrication, and maintenance instructions for
the Farmall 766 Tractor. This mate- rial has been
prepared in detail in the hope that it will help
you to better understand the correct care and
efficient operation of your tractor. Your new
International Harvester tractor is designed to
meet today's exacting operat - ing requirements.
The ease and comfort of operation, the ability
to match ground speeds to engine power and work
requirement, and the effortless versatility of
the hydraulic system are intended to lighten your
work and shorten your hours on the job.
of servicing tractors, and modern tools, and
original- equipment IH servieetparts which assure
proper fit and good performance.
To obtain top performance and assure ec- onomical
operation the tractor should be in- spected,
depending on its use, periodically, or at least
once a year, by your International Harvester
Dealer. Before you operate the tractor, study
this manual carefully. It has been prepared to
help you operate and maintain your tractor with
utmost efficiency. New copies may be ordered
from your dealer at a nominal price. When in need
of parts, always specify the tractor and engine
serial numbers, including prefix and suffix
letters. Write these serial numbers in the
spaces provided below.
Your local International Harvester dealer is
interested in the performance you receive from
this tractor. He has factory-trained servicemen,
informed in the latest method
Tractor serial number
t Gosol ine engine serio I number
Di esel Engine serial number
Tractor serial number
2-
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CONTENTS
Description Page No.
Contents .............................................. Introduction........... -................................. Work Safely - Follow These Rules............................. Tractor Instruments and Controls ............................. Cab Controls ........................................... Cab Equipment Preventive Maintenance ......................... Before Operating Your New Tractor ........................... Driving the Tractor ...................................... Gasoline Engine and Fuel System ............................. Diesel Engine and Fuel System ............................... Hydraulic Controls for Three-Point or Two-Point Hitch .............. Three-Point Hitch ....................................... Weight Transfer Hitch..................................... Two-Point Hitch......................................... Hitching Trailing Equipment to the Tractor....................... Auxiliary Valves, Remote Cylinders, and Hydraulic Outlets ........... Power Take-Olf ......................................... Cooling System ......................................... Air Cleaning System ...................................... Electrical System........................................ Front Wheels........................................... Rear Wheels ........................................... WeQhs.............................................. Pneumatic Tires ........................................ Storing the Tractor....................................... Cold Weather Precautions .................................. Lubrication ............................................ Lubrication Table........................................ Lubrication Guide........................................ Preventive Maintenance Guide ............................... Specifications ..................... ..................... Optional Equipment....................................... Universal Symbols For Tractor Instruments And Controls............. Iudex ................................................ 1 2 34, 5 to 7 89 , 10 to 13 14 15 to 19 20 to 22 23 to 28 29 to 32 33 to 41 41 to 43 44 to 46 47 to 49 50 to 54 54, 55 56 to 58 59, 60 61 to 66 67 to 69 69 to 77 78to80 80, 81 82, 83 83 84 to 88 89 90 to 95 96 to 98 98 to 103 103 104, 105 106 to 108
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INTRODUCTION
1 - Front 2 - Right 3 - Rear 4 - Leff IIlust.
2 Ri ght si de of troc tor showing terms of
locoti on.
LE IT and RIGHT indicate the left and right
sides of the tractor when facing for- ward in the
driver's seat. The illustrations in this manual
are num- bered to correspond with the pages on
which they appear for example, l l lusts. 18
ond l8A ore on po ge 18.
A variety of optional equipment is avail- able.
Refer to Optional Equi pmenl. Operating and
maintenance instruction on these items is in-
cluded in the instructions for operating or
maintaining the tractor. Disregard instruc-
tions for equipment not on your tractor.
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8
WORK S/FELYFOLLOW THESE RULES The symbol is
used to colI your attention to instructions
concerning your personal sa(ety. Be sure to
observe and ol low these instructions.
Before starting engine make sure helpers or
observers stand clear of equipment. Operate the
engine only in well ventilated areas. Release
park brake completely.
A CAREFUL OPERATOR IS THE BEST IHSUR- AHCE
AGAINST AH ACCIDENT
BEFORE STARTING
Know the controls and what they do. When fueling
an engine, keep any type of open flame away. Do
Not Smoke! Wait for the the engine to cool before
refueling it. Cheek brakes and clutch for correct
ad- justments. Reduce tipping hazards by
spreading wheels as far as your work program per-
mits.
DURIHG OPERATION
Power take off master shield must always be in
place on the tractor. Use the drawbar in lowest
position when hitching to a heavy load, such as
manure spreaders, loaded two- wheel trailers, and
heavy wagons. Pull only from drawbar never hitch
to axle housing. Shift transmission to neutral
and set park brake before dismounting to hitch
equipment. Keep safety shields in place when
using power take- off.
Check coolant and engine oi1 levels, and perform
any other necessary services, be- fore starting
the engine.
Clean dirt, trash, and grease from oper- ator's
platform, pedals, steps, and steering wheel. Be
sure muffles and exhaust pipe exten- sions are in
place so exhaust gases are dis- charged above
operator. Always carry a Charged fire extin-
guisher and a first aid kit.
Disengage PTO and turn OFF engine be- fore
adjusting or unelogging power driven
machinery. When the belt pulley is operating,
wait for the belt to STOP completely before
making any adjustments or removing the belt.
Avoid loose-fitting clothing, which could catch
on moving parts.
Mounting assist handles and steps are provided
for your safety. Use them when getting on or off
the tractor. Put all controls in neutral before
starting the engine. Be sure power take- off
lever is in the OFF or disengaged position
before start- ing the engine.
Only the operator should ride on the trac- tor.
He should sit on seat or stand on the
platform. Keep others, especially children, from
riding on steps, fenders, or drawbar, and away
from tractor and equipment.
Continued on next page
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9
WORKSAFEY-FOLLOWTHEERULE
TRANSPORTING Reduce speed when traveling on
rough roads . Avoid heavily-traveled roads when
mov- ing equipment, if at all possible. Use
warning devices (ie. flags, S. M. V. emblem,
lights , etc .) which are approved for use by
your local government agencies, when moving
equipment on public roads. Keep these devices
clean and in good working con- dition. Be sure
hitches and/or drawbars are pro- perly stabilized
before towing equipment. When moving on public
roads , or from field to field, lock brake pedals
together for simultaneous operation when making a
stop. Be courteous , have consideration for
other traffic using the road. AFTER
OPERATING Wait for tractor to STOP before dis-
mounting. Lower equipment to ground before leav-
ing tractor. Shut off engine and remove ignition
key. Lock the park brake so tractor will not
roll. To remove radiator cap when engine
is HOT, turn cap to the pressure relief point -
let pressure and steam escape - then re- move it.
DURIHG OPERATION - Confinued
Reduce speed before making a turn.
Always keep the tractor in gear when going down
steep hills.
Avoid ..... sudden starts , excessive speed, and
sudden stops ..... when oper- ating on hillside ,
rough ground, and most off-the- road operations
. Carefully supervise inexperienced operators
. Stop the engine before leaving the tractor.
TRACTORSWITH CABS
Be sure cab doors are securely latched, either
closed or open, when operating the tractor.
Always use the seat belts , il they are furnished
with the unit. However, do not in- stall seat
belts if the tractor has no pro- tective
frame. Adjust rear view mirrors for maximum
vision. Lock the cab doors, if locks are fur-
nished, when leaving the tractor.
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10
TRzKCTOR INSTRUMENTS KND CONTROLS
Before attempting to start or operate the
tractor, be sure to review all the instructions
for the new tractor and thoroughly familiarze
yourself with the instruments and controls .
Index to reference numbers for items shown in
lIlusts 6 end 7. The items listed here are
described on various pages in this manual. Refer
to Index. Nole For the symbols used to
pictorially identify various tractor instruments
and controls , refer to the Universal Symbols
for Tractor Instruments and Controls.

• - Fuel gauge
• - Charge indicator gauge
• - Engine oil pressure gauge
• - Engine coolant temperature gauge
• - Control quadrant light
• - Range lever

1. - Draft control (outside lever)
2. - Independent power take- off operating lever
3. - Seat adjustment (forward and rearward) (shown
   on gasoline engine tractor)
4. - Seat adjustment (raise and lower) (shown on
   gasoline engine tractor)
5. - Seat adjustment (ride control)

- Speed lever (shown on gasoline engine tractor)
8 - Key switch 23 - Clutch pedal
9 - Choke control lever (gasoline) 24 - Lighting switch
10 - Transmission oil pressure Tellite 25 - Cigarette lighter
11 - Horn button 26 - Fuse housing
12 - Park lock lever 27 - Push button starting switch
13 - Brake pedal latch 28 - Speedometer-tachometer
14 - Brake pedal 29 - Torque amplifier lever
15 - Auxiliary valve operating levers 30 - Air cleaner service indicator
16 - Differential lock pedal 31 - Engine speed control lever
17 - Position control (inside lever) 32 - Ether starting push button
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CONTROLS
TRACTORINSTRUMEMTS AND
Location of instruments and controls - diesel
shown. Reference numbers for items i llusfrated
above are I isted on page 5.
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CAB CONTROLS
The Air Conditioner for the DeLuxe Cab is avail-
able for diesel tractors only.

1. - Windshield wiper switch
2. - Air condifioner switch and cold control
3. - Pressurizer fan speed switch

1. - Heater confrof
2. - Air recirculation control
3. - Dome Light

Illust. g Deluxe cab controls shown.
These instructions refer to the Custom and DeLuxe
Cab with standard equipment.
Note The cab electrical system is not on until
the key switch is on.
The illustrations shown are of the DeLuxe cab.
.ERATIHG THE STANDARD CAB CONTROLS (Deluxe and
Custom Co6s)
Pressurizer fan and speed switch
I'he controls for the Custom Cab may be in a
different location than those shown.
The pressurizes fan is controlled by a three
speed switch and air is directed into the cab
byadustablelouvers. Formmimum pressurization the
switch shoultl be in the "Hi (high) position.
The cab has alresh airfiker andpres- surizer
system which when in operation provides filtered
fresh air into the cab.
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14
CAB CONTROLS
OPERATING THE STANDARD CAB CONTROLS (Deluxe and
Custom Cobs) - Continued
Turn si gnols
Pressuri zer fan and speed switch
The switch must be on to deliver hot air.
The turn signal lever (located to the left of the
steering wheel) is used by moving it down for
left turn and up for right turn as shown by
flashing lights on side towards turn, with steady
light shown on opposite side . Hote In order to
actuate turn signals tractor taillight must be
on. Turn signal switch for standard dual flashing
warning lights operation should be in the center
position.
Air recirculation controls (Deluxe cab on Iy)
To obtain quick warm up of air in the cab, in
extreme cold weather conditions, pull out air
recirculation control to recirculate in- side
air. For one hundred percent filtered fresh air
place the control at the In posi- tion.
OPERATION OF CONTROLS FOR AIR COfJDITIOHING
V indshield wiper switch
The windshield wiper is controlled by a remote
switch (On and Off) .
Air conditioning switch and cold control
The control must be in On position and
temperature may be controlled as desired by the
position of the control. P ressurizer fan and
speed switch must be in the On position for air
conditioning to operate.
Dome lighf
The dome light is on a live circuit and can be
operated independent of tractor key switch. It is
turned on and off by a toggle switch adjacent to
the light.
Air recirculation controls (Deluxe cobs only)
OPERATION OF CONTROLS FOR HEATER (Deluxe and
Custom Cobs)
In extreme hot weather conditions, to obtain
quick cool down of air in the cab, puH out the
air recirculation control to recircu- late
inside air. For one hundred percent filtered
fresh air place the control at the In position.
Heater control
The heat control must be turned on and the degree
of heat may be varied by the position of the
control.
9
15
CAB EQUIPMENT PREVENTIVE M9.INTENANCE
PRESSURI ZER FILTER
RECIRCULATION AIR FILTER (Deluxe cabs on ly - if
so equipped)
1 - Recirculation filter llust. l0A

• 1 - Pressurizer fi lfer
• Illust. 10
• The filter must be cleaned frequently, as
  required by operating conditions, in order to
  assure full flow of fresh air.
• Rotate the filter retainer latch to release the
  filter.
• Remove filter unit by pulling tab. See
• lllust. 10.
• After removing the filter it may be cleaned by
  tapping it gently with the air inlet side facing
  downward being careful not to damage filter
  housing or sealing surfaces .
• Compressed air may be used but extreme care must
  be taken, to prevent damage to the paper filter.
  Blow air through the filter from the back side
  (40 p. s. i. maximum air pressure is
  recommended) .
• Filter may also be washed periodically in a
  suitable filter cleaner or mild non- sudsing
  detergent. Reverse flush in clear water.
• Hole Filter must be thoroughly dry be- fore
  reinstalling in the cab. Do not force dry with
  heat over 150 F . When cleaning, carefully
  inspect the element for any evi-

• dence of damage (such as small holes or tears)
  and immediately replace a damaged filter.
• Remove the cover and then the filter from the
  front upper end, inside the cab. See
• lI lust. 10A.
• Clean the filter frequently as required by
  operating conditions . Use mild soap and water.
  Rinse with clear water and gently squeeze out the
  excess.
• AIR CONDITIONER CONDENSER
• This unit located at the top rear of the cab, is
  equipped with a vertical finned core assembly
  which is self-cleaning in opera- tion.
• In operation, turn air conditioner off
  momentarily and accumulated chaff, etc . on
  lower face of condenser fins will be jarred loose
  by vibration of the tractor. When air conditioner
  is again turned on it will oper- ate at increased
  cooling efficiency.
• Periodically as required, the condenser fins may
  be blown clean with air or flushed with water to
  fully renew cooling efficiency.

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CAB EQUIPMENT PREVENTIVE MAINTENANCE
REFRIGERANT SIGHT GLASS
ADJUSTING THE COMPRESSOR BELT TEHSIOH
1 - Sight gloss

• T - Compressor mounting bracket bolts
• - Adusting bolt and lock nut
• - Compressor oi I fi I ler plug
• - Coolant shutoff (ie(I rear shown -
• right front located on engine thermostat housing)

The sight glass is used to determine if
sufficient refrigerant charge is in the air
conditioning unit.
I llust. 11 A Left side of diesel engine shown.
To check the sight glass remove both plugs at the
rear of the condenser box.
The compressor drive belt is adjusted for tension
by moving the compressor on its mounting bracket.
See II lust. I lA.
View sight glass through one hole while
illuminating the sight glass through the other
hole.
Loosen the three mounting bracket bolts and the
adjusting bolt lock nut. Tighten the belt by
turning the adjusting bolt in loosen the belt
by turning the adjusting bolts out. The tension
is correct when the belt can be deflected with a
25 pound load 15/32- inch midway between the fan
and compressor pulleys. When using a belt tension
dial gauge, the recommended range is 100 to 120
pounds (direct reading on the dial). After
adjustment is made, tighten the adjustment bolt
lock nut and the mounting bracket bolts.
Be sure sight glass is clean.
If the sight glass is cloudy, with many bubbles,
in continuous running cycle, the unit is low on
refrigerant charge and must be serviced to full
charge condition for efficient cooling. See your
International Harvester dealer.
11
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CAB EQUIPMENT PREVENTIVE MAINTENANCE
COMPRESSOR PULLEY AND CLUTCH
Gasoline Engine
The compressor clutch should be peri- odically
cleaned thoroughly. Remove the compressor drive
belt. Then remove the bolt "A" (lllust. I l
A). Thread a 5/8-inch - llNC bolt in clutch at
"A", and slowly tighten to remove the pulley and
clutch from the shaft. Remove the bolt from the
clutch.
Thoroughly clean inside recessed area, of pulley
and clutch. Clean the face, outside dimension
and inside dimension of the coil. Reassemble
pulley and clutch and secure w1th bolt at "A"
(Illust. 11A).

1. - Coolant shut-offs (2)
2. - Radiator drain cock (not seen)
3. - Crankcase drain plug

IIlust. 12
The coolant shut-offs are located at the right
side of the engine, one in the front and one at
the rear of the engine. See lllust. 12.
Reassemble belt and adjust the tension.
See Adjusting the Compressor Belt Tensi
on. FUEL SHUT-OFF COMPRESSOR OIL
LEYEL Forsatisfactory operation, the oil level
in the compressor must be checked peri- odically.
See your International Harvester dealer.
COOLANT SHUT-OFF
The coolant shut-offs for the heater are provided
for easy shut-off in the summer, or servicing for
any reason, so it will not be necessary to drain
the system.
1 - Fuel shut-off location
II lusf. 12A
The fuel shut-off can be reached by fold- ing the
padding back at the left side of the steering
column and removing the access cover. See II
lust. l2A.
Diesel Engine
The coolant shut-offs are located at both sides
of the engine. See I llusl. 1 I A.
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CAB EQUIPMENT PREVENTIVE MAINTENANCE
ELECTRICAL
Ga sol ine
All cab power, except the dome light is
controlled by the key switch. The cab power is
protected by a 30 ampere circuit breaker
(gasoline) and two 30 ampere breakers (diesel)
mounted on a bracket. To get at the circuit
breaker, remove the battery access cover at the
right side (inside the cab). See Illusts 13 a nd
\3A.

1. - Bo ttery
2. - Relo y

1. - Circuit brea k er
2. - Fla sher unit

Note The cab is rubber isolated from the
tractor chassis, and a ground return cable is
used from the right corner of the cab to the
tractor battery grounding point. The ground strap
should be disconnected for any servicing of the
electrical system. Tractor to cab wiring
connection is at the right front corner of the
cab under the plat- form. See I llusl. 13.
I I lust. 13A Delux e Co b shown.
Bo ttery loca tion
On the Deluxe Cab the batteries are lo- cated
under the cab platform at each door opening. For
servicing, remove the access cover under the
floor mat. ee l l lusts 13 o nd 13A.
Nole On the custom cab it is mounted on the
right side step support assembly. F la sher unit
If the standard dual flashing lights do not flash
as required when turn signal switch is in center
position, the flasher unit may need replacement.
See Il lusfs. 13 end l3A.
Diesel
Floodlights Front cab floodlights operate with
trac- tor lights for field work at night, with
the lighting switch at the "R"
position. MISCELLANEOUS The vinyl covering on
the foam panels may be cleaned by vacuuming or
wiping clean with soap and water using a damp
cloth.

1. - Flasher unit
2. - Battery

1. - Relay
2. - Circuit breakers

Replace windshield wiper blades when they are
worn and do not wipe adequately. For safe
operation keep the cab windows clean.
5 - Si x un i t connector
Illust. 13 Deluxe cab shown.
13
20
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