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«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

3306 VEHICULAR ENGINE FOR 966C WHEEL LOADER
Media Number -REG01116-02 Publication Date -01/05/1980 Date Updated -10/10/2001

Air Cleaner Elements And Housing

SMCS- 1051-12; 1051-11; 1054

Remove Air Cleaner Elements And Housing

,
a

a.
I. Remove the right side door (1) of hood.

2. Remove cover (3) and primary filter element (4).

3. Loosen the precleaner clamp (5) and hose clamp (2).

4. Remove precleaner from air cleaner housing.

5. Remove secondary element and housing (6) from pipe.

Install Air Cleaner Elements And Housing

 o!

,
'r; _t.-4@
.t

• Install secondary element (I) and housing (2) on pipe (3). Install nuts and tighten to a torque of20 ± 5 lb.ft
(27±7Nm)

2. Install precleaner (4) and tighten clamp on precleaner and hose.

3. Install primary filter and cover

4. Install right side door of hood

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Specifications
966 WHEEL LOADER AIR SYSTEM AND BRAKES
Media Number -REG01415-00 Publication Date -01/05/1973 Date Updated -10/10/2001

Air Compressor
SMCS- 1051-12; 1051-11; 1054

8S894 (Bendix Westinghouse 281624)

Cutout pressure of governor ... 120 ± 2psi(8.44 ± 0.14 kg/cm)

Cut-in pressure of governor ... 101 ± 3 psi(7.10 ± 0.21 kg/em?)

Adjustment:

One tum counterclockwise of adjusting screw raises cutout pressure •. 20 psi(l .41 kg/cm)

Time needed to raise pressure:

High idle ... .9 min.

Low idle •. 3.0 min.

 O'!
ol

(I) Torque for nut ... 150 ±2 1b. ft.(20.7 ± 0.3 mkg)

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Specifications
966 WHEEL LOADER AIR SYSTEM AND BRAKES
Media Number -REG01415-00 Publication Date -01/05/1973 Date Updated -10/10/2001

Air Brake Chamber

SMCS- 1051-12; 1051-11; 1054

ht]j

o
2 X55¢-8¥1

(I) Length of rod for brake chamber ... 3.43 to 3.56 in.(87.12 to 90.42 mm)

Maximum stroke ... 2.25 in.(57.15 mm)

(2) 5K592 I Spring for emergency brake and parking brake:

Length under test force ... 4.50 in.( 114.30 mm)

Test force ... 1400 lb.(635.0 kg)

Free length after test ... 9.50 in.(241.30 mm)

Outside diameter •. 5.38 in.(136.65 mm)

(3) Torque for nuts •. 100 ± 10 1b. f.(13.8 ± 1.38 mkg)

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

3306 VEHICULAR ENGINE FOR 966C WHEEL LOADER
Media Number -REG01116-02 Publication Date -01/05/1980 Date Updated -10/10/2001

Oil Filter Base

SMCS-1306-15; 1306-11; 1306-12

Remove Oil Filter Base

Tools Needed A

2P8250 Strap Wrench 1

1. Remove oil filter with tool (A)

2. Remove oil filter outlet line (3).

3. Remove oil filter inlet line (2).

4. Remove bolts that hold the base to the oil cooler.

5. Remove the oil filter base ( 1 ).

Install Oil Filter Base

Tools Needed A

I 2P8250 Strap Wrench

'

1. Put the oil filter base (I) in position on the oil cooler.

2. Put lubricant on the O-ring seals. Install the inlet and outlet lines for the oil filter base.

3. Install oil filter (2) with tool (A).

Disassemble And Assemble Oil Filter Base

start by:

a) remove oil filter base

• Remove bolts (D), covers (2) and (5) from the oil filter base

2. Remove the springs and plungers from the oil filter base
3. Make sure all of the parts are clean and put clean engine oil on them.

4. Install plunger (4), spring (3), cover (2) and bolts (1) of the bypass valve for the oil cooler in the oil filter base.

5. Install plunger (7), spring ( 6), cover ( 5) and bolts of the bypass valve for the oil filter in the oil filter base.

end by:

a) install oil filter base

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Systems Operation
26SI Series Alternator
Media Number -RENR1252-01 Publication Date -01/10/1999 Date Updated -09/10/2001

101166613

Normal Operation
SMCS- 1405
Illustration 1 g00620877
26-SI Alternator Schematic

The 26-SI series alternator is a brushless, heavy-duty integral charging system. The alternator has a built-in
diode rectifier and a voltage regulator. The system produces DC current for electrical systems.

The solid state integrated circuit voltage regulator that is built into the 26-SI alternator limits the system voltage
by switching the ground circuit for the rotor field on and off. When the ground circuit is on, field current passes
from a diode trio through the stationary field coil. Nominal regulated voltages of 13.5 to 14.5 volts are available
for 12 volt systems. The nominal regulated voltage for the 24 volt system is between 27.0 and 29.0 volts.

As the alternator begins operating, the regulator detects battery voltage that is applied to the ignition terminal.
The initial exciting current then flows through the rotor coil. When the ignition switch is turned ON the regulator
turns on and off. This occurs intermittently in order to reduce battery discharge. Current is kept to a minimum of
approximately 0.17 amperes.

The voltage regulator turns ON the field current and the voltage regulator turns OFF the current many times in
one second in order to keep the voltage at a preset level.

For 12 volt systems, an output rating of 85 amperes is standard. For 24 volt systems, output ratings of 50 or 75
amperes are available. The output ratings of a specific 26-SI model are located in Specification, "Alternator".

The 26-SI alternator is designed for a one-wire charging system configuration. One wire refers to the minimum
number of connections that are necessary at the alternator for operation. The output of the alternator must be
connected to the positive terminal of the battery. A ground path is also required. The ground path should run
between the alternator housing and the ground terminal for the battery.

The initial voltages at start-up are generated by residual magnetism in the rotor. As the speed increases and the
output increases, the voltage that is available at the diode trio becomes sufficient to supply field current for
normal operation. When output voltage exceeds battery voltage, the alternator begins to drive the system
voltage. The residual magnetism can be lost. This results in no output. Loss of the residual magnetism can be
caused by extended downtime or a severe shock to the alternator. Refer to Troubleshooting, "T6 Residual
Magnetism Restoration".

While the system voltage is below the setting of the voltage regulator, the regulator turns on the field current.
This allows the alternator to produce the maximum output. When the voltage setting is reached, the regulator
turns off the field current. When the field current is off, the magnetic field in the rotor collapses and the
alternator output voltage begins to fall. The falling voltage causes the regulator to tum on the field current and
the current rebuilds the magnetic field. This cycle continues rapidly. The cycle keeps the output and the system
voltage very close to the voltage setting. The cycle will continue unless the electrical demands of the system
cause the system voltage to fall below the voltage setting. If the system voltage falls below the voltage setting,
the regulator will allow full field current to flow so that the alternator's maximum output is realized.
 • •
( )

Illustration 2
(I)Positive Terminal

(2)Relay Terminal

External connections to the 26-SI alternator are made to the terminals that are shown in illustration 2. The
standard output terminal is a female type. The connecting bolt is insulated. The cable for charging has a special
connector. When the connection is installed, the electrical connection is sealed from moisture. No voltage exists
at the exposed parts. The head of the connector bolt is normally stamped "NO VOLTS" in order to indicate the
insulated type.

All of the electronic parts of the alternator are sealed in a compartment in order to keep out the moisture and the
dirt.

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

3306 VEHICULAR ENGINE FOR 966C WHEEL LOADER
Media Number -REG01116-02 Publication Date -01/05/1980 Date Updated -10/10/2001

Engine (Earlier)
SMCS- 1000-11; 1000-12

Remove Engine (Earlier)

start by:

a) remove radiator and guard

t. Disconnect the battery cables from battery.

2. Remove the oil from the hydraulic system.

3. Remove bottom guard for the transmission.

4. Disconnect control rod from governor.

0
_ ,ey.'

"75f;
·
_.yeas, lo i i

· mtg
5. Disconnect wires (2) and (4) from the starter and alternator. Put identification on each wire.

6. Disconnect wire for glow plugs.

7. Disconnect gauge line for oil pressure.

8. Remove floor plates and firewall.

9. Disconnect fuel lines (I) and (3).

10. Disconnect line for fuel pressure.

11. Disconnect the air outlet line (7). Disconnect line (5) for water temperature

12. Disconnect air line (6) from air compressor governor

13. Disconnect the two oil lines from oil cooler for torque converter

14. Disconnect inlet line for hydraulic pump

15. Disconnect outlet hoses (8) and (9) for the hydraulic pump and remove the hoses with the engine.

16. Remove the two bolts from the front support.

I7. Install a jack under the torque converter as a support during the removal and installation of the engine

18. Fasten a hoist and remove bolts (0) from the torque converter housing.

--
19. Remove the engine. Weight of engine is 2500 1b. (1134 kg).

Install Engine (Earlier)

I. Connect a hoist and put the engine into position in the machine. Turn the crankshaft if necessary to put
flywheel gear in alignment with gear of torque converter.
2. Install the bolts that hold the engine to the torque converter. Remove jack (I) from under the torque converter.

3. Install the bolts and nuts in front support of engine.

4. Connect inlet hose (2) and two outlet lines for hydraulic pump.

5. Connect the two lines for the torque converter cooler.

6. Connect air line () to the air compressor and line (5) to governor

7,Connect the gauge line (3) for water temperature.

8. Connect lines for fuel pressure and engine oil pressure

« ii

..d
l- •
9.Connect fuel lines (6) and (9) to fuel filter housing.
10. Install firewall and floor plates.

11. Connect wires (7) and (8) to starter and alternator.

12. Connect control rod to governor.

13. Install transmission guard.

14. Connect the battery cables to the battery.

15. Fill the hydraulic tank to the correct level.

end by:

a) install radiator and guard

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Shutdown SIS

I Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

966 WHEEL LOADER VEHICLE SYSTEMS
Publication Date -01/04/1980 Date Updated -10/10/2001
Media Number -REG01118-02

Main Frames
SMCS-7051-11; 7051-12

Separation Of Main Frames

Tools Needed A B C
8$7615 Pin 2 2
8$7640 Stand 2
8$7621 Tube 2
8$7610 Base Assembly 2
8$7650 Cylinder 2
3$6224 Hydraulic Pump (electric) 2
289886 Hydraulic Jack 1

start by:

a) remove steering control valve

b) connection of anti-pivot link

c) remove center drive shaft

1. Put blocks in front of and behind the wheels.

2. Connect an air supply to the air tank and release the brakes.
3. Remove the cotter pin and pin from each of the slack adjusters (1) on the rear wheels. Tum the slack adjuster
adjustment screw (2) counterclockwise to lower the slack adjuster away from the rod of the rotochambers.

A, WARNING
Release the pressure from the air reservoir before any lines are
disconnected.

4. Disconnect the air supply and release the air in the air tank.

5. Remove the bolt and washer (3) from the pin in the steering cylinder.

s -g

6. Put several smaller washers (4) in position and install the bolt.

7. Use a large hammer to hit the bolt until the pin assembly can be removed.

8. Do Steps 5-7 for the other steering cylinder.

9. Drain the oil from the hydraulic tank.

10. Disconnect lines (5) and (6) from the hydraulic tank

1. Disconnect two lines (7) and remove bolts (8) and lower the block

12. Disconnect four hose assemblies (9) and (10).

13. Remove the bolts, washers and plate (1D).

r if
I•
14. Remove the bolt and clamp (12)

15. Disconnect wire harness (I).

l6. Remove the bolts, washers and plate (14)

7. Install blocks (15) between the frame and axle housing on each side to increase stability.

I8. Put a floor jack in position under the rear frame for support when the machine is moved.

19,Fasten a lift truck under the rear of the machine

20. Install tooling (A) under the rear of the machine for support while the pins in the main frames are removed.

21. Put tooling (B) in position under the rear of the loader frame

22. Put blocks (16) in position as shown.

 --
23. Put tooling (C) in position. Use tooling (C) to remove the upper pin

24. Remove the bolts, cover (17) and the shims

25. Put tooling (C) in position and remove the lower pin.

1 h..
; f --
26. Use a hammer and punch to remove spacer (I8).

w
27. Make a separation of anti-pivot link (19) and fasten a hoist to the top of the ROPS.

, WARNING
Make sure floor jack and hoist are moved with the rear main frame •

•
l
4

28. Move tooling (A) clear of the machine.

29. Slowly make a separation of the main frames.

30. Put tooling (A) in position under the rear frame. Put blocks (16) in position under the frame for support.

31. Put blocks in front of and behind the tires.

Connection Of Main Frames

Tools Needed A B C D
3$6224 Hydraulic Pump
(electric) 2
8$7610 Base Assembly 2
8$7650 Cylinder 2
8$7615 Pins 2 2
8$7840 Stand 2
8$7621 Tube 2
289886 Hydraulic Jack 1
1P520 Driver Group 1

, WARNING
Make sure floor jack and hoist are moved with the rear main frame.

1. Move the main frames together carefully. Make an alignment of the steering cylinders and their bores.
2. Put tooling (A) in position under the rear frame

3. Connect the anti-pivot link

4. Use tooling (B) to lift or lower the frames for alignment of the pin bores.

5. Put blocks in position under the frames for support.

6. Put spacer (I) in position in the lower hitch.

7,Put tooling (C) and (D) in position and install the spacer
8. Install plate (2) and two bolts.

9. Install two 5/8" 11 NC guide bolts in pin (3)

10. Put pin (3) in position and make an alignment of the guide bolts and the holes in the plate. Install the pin

M
11. Install two bolts (4) in the plate and tighten them to a torque of 50 ± 10 lb.ft. (70 ± 14 Nm). Make a
measurement of the gap between the frame and plate (2) in several places with a feeler gauge

12. Find the minimum gap and subtract .010 in, (0.25 mm) to get the correct shim thickness.

13. Install shims (5), plate (2) and the bolts. Tighten the bolts to a torque of 150 ± 20 1b.ft. (200 ± 25 N·m)
 -'
14. Put pin (6) in position. Make an alignment of the holes in the frame with the holes in the pin.

"iI,
f

I5. Install plate (7) and the bolts. Tighten bolts that are opposite each other the same amount. Do the procedure
again until all bolts are tightened.

16. Install the bolt and clip (9).

17. Connect wire harness (8)

18. Put plate (10) in position and install the bolts.

19. Connect four hose assemblies (ID).

20. Connect two lines (12). Put the block in position and install bolts (13)

21. Connect line (14).

22. Connect two lines (I5).

23. Put washers (17) between the cylinder rod and the frame

24. Put pin (16) in position and install the washer and bolt. Tighten the bolt to a torque of 150 ± 20 I.A. (200 ±
25 Nm)
+ 0•
2
25. Connect the rotochamber rod to slack adjuster (18). Make an adjustment to the rear brakes. See REMOVE
AND INSTALL BRAKE ROTOCHAMBERS for brake adjustment

26. Fill the hydraulic tank to the correct level.

end by:

a) install center drive shaft

b) separation of anti-pivot link

e) install steering control valve

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I Previous Screen [
< Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

950 & 966C WHEEL LOADERS OPERATOR'S STATION
Media Number -SENR2055-00 Publication Date -01/11/1979 Date Updated -11/10/2001

Governor Control Pedal

$MCS - 1265-11; 1265-12

Remove Governor Control Pedal

Tools Needed A
1P510 Driver Group 1

1. Remove floonnat (I) from the cab.

14 f

2. Remove bolts (3) that hold the floor plate. Remove floor plate (2).
3. Remove the spring (not shown) from linkage rod (6) and the bottom of the floor plate

4. Remove cotter pin, pin and link (not shown) from the bottom of the pedal assembly. Disconnect linkage rod
(6) from the pedal assembly.

5. Remove bolts (7) that hold the brackets to the floor plate. Remove governor pedal assembly (4)
6. Remove brackets (5) from each side of the pedal assembly. Remove the pin

7,Use tooling (A) to remove bushing (8) from the pedal assembly

Install Governor Control Pedal

Tools Needed A
1P510 Driver Group I

1. Use tooling (A) to install the bushing in the pedal assembly. Install the bushing until it is even with the surface
of the pedal assembly.
2. Install pin (2) in the pedal assembly

3. Put brackets () in position on the pin

a
4. Put pedal assembly (3) in position on the floor plate. Install the bolts that hold the brackets to the floor plate.

5. Put linkage rod (4) in position on the pedal assembly. Install link, pin and cotter pin. Install the spring on the
linkage rod and the bottom of the floor plate

6. Install floor plate (5) and floor mat in the cab

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-momma·El Serice lnformation System Shutdown SIS

[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

3306 VEHICULAR ENGINE FOR 966C WHEEL LOADER
Media Number -REG01116-02 Publication Date -01/05/1980 Date Updated -10/10/2001

Radiator And Hydraulic Oil Cooler

SMCS- 1353; 1374-12; 1374-11

Remove Radiator And Hydraulic Oil Cooler

Tools Needed A
5P9736 Bracket-Link 2

start by:

a) remove hood

1. Drain the coolant from the cooling system. Drain the oil from the hydraulic tank.

2. Remove elbows(!) and (2) from the radiator top tank and cylinder head.

a m

+.;
•MT.]
.K
3. Remove bolts (4) and remove panel assemblies (3) from each side of the machine.
4. Remove the bolt that holds the clamp for tube (7) to the radiator guard

5. Remove plates (5) and (6). Disconnect the upper end of tube (7) from the hydraulic oil cooler

6. Loosen the clamp for the hose on the end of tube (7). Remove the bolt that holds clamp (8) to the radiator
guard and remove tube (7)

7, Remove bolts (10) and plates (9). Disconnect tube (ID) from the hydraulic oil cooler. Loosen the hose clamp
and remove tube (1H)

8. Remove fan guard assembly (12) from the machine

9. Remove the four shield assemblies (1) from the radiator and guard. Remove the two side baffle assemblies
that are behind the shield assemblies.
 d

10. Loosen hose clamp (L5). Remove the bolts that hold elbow (16) to the radiator and remove elbow (16) and
the gasket.

ff, Remove the bolts and clamps (4) from the radiator lower mounts on each side of the machine

12. Remove guards (7) and (18) from the machine

13. Disconnect the wiring harness for the lights at connection (I9). Remove the nut and clip (20) from around
the wiring harness.

4. Remove baffle assemblies (21) and (22) from the machine

15. Remove the bolts and clamp (2) from the lower hydraulic oil cooler mount
l6. Fasten a hoist to the radiator with tools (A) as shown. Remove bolts (24) from each side and remove the
radiator and hydraulic oil cooler from the machine as a unit. The weight of the unit is 400 lb. (180 kg)-

Install Radiator And Hydraulic Oil Cooler

Tools Needed A
5P9736 Bracket-Link 2

1. Fasten a hoist to the radiator and hydraulic oil cooler with tools (A) and put the unit in position on the

�
machine. Install the bolts to hold the radiator top tank to the radiator guard.

' -t,.. .

I,
I
2. Install the two clamps (2) to hold the lower radiator tank in position.

3. Put the gasket and elbow (3) in position. Install the bolts to hold elbow (3). Move the water pump hose into
position and tighten clamps (1).
4. Install clamps (4) and the rubber mount to hold the lower end of the hydraulic oil cooler in position.

5. Install baffle assembly (5)

6. Install baffle assembly (6)

7,Connect the wiring harness for the lights at connection (7). Install clip (8) to hold the wiring harness in
position
. .
......
�

'

' ,
-en,
8. Install guards (9) and (10) on the radiator guard.

9. Install the two side baffle assemblies and put lower shield assembly (L2) in position,

10. Make sure the O-ring seal is installed in the end of tube (13) and put clean hydraulic oil on it, Put tube (13)
in position and connect it to the lower end of the hydraulic oil cooler with flanges(I1).
1. Install the three shield assemblies (14)

12. Install guard assembly (15) over the fan.

.. iv

L
13. Make sure the O-ring seal is installed in the end of tube (I6) and put clean hydraulic oil on it. Put tube (16)
in position and connect it to the upper end of the hydraulic oil cooler with the flange and bolts.

14. Install the four plates (17) on the shield assemblies over tubes (13) and (16)

15. Push hoses (18) and (19) on tubes (13) and (16) and tighten the clamps.
16. Install the gaskets, elbows (20), (21) and the hose to connect the radiator top tank to the cylinder head.

17. Install panel assemblies (22) on each side of the machine.

18. Fill the cooling system with coolant to the correct level. Fill the hydraulic tank with oil to the correct level.

end by:

a) install hood

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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

966 WHEEL LOADER VEHICLE SYSTEMS
Media Number -REG01118-02 Publication Date -01/04/1980 Date Updated -10/10/2001

Lift Arms
SMCS -6119-11; 6119-12

Remove Lift Arms

Tools Needed A B C D
7F9540 Hydraulic Puller 1 1
9$5559 Stud 1 1
1P543 Nut 1 1
5P6541 Sleeve 1
5P3100 Pump Group
(or electric) 1 1 1 1
9$5558 Stud 1 1
1P544 Nut 1 1
5P2998 Hydraulic Puller
Assembly 1 1
5P6541 Sleeve 1
9S5564 Sleeve 1
1P1838 Pulling Adapter 1
9$5565 Sleeve 1
1P1833 Pulling Adapter 1

start by:

a) remove tilt levers and link assemblies

1. Remove bolts (I) and nuts that hold pins (2) in the lift arms.

2. Remove pins (2) from the lift arms and lift cylinders

NOTE; If necessary, use tooling (A) to remove pins (2)

3. Remove lift kickout bracket (3) and cam from the lift arms as a unit.

4. Remove bolts (4) and nuts that hold pins (5) in the front frame

5. Fasten a hoist to the lift arms. Remove pins (5) from the lift arms and front frame.

NOTE; If necessary, use tooling (B) to remove pins (5)

6. Remove lift arms (6) from the front frame. The weight of the lift arms is 2300 1b, (1035 kg)

7.Remove four lip seals (7) (one from each side of the lift arm pin bores)

8. Use tooling (C to remove bearing (8) from the lift arm pin bores. See SPECIAL INSTRUCTION Form No.
GMG00806 for the correct use of the pulling adapter in tooling (C)

9. Remove eight hip seals () (one from each side of the bucket and front tilt lever pin bores).
10. Use tooling (D) to remove four bearings (10) from the bucket and front tilt lever pin bores. See SPECIAL
INSTRUCTION Form No. GMG00806 for the correct use of the pulling adapter

Install Lift Arms

Tools Needed A B C D E F
1P1833 Pulling_Adapter 1
9$5559 Stud 1
1543 Nut 1
5P3100 Pump Group_(or electric) 1 1
7F9540 Hydraulic Puller 1
1P510 Driver Group 1
9$5558 Stud 1
1544 Nut 1
5P2998 Hydraulic Puller Asserby 1
1P1838 Pulling_Adapter 1
1P520 Driver Group 1
9$5562 Cap-Pin Driver 1
9$5563 Cap-Pin Driver 1

1. Use tooling (A) to install the bearings in the bucket and front tilt lever pin bores. Install the bearings to a
depth of .311 ± .059 in. (7.9 ± 1.5 mm) below the surface of the lift arms. See SPECIAL INSTRUCTION Form
No. GMG00806 for the correct use of the pulling adapter in tooling (A)

2. Use tooling (B) to install eight lip seals (one on each side of the bearing for the bucket and front tilt lever pin
bores). Install the seals with the lip away from the bearing.
3. Use tooling (C) to install the bearings in the lift arm pin bores. Install the bearings to a depth of 374 ± 059 in.
(9.5 ± 15 mm) below the surface of the lift arms. See SPECIAL INSTRUCTION Form No. GMG00806 for the
correct use of the pulling adapter in tooling (C)

4. Use tooling (D) to install the lip seal on each side of the lift arm pin bores. Install the seals with the lip away
from the bearing

5. Put 5p960 Multipurpose Type Grease in all the pin bores and on the lip of all the seals

6. Fasten a hoist to the lift arms. Put lift arms (I) in position on the front frame.

7. Install pins (2) in the front frame and lift arms. Install the bolts and nuts that hold the pins in the front frame.

NOTE: If necessary, use tool (E) and a hammer to install pins (2)

8. Install hift kickout bracket and cam on the lift arms as a unit
9, Put the bores of the lift cylinders (4) in alignment with the bores in the lift arms. Install pins (3). Install the
bolts and nuts that hold the pins in the lift arms

NOTE: If necessary, use tool (F) and a hammer to install pins (3)

end by:

a) install tilt levers and link assemblies

Coo»ti9ht
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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

3306 VEHICULAR ENGINE FOR 966C WHEEL LOADER
Media Number -REG01116-02 Publication Date -01/05/1980 Date Updated -10/10/2001

Oil Filter Base

SMCS-1306-15; 1306-11; 1306-12

Remove Oil Filter Base

Tools Needed A

2P8250 Strap Wrench 1

1. Remove oil filter with tool (A)

2. Remove oil filter outlet line (3).

3. Remove oil filter inlet line (2).

4. Remove bolts that hold the base to the oil cooler.

5. Remove the oil filter base ( 1 ).

Install Oil Filter Base

Tools Needed A

I 2P8250 Strap Wrench

'

1. Put the oil filter base (I) in position on the oil cooler.

2. Put lubricant on the O-ring seals. Install the inlet and outlet lines for the oil filter base.

3. Install oil filter (2) with tool (A).

Disassemble And Assemble Oil Filter Base

start by:

a) remove oil filter base

• Remove bolts (D), covers (2) and (5) from the oil filter base

2. Remove the springs and plungers from the oil filter base
3. Make sure all of the parts are clean and put clean engine oil on them.

4. Install plunger (4), spring (3), cover (2) and bolts (1) of the bypass valve for the oil cooler in the oil filter base.

5. Install plunger (7), spring ( 6), cover ( 5) and bolts of the bypass valve for the oil filter in the oil filter base.

end by:

a) install oil filter base

Copyright 1993- 2022 Caterpillar Inc. Tue Mar 01 2022 18:24: 16 GMT +0700 (Indochina Time)
All Rights Reserved.
Private Network For SIS Licensees.
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[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Specifications
966 WHEEL LOADER POWER TRAIN
Media Number -REG01437-00 Publication Date -01/08/1973 Date Updated -10/10/2001

Final Drive
SMCS-1306-15; 1306-11; 1306-12

I
c
_ _.'__�-�----�-
<

-,

3 4 T95814X4

Wheel Bearing Adjustment:

1. Put an 8.00 in. (203.2 mm) torque wrench on wheel stud (4).

2. Tighten nut(!) while turning wheel (2) to a torque of 160 ± 50 lb. in. (184.5 ± 57.7 cm.kg). This torque
reading must be held through one complete revolution of wheel (2). If necessary, do the procedure again to get
the correct torque.

3. After getting the correct preload on bearings (3), loosen nut (I). Again, tighten nut (1) while turning wheel (2)
to a torque of 75 ± 25 lb. in. (86.5 ± 28.8 cm.kg) for one complete revolution.
4. Tum the nut to the next groove and lock in place.

5. Torque for the bolts that hold the carrier to the wheel ... 195 ± 18 lb. ft.(26.9 ± 2.5 mkg)

Copyright 1993- 2022 Caterpillar Inc. Tue Mar 01202218:24:30 GMT+0700 (Indochina Time)
All Rights Reserved.
Private Network For SIS Licensees.
 -momma· El Serice lnformation System I Shutdown SIS I
[ Previous Screen I
«Product: WHEEL LOADER
Model: 966C WHEEL LOADER 78G
Configuration: 966C WHEEL LOADER 78G01001-02870 (MACHINE)
POWERED BY 3306 ENGINE

Disassembly and Assembly

966 WHEEL LOADER VEHICLE SYSTEMS
Media Number -REG01118-02 Publication Date -01/04/1980 Date Updated -10/10/2001

Steering Cylinders
SMCS - 4303-15; 4303-16; 4303-11; 4303-12

Remove Steering Cylinders

start by:

a) connection of anti-pivot link

A, WARNING
Stop the engine, lower the bucket to the ground, move the control levers
backward and forward to release the pressure in the hydraulic system.
Slowly loosen the cap to release any pressure in the hydraulic tank. Let
the hydraulic oil become cool before any lines are disconnected in the
hydraulic system.

1. Drain the oil from the hydraulic tank.

2. Remove bolt (I) and the large washer.

3. Install washers (2) as needed. Install bolt. Hit the bolt with a hammer to loosen the taper on the pin. Remove
the pin.

4. Remove four washers (), two on each side of the cylinder rod.

5. Disconnect hydraulic line (9)

6. Remove pin (5) from the head of steering cylinder.

7, Disconnect hydraulic line (6) from the steering cylinder.

8. Connect a hoist to the bores at the rod and head ends of cylinder(7)
9. Move the cylinder toward the back and out of the machine. The weight of the cylinder is 120 1. (54 kg

Install Steering Cylinders

1. Put cylinder (I) in position in the machine

2. Install four washers (2) between the frame and the cylinder rod.

3. Put pin (3) in position and install the washer and bolt. Tighten the bolt to a torque of 150 ± 20 1b.ft. (205 ± 25
Nm)

4. Install the pin, washer and bolt in the rear bore. Tighten the bolt to a torque of 150 ± 20 1b.ft, (205 ±25 Nm).

NOTE; Make sure the O-ring seals are in position in lines (4) and (5)
5. Put line (4) in position and install the flanges and bolts.

6. Connect line (5).

7, Fill the hydraulic tank to the correct level with hydraulic oil. See LUBRICATION AND MAINTENANCE
GUIDE.

end by:

a) separation of anti-pivot link

Disassemble Steering Cylinders

 Tools Needed A B C
7r9540 Hydraulic Puller 1
1P1833 PungAapte! 1
396224 9MP OrOp tor iectc) 1 f
9$5559 Stud 1
1P543 Nut 1
9$5565 Sleeve Assemo f
• hydraulic Oner nepair Stan_1 f
FT948 Bracket f
1P850 Torque Multiplier f
1P851 spline Adaptor f
1P852 Male Adapter f
5$6077 Socket f

Information on this tool is available from:

Wolff Mfg. Co.
161I Adrian Rd.
Burlingame, Ca. 94010
start by:

a) remove steering cylinders

' d
•,

1. Remove seals (I) from the rod end of the cylinder.

2. Put tooling (A) in position and remove the bearing

3. Do Steps I and 2 for the head end of the cylinder if necessary

4. Fasten the rod end of steering cylinder (2) to tooling (B)

5. Slowly extend the cylinder to drain the oil from the cylinder

6. Install support (5) under the rod and fasten strap (4) to hold the rod on the support.

7,Remove head bolts (3). Pull the cylinder away from the rod and head with tooling ()

d
z
8. Use tooling (C) to remove the nut that holds the piston on the rod

9. Remove piston (6) from the rod.

10. Remove seal assembly (8) and wear sleeve (7) from the piston
1. Remove head (9) from the cylinder rod.

-
12. Remove O-ring seal (10) and back-up ring (H) from the head.

13. Remove seals (12),(13) and (4) from the cylinder head

Steering Cylinders
Assemble Steering Cylinders
 Tools Needed A BCD EFG H
1Pst0 Driver Group 1
• Hydraulic Cyfinder
epair Stang f
FT948 Bracket 1
3$6224 Pump Group
(or electric) 1 1
5P320 Seal Guide I
4$9181 Seal Egan! I
IP850 Torque Multiplier f
1P851 Spline Adapter 1
1P852 Male Adapter 1
65$6077 Socket f
4$9446 clamp_Assemby 1
9$5565 sleeve Assembly f
1P543 Nut 1
985559 Stod 1
7F9540 ydrauic Purer 1
1P1833 Pog Adaptor f
1P5to Driver Group 1

Information on this tool is available from:

Wolff Mfg. Co.
1611 Adrian Rd.
Burlingame, Ca. 94010
 2

A46286X2

TVPICAL EXAMPLE

1. Install inner seal (4) in head (1). The inner seal does not have a lip and can be installed either way. Install
middle seal (3) with the lip in. Use tooling () and install outer seal (2) with the lip out. Put clean oil on the
seals.

NOTE: For correct installation of all O-ring seals and seals, see illustration A46286X2 on this page.

2. Install back-up ring (5) and O-ring seal (6) on the head with the back-up ring away from the oil in the
cyhnder.

3. Put tooling (B) in position on rod (7) and install the cylinder head. Remove tooling ().
4. Use tool (D) to cause expansion of plastic seal (8) that is part of the piston seal assembly

5. Install wear ring (8) on the piston

6. Install piston (9) on the cylinder rod.

�
s
-·
I

: a
7
'
A ....
�

7. Install nut (10) that holds the piston in place.

8. Put tooling (E) in position and tighten nut (10) to a torque of 1200 ± 120 1b.ft. (1620 ± 160 Nm).

9. Put tooling (F) in position around the seal assembly on the piston.

10. Use tooling (C) and install the piston and rod into the cylinder. When the seal assembly has started into the
cylinder, tooling (F) can be removed.

1. Put the cylinder head in position. Install bolts (1H).

12. With the rod fully extended, tighten bolts (ID) to a torque of 150 ± 20 lb.ft. (205 ± 25 N·m)

13. Install the bearings with tooling (G) until the bearings are in the center of their bore.

14. Use tooling (H) to install the seals to a depth of .06 in. (1.52 mm) below the surface. Make sure the lip of the
seal is toward the outside as shown

end by.
a) install steering cylinders

Copyright 1993- 2022 Caterpillar Inc. Tue Mar 01 2022 18:24:44 GMT+0700 (Indochina Time)
All Rights Reserved.
Private Network For SIS Licensees.