Caterpillar Cat 926 and 926E WHEEL LOADER (Prefix 8NB) Service Repair Manual Instant Download.pdf

Service Repair Manual
Models
926 and 926E WHEEL LOADER

Shutdown SIS
Previous Screen
Product: WHEEL LOADER
Model: 926 WHEEL LOADER 8NB
Configuration: 926E WHEEL LOADER 8NB01542-02451 (MACHINE) POWERED BY 3204 ENGINE
Disassembly and Assembly
926 WHEEL LOADER VEHICLE SYSTEMS
Media Number -SENR3073-00 Publication Date -01/06/1985 Date Updated -11/10/2001
Hydraulic Pump
SMCS - 5055-010; 5055-015; 5055-016
Remove And Install Hydraulic Pump
START BY:
a. remove cab right side lower shroud
To prevent personal injury, release the pressure from the hydraulic
system before any hoses are disconnected or removed.
1. Drain the oil from the hydraulic tank. The capacity of the hydraulic tank is 53 liter (14 U.S.
gal.).
2. Remove right side rear fender.
3. Disconnect clip (1) that holds the wiring harness to the support.
4. Remove strip (2).
5. Remove tubes (3).
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926E WHEEL LOADER 8NB01542-02451 (MACHINE) POWERED BY 3204 ENGI...
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6. Thoroughly clean the tube connections at the hydraulic pump to prevent dirt entry into the
hydraulic pump.
7. Disconnect tubes (4), (5) and (6) at the hydraulic pump.
8. Remove the bolts that hold hydraulic pump (7) to the engine. Use two persons, and remove the
pump. The weight of the pump is 30 kg (66 lb.).
9. Put protective covers in the hydraulic openings.
NOTE: The following steps are for installation of the hydraulic pump.
10. Remove the protective covers, and install a new O-ring seal on the hydraulic pump.
11. Be sure the O-ring seals are in place in tubes (4), (5) and (6).
12. Install the hydraulic pump.
13. Install the right side rear fender.
14. Fill the hydraulic system with oil to the correct level. See the Maintenance Guide.
END BY:
a. install cab right side lower shroud
Disassemble Hydraulic Pump
START BY:
2/11
2021/2/20

a. remove hydraulic pump
1. For correct assembly of the parts, the pump rotation is in a clockwise direction as seen from the
shaft end (drive end) of the hydraulic pump. Mark the relative position of the pump sections
before disassembly.
NOTE: The pictures that follow show a pump with different orientation and rotation from the one
used on 926 Wheel Loaders. However, the service procedure is the same.
2. Remove four bolts (1) that hold cover (2) to cover (3). Remove cover (2) and the cartridge
assembly from the pump as a unit.
NOTE: Make a note of the direction of the arrows at locations (X) and (Y) and the location of
bolts (4) for assembly purposes. Arrows at locations (X) and (Y) show the direction of pump
rotation.
3. Remove cartridge assembly (5) and O-ring seal (6) from cover (2).
4. Remove seal ring (8) from the cartridge assembly.
5. Remove O-ring seal (7) and the back-up ring from the cartridge assembly.
3/11
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6. Remove bolts (4) and cover (9) from the cartridge.
7. Remove seals (10) and the retainers from cover (9).
8. Remove plate (11) from the cartridge.
9. Remove ring (13) and rotor assembly (12) from plate (14) as a unit.
10. Remove rotor assembly (12) from ring (13).
4/11
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11. Remove vanes (16) and inserts (15) from the rotor.
12. Remove plate (17) from end plate (14).
13. Remove seals (18) and the retainers from the end cover.
14. Remove bolts (19) and cover (20) from body assembly (21).
15. Remove cartridge assembly (22) and O-ring seal (25) from body assembly (21).
NOTE: Make a note of the direction of the arrows (23) nearest the bolts and the direction of the
arrow (24) on the ring for assembly purposes.
16. Do Steps 4 through 13 again for the disassembly of cartridge (22).
17. Remove spiral snap ring (27), and remove the shaft assembly from the body.
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18. Remove snap ring (28) from shaft (26).
19. Use tooling (A) and a press to remove shaft (26) from bearing (27).
20. Remove washer (29) and two lip-type seals (30) from the body.
21. Inspect all parts for wear or damage, and make replacements if necessary. If any parts with
alignment marks are replaced, put new marks in the same location on the new parts.
Assemble Hydraulic Pump
1. Put clean oil on all parts at assembly.
NOTE: For correct assembly of all parts, the pump rotation is in a clockwise direction as seen
from the shaft end (drive end) of the hydraulic pump.
2. Use tooling (A), and install lip-type seal in body (1). Install the seal with the lip down as shown.
6/11
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3. Turn body (1) over, and install the lip-type seal with tooling (A). Install the seal with the lip up
toward the cartridge assembly as shown.
4. Use tooling (B) and a press to install bearing (3) on shaft (2).
5. Install snap ring (4) that holds bearing (3) on the shaft.
6. Protect the seal lip with shim stock or plastic, and put washer (6) and shaft assembly (5) in
position in body (1). Remove the shim stock or plastic.
7. Install spiral ring (7) that holds shaft assembly (5) in body (1).
7/11
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8. Put O-ring seals (8) in position in plastic retainers (9). Install seal assemblies on end plate (10)
with the O-ring seal toward the end plate.
9. Put plate (11) in position on the end plate with the brass side up toward the rotor.
NOTE: When vanes (15) are installed correctly, the rear edge of each vane is next to the balance
opening (slot) in the rotor. The leading edge of each vane faces the direction of pump rotation
(arrow).
10. Install inserts (14) and vanes (15) in rotor (13). The sharp edge of the vanes must be in the
same direction as the arrow on the chamfer of ring (12). Each vane (15) must move freely in its
slot in the rotor. Each insert (14) must move freely in its vane (15).
11. Put a large rubber band around rotor (13) to hold the vanes and inserts in the rotor.
8/11
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12. Put rotor assembly (17) in position on plate (11) as shown. Be sure the sharp edge of the vanes
and the arrow on the chamfer of the ring are in the same direction.
13. Put ring (12) in position on plate (11) and end plate (10) as shown. The arrow on the chamfer
of ring (12) must be in the same direction as the rotation of the rotor.
14. Put plate (16) in position on the cartridge assembly. Make sure the brass side of the plate is
toward the rotor assembly. Also, make sure the notches on the outside diameter of plate (16) are in
alignment with the notches on plate (11) and the chamfers on ring (12).
15. Put O-ring seals (18) in position in plastic retainers (20). Install seal assemblies on plate (19)
with the O-ring seal toward plate (16).
16. Put plate (19) in position on the cartridge assembly as shown.
17. Install bolts (21) that hold plate (19) on the cartridge assembly. Install the bolts in the holes
nearest to the arrows on the plate that show the direction of pump rotation.
18. Install O-ring seal (24); then back-up ring (25) on the end plate of cartridge assembly (22).
19. Install seal ring (23) on the end plate of cartridge assembly (22).
20. Install cartridge assembly (22) on the shaft assembly.
9/11
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21. Install O-ring seal (28) in body assembly (1).
NOTE: Dowels (27) in the cartridge assembly must be aligned with the holes in cover (26).
22. Install cover (26) on body assembly (1). Use the original marks for alignment.
23. Install the bolts that hold the cover to the body, and tighten them to a torque of 95 ± 14 N·m
(70 ± 10 lb.ft.).
24. Do Steps 8 through 16 again for the assembly of cartridge (30).
25. Install cartridge assembly (30) in cover (29).
26. Install O-ring seal (32) in cover (29).
NOTE: Dowels (31) in the cartridge assembly must be aligned with the holes in cover (26).
27. Put cartridge assembly (30) and cover (29) in position on cover (26) as a unit. Use the original
marks for alignment.
10/11
926E WHEEL LOADER 8NB01542-02451 (MACHINE) POWERED BY 3204 EN...
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28. Install bolts (33) that hold cover (29) to the cover, and tighten them to a torque of 61 ± 7 N·m
(45 ± 4 lb.ft.).
END BY:
a. install hydraulic pump
Copyright 1993 - 2021 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Sat Feb 20 17:11:34 UTC+0800 2021
11/11
926E WHEEL LOADER 8NB01542-02451 (MACHINE) POWERED BY 3204 EN...
2021/2/20

Shutdown SIS
Previous Screen
Hydraulic Tank
SMCS - 5056-011; 5056-017
Remove And Install Hydraulic Tank
1. Remove the hood.
2. Remove the engine compartment doors.
To prevent personal injury, 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.
3. Drain the oil from the hydraulic tank. The capacity of the hydraulic tank is 53 liter (14 U.S.
gal.).
1/5
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4. Disconnect wire harness (1) from the hydraulic tank.
5. Remove the bolts and nuts that hold plate (2) to the hydraulic tank. Move plate (2) off the studs.
6. Disconnect hoses (3), (4) and (5) at the fittings on the hydraulic tank.
7. Fasten tooling (A), and a hoist to the hydraulic tank. The weight of the hydraulic tank is 104 kg
(230 lb.).
8. Remove support (6).
9. Disconnect tube assemblies (7) at the fittings on the hydraulic tank.
10. Remove bolts (8) that hold the hydraulic tank to the support.
2/5
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11. Lift hydraulic tank (9) straight up. Be careful not to damage the cab while removing the
hydraulic tank.
12. Put protective covers over the hydraulic openings.
13. Remove the protective plugs, and install the hydraulic tank in the reverse order of removal.
Tighten bolts (8) that hold the hydraulic tank to the support to a torque of 135 ± 15 N·m (100 ± 11
lb.ft.).
14. Fill the hydraulic tank to the correct level. See the Maintenance Guide.
15. Install the engine compartment doors.
16. Install the hood.
Disassemble And Assemble Hydraulic Tank
START BY:
a. remove hydraulic tank
1. Remove elbows (1), (2), (3) and (4) from the hydraulic tank.
2. Remove plate (5).
3/5
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3. Remove cover (6) and filter element (7).
4. Remove oil filter bypass valve (8).
5. Remove strainer (9) and strainer (10).
6. Inspect all parts, and replace as necessary. See Wheel Loader Hydraulic System Specifications
for filter bypass valve spring data.
NOTE: The sight glass can be removed if necessary. Tighten the screws to a torque of 24 ± 3 N·m
(18 ± 2 lb.ft.).
7. Tighten the filter element bolt to a torque of 56 ± 3 N·m (41 ± 2 lb.ft.).
8. Thoroughly clean the mating surfaces of the hydraulic tank and plate (5).
9. Assemble the hydraulic tank components in the reverse order as disassemble.
10. Peel the tape from a 300 cm (118 in.) piece of 3G4090 Sealant. Apply the sealant, adhesive
side down to the hydraulic tank. Apply sealant (11) to the area of the tank flange between the
inside edge of the flange and the holes. Overlap the ends of the sealant bead around a bolt hole as
shown.
11. Install plate (5) on the hydraulic tank.
4/5
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12. Install elbows (1), (2), (3) and (4) with new O-ring seals.
END BY:
a. install hydraulic tank
Sat Feb 20 17:12:30 UTC+0800 2021
5/5
2021/2/20

Shutdown SIS
Previous Screen
Air Dryer
SMCS - 4285-010; 4285-015; 4285-016
Remove And Install Air Dryer
To prevent possible personal injury, make sure all the pressure is
released from the air system before any lines are disconnected.
1. Disconnect two tube assemblies (1) and hose assembly (2).
2. Disconnect wire assembly (3).
3. Remove the two U-bolts, and remove air dryer (4).
NOTE: The following steps are for the installation of the air dryer.
4. Put the air dryer in position, and install two U-bolts (5). Tighten the nuts on the U-bolts to a
torque of 25 ± 7 N·m (18 ± 5 lb.ft.).
5. Connect wire assembly (3). Tighten the nut holding the wire to 0.50 ± 0.05 N·m (4 ± 0.4 lb.in.).
6. Connect hose assembly (2) and two tube assemblies (1).
1/7
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Disassemble Air Dryer
START BY:
a. remove air dryer
1. Remove two nuts (1), washer (2) and purge cap (3). Pull the cap off with a twisting, upward
motion.
2. Unscrew center shaft (5). The shaft has a heavy spring load and will release as the shaft is
removed.
3. Remove two seal washers (4), shaft (5), purge plate (6) and desiccant spring (7) from the filter
cartridge.
4. Remove desiccant canister (8) from the housing. If necessary, pry the canister out of the
housing by inserting a screw driver in the groove at the top of the canister.
2/7
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5. With the desiccant canister in an upright position, remove spiral lockring (9), retainer screen
(10) and cloth filter pad (11) from the desiccant canister.
6. Tip the open canister over, and pour out the desiccant.
7. Remove spiral lockring (14) from the bottom of canister (8), and remove deflector plate (15)
and oil separator pad (16).
8. Remove retaining ring (19), tube assembly (12) and retaining ring (18) from the canister.
9. Remove filter pad (17) and retainer screen (20) from the tube assembly.
10. Remove O-ring seal (13) from the canister.
NOTICE
The threads on purge valve assembly (21) are left hand threads. The
valve assembly must be rotated clockwise for removal.
NOTE: The entire purge valve assembly does not have to be removed for service. Center post
(26), spring (24) and purge valve (25) can be removed out the top of housing (22).
11. Rotate purge valve assembly (21) clockwise, and remove it from housing (22).
NOTICE
3/7
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Do not use a collapsible wrench such as a pipe wrench to loosen center
port (26) from the valve body. Damage to the internal thread port will
occur.
NOTICE
Do not apply a sideload to center port (26) during removal. The post
may bend.
12. Use a wrench on the flats on center port (26), and remove it from the valve body. Be careful
not to apply a sideload which may bend the post.
13. Remove spring (24) and purge valve (25) from the valve body. If necessary, use a screwdriver
inserter through the purge hole to remove the purge valve from the valve body.
14. Remove U-cup seal (23) from the valve.
Assemble Air Dryer
1. Inspect all seals and parts for wear or damage. Make replacements if necessary.
2. Make sure all parts are clean and free of dirt and foreign material. Lubricate all seals with clean
oil during assembly.
NOTICE
Do not use a collapsible wrench such as a pipe wrench to tighten center
post (4). Damage to the internal thread port will occur.
NOTICE
Do not apply a sideload to center post (4). The post may bend.
4/7
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3. Install seal (1) on valve body (5). Install seal (3) on center post (4). Install seal (7) and U-cup
seal (6) on purge valve (2). Make sure the "U" of the seal is facing down against the valve body
shoulder.
4. Install purge valve (2), spring (8) and center port (4) into valve body (5).
5. Use a wrench on the flats on center post (4) to tighten it. Do not apply a sideload which may
bend the post.
NOTICE
The threads on purge valve assembly (9) are left hand threads. The
valve assembly must be rotated counterclockwise for installation.
6. Install purge valve assembly (9) into housing (10). Install seal (11).
7. Install seal (13). Install retaining ring (18) in the groove closest to the top of canister (21).
8. Install retainer screen (20) and filter pad (17) on tube assembly (12). The filter pad must be
facing the desiccant.
9. Install tube assembly (12) into the canister, and fasten it in position with retaining ring (19).
10. Install oil separator (16) and deflector plate (15). Fasten them to the tube assembly with spiral
lockring (14).
5/7
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NOTE: Both filter pads must face the desiccant and completely cover their respective retainer
screws to prevent the desiccant from rubbing against the rough retainer screens.
11. Set canister (21) upright, and pour new, premeasured desiccant into the canister.
12. Jar the canister and tamp down the desiccant until the entire package is added to the canister.
13. Install filter pad (24) and retainer screen (23). Push the retainer screen down until spiral
lockring (22) can be installed.
14. Install the canister assembly into housing (10). Rotate the canister while installing, and be sure
that O-ring seal (13) seats below the housing shoulder.
15. Install two seals (28) on purge plate (26). Install desiccant spring (25), purge plate (26), seal
washer (29), center shaft (27) and seal washer (29).
6/7
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16. Install purge cap (32) with a downward twisting motion.
17. Install washer (30) and two nuts (31).
END BY:
a. install air dryer
Sat Feb 20 17:13:27 UTC+0800 2021
7/7
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Shutdown SIS
Previous Screen
Air Tank
SMCS - 4272-010
Remove And Install Air Tank
To prevent personal injury, release the pressure in the air tank before
any lines are disconnected.
1. Turn the valve on the bottom of the air tank to the "OPEN" position to release the air pressure
from the air tank.
2. Disocnnect air supply hose (1) to the air tank at the air compressor. Disconnect the two clips
that hold it.
1/2
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3. Remove hose (1). Remove hose (2) to the air compressor governor.
4. Remove tube (3) to the brake control valves.
5. Remove the clamps that hold air tank (4), and remove the tank.
6. Install the air tank in the reverse order of removal.
7. Check the operation of the air compressor governor and the air relief valve. See the respective
topics in Systems Operation Testing And Adjusting Air System And Brakes.
Sat Feb 20 17:14:24 UTC+0800 2021
2/2
2021/2/20

Shutdown SIS
Previous Screen
Brake Foot Control Valves
SMCS - 4265-016; 4265-011; 4265-012; 4265-015
1/7
2021/2/20

Remove Brake Foot Control Valves
START BY:
a. remove lower cab shrouds
b. remove windshield washer reservoir (only for removal of left brake foot control valve) *
c. remove brake pedal **
*
If only removing the left brake valve, remove only the front left hand shroud and the front shroud.
If only removing the right brake valve, remove only the right hand shroud and the front shroud.
2/7
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To prevent personal injury, release the pressure from the air reservoir
before any lines are disconnected.
NOTE: The procedure to remove the right brake valve and the left brake valve is the same, except
there are two less hose assemblies connected to the right brake valve. The left brake valve is
shown.
1. Put identification marks on hose assemblies for correct installation.
2. Disconnect hose assemblies (1), (2), (3) and (4) from the brake valve.
3. Put identification marks on wire assemblies (7) for correct installation. Disconnect wire
assemblies (7) from the brake valve.
4. Disconnect tube assembly (8) and hose assembly (6) from brake valve (5).
5. Remove three bolts (9) located inside the cab, and remove brake valve (5) from the machine.
**
This operation is in the Operator's Station, Disassembly And Assembly section.
3/7
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Install Brake Foot Control Valves
1. Put brake valve (1) in position under the cab, and install the three bolts inside the cab that hold
it in place.
2. Connect tube assembly (4) and hose assembly (2) to brake valve (1).
3. Connect wire assemblies (3) to the brake valve.
4. Connect hose assemblies (5), (6), (7) and (8) to the brake valve.
END BY:
a. install brake pedal *
b. install windshield washer reservoir (if only the left brake foot control valve was removed) *
c. install lower cab shrouds **
*
This operation is in the Operator's Station, Disassembly And Assembly section.
**
If only the left brake valve was removed, install the front left hand shroud and the front shroud.
If only the right brake valve was removed, install the right hand shroud and the front shroud.
4/7
2021/2/20

Disassemble Brake Foot Control Valves
START BY:
a. remove brake foot control valve
Retainer (3) holds spring (1) under compression. To prevent personal
injury, carefully remove the retainer.
1. Remove retainer (3), piston assembly (2) and spring (1) from the valve body.
2. Remove O-ring seal (5) from the piston.
3. Remove bolt (8) and the washer. Remove seat (7) and spring (6) from piston (4).
4. Use tool (A) to remove snap ring (9) and the washer.
5/7
2021/2/20

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5. Remove valve assembly (10) from the valve body. Remove the O-ring seal from the valve.
6. Remove screw (18) and the washer, diaphragm (17) and spring (16) from seat (15).
7. Remove valve (11) and spring (14) from the seat.
8. Remove O-ring seal (13) and retainer (12) from the valve.
Assemble Brake Foot Control Valves
1. Install the O-ring seal, retainer (4) and spring (2) on valve (3).
2. Put seat (1) in position on the valve. Install the spring, diaphragm, washer and bolt in the seat.
3. Install the O-ring seal in the valve body.
4. Install valve assembly (6), washer (7) and snap ring (8) in valve body (5). Use tool (A) to install
the snap ring.
6/7
2021/2/20

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