Caterpillar Cat 936F WHEEL LOADER (Prefix 9MK) Service Repair Manual (9MK00001 and up).pdf

Service Repair Manual
Models
936F WHEEL LOADER

Shutdown SIS
Previous Screen
Product: WHEEL LOADER
Model: 936F WHEEL LOADER 9MK
Configuration: 936F WHEEL LOADER 9MK00001-UP (MACHINE) POWERED BY 3304 ENGINE
Disassembly and Assembly
936F WHEEL LOADER POWER TRAIN
Media Number -SENR5236-03 Publication Date -01/07/2003 Date Updated -18/08/2003
SENR52360013
Axle Shaft Assemblies
SMCS - 3268-010
Disassemble & Assemble Axle Shaft Assemblies
Start By:
a. remove front axle housing group (fixed)
b. remove rear axle housing group (oscillating)
NOTE: The axle shaft assemblies used in the front and rear axle housing groups are similar. The
removal, disassembly, assembly and installation procedures are the same for both axle groups.
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936F WHEEL LOADER 9MK00001-UP (MACHINE) POWERED BY 3304 ENGIN...
2020/4/15
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Typical Example
1. Install the axle housing group on Tool (G) in a vertical position as shown.
2. Fasten Tool (A) and a hoist to the rim flange of the axle shaft as shown. Remove twenty six
bolts (1) and the washers that hold axle shaft assembly (2) to the differential housing. Carefully
remove the axle shaft assembly. The weight of the axle shaft assembly is approximately 295 kg
(650 lb).
3. 3. Remove the bottom half of the axle housing group from Tool (G). Install axle shaft assembly
(2) on Tool (G) with planetary carrier assembly (5) facing up as shown.
NOTE: To completely remove retaining ring (3) from the axle shaft assembly, planetary carrier
assembly (5) must be removed and disassembled.
4. Use Tool (B) to remove retaining ring (3) from the groove in the end of axle shaft (4). Position
the retaining ring in the planetary carrier.
5. Fasten Tool (C) and a hoist to planetary carrier assembly (5) as shown. Remove the planetary
carrier assembly from the axle shaft housing. The weight of the planetary carrier assembly is
approximately 80 kg (175 lb).
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6. Disassemble planetary carrier assembly (5) as follows:
a. Using a hammer and punch, push spring pin (7) all the way into shaft (6).
b. Remove shaft (6), thrust washers (11) and (8) and planetary gear (10) from the carrier.
c. Remove bearing (9) from planetary gear (10).
d. Remove spring pin (7) from shaft (6) with a hammer and punch.
e. Remove the other two planetary gears (10) from the carrier as in Steps 6a through 6d.
f. Remove retaining ring (3) from the carrier.
The axle shaft housing has been removed from the axle shaft for better photo illustration of mounting the axle shaft to
Tool (G).
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7. Fasten the rim flange of the axle shaft to Tool (G) with suitable size bolts as shown in Photo
C42124P1. Installation of the bolt will prevent the axle shaft from turning when bearing nut (12)
is removed. Use Tooling (D) to remove bearing nut (12) from the axle shaft.
8. Fasten Tooling (A) and a hoist to the axle shaft housing as shown. Put slight lifting tension on
the axle shaft housing.
NOTE: The bearing cone which is located under bearing nut (12) will be removed at the same
time that the axle shaft housing is being removed from the axle shaft.
9. Fasten Tool (E) to the axle shaft housing as shown. Put a hand operated hydraulic jack between
Tool (E) and the end of the axle shaft as shown. Operate the hydraulic jack to push the axle shaft
housing and inner bearing cone off of the axle shaft. Remove the axle shaft housing and inner
bearing cone from the axle shaft. The weight of the axle shaft housing is approximately 105 kg
(231 lb).
10. Remove the inner bearing cone from the axle shaft housing.
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Typical Example
11. Remove inner bearing cup (13) from the axle shaft housing.
NOTICE
Ring gear (14) will be destroyed when it is removed from the axle shaft
housing.
12. Remove ring gear (14) from the axle shaft housing. Using a torch, cut the ring gear in two
place 180° apart. Cut the ring gear at the position of the locating dowels in the axle shaft housing.
An alternate method is to make three welds equally spaced around the circumference of the ring
gear to cause it to shrink. Remove the locating dowels for ring gear (14).
13. Remove Duo-Cone seal (15) and outer bearing cup (16) from the opposite end of the axle shaft
housing.
14. Remove Duo-Cone seal (18) and outer bearing cone (17) from the axle shaft.
NOTE: The following steps are for the assembly of the axle shaft assemblies.
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15. Fasten the rim flange of the axle shaft to Tool (G) with suitable size bolts as shown. Heat outer
bearing cone (17) to a maximum temperature of 135° C (275° F), and install the bearing cone on
the axle shaft as shown. Be sure the bearing cone is seated against the shoulder on the end of the
axle shaft. Allow the bearing cone and shaft to cool.
NOTICE
See, "Assembly And Installation Of Conventional Duo- Cone Seals" in
this module.
NOTE: The rubber seals and all surfaces that make contact with the seals must be clean and dry.
After installation of the seals, put clean SAE 30 oil on the contact surfaces of the metal seals.
16. Use Tool (F) to install the Duo-Cone seal in the end of the axle shaft.
17. Lower the temperature of outer bearing cup (16), and install it in the end of the axle shaft
housing as shown. Be sure the bearing cup is seated all the way down in the axle shaft housing.
NOTICE
See "Assembly And Installation Of Conventional Duo- Cone Seals" in
this module.
NOTE: The rubber seals and all surfaces that make contact with the seals must be clean and dry.
After installation of the seals, put clean SAE 30 oil on the contact surfaces of the metal seals.
18. Use Tool (F) to install the Duo-Cone seal in the end of the axle shaft housing.
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19. Lower the temperature of inner bearing cup (13), and install it in the opposite end of axle shaft
housing as shown. Be sure the bearing cup is seated all the way down against the shoulder in the
axle shaft housing.
NOTE: Dowels (19) are used to locate and hold ring gear (14) in position in the axle shaft
housing.
20. Locate the position of the ring gear in relation to the axle shaft housing by aligning the half
holes for the locating dowels. Put alignment marks on the ring gear and axle shaft housing to
ensure correct installation.
21. Lower the temperature of ring gear (14) to a temperature of -38° C (-36° F). Install dowels
(19) in the half holes on the outside diameter of the ring gear. Use an O-ring seal or rubber band to
hold the dowels in position.
22. Using a press, install ring gear (14) in the axle shaft housing. Install the ring gear with the
chamfered side down. As the ring gear is being pressed into the axle shaft housing, it will be
necessary to tap dowels (19) down along with the ring gear. After installation, the ring gear should
be even or slightly below the machined surface of the axle shaft housing. The dowels must be
flush with the ring gear.
23. Put a thin coat of clean SAE 30 oil on the outer bearing cone on the end of the axle shaft and
on the contact surfaces of the Duo-Cone seal on the end of the axle shaft and in the axle shaft
housing. Fasten Tool (A) and a hoist to the axle shaft housing as shown. Lower the axle shaft
housing on to the axle shaft.
7/10
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24. Heat inner bearing cone (20) to a maximum temperature of 135° C (275° F). Install the inner
bearing cone on the axle shaft with slight end play remaining. After the inner bearing cone cools,
lubricate it with clean SAE 30 oil.
NOTICE
The adjusting nut (12) must be installed with side that has the part
number facing away from inner bearing cone (20).
25. Put clean SAE 30 oil on bearing nut (12). Install bearing nut (12) on the axle shaft. Tighten the
nut until only a small amount of end play remains in the axle shaft assembly.
26. Measure the torque required (also called "Seal Drag Torque" or SDT) to rotate the axle
housing as follows:
a. Install a nut and bolt through one of the outer mounting bolt holes in the axle housing.
b. Install a 203 mm (8 in) torque wrench on the bolt installed in Step 26a so that it is in line with
the center of the axle shaft.
c. While turning the axle housing with the torque wrench, note the reading on the torque wrench,
and calculate the actual seal drag torque with the following formula:
Where:
"SDT" is the actual seal drag torque (in N*m)
"C" is the reading on the torque wrench (in N*m).
"B" is the length of the torque wrench (in meters).
"A" is the bolt circle radius of the axle housing in meters and is equal to .213 m (8.836 in).
27. While turning the axle housing with the torque wrench, tighten bearing nut (12) until the
torque wrench reading calculated with the following formula is reached:
Where:
"C" is the reading on the torque wrench (in N*m).
"B" is the length of the torque wrench (in meters).
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"A"" is the bolt circle radius of the axle housing in meters and is equal to .213 m (8.386 in).
"T" is the rolling torque specification for axle bearing preload which is 4.3 to 5.5 N*m (38 to 50 lb
in).
"SDT" is the actual seal drag torque (in N*m) from Step 26.
28. Check to be sure there is zero end play in the axle shaft.
29. If the axle bearing preload rolling torque exceeds the specification, back off bearing nut (12)
by 1/8 turn, and reseat the bearing against the bearing nut. Perform Step 27 again.
30. Assemble planetary carrier assembly (5) as follows:
a. Install retaining ring (3) in the carrier.
b. Put clean SAE 30 oil on all parts of planetary carrier assembly (5).
c. Install bearing (9) in planetary gear (10).
d. Put thrust washers (11) and (8) on each side of planetary gear (10), and install the planetary
gear in the carrier.
e. Install shaft (6) in the carrier. Be sure the spring pin hole in the shaft is in alignment with the
spring pin hole in the carrier. Install a new spring pin in the carrier and shaft. Install the spring pin
slightly below the outside surface of the carrier.
f. Install the other two planetary gears in the carrier as in Steps 30a through 30e.
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31. Fasten Tool (C) and a hoist to planetary carrier assembly (5). Lower the planetary carrier
assembly into the axle housing. As the planetary carrier assembly is being lowered into position,
align the flat on the hub of the planetary carrier assembly with the flat on bearing nut (12).
32. Use Tool (B) to install retaining ring (3). Check to be sure the that the retaining ring is fully
seated in the groove in the axle shaft.
33. Remove axle shaft assembly (2) from Tool (G). Reinstall the bottom half of the axle housing
group on Tool (G).
34. Put 6V-6640 Sealant on the machined surface of the axle shaft housing and on the
intermediate housing assembly. Fasten Tool (A) and a hoist to the rim flange on the axle shaft. Put
axle shaft assembly (2) in position on the differential housing. Install twenty six washers and bolts
(1) that hold it. Tighten the bolts to a torque of 300 ± 40 N*m (220 ± 30 lb ft).
End By:
a. install rear axle housing group (oscillating)
b. install front axle housing group (fixed)
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Wed Apr 15 09:32:30 UTC+0800 2020
10/10
936F WHEEL LOADER 9MK00001-UP (MACHINE) POWERED BY 3304 ENGI...
2020/4/15

Shutdown SIS
Previous Screen
SENR52360014
Brake Groups
SMCS - 4250-010
Remove & Install Brake Groups
Start By
a. remove axle shaft assemblies
NOTE: The brake group used in the front and rear axle housing groups is the same.
1. Remove reaction plate (1).
2. Remove three springs (2), sun gear (3) and friction disc (4).
1/3
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Brake piston (5) must be removed from the intermediate housing
assembly with shop air pressure. The brake piston can come out of the
intermediate housing assembly with force during the removal
procedure. To prevent possible personal injury, the brake piston must
be retained in the intermediate housing assembly when applying shop
air pressure.
3. While retaining the brake piston, apply shop air pressure (free of water) of approximately 525
kPa (75 psi) to fitting (Y). Brake piston (5) will move up and out of the intermediate housing
assembly.
4. Remove seal (6) and seal assembly (7) with the back-up ring.
NOTE: The following steps are for the installation of the brake group.
NOTE: Lubricate all seals with SAE 30 oil.
5. Install seal (6) and seal assembly (7) with the backup ring. Seal assembly (7) consists of an L-
shaped seal and a back-up ring. Put the L-shaped seal with the flat side towards the differential.
Put the backup ring in position away from the differential.
2/3
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6. Install piston (5) in the intermediate housing assembly.
NOTICE
The continued use of the friction disc with 7.65 mm (.301 in) or less of
friction material (depth of oil groove) will result in accelerated wear.
Do not use the disc color as an indication for wear, the overall
thickness and groove depth are more important.
7. Inspect friction disc (4) for wear. Replace the friction disc if the friction material thickness is
7.65 mm (.301 in) or less. Immerse the friction disc in clean SAE 30 oil. Install friction disc (4),
sun gear (3) and three springs (2).
8. Install reaction plate (1).
End By:
a. install axle shaft assemblies
Copyright 1993 - 2020 Caterpillar Inc.
All Rights Reserved.
Private Network For SIS Licensees.
Wed Apr 15 09:33:26 UTC+0800 2020
3/3
2020/4/15

Shutdown SIS
Previous Screen
SENR52360015
Differentials & Pinion Assemblies
SMCS - 3254-015; 3254-016; 3280-017
Remove & Install Differentials & Pinion Assemblies
Start By:
a. remove front axle housing group (fixed)
b. remove rear axle housing group (oscillating)
1. Remove one of the brake groups from the axle housing group. See the topic, "Remove & Install
Brake Groups" in this module.
1/14
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2. Fasten a hoist to intermediate housing assembly (1) as shown. Remove the four bolts that hold
intermediate housing assembly (1) to the differential center housing. Remove the intermediate
housing assembly. The weight of the intermediate housing assembly is approximately 57 kg (125
lb).
3. Remove bolt (2) and washer (3). NOTE: Two different size adjusting nuts are used in the bevel
gear group. Use Tool (E) or (F) to remove the appropriate size adjusting nuts.
NOTE:
4. Use appropriate Tool (E) or (F), to remove adjusting nut (4). Remove the pin, sleeve (6) and
bearing cup (7) from intermediate housing assembly (1).
5. Remove two of the bolts (8), located 180° apart from each other, that hold the pinion assembly to
the differential center housing. Install two suitable size guide bolts that are approximately 152.4 mm
(6.00 in) long in the bolt holes as shown.
2/14
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6. Remove the remaining bolts (8) that hold the pinion assembly to the differential center housing.
Slide the pinion out on the guide bolts far enough to install Tool (A). Fasten a hoist to the pinion
assembly as shown.
7. Remove the pinion assembly from the differential center housing. The weight of the pinion
assembly is approximately 66 kg (145 lb). Remove the shims and O-ring seal from the pinion
housing.
8. Fasten Tool (A) and a hoist to the differential a shown. Carefully lift the differential out of the
differential center housing. The weight of the differential is approximately 109 kg (240 lb)
9. Turn the remainder of the axle housing group over, and fasten it to the transmission repair stand.
Fasten Tool (B) and a hoist to the rim flange on axle shaft assembly (9) as shown. Remove twenty
six bolts (10) and the washers that hold the axle shaft assembly to the differential center housing.
Remove the axle shaft assembly. The weight of the axle shaft assembly is approximately 295 kg
(650 lb).
10. Remove the brake group from the differential center housing. See "Remove & Install Brake
Groups" in this module.
11. Repeat Steps 2 through 4 to remove and disassemble the other intermediate housing assembly
(1) that is on the differential center housing.
3/14
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12. Remove bearing cone (11) from the differential with Tool (C).
13. Turn the differential over, and remove bearing cone (12) with Tool (D).
14. Use a press to remove the four large spring pins and four small spring pins (13) from the
differential.
15. Remove twenty bolts (14) that hold bevel gear (15) in position. Using a press, remove bevel gear
(15) from the differential.
NOTE: The following procedure is for the installation of the differential and pinion assembly. Also,
the following procedure controls bearing preload and gives the same results for new or used
bearings.
16. Heat bevel gear (15) to a temperature of 135° C (275° F) for a maximum of four hours. Install
the bevel gear on the differential.
17. Install four large pins (13) partially into bevel gear (15). Install four small pins (13) into the
larger pins. Press the pins into bevel gear (15) until they are even with the outside surface of the
4/14
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bevel gear. Install twenty bolts (14) that hold the bevel gear to the differential. Tighten bolts (14) to
a torque of 95 ± 10 N*m (70 ± 7 lb ft). Tighten each bolt an additional 180 degrees ± 5 degrees.
Check to be sure the bevel gear is seated on the differential group shoulder.
18. Press bearing cone (11) and bearing cone (12) on the differential case. Check for full seating of
the bearing cones.
NOTE: Cup freezing or cone heating may be used if cups or cones are reset with a driver or press
after the parts have reached a uniform temperature. Limit cone heating to 135° C (275° F) maximum
for a maximum of 4 hours. Lubricate the bearings after they have cooled to prevent rusting.
19. Install bearing cup (7), sleeve (6) and the pin in the intermediate housing. Lubricate the threads
on adjusting nut (4), and install it in intermediate housing assembly (1).
20. Assembly the other intermediate housing (1) as in Step 19.
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21. Position the differential center housing on a transmission repair stand with the open side facing
upward. Fasten Tool (A) and a hoist to the differential, and lower it on to the three dowels in the
differential center housing.
22. Fasten a hoist to intermediate housing assembly (1). Install the intermediate housing assembly
on the differential center housing. Install and tighten the four bolts that hold it.
6/14
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NOTE: Use the original thickness of shims or a new shim pack measured to the same thickness as
the original pack. If the original shim pack is not available, use 70% of a new shim pack.
23. Lubricate and install the O-ring seal used on the pinion housing. Install the original shim pack on
the pinion housing. Install the two guide bolts in the differential center housing. Fasten Tool (A) and
a hoist to the pinion assembly, and install it in the differential center housing. Install twelve bolts (8)
that hold the pinion assembly in position. Tighten the bolts to a torque of 300 ± 40 N*m (220 ± 30 lb
ft).
NOTE: The shim pack thickness may have to be changed when adjusting the tooth contact pattern
between the bevel gear and pinion shaft.
24. Reposition the differential center housing on the transmission repair stand so the differential
center housing and the pinion assembly are horizontal (the same position as they are in the vehicle).
25. Tighten adjusting nuts (4) and (26) with Tool (E) and (F) to a position that maintains gear
backlash (but not tight gear mesh) and a slight bearing end play.
26. Measure the torque required to rotate the pinion shaft. Record the measured torque. Use a 1U-
6690 Socket on the pinion shaft nut for this measurement.
27. While rotating the pinion shaft back and forth, tighten adjusting nut (4) to zero backlash
position. Then back off adjusting nut (26) 20° plus the increment to the nearest lock position.
28. Tighten adjusting nut (4) while rotating the pinion shaft. Tighten nut (4) until a torque increase
of 0.2 to 0.6 N*m (2.0 to 5.0 lb in) over the torque recorded in Step 26 is measured. This is the
seated position
29. Tighten adjusting nut (4) 60° plus the increment to the nearest lock position.
7/14
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Pinion Shaft Spline (backlash measurement)
(A) Distance of dial indicator from pinion centerline.
NOTE: As a check for correct assembly and adjustment, the rolling torque of the bevel gear group
measured at the pinion shaft should be 1.4 to 2.4 N*m (13 to 22 lb in) for new bearings and 0.7 to
1.2 N*m (6 to 11 lb in) for used bearings.
30. Measure the backlash between bevel gear (15) and the pinion shaft. The backlash must be 0.25 +
0.10 - 0.08 mm (.010 + .004 -.003 in). Do this by placing a dial indicator (as shown) tangent to the
spline, making sure the yoke or spline adapter is tight to the spline.
31. The following chart gives examples of backlash at the pinion shaft, by showing the different
distances from the pinion centerline to the dial indicator:
32. If the backlash does not meet specifications, loosen one adjusting nut the same amount as the
opposite adjusting nut is tightened. This will maintain the bearing preload.
Illustration A
8/14
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33. After the backlash and preload adjustments have been made, the tooth contact between pinion
shaft and bevel gear (15) must then be checked. Do the procedure that follows:
a. Put a small amount of Prussian blue, red lead or paint on three or four adjacent teeth of bevel gear
(15).
b. Rotate the pinion shaft several revolutions in one direction and then several revolutions in the
opposite direction. Then turn pinion shaft in one direction until the marked teeth can be seen.
c. The correct area of tooth contact starts near the inside end of the teeth of bevel gear (15) and goes
a maximum of 50% of the length of the teeth. See Illustration A for an example of the correct area of
tooth contact.
Illustration A
34. If the tooth contact looks like the marks in Illustration B, do the procedure that follows:
a. Remove some of shims from behind the pinion housing.
b. Do Steps 29, 30 and 31 for the backlash adjustment procedure again.
c. Do Step 32 again.
Illustration A
35. If the tooth contact looks like the marks in Illustration C, do the procedure that follows:
a. Add shims behind the pinion housing.
b. Do Steps 29, 30 and 31 again.
c. Do Step 32 again.
NOTE: Always be sure the backlash adjustment is correct before an adjustment is made to the area
of tooth contact. Several adjustments to the backlash and tooth contact may be necessary to get the
correct adjustments. Always remember that a change to gear clearance (backlash) will also change
the gear contact. A change in gear contact will also change gear clearance (backlash).
9/14
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36. After adjustments are made, remove the Prussian blue, red lead or paint from the gears.
37. Install one bolt and lock (2) in each adjusting nut (4) and (26), tighten both bolts and bend the
locks.
38. Install the brake groups and the axle shaft assemblies on the differential center housing. See the
topic, "Remove & Install Brake Groups" and "Disassemble & Assemble Axle Shaft Assemblies" in
this module.
End By:
a. install rear axle housing group (oscillating)
b. install front axle housing group (fixed)
Disassemble Pinion Assemblies
Start By:
a. remove differentials and pinion assemblies.
NOTE: The disassembly procedure is the same for the front and rear pinion assemblies.
1. Remove six bolts (1) and the washers that hold retainer (2) to the pinion housing. Remove the
retainer.
2. Remove lip seal (3) from retainer (2).
10/14
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3. Bend crimp (4) away from the slot in the pinion shaft with a hammer and punch.
4. Use Tool (A) to remove nut (5) from the pinion shaft.
5. Using a press, remove pinion shaft (6) from the pinion housing.
6. Remove bearing cones (8) and bearing cups (7) from the pinion housing.
Assemble Pinion Assemblies
11/14
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Caterpillar Cat 936F WHEEL LOADER (Prefix 9MK) Service Repair Manual (9MK00001 and up).pdf

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Caterpillar Cat 936F WHEEL LOADER (Prefix 9MK) Service Repair Manual (9MK00001 and up).pdf