2. Cleaning and Inspection

Cleaning and Inspection

Front Case Half





1. Clean the front case half in cleaning solvent, and air dry.

Notice: Refer to Machined Surface Damage Notice in Service Precautions.

2. Remove the sealer from the case sealing surfaces.
3. Inspect the case for being broken or cracked.
4. Inspect the front output shaft front bearing bore (8) for:
^ Spun bearing
^ Cracks
5. Inspect the input shaft bearing bore (5) for:
^ Spun bearing
^ Cracks
6. Replace the front case half if any of the above is found.
7. Inspect the sealing surfaces (1) for damage.
8. Repair small scratches or nicks with a soft stone.
9. Inspect the front case to transmission case mounting surface for damage.
10. Inspect the case threaded bolt holes (2) for damage.
11. Repair any damaged threads.
12. Inspect the transmission to transfer case studs (4) for damage.
13. Replace any damaged studs.
14. Inspect the retaining ring (3) of the annulus gear to ensure it is properly seated.
15. Inspect the annulus gear (6) for the following:
^ Damage or wear
^ Chipped gear teeth
^ Debris embedded in the root of the teeth
16. Replace the front case half if the annulus gear is damaged.
17. Inspect the control actuator lever shaft bearing and seal (7) for the following:
^ Roughness
^ Pitted rollers
^ Seal torn or damaged
18. Replace the control actuator lever shaft bearing if it is faulty.
19. Inspect the location pins for being loose or missing.
20. Repair or replace any damaged location pins.
21. Inspect the front output shaft front bearing and the input shaft bearing for the following:
^ Roughness
^ Brinneling
^ Pitting
22. Replace the bearings if any of the above conditions are found.

Rear Case Half





1. Clean the rear case half in cleaning solvent, and air dry.

Notice: Refer to Machined Surface Damage Notice in Service Precautions.

2. Remove the sealer from the case sealing surfaces.
3. [inspect the case for being broken or cracked.
4. Replace the case if it is broken or cracked.
5. Inspect the sealing surfaces (1) for damage.
6. Repair small scratches or nicks with a soft stone.
7. Inspect the case threaded bolt holes for damage.
8. Repair any damaged threads.
9. Inspect the oil pump retainer (5) for wear or damage.
10. Replace the oil pump retainer if faulty.
11. Inspect the front output shaft rear bearing (4) for the following:
^ Roughness
^ Brinneling
^ Pitting
12. Replace the front output shaft rear bearing if any of the above conditions are found.
13. Inspect the rear output shaft bearing for the following:
^ Roughness
^ Brinneling
^ Pitting
14. Inspect for a spun bearing bore for the rear output shaft rear bearing.
15. Replace the case if a bearing has spun.
16. Inspect the retaining ring (2) for the rear output shaft rear bearing for being bent or twisted.
17. Replace a faulty retaining ring.
18. Inspect the rear output shaft bushing (3) for scoring or wear.
19. Replace a faulty rear output shaft bushing.

Oil Pump, 1st design





1. Remove the oil pump suction pipe and the connector hose from the oil pump screen.
2. Clean the pipe, hose, and screen in cleaning solvent and air dry.
3. If the screen is embedded with debris, replace the screen.
4. Inspect the hose for cracking or tears.
5. Replace the hose if it is faulty.
6. Inspect the oil pump for free movement.
7. Replace the oil pump if there is any binding. Do not disassemble the oil pump. The oil pump is serviced as a unit.





1. Clean the oil pump suction pipe, with the screen, in cleaning solvent and air dry. Do not remove the screen from the pipe.
2. If the screen is embedded with debris, replace the suction pipe assembly.
3. Inspect the oil pump for free movement.
4. Replace the oil pump if there is any binding. Do not disassemble the oil pump. The oil pump is serviced as a unit.

Rear Output Shaft





1. Clean the rear output shaft in cleaning solvent.
2. Clean the rear output shaft oil galleries (1), and air dry.

Important: Do not attempt to smooth any roughness in the bearing journals.

3. Inspect the input gear pilot bearing surface (2) and the clutch housing bearing surface (3) for the following:
^ Scoring
^ Pitting
^ Brinneling
^ Excessive wear
4. Inspect the rear output shaft splines (4) for damage or excessive wear. Witness marks at the location of the gears is normal.
5. Replace the rear output shaft if any of the above conditions are found.

Clutch Components





1. Do not clean the inner clutch discs (2) in cleaning solvent.
2. Inspect the inner clutch discs (2), with the friction material, for the following:
^ Worn friction material
^ Grooved or scored friction material
^ Warped
^ Burnt
3. Inspect the outer clutch discs (3) steel plates for being worn or warped.
4. Replace the clutch discs if any of the above conditions are found.
5. If 1st design, inspect the clutch backing plate (1) for wear.
6. If 1st design, replace the clutch backing plate if worn.




7. Clean the clutch pressure plate (4 and 6), the clutch pressure plate bearing (2) and the clutch pressure plate hub (1) in cleaning solvent and air dry.

8. Inspect the pressure plate bearing (2) for the following conditions:

^ Roughness

^ Brinelling

^ Pitting

^ Broken bearing cage

9. Replace the pressure plate bearing if it is damaged or worn.
10. Inspect the clutch pressure plate (4 and 6) for wear or damage.
11. Replace a faulty clutch pressure plate.

12. Inspect the clutch pressure plate bearing hub (1) for wear or damage.

13. Replace a faulty clutch pressure plate bearing hub.
14. Inspect for a damaged clutch return spring (5).
15. Replace a faulty clutch spring.





16. Clean the clutch housing, with the bearing, in cleaning solvent.
17. Air dry, and ensure all solvent is removed from the bearing.
18. Inspect the bearing for wear or damage.
19. Replace the clutch housing bearing if faulty.
20. Remove any burrs from the clutch housing disc teeth.
21. Inspect the clutch housing disc teeth for excessive wear. Excessive wear can be identified by the steps in the teeth, which prevents the clutch disc from moving freely.
22. Replace the clutch housing if the clutch disc teeth cannot be deburred.





23. Clean the clutch hub in cleaning solvent and air dry.
24. If 1st design, inspect the inner splines of the clutch hub for wear or damage.
25. If 1st design, inspect the rear output shaft to the clutch inner hub splines for excessive looseness.
26. If 1st design, inspect the clutch hub teeth for excessive wear. Excessive wear can be identified by the steps in the teeth, which prevents the clutch disc from moving freely.
27. If 1st design, replace the clutch hub if any of the above conditions are found.





28. If 2nd design, inspect the clutch disc surface (3) for excessive wear, warpage, or grooves
29. If 2nd design, inspect the rear output shaft to the clutch inner hub splines (1) for excessive looseness.
30. If 2nd design, inspect the clutch hub teet~ (4) for excessive wear. Steps in the teeth can identify excessive wear, which prevents the clutch disc from moving freely.
31. If 2nd design, inspect the clutch pressure plate tab slots (2) for excessive wear.
32. Replace the clutch hub if any of the above conditions are found.

High/Low Planetary Carrier

Important: The transfer case may use either a 4 pinion or 6 pinion planetary carrier assembly with the 27 tooth input gear version of the transfer case, transmission RPO M30. If the 6 pinion planetary carrier assembly used with the 27 tooth input gear requires replacement, the service part will be a 4 pinion planetary carrier assembly. The 4 pinion and 6 pinion planetary carriers are interchangeable. The 32 tooth input gear transfer case version used with transmission RPO MT1 and RPO MN8 will still use the 6 pinion planetary carrier assembly.





1. Clean the high/low planetary carrier in cleaning solvent. Do not disassemble the planetary carrier.
2. Air dry, and ensure all cleaning solvent is removed from the bearings in the planetary gears (3). Do not spin the planetary gears with compressed air.
3. Inspect the planetary gears for chipped teeth.
4. Inspect the planetary gears for debris embedded in the root of the teeth.
5. Inspect for a washer (4) being on each side of the planetary gears.
6. Inspect the low range teeth (1) for damage or excessive wear.
7. Inspect the thrust washer surface (2) for scoring or excessive wear.
8. Replace the high/low planetary carrier if any of the above conditions are found.
9. Inspect the high/low planetary thrust washers for excessive wear or scoring.
10. Replace the thrust washers if they are faulty.

Drive Chain and Sprockets





1. Clean the drive chain (1), drive sprocket (3), and driven sprocket (2) in cleaning solvent and air dry.
2. Inspect the drive chain (1) for the following:
^ Loose link pins
^ Binding or stiff links
^ Debris embedded in the links
^ Worn teeth surfaces
3. Replace the chain if any of the above conditions are found.
4. Inspect the driven sprocket (2) and the drive sprocket (3) for the following:
^ Chipped teeth
^ Excessive worn gear surfaces, slight wear marks are normal
^ Debris embedded in the root of the teeth
5. Replace the sprocket if any of the above conditions are found. The chain and sprockets may be replaced separately.

Front Output Shaft





1. Clean the front output shaft in cleaning solvent and air dry.
2. Inspect the teeth on the speed sensor reluctor wheel (3) for damage.
3. Replace the speed sensor reluctor wheel if it is damaged.
4. Inspect the front output shaft rear bearing race (1) for the following:
^ Scoring
^ Pitting
^ Brinneling
^ Excessive wear
5. Replace the faulty front output shaft rear bearing race.
6. Inspect the front output shaft splines (2) for damage.
7. Replace the front output shaft if it is damaged.

Input Gear





1. Clean the input gear, with pilot bearing, in cleaning solvent.
2. Air dry, and ensure all solvent is removed from the pilot bearing.
3. Inspect the pilot bearing (1) for the following:
^ Pitted
^ Wear
^ Corrosion
4. Replace the input gear pilot bearing if any of the above conditions are found.
5. Inspect the input gear engagement teeth (2) for chips.
6. Inspect the input gear for broken or damaged planetary teeth (3).
7. Inspect the input gear for debris embedded in the root of the teeth.
8. Inspect the input gear seal surface (4) for pitting or excessive wear.
9. Replace the input gear if any of the above conditions are found.

Shift System Components





1. Clean the following shift system components in cleaning solvent and air dry:
^ The high/low shift fork (1)
^ The range sleeve (2)
^ The clutch lever (3)
^ The shift fork shaft (4)
^ The control actuator lever shaft (5)
2. Inspect the shift fork shaft for straightness (4).
3. Replace the shift fork shaft if it is not straight.





4. Inspect the pads (2) on the shift fork for wear.
5. Replace the worn pads.
6. Inspect the roller (1) on the shift fork for wear.
7. Replace the shift fork if the roller is worn.





Important: Only disassemble the shift fork assembly if replacing a faulty component.

8. Inspect the following components of the shift fork assembly for wear or damage:
^ The bushing (1)
^ The springs (2)
^ The washer (3)
^ The outer bracket (4)
^ The shift fork (5)
^ The inner bracket (6)





9. Inspect the clutch lever roller (2) for the following:
^ Wear
^ Rotates easily
10. Inspect the clutch lever for worn wear pads (1).
11. Inspect the clutch lever for wear at the pivot pin holes (3).
12. Replace the clutch lever if the above conditions are found.





13. Inspect the range sleeve for chipped or excessive worn teeth (1).
14. Inspect the shift fork collar (2) on the range sleeve for wear.
15. Inspect the inner splines (3) of the range sleeve for excessive looseness on the input shaft.
16. Replace the range sleeve if the above conditions are found.





17. Inspect the shift fork roller slot (1) on the control actuator lever shaft for wear or roughness.
18. Inspect the bearing (2) and the seal surface on the control actuator lever shaft for the following:
^ Pitted
^ Wear
^ Corrosion
19. Inspect the clutch lever cam lobes (3) on the control actuator lever shaft for wear or roughness.
20. Replace the control actuator lever shaft if any of the above conditions are found.