| NOTICE |
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Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
Use the visual checks to troubleshoot a problem. Perform the checks with a stopped engine and with engaged parking brakes. During the checks, use a magnet to separate the ferrous particles from the nonferrous particles.
Check: Check the oil level in the final drive, and check the filler plug.
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| Illustration 1 | g01082211 |
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Location of the filler plug and the drain plug for the final drive (1) Filler plug (2) Drain plug | |
Remove filler plug (1). The filler plug is magnetic. Check the filler plug for metallic particles. Check the oil level in each final drive. When the oil level is checked, be certain that drain plug is down in the lowest position. Check for oil leakage on the tires and wheels. Refer to the Operation and Maintenance Manualfor the machine that is being serviced in order to determine the correct oil to use.
Problem: The filler plug has metal shavings.
- Mechanical failure of one or both of the final drives.
- Mechanical failure of any of the components that are located inside the axle housing.
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| Illustration 2 | g01082212 |
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Final drive and brake group (3) Duo-cone seal | |
- The brake cooling oil is leaking into the final drive. Duo-Cone seal (3) at the wheel brake has failed.
Note: To determine the wheel that is leaking, perform the test in the Braking System, Systems Operation, Testing and Adjusting, "Internal Brake Leakage - Check".
Problem: The oil level in a final drive is too low.
- Failure of the O-ring seal on the final drive housing.
Check: Check the oil level in the axle housings.
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| Illustration 3 | g01082213 |
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Location of the filter plug and the drain plug for the front axle housing (4) Filler plug (5) Drain plug | |
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| Illustration 4 | g01082215 |
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Location of the filler plug and the drain plug for the rear axle housing (6) Filler plug (7) Drain plug | |
Remove filler plugs (4) and (6) in order to check the oil levels in the front and rear axle housings. The oil level should be at the bottom of the filler plug opening. Check for leakage under the housings. Refer to the Operation and Maintenance Manual for the machine that is being serviced in order to determine the correct oil to use.
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| Illustration 5 | g01082212 |
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Final drive and brake group (3) Duo-cone seal | |
- The brake cooling oil is leaking into the final drive. Duo-Cone seal (3) at the wheel brake has failed.
Note: To determine the wheel that is leaking, perform the test in the Braking System, Systems Operation, Testing and Adjusting, "Internal Brake Leakage - Check".
Problem: The oil level in the axle housing is too low.
- Failure of the pinion seal in the differential.
Check: Inspect the final drives.
| NOTICE |
|---|
|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 6 | g01082211 |
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Location of the filler plug and the drain plug for the final drive (1) Filler plug (2) Drain plug | |
Remove drain plug (2) from each final drive in order to drain the oil. Remove the covers. Perform an inspection for damaged gears, bearings, etc.
Check: Inspect the differential and bevel gear.
| NOTICE |
|---|
|
Care must be taken to ensure that fluids are contained during performance of inspection, maintenance, testing, adjusting and repair of the product. Be prepared to collect the fluid with suitable containers before opening any compartment or disassembling any component containing fluids. Refer to Special Publication, NENG2500, "Caterpillar Tools and Shop Products Guide" for tools and supplies suitable to collect and contain fluids on Caterpillar products. Dispose of all fluids according to local regulations and mandates. |
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| Illustration 7 | g01082213 |
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Location of the filter plug and the drain plug for the front axle housing (4) Filler plug (5) Drain plug | |
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| Illustration 8 | g01082215 |
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Location of the filler plug and the drain plug for the rear axle housing (6) Filler plug (7) Drain plug | |
Remove drain plugs (5) and (7) in order to drain the oil from the front and rear axle housings. Remove filler plugs (4) and (6) and check the bevel gear and pinion for damage. Look in the bottom of the axle housings for metal chips.