ORIFICE 7C7480 - Caterpillar

Check: Check the hoist screens
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(17) Hoist screen (23) Bypass switchRemove hoist screens (17). Inspect hoist screens (17) for foreign material or for restrictions.Problem: Rubber particles are found
Probable Cause
Seal failure
Hose failureProblem: A large quantity of aluminum particles are found in the hoist screens
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(13) Pump drive (14) Hoist and rear brake cooling gear pumpNote: A small amount of aluminum particles is normal.Probable Cause
Mechanical failure of the hoist and the rear brake cooling gear pump (14) .Check: Check the inside of the hydraulic tank
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(20) Suction screen for torque converter and parking brake release oil (21) Suction screens for hoist and rear brake cooling oilDrain the oil from the hydraulic tank. Remove the outer cover from the hydraulic tank. Inspect the bottom of the hydraulic tank for debris. Remove the hoses from the back of the hydraulic tank in order to remove suction screens (20) and (22) and clean the suction screens.
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.
Problem: Rubber particles are found
Probable Cause
Seal failure
Hose failureProblem: Shiny steel particles are found
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784C Torque converter, parking brake release, and pulled unit brake cooling gear pump (7) Cover for the torque converter scavenge screen (8) Torque converter scavenge pump section (9) Torque converter charging pump section (10) Parking brake release pump section (11) Pulled unit brake cooling pump
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785C Gear pump that releases the parking brake and the torque converter (7) Cover for the torque converter scavenge screen (8) Torque converter scavenge pump section (9) Torque converter charging pump section (10) Parking brake release pump section
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(13) Pump drive (14) Hoist and rear brake cooling gear pumpProbable Cause
Mechanical failure of the torque converter scavenge pump section (8)
Mechanical failure of parking brake release pump section (10). See "Check the parking brake release hydraulic filter".
Mechanical failure of the torque converter charging pump section (9). See