SUPPORT (L.H.) 4L6258 - Caterpillar

Note: A small amount of aluminum particles is normal.Probable Cause
Mechanical failure of the hoist and rear brake cooling gear pump (9). See "Check the hoist and rear brake cooling screens".Check: Check the hoist and rear brake cooling screens.
Illustration 14 g02793237
(14) Oil screen for the rear brake cooling (15) Oil screen for hoistRemove oil screens (14) and (15). Inspect screens (14) and (15) 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 screen or in the rear brake cooling screen
Illustration 15 g02792936
Pump for the torque converter, the parking brake release, and brake cooling. (5) Cover for the torque converter scavenge screen (6) Torque converter scavenge pump section (7) Torque converter charging pump section (8) Parking brake release pump section (9) Section for rear brake coolingNote: A small amount of aluminum particles is normal.Probable Cause
Mechanical failure of the hoist and rear brake cooling gear pump (9) .Check: Check the inside of the hydraulic tank.
Illustration 16 g02793281
(16) Suction screens for hoist and rear brake cooling oil (17) Suction screen for rear brake cooling oil (18) Suction screen for torque converter and parking brake release 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 (18), (16) and (17) 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, "Dealer Service Tool Catalog" for tools and supplies suitable to collect and contain fluids on Cat 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
Illustration 17 g02792936
Pump for the torque converter, the parking brake release, and brake cooling. (5) Cover for the torque converter scavenge screen (6) Torque converter scavenge pump section (7) Torque converter charging pump section (8) Parking brake release pump section (9) Section for rear brake cooling
Illustration 18 g02793319
(19) Oil pump drive (20) Hoist and rear brake cooling gear pumpProbable Cause
Mechanical failure of the torque converter scavenge pump section (6)
Mechanical failure of parking brake release pump section (8). See "Check the parking brake release hydraulic filter".
Mechanical failure of the torque converter charging pump section (7). See "Check the torque converter hydraulic filter".
Mechanical failure of oil pump drive (19). See "Check the torque converter scavenge screen".
Mechanical failure of rear brake cooling pump section (9). See "Check the torque converter and front brake cooling screen. Check the screens for the rear brake oil coolers.".Problem: Aluminum particles are found
Probable Cause
Mechanical failure of the torque converter. See "Check the torque converter scavenge screen".Problem: A large quantity of aluminum particles are found
Illustration 19 g02793319
(19) Oil pump drive (20) Hoist and rear brake cooling gear