PUMP GP-PISTON 3259789 - Caterpillar

Torque Converter
PROBLEM: Torque converter gets hot. PROBABLE CAUSE:1. Bad temperature gauge.2. Mechanical failure in torque converter.3. Core of oil cooler not completely open.4. Long periods of operation with converter at or near stall speed.5. Too much oil leakage in torque converter.6. Too much restriction in oil cooler lines.7. Not enough oil to torque converter because of: a. Oil pump failure.b. Too much oil leakage in transmission.c. Inlet relief valve not operating correctly.Steering
PROBLEM: Machine will not turn in one direction. PROBABLE CAUSE:1. Adjustment of steering control linkage not correct.2. Too much leakage in steering clutch control valve.3. Steering clutch discs or plates have wear or damage.4. Seals or steering clutch piston have damage. PROBLEM: Machine will not turn in either direction. PROBABLE CAUSE:1. Low oil pressure to steering clutch control valve.2. Leaks in control valve.3. Adjustments of control linkages for the steering clutches and brakes not correct.4. Steering clutch or clutches not releasing. PROBLEM: Machine moves in either direction when both steering clutches are engaged. PROBABLE CAUSE:1. Adjustments of the control linkages for the steering clutches and brakes not correct.2. Steering clutch discs or plates have wear or damage.3. Steering clutch springs that are weak or have damage.4. Studs that hold the steering clutch springs are broken.5. Splines on the steering clutch hubs have damage.6. Weak or broken springs in control valve. PROBLEM: Slow steering. PROBABLE CAUSE:1. Control linkages for the steering clutches and brake loose or adjustment not correct.2. Brake linings have wear or damage.3. Low oil pressure to steering clutch control valve.4. Splines on steering clutch hubs have damage.5. Leaks in steering clutch control valve.Troubleshooting - (Direct Drive)
Use this as a reference for the location and correction of problems in the power train. When more checks are necessary, use the 5P6225 Transmission Hydraulic Test Group. Use 5P5224 Pressure Gauge Kit to check steering pressure.Always make visual checks first. Then check the operation of the machine and go on to check with the instruments.Visual Checks
1. Check the oil levels of the flywheel clutch, trasmission and bevel gear case.2. Check the oil levels of the final drives.3. Check all oil lines, hoses and connections for leaks or damage. Look for oil on the ground under the machine.4. Check the control linkages for the flywheel clutch, transmission, steering clutches and brakes for damage and/or adjustment.5. With the flywheel clutch not engaged, turn the universal joint by hand. It must turn freely. If the oil is cold, the universal joint will be harder to turn. If the universal joint does not turn, disconnect it from the flywheel clutch. Turn the universal joint again and see if the gears in the transmission turn.6. Check the magnetic screen, oil filter and screen in engine flywheel housing for foreign materials.If you find metal or rubber particles, all components of the transmission hydraulic system must be washed clean. Do not use parts with damage. Use new parts.Checks During Operation
With the engine running, move the control levers for the transmission to all speed positions and the