PUMP-YM 3911102 - Caterpillar

Steering
PROBLEM: Machine will not turn in one direction. PROBABLE CAUSE: 1. Steering control linkage incorrectly adjusted or broken.2. Steering clutch release bearing failure. PROBLEM: Machine will not steer in either direction. PROBABLE CAUSE: 1. Improperly adjusted or broken control linkage.2. Low pump output. PROBLEM: Machine veers in either direction with both steering clutches engaged. PROBABLE CAUSE: 1. Incorrectly adjusted steering clutch linkage.2. Worn steering clutch plates.3. Weak or broken steering clutch springs.4. Broken steering clutch spring retaining bolts.5. Worn serrations on driving and driven steering clutch drums restricting clutch plate movement. PROBLEM: Sluggish steering. PROBABLE CAUSE: 1. Incorrectly adjusted, worn or broken steering linkage.2. Worn brake lining.3. Worn serrations on driving and driven steering clutch drums restricting clutch plate movement.4. Low pump output. Troubleshooting (Direct Drive)
This is intended as a reference for locating and correcting problems that may occur in the power train. In the event further investigation is necessary, use of the 7S8875 or 8M2736 Hydraulic Test Box will be helpful. Pressure tap locations and testing and adjusting procedures are defined in FLYWHEEL CLUTCH, TRANSMISSION AND STEERING CLUTCH HYDRAULIC TESTS in TESTING AND ADJUSTING. In all instances, visual checks of the machine should be made first and then operational checks.Visual Checks
1. Check the oil level of the transmission.2. Check the oil level of the final drives.3. Inspect all external oil lines and connections for leaks or damage.4. Check the flywheel clutch and transmission control linkages and steering and brake control linkages for damage and/or adjustment.5. Rotate the universal joint in both directions by hand. It should rotate freely except when cold oil causes drag. If it does not turn, disconnect the universal joint and determine if the transmission is locked.6. Check the magnetic strainer, filter and scavenge pump screen for foreign material. If metal particles are found, clean all components and recondition the damaged components.Operational Checks
With the engine running, move the transmission speed selector lever to all positions. Operate the machine in all speeds and both directions. Listen for unusual noises and determine their source.Operational Check List
Transmission
PROBLEM: Does not operate in any speed or slips in all speeds. PROBABLE CAUSE: 1. Flywheel clutch failure.2. Mechanical failure in transmission.3. Steering clutch failure.4. Bevel gear failure. PROBLEM: Operates in reverse speeds only or forward speeds only. PROBABLE CAUSE: