PISTON 1990599 - Caterpillar

Troubleshooting the Power Train
Problem: The transmission will not shift into any gear from the Neutral position
Probable Causes
Low battery voltage
Wiring harness connections
Transmission control (lever)
Electrical problem with the clutch pedal
Main relief valve
Transmission oil pump
Rotating seal leakage in the transmissionProblem: The transmission has lost a single gear
Probable Causes
The wiring harness for the transmission control
Transmission control (lever)
Electronic control moduleProblem: The motor grader has lost multiple forward/reverse gear selections
Probable Causes
Wiring harness
Solenoids
Transmission control (lever)
Electronic control module
Stations in the transmission control valve
Internal transmission problemProblem: The transmission slips
Probable Causes
Low oil pressure
Main relief valve
Valve for the centershift lock
Differential lock valve
Low clutch pressure
Solenoid
Driver in the electronic control module
Damage to the transmission control valve
Contamination in the transmission control valve
Rotating shaft seal
Rotating shaft O-ring
Worn clutch
Mechanical problem
The calibration of the clutch pedal
Proportional solenoid valves
Clutch piston sealProblem: The motor grader creeps when the clutch pedal is fully depressed
Probable Causes
Calibration for the clutch pedal
Proportional solenoid valves
Wiring harness for the proportional solenoid valves
Contamination in the proportional solenoid valve
Driver in the electronic control module
Internal clutch dragProblem: When the transmission shifts a hesitation occurs
Probable Causes
Low initial pressures on speed clutches
Low initial pressures on the clutches (range)
Contamination in the transmission control valve
Oil temperature sensor
Modulation orifice
Proportional solenoid valve
Calibration of the proportional solenoid valve
Drivers in the electronic control module
Speed sensors
Internal seal leakage on the transmission
Internal pump leakage
Main relief valve
Valve for the centershift lock
Differential lock valve
The oil viscosity has been changed and the transmission control valve has not been recalibrated.Problem: The transmission shifts are harsh
Probable Causes
Transmission speed sensor
Wiring harness for the transmission speed sensor
Oil temperature sensor
Proportional solenoid valve
Calibration of the proportional solenoid valve
Broken spring in the transmission control valve
A spool in the transmission control valve sticks.
The piston on a clutch sticks.
The oil viscosity has been changed and the transmission control valve has not been recalibrated.Problem: The transmission shifts are sluggish
Probable Causes
Slow clutch disengagement
The calibration of the clutch pedal
The calibration of the proportional solenoid valve
The parking brake drags.Problem: The transmission shifts at the wrong point when the autoshift control is in the ON position
Probable Causes
Transmission input speed sensor
Transmission output speed sensor
The electronic control module has the wrong transmission configuration code.Problem: The transmission does not shift into all the gears when the autoshift is in the ON position
Probable Causes
Transmission input speed sensor
Transmission output speed sensor
Transmission control
Transmission control is positioned below the programmed lowest gear.Problem: The transmission shifts into the wrong gear when the autoshift is in the ON position
Probable Causes
Transmission input speed sensor
Transmission output speed sensor