Komatsu PC88MR-10 Shop Manual page 199

21. Flange
22. Counterbalance valve
23. Check valve
24. Check valve
Structure
Reduction gear system
Reduction gear (1) consists of 2-stage planetary gear mechanism and reduces the high speed rotation of
hydraulic motor (2) into low-speed and high-torque rotation.
Hydraulic motor
Hydraulic motor (2) is a swash plate type axial piston motor. It converts the energy of the pressurized oil
sent from the main pump into rotary motion.
Brake valve
Brake valve (3) consists of valves of various types and has the following functions.
Function of stopping hydraulic motor (2) smoothly
Function of preventing running away of hydraulic motor (2)
Function of preventing generation of abnormal pressure when hydraulic motor (2) is stopped suddenly
2-stage travel speed selector mechanism
2-stage travel speed selector mechanism (4) consists of the regulator valve and regulator piston and
changes the rotation speed to 2 levels by changing the displacement of hydraulic motor (2).
Parking brake
Parking brake (5) is a multiple disc type brake and integrated with hydraulic motor (2).
PC88MR-10
10 Structure and function
Travel motor
10-121