While the pump discharge pressure and LS differential
pressure are normal, if the following
faults occur, adjust the PC valve.
q When the load is increased, the engine
speed lowers.
q The engine speed is normal but the work
equipment speed is low.
1. Loosen locknut (2) of PC valve (1) and turn
adjustment screw (3).
a Before loosening locknut (2), be sure to
make match mark “a”.
a The PC valve is eccentric and it is uncertain
in which direction the absorption
torque is rotated to increase. Accordingly,
adjust while monitoring the engine speed.
2. After adjusting, tighten locknut (2). 3Locknut:
27.4 – 34.4 Nm {2.8 – 3.5 kgm}