PC220-7 and straight travel.

mardi 1 novembre 2016

Hi guys.
An owner asks me to trobleshoot his PC220-7.
Problem: Machine doesn't travel straight!

I read hydraulic circuit and understand it. Who know what the most common cause of this problem?
- Travel pedal differnt pressure
- malfunction of steering switch
- malfunction of travel junction valve
- rotary connection ( swivel joint)
- leakage in travel motor.

Who has this experience?
Thanks.