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One for the Komatsu men

I

Irish in oz

Well-Known Member
Joined
Aug 21, 2013
Messages
56
Location
Ireland/Australia a.t.m
Occupation
fitter
On a Komatsu pw160 rubber duck (wheel excavator) has anybody ever come across a jumpy pilot system? All the controls go smooth then every couple of seconds give a bad jerk. It happens in both control levers and can be felt in the brake pedal too? It seems to be not as bad with the park brake applied?
 
M

mikebramel

Senior Member
Joined
Jul 15, 2012
Messages
1,612
Location
milwaukee
Irish in oz said:
On a Komatsu pw160 rubber duck (wheel excavator) has anybody ever come across a jumpy pilot system? All the controls go smooth then every couple of seconds give a bad jerk. It happens in both control levers and can be felt in the brake pedal too? It seems to be not as bad with the park brake applied?
Click to expand...

Make sure that the pump is not cavitating
 
T

The Learner

Well-Known Member
Joined
Jul 22, 2012
Messages
200
Location
SE Victoria Australia
Occupation
Hydraulic specialist
faulty park brake pilot system id guess
park brake is normally spring applied
so if fault occurs with park brake off id be looking for leaks or bypassing in park control system
 
M

MrElectric03

Well-Known Member
Joined
Jul 11, 2009
Messages
95
Location
Northern Idaho
I'd lean toward the pump as well. Also there are usually inlet screens in the banjo bolt on the ppc valves, check it and see if there is material blocking flow.
 
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