426 cat backhoe

Johndeere9610

Ford guy

Joined

Jun 2, 2007

Messages

629

• Dec 15, 2010

• #1

I have a 426 backhoe that will not move it act likes the pump it in just isnt building pressure?

Any Ideas

 

C

cummins_255

New member

Joined

Sep 29, 2010

Messages

6

• Dec 15, 2010

• #2

have you hooked a pressure gauge to see what the line pressure is?

 

Johndeere9610

Ford guy

Joined

Jun 2, 2007

Messages

629

• Dec 16, 2010

• #3

No. But I can tell you that there is no pressure on the back pressure port.

 

4x4dually

Moderator

Joined

Jan 22, 2007

Messages

31,893

• Dec 16, 2010

• #4

Not knowing much about your particular setup, I'm assuming that it uses a positive displacement pump. If that is the case, could the relief valve be stuck open or damaged relieving all the pressure back to the tank?