Allis Chalmers 170 bucket problem

[Waldershrek]

My grandfather gave me an Allis 170 with a bucket a few years ago that had been restored. It worked great and I've had no problems until recently. Lately with a load in the bucket, if I go to raise the bucket it makes a kind of screeching noise and goes up all jerky. I've checked the hydraulic fluid and it is full. The bucket is definitely not overloaded. What could be the problem?

 

[J_J]

Perhaps the screeching noise is the relief valve relieving. Put a gage in the circuit and do some logical trouble shooting. Only other screeching I can think of would be metal to metal contact.

 

[Leejohn]

Check your pickup screen and filter.

 

[Wayne County Hose]

Ditto. Almost all problems like this are on the suction side of the pump.

 

[Waldershrek]

The screeching noise definitely sounds like some dort of valve or something, not metal on metal. Does anybody know where the pickup screen and filter are located?