*843 Hydraulic lift and tilt slow

[Dr. Craig]

I just repaired a leaking left side lift cylinder with new seals etc. After running for about 1/2 hour lift and tilt function got weaker and weaker. It has not been a problem before. Fluid level is good, ran lift all the way up and down several times no change. Any ideas?

 

[biggie]

The aux. could be partially engaged, drawing hyd flow/power from the pump. Check that the aux spool, in the control valve is in neutral. Centering springs chould be broken.

 

[Dr. Craig]

The aux. could be partially engaged, drawing hyd flow/power from the pump. Check that the aux spool, in the control valve is in neutral. Centering springs chould be broken.

Aux is Ok, not engaged. Any other suggestions?

 

[OldMachinist]

Aux is Ok, not engaged. Any other suggestions?

Here are some possible causes
Air in system. Check to see if oil is foamy after running.
Low pressure. Put gauge on aux fitting to check. Should be around 2200 psi. Could have a piece of debris in relief valve.