Trebor 120D Mega - Manual (Page 26)

PAGE 26 MEGA 120D PUMP OPERATION / MAINTENANCE MANUAL
Erratic Cycling
Cause: Solution:
Leaking detent cap. Tighten and/or replace seal.
Supply line restricted (cavitation). Reduce fluid restriction.
Quick exhaust seal not seating. Check for particles between seal and port. Replace seal.
Pilot valve not following diaphragm
correctly. Pilot valve piston must slide freely, full travel in pilot valve
sleeve.
Replace damaged pilot valve assembly.
Check ball(s) not seating. Check O-rings for damage; replace if necessary.
Make sure check balls move freely in sleeves.
Pilot transfer leak. Tighten tie bolts to 80 in-lbs.
Replace transfer seals.