Trebor 110R - Manual (Page 21)

MODEL 110R PUMP OPERATION / MAINTENANCE MANUAL PAGE 21
Erratic Cycling
Cause: Solution:
 Leaking shuttle cap.  Tighten; or remove and wrap with TFE thread tape prior to
tightening.
 Fluid supply line restricted (cavitation).  Reduce fluid restriction.
Reduce distance, height of suction head.
Increase diameter of suction supply line (reduces
restriction).
 Fluid supply line pressure.  Adjust check muffler assembly (see Section 0).
 Pilot valve not seating.  Check pilot valve function and seal.
Additional TFE thread tape on pilot valve threads.
 Pilot valve transfer O-rings leaking.  Check diaphragm hole alignment. Replace O-ring seals.
 Check ball(s) not seating.  Replace check balls and O-rings.