15 - 11
Section E
9803/3280
Section E
15 - 11
Issue 1
Fault Finding
PROBLEM:
Leaks between sections.
POSSIBLE CAUSE:
1) Missing or cut seals.
CORRECTIVE ACTION:
1) Disassemble valve stack and check for missing or cut o-rings.
PROBLEM:
Sticking spool.
POSSIBLE CAUSE:
1) Linkage binding. 2) Damaged spool. 3) Uneven torque of tie-rod. 4) Incorrect number of shims
on tie-rods.
CORRECTIVE ACTION:
1) Check linkage. 2) Remove and inspect spool. 3) Loosen tie-rod bolts, check and re-torque. 4)
Disassemble and check that each tie-rod has one shim.
PROBLEM:
Mechanical detent will not hold.
POSSIBLE CAUSE:
1) Broken detent shaft.
CORRECTIVE ACTION:
1) Remove detent & inspect.
PROBLEM:
Electrical detent will not hold.
POSSIBLE CAUSE:
1) Current broken.
CORRECTIVE ACTION:
1) Check current going into detent.
PROBLEM:
Poor performance, slow operating speed and/or low maximum stall speed.
POSSIBLE CAUSE:
1) Blocked flow regulator spool.
CORRECTIVE ACTION:
1) Flow check, remove and clean flow regulator valve, refer to
Service Procedures, Variable
Flow Pumps - Regulator Valve Adjustment
.