15 - 11
Section E
Hydraulics
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.
To Next Page
Loading...
Need help?
General
