OPERATION
OPERATION
Problem
Cylinder Excessive Drift
Cylinder Leaks at Fittings
Cylinder Leaks at Rod
Cylinder Moves Wrong Way (Not the function that was actuated)
Cylinder Moves intermittent (all functions)
Possible Cause
May be normal Operation
Cylinder Piston Seals Bypass
Damaged or Defective Work Port Relief Valves
Main Valve Spool Leakage
Oil Contamination
Related to Issues described in Previous section: Boom moves under its own power Loose Fittings
Wrong Fittings Installed
Damaged or defective fitting (cracked)
Fitting Port cracked Faulty Seals on Cylinder Gland
Damaged Cylinder Rods Cylinder Rods Bent
Incorrect Hose Routing
Wire Harness improperly Installed
Operator Perception of Correct Operation is incorrect
Cylinder Control Pump Failure (all functions affected)
Load Sense Signal Not reaching the pump
Low Or Improper Oil in Hydraulic system
Contamination of Oil causing restricted flow in the valve.
No voltage to Joystick Controller
Faulty Joystick Controller
Remedy
Check Allowable Drift rates in Service Manual
Test to confirm and repair or replace
Check Relief Pressures. Repair or replace as required
Confirm with tests, Repair or replace as required
May be root cause of any internal Leakage. Test oil and replace as required.
review the previous section
Check for cracks and retighten
Replace with Correct fittings
due to over tightening, replace hose or fitting
Repair or replace Cylinder or port
Disassemble and Replace
Clean or Replace the Rod as required.
Determine Cause of Overload. Replace the Rod
Check Hose Diagram in the Service Manual and route the hoses correctly
Confirm incorrect placement and Re attach the harness connectors as needed.
Consult the Operator's Manual for Correct operation and communicate with the Operator.
Test pump to confirm. Rebuild or replace as required.
Check valve Pilot pressure and Load sense check valves.
Replace or fill as required.
Replace oil, and clean components.
Check Fuses, wires etc and repair as required
Test then replace or repair as required.
DB150 07/11 | Operation Section |
© 2011 Alamo Group Inc.
