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OPERATION
DB150 07/11 Operation Section 4-40
© 2011 Alamo Group Inc.
OPERATION
Problem Possible Cause Remedy
Cylinder Excessive
Drift
May be normal Operation Check Allowable Drift rates in Service Manual
Cylinder Piston Seals
B
yp
ass
Test to confirm and repair or replace
Damaged or Defective
Work Port Relief Valves
Check Relief Pressures. Repair or replace as
required
Main Valve Spool Leakage Confirm with tests, Repair or replace as
required
Oil Contamination May be root cause of any internal Leakage.
Test oil and replace as required.
Related to Issues
described in Previous
section: Boom moves
under its own power
review the previous section
Cylinder Leaks at
Fittings
Loose Fittings Check for cracks and retighten
Wrong Fittings Installed Replace with Correct fittings
Damaged or defective
fitting (cracked)
due to over tightening, replace hose or
fitting
Fitting Port cracked Repair or replace Cylinder or port
Cylinder Leaks at Rod
Faulty Seals on Cylinder
Gland
Disassemble and Replace
Damaged Cylinder Rods Clean or Replace the Rod as required.
Cylinder Rods Bent Determine Cause of Overload. Replace the
Rod
Cylinder Moves Wrong
Way (Not the function
that was actuated)
Incorrect Hose Routing Check Hose Diagram in the Service Manual
and route the hoses correctly
Wire Harness improperly
Installed
Confirm incorrect placement and Re attach the
harness connectors as needed.
Operator Perception of
Correct Operation is
incorrect
Consult the Operator's Manual for Correct
operation and communicate with the Operator.
Cylinder Moves
intermittent (all
functions)
Cylinder Control Pump
Failure (all functions
affected
)
Test pump to confirm. Rebuild or replace as
required.
Load Sense Signal Not
reaching the pump
Check valve Pilot pressure and Load sense
check valves.
Low Or Improper Oil in
Hydraulic system
Replace or fill as required.
Contamination of Oil
causing restricted flow in
the valve.
Replace oil, and clean components.
No voltage to Joystick
Controller
Check Fuses, wires etc and repair as required
Faulty Joystick Controller Test then replace or repair as required.