V-22
TROUBLESHOOTING
LIFT ARMS
SLOWLY PULLING THE CONTROL LEVER OF THE LIFT ARMS CAUSES THE LIFT ARMS TO
DROP MOMENTARILY.
Inspect for leaks inside
the lift arm cylinders.
2
Inspect the load check
valve of the control
valve.
1
Repair or replace control
valve.
Repair or replace lift arm
cylinder.
Faulty
1. Inspect the load check valve of the control
valve.
a. Disconnect the hoses running from the control
valve to the lift arm cylinders at the control
valve.
b. Install the hoses to the bucket section.
c. Try moving the lift arm cylinders. If the lift
arm cylinders move normally, the load check
valve may be assumed to be the source of the
problem.
Always be sure to lower the lift arms and
bring the bucket down and into contact
with the ground before beginning the above
procedure.
Reference: The quantity of oil and its pressure
is low when the spool begins operation. This
places a heavy load on the lift arm cylinders
when the load check valve is not functioning
properly, thus causing the oil to flow outwards
and correspondingly causes the lift arms to dip
downwards momentarily.
2. Inspect for leaks inside the lift arm cylin
-
ders.
If oil is leaking from the head end (A) to the
rod end (B) as a result of a problem with the
pistons or tubes within the lift arm cylinder, the
low amount of oil and pressure when the spool
begins turning causes the lift arm cylinder to
momentarily dip downwards. Note that it also
causes the cylinder to fail to function. Also note,
however, that the degree to which the lift arm
cylinder falls under the force of gravity alone is
also greater than at other times.
• Inspect the cylinder.
“V-21”
Faulty
Normal
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