Internal leakage in the power cylinder
Cause
Corrective Action
One of the power cylinders is
bypassing.
This problem will be diagnosed during the
previous tests.
If oil is leaking from the low-pressure hose at
the directional control valve, put the valve
lever in the neutral position and reconnect
the hose. Disconnect one of the low-pressure
lines leading from the manifold to the power
cylinders. (see picture below)
Turn the Directional Control Valve lever to
the right, (High Pressure mode). If oil leaks
out of the low-pressure hose then the cylinder
is bypassing, which means that one or more
seals are damaged on one of the pistons in the
power cylinder.
If no oil leaks, return the lever to the neutral
position, reconnect the first low pressure hose
then disconnect the next low pressure hose
and urn the Directional Control Valve lever
to the right, (High Pressure mode). Continue
this process for all four cylinders and note
which cylinder (it may be more than one so
check all cylinders) needs to be replaced. If
no replacement cylinder is available, you
may blank off the high-pressure line leading
to the damaged cylinders and continue using
the remaining cylinders.
Cause
Corrective Action
Repair procedure for a damaged
When replacing a seal the working
High Pressure
Low pressure
