Operating Instructions, Form No. 102561, Back sheet 3 of 4
PROBLEM
CAUSE
SOLUTION
Pump builds pressure but cannot
maintain pressure
(1) Check to see if there are any
external leaks. If no oil leakage is
visible, the problem is internal. If
using a double-acting cylinder,
remove it from the system to insure
that the leak is not in the cylinder.
(2) To test for a leaking control
valve, lift the pump from the reservoir
but keep the filter in the oil. Remove
the drain line to see if the oil is
leaking from the valve. If the valve is
not leaking, the internal check valve
could be leaking. Refer to the note
concerning checking for oil leaks at
the beginning of this Troubleshooting
Guide.
(1) Reseal leaking pipe fittings with
pipe sealant.
(2) Clean, reseat or replace control
valve parts. If the internal check
valve(s) are leaking, the pump must
be dismantled and the seat areas
repaired, poppets replaced, shear
seals relapped, etc.
Pump will not build full pressure
(1) Faulty pressure gauge
(2) Check for external leakage
(3) Check the external pressure
regulator. Check the relief valve
setting.
(4) Look for internal leakage in
double-acting cylinders.
(5) Check for leaks in the flow
control valve
(6) Inspect the pump for internal
leakage. Check high pressure pump
inlet or outlet ball checks.
(7) Sheared Key(s)
(8) Inadequate air pressure
(1) Calibrate gauge
(2) Seal any faulty pipe fitting with
pipe sealant.
(3) Lift the pump from the reservoir
but keep the filter immersed in oil.
Note the pressure reading when the
relief valve begins to open up. If
functioning normally, it should start to
leak off at relief valve pressure.
(4) Remove the cylinder from the
pump. If the pump builds full
pressure, the cylinder is defective.
(5) Clean and reseat or replace
parts.
(6) Same procedure as above but
look for leaks around the entire inner
mechanism. If there are no visible
leaks the high pressure pump
subassembly may be leaking.
Remove all parts. Check the valve
head assembly body for any damage
to the seat area. Clean and reseat if
necessary. Inspct for damage and
replace parts if necessary, then
reassemble.
(7) Replace
(8) Increase air pressure.
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