Operating Instructions, Form No. 1000090, Back sheet 5 of 6
PROBLEM
CAUSE
SOLUTION
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 wrench.
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.
1.
Calibrate gauge.
2.
Seal 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. If functioning normally, it
should start to leak off at relief
valve pressure.
4.
Remove the wrench from the
pump. If the pump builds full
pressure, the wrench 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. Inspect for
damage and replace if
necessary, then reassemble.
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 wrench, remove it from
the system to ensure that the
leak is not in the wrench.
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.
3.
Leaking pressure switch seal.
1.
Seal leaking pipe fittings with
pipe sealant.
2.
Clean, reseat or replace flow
control valve parts. If the
internal check valve(s) are
leaking, the pump must be
dismantled and the seat areas
repaired, poppets replaced, etc.
3.
Repair or replace seal.
