SPX FLOW Power Team PE55TWP-E110 Operating Instructions Manual page 20

Troubleshooting Guide Continued
TROUBLE
Pump builds pressure but
cannot maintain pressure.
Pump will not build full
pressure.
© SPX FLOW, Inc.
CAUSE
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� 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. C heck for leaks in the flow
control valve�
6� Inspect the pump for internal
leakage� Check high pressure
pump inlet or outlet ball checks�
19
SOLUTION
1. S eal leaking pipe fittings with pipe
sealant�
2. C lean, 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�
1� Calibrate gauge�
2. S eal faulty pipe fittings 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. R emove the wrench from pump.
If 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�
Form No. 1000090
Rev. 5 Nov. 6, 2023