Section 9
Troubleshooting
20479300
2-2012/Rev 01
9-4
Table 9-1
S50 Troubleshooting Guide
Malfunction Indication Comments
9.
Abnormal fluctuations in
high pressure water signal
Large, worn or damaged
orifice
Make sure the orifice does not
exceed the capacity of the pump.
Make sure the orifice is in good
working condition. Verify that
the jewel is installed in the
orifice mount.
Check valve leakage Inspect the discharge check
valves in the sealing heads.
Inspect the inlet check valves in
the sealing heads.
Seal leakage Inspect the high pressure seal on
the plunger.
Inspect the sealing head-to-
cylinder sealing surfaces.
Hydraulic control
malfunction
Check the operation of the
hydraulic relief valve.
Verify that the directional
control valve is shifting
properly.
Check the operation of the
proximity switches.
10.
Hot surfaces on the high
pressure cylinder
components
Leaking discharge check
valve
Inspect the condition of the seat,
poppet valve, spring, poppet pin
and sealing head surface on the
discharge end of the sealing
heads.
Leaking inlet check valve Inspect the condition of the
poppet valve and poppet retainer
on the inlet end of the sealing
heads.
Damaged sealing head Check the cone flange surface of
the sealing head for scratches or
mechanical damage and replace
if necessary.
Damaged high pressure
cylinder
Check the high pressure cylinder
for cracks.
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