Revision 2
3.
High Pressure Pump Discharge Pressure - High (Above Unit
Rating)
Probable Cause
a.
Excessive engine speed
b. Too small
of
nozzle
c.
Too small
of
discharge
hose
d.
Inaccurate pressure
gauge
Corrective Action
Adjust speed control by adjusting throttle linkage.
Replace with proper size nozzle.
Replace with proper size hose.
Replace.
4.
High Pressure Pump Discharge Pressure - Low
Probable Cause
Corrective Action
a.
Insufficient engine speed Adjust speed control by adjusting throttle.
b.
Too large of nozzle
Replace with proper size nozzle.
c.
Belts slipping
Adjust.
d.
Leaking valves Rework or replace.
e.
Leaking by-pass valve
Repair or replace.
f.
Clutch slipping
Adjust or repair.
g.
Inaccurate pressure
Replace.
gauge
© Copyright December, 1999 NLB Corporation
6-6
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