Revision 2
Ill. Trouble-Shooting Guide
A.
Symptoms
1.
Excessive Pulsation
in
High Pressure Pump Discharge
Excessive pulsation in the high pressure pump discharge piping or hoses is evidenced by a
hose leading to the accessory lance or foot control valve oscillating back and forth more than
1-1/16"
(27 mm).
Probable Cause
Corrective Action
a.
Insufficient water in tank Fill water in tank. This condition could be caused by
water shut off to the high presure water jetting unit.
Check water supply to source.
b.
Pump not primed Accomplish the following:
c.
Valves sticking open
d.
Valve springs broken
e.
Valves scored
f.
Belts slipping
1.
Open by-pass on accessory cleaning lance. Engage
clutch and throttle engine upwards for one (1) minute
or until you observe smooth discharge at by-pass.
Repeat several times
if
needed.
If
unsuccessful,
proceed to step #2.
2.
Bleed pump at valve intake cover by loosening caps
and engaging clutch.
This condition is caused by a piece
of
dirt or an object
stuck between the valve and seat. Clean and deburr
valve.
Replace.
See Section 8: REPAIR.
Replace. See Section 8: REPAIR.
Adjust.
2.
Excessive Unit Vibration
Probable Cause
a.
Excessive pump
pulsation
b.
Excessive engine
vibration
Corrective Action
See Symptom #1: Excessive Pulsation
in
High Pressure
Pump Discharge.
See diesel engine manual in the MANUFACTURERS'
LITERATURE
section
of
this manual.
© Copyright December, 1999 NLB Corporation
6-5
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