9.800-083.0 • REV. 11/06
PRESSURE
W
ASHER
Tr
oub
leshooting Guide
12
PRobleM
PoSSIble CAUSe
SolUTIoN
loW oPeRATINg
PReSSURe
Faulty pressure gauge
Install new gauge.
Insufficient water supply
Use larger supply hose; clean filter at
water inlet.
Old, worn or incorrect spray nozzle
Match nozzle number to machine and/or
replace with new nozzle.
Belt slippage
Tighten or replace; use correct belt.
Plumbing or hose leak
Check plumbing system for leaks. Retape
leaks with teflon tape.
Faulty or misadjusted unloader valve
Adjust unloader for proper pressure. Install
repair kit when needed.
Worn packing in pump
Install new packing kit.
Fouled or dirty inlet or discharge valves
in pump
Clean inlet and discharge valves.
Worn inlet or discharge valves
Replace with valve kit.
Obstruction in spray nozzle
Remove obstruction.
Leaking pressure control valve
Rebuild or replace as needed.
Slow engine RPM
Set engine speed at proper specifications.
Pump sucking air
Check water supply and possibility of air
seepage.
Valves sticking
Check and clean or replace if necessary.
Unloader valve seat faulty
Check and replace if necessary.
FlUCTUATINg
PReSSURe
Valves worn
Check and replace if necessary.
Blockage in valve
Check and replace if necessary.
Pump sucking air
Check water supply and air seepage at
joints in suction line.
Worn piston packing
Check and replace if necessary.
TRoUbleSHooTINg
Unloader valves are preset and tested at the factory
before shipping. Occasional adjustment of the unloader
may be necessary to maintain correct pressure.
Start with the valve set at its lowest spring tension. Raise
pressure by turning adjusting knob clockwise until pres-
sure is at the desired position. Do not overtighten.
AdjUSTINg UNloAdeR vAlveS
Open and close spray gun to be sure pressure is correct.
Raise or lower pressure by adjusting the knob.
Do not by-pass more than 1-2 minutes when by-passing
to the suction side of the pump.
