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7.0
Pump and Unloader Valve Diagnosis
P
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O
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Not Unloading.
Low Pressure.
Pulsation or Hoses Shaking. Inadequate water supply.
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Debris In Valves of Pump.
Leak in Gunvalve or Hose.
Debris or wear in Check Valve.
C
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Damaged Piston U-Cup.
Worn or Incorrect Nozzle Size.
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Improper engine R.P.M.
Inadequate water supply.
Debris in valves of pump.
Worn high pressure packings.
Damaged manifold head.
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Worn or damaged plungers.
Sand or dirt entering system.
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Worn or damaged Plungers.
Sand or dirt entering system.
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Engine R.P.M. too high.
Operating on unlevel surface.
Tire pressure too low or flat.
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A.P.R. parts and replace.
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Remove Valves and clean. Flush Manifold. Install
Inlet Water Filter.
Repair gun leak. Replace leaking or broken
hoses.
Remove Check Valve parts and clean.
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valve.
Rebuild Unloader Valve (Service Center).
Replace Nozzle with proper size.
T
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e t
n
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e r
p
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e c
b
l e
. s t
Adjust R.P.M. with Tachometer.
Check supply. Clean or replace Inlet Water Filter.
Check supply. Clean or replace Inlet Water Filter.
Clean Debris from valves.
Install Inlet Water Filter.
Install Plunger Seal Repair Kit.
Check Manifold head for wear or cracks.
R
e
p
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e c
e s
a
s l
w
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P
u l
n
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Check for wear or cracks. Replace.
Check or install Inlet Water Filter. Do not use well
water.
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Check for wear or cracks. Replace.
Check or install Inlet Water Filter. Do not use well
water.
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Adjust engine R.P.M. with Tachometer.
Move to level surface.
Inflate tire(s) or repair leak(s).
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. A
. P
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Note: A.P.R. Spring should be replaced every year
or after every 500 hours.
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