7.0
Pump and Unloader Valve Diagnosis
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A.P.R. parts and replace.
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Debris In Valves of Pump.
Remove Valves and clean. Flush Manifold. Install
Inlet Water Filter.
Not Unloading.
Leak in Gunvalve or Hose.
Repair gun leak. Replace leaking or broken
hoses.
Debris or wear in Check Valve.
Remove Check Valve parts and clean.
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valve.
Damaged Piston U-Cup.
Rebuild Unloader Valve (Service Center).
Low Pressure.
Worn or Incorrect Nozzle Size.
Replace Nozzle with proper size.
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Improper engine R.P.M.
Adjust R.P.M. with Tachometer.
Inadequate water supply.
Check supply. Clean or replace Inlet Water Filter.
Pulsation or Hoses Shaking. Inadequate water supply.
Check supply. Clean or replace Inlet Water Filter.
Debris in valves of pump.
Clean Debris from valves.
Install Inlet Water Filter.
Worn high pressure packings.
Install Plunger Seal Repair Kit.
Damaged manifold head.
Check Manifold head for wear or cracks.
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Worn or damaged plungers.
Check for wear or cracks. Replace.
Sand or dirt entering system.
Check or install Inlet Water Filter. Do not use well
water.
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Worn or damaged Plungers.
Check for wear or cracks. Replace.
Sand or dirt entering system.
Check or install Inlet Water Filter. Do not use well
water.
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Engine R.P.M. too high.
Adjust engine R.P.M. with Tachometer.
Operating on unlevel surface.
Move to level surface.
Tire pressure too low or flat.
Inflate tire(s) or repair leak(s).
.
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Note: A.P.R. Spring should be replaced every year
or after every 500 hours.
page 17
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