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Section 7 • Large Frame Pump
Portable Pressure Washer Familiarization and Troubleshooting Guide
Part 5 - Troubleshooting
11. Detergent does not mix with spray.
a. Nozzle is in “high pressure” mode.
b. Chemical suction line is not submerged.
c. Chemical suction strainer or line is
clogged.
a. Reset nozzle to “low pressure”.
b. Insert line into fluid.
c. Clean or replace strainer or line.
9. Oil leak between pump crankcase and
spacer plate.
a. Missing or bad low pressure seals.
b. Missing or bad piston oil seal.
c. Cracks in casting.
a. Install new seals.
b. Install new oil seals.
c. Replace cracked casting.
10. Pump does not produce pressure,
exhibits erratic pressure, chatters or has
a low water volume.
a. Nozzle is set to low pressure mode.
b. Incorrect spray nozzle is used.
c. Spray nozzle is obstructed.
d. Water Inlet blocked
e. Inadequate water supply to pump.
f. Water supply hose kinked or leaking.
g. Clogged inlet hose strainer.
h. Water supply too hot.
i. Worn or defective pump.
j. Unloader-regulator valve set wrong.
k. Obstructed nozzle.
l. Obstructed chemical injection system.
a. Reset nozzle to high pressure.
b. Replace with correct nozzle.
c. Clear obstruction from nozzle.
d. Clear inlet.
e. Provide sufficient water supply.
f. Relieve kinking or repair leak.
g. Clean strainer.
h. Reduce inlet water temperature to below
140oF.
i. Disassemble and repair pump.
j. Set valve to high pressure.
k. Clear nozzle of obstructions.
l. Remove, clean and replace chemical
injection components.
Problem
Possible Cause
Corrective Action
8. Oil leak between engine adapter and
pump crankcase.
a. Missing or bad o-ring seal.
b. Cap screws not tightened properly.
a. Install new o-ring seal.
b. Tighten to correct torque.