Portable Pressure Washer Familiarization and Troubleshooting Guide Section 7 • Large Frame Pump
Part 5 - Troubleshooting Problem
Possible Cause
Corrective Action
1. Water leakage at mating flanges.
a. Head bolts improperly torqued.
a. Torque head bolts.
b. Damaged head.
b. Replace head.
c. Missing or damaged o-rings
c. Install new o-rings.
a. Chemical injection fitting improperly torqued.
a. Torque fitting.
b.Check ball missing.
b. Replace check ball and spring.
c. Check ball stuck.
c. Remove, clean and replace fitting, ball and spring.
a. Head bolts improperly torqued.
a. Torque head bolts.
b. Defective head gasket.
b. Install good head gasket.
c. Damaged head.
c. Replace head.
d. Missing or damaged o-rings and backup rings.
d. Install new o-rings and backup rings.
a. Connector not properly seated.
a. Seal with teflon tape and tighten properly.
b. Damaged connector.
b. Replace bad connector.
a. Defective or missing head gasket.
a. Install new head gasket.
b. Head bolts improperly torqued.
b. Torque head bolts properly.
c. Porosity in spacer plate.
c. Replace spacer plate.
a. Thermal bypass piston missing or defective.
a. Install thermal bypass piston.
b. Bad or missing thermal bypass piston spring.
b. Install new spring.
c. Bad o-ring on thermal bypass piston.
c. Install new o-ring.
d. Low pressure water seals leaking.
d. Install new low pressure seals.
e. Defective or missing o-rings on spacer plate truss head screws.
e. Install new o-rings on screws.
f. Spacer plate screws not tight.
f.Tighten to correct torque.
a. Defective or missing engine adapter o-ring or gasket.
a. Install new o-ring or gasket.
b. Engine adapter cap screws not tightened properly.
b. Tighten to correct torque.
2. Water leakage from chemical
injector.
3. Water leakage between pump head
and spacer plate.
4. Water leaks from high pressure out
connector.
5. Water leaking out of head bolts.
6. Water leaking out behind spacer
plate.
7. Oil leak between engine and engine adapter.
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