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www.campbellhausfeld.com
Operating Instructions and Parts Manual
Troubleshooting Guide
SYMPTOM
POSSIBLE CAUSE(S)
CORRECTIVE ACTION
Low pressure and /or pump
runs rough
1. Worn or wrong size/type of nozzle
1. Replace with nozzle of proper size
2. Inlet filter on pump clogged
2. Clean. Check more frequently
3. Worn water seals, abrasives in water,
or natural wear
3. Check filter. Replace water seals. See service
center
4. Fouled or dirty inlet or discharge
valves
4. Clean inlet and discharge valve assemblies. Check
filter
5. Restricted inlet
5. Check garden hose, may be collapsed or kinked.
Check inlet water flow
6. Worn inlet or discharge valves
6. Replace worn valves
7. Leaking high pressure hose
7. Replace high pressure hose
8. Pump drawing in air
8. Ensure hoses and fittings are tight
9. Unloader valve seat faulty or worn
9. Check and replace
Water leakage from under
pump manifold
Worn water seals
Install new water seals. See CAT pump service center
Water in pump crankcase
(milky oil)
1. Humid air condensing inside
crankcase
1. Change oil as specified in maintenance schedule
2. Oil seals leaking
2. Install new oil seals. See CAT pump service center
Frequent or premature failure
of the pump water seals
1. Scored damaged or worn plungers
1. Install new plungers. See CAT pump service center
2. Abrasive material in the fluid
2. Install proper filtration on pump inlet plumbing
3. Inlet water temperature too high
3. Check water temperature; may not exceed 100° F.
4. Overpressurizing pump
4. Do not modify any factory set adjustments.
5. Excessive pressure due to partially
plugged or damaged nozzle
5. Clean or replace nozzle.
6. Pump running too long without
spraying
6. Never run pump more than 1 minute without
spraying
7. Pump running dry
7. Do not run pump without water
Strong surging at the inlet and
low pressure
Foreign particles in the inlet or discharge
valve or worn inlet and/or discharge
valves
Clean or replace valves. See CAT pump service center
Oil leakage between the
engine and the pump
Worn oil seals and/or o-ring
Replace oil seals and/or o-ring. See service center
Fluctuating pressure
1. Valve worn, dirty or stuck
1. Discharge or check and replace
2. Pump drawing in air
2. Ensure hoses and fittings are tight. Purge air from
garden hose
3. Nozzle clogged
3. Check or replace
Pressure drops after period of
normal use
1. Worn pump water seals
1. Check and replace
2. Nozzle worn
2. Check and replace
3. Valve worn, dirty or stuck
3. Discharge or Check, clean or replace
4. Unloader valve seat worn or dirty
4. Check, clean or replace
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