HARBEN 903-1315, Operation & Maintenance Manual

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6.1. Equipment Fault Finding
6.2. Selector Fault Finding
Problem Possible Cause Recommended
Action
Low system
pressure
Worn or incorrectly sized nozzle.
Blocked water filter.
Blocked suction hose.
Damaged suction hose.
Leaks in delivery hoses/couplings.
Unloader valve leaking.
Worn pressure packings.
Worn suction or delivery valves.
Replace nozzle.
Clean filter element.
Remove obstruction.
Repair or replace.
Check all joints for tightness.
Replace any worn hoses.
Repair or replace.
Replace worn parts.
Replace seals or renew valves.
Low pressure and
pump pulsing
Broken valve spring.
Leaking O-ring on valve cartridge.
Worn pressure packings. Replace spring.
Renew O-rings.
Renew packings.
Excessive water
leakage from pump
Worn pressure packings.
Scored plungers. Renew packings.
Replace plungers.
Water in crankcase
Filler/breather cap missing.
High humidity. Replace cap.
Replace oil and reduce oil
change interval.
Noisy operation
Worn bearings. Overhaul or replace pump.
Oil Leaks
Worn pressure packings.
Worn oil seals. Renew packings.
Replace oil seals.
Selector problem Cause Action
Loss of pressure and
flow is down. Water leaking through the worn seat
back to tank. Replace the seats and the plug
if also damaged.
If water leaks along
spindle and past lever. O-ring and back up ring failure along
shaft. Replace O-ring and back up ring
013-021 & 023-001.
Water leaking along
the gland nut thread. Leaking selector seal. Replace seal 012-095.