HydraMaster CDS 4.6, Owner'S Manual, Page: 40 / 126

6-3: Water Pump Maintenance
1.0.WILL NOT COME UP TO NORMAL CLEANINg PRESSURE
1.1.Pressure adjusting valve
is defective or dirty.
Disassemble valve. Repair or replace as necessary.
1.2.Worn seals or valves in
pump.
Test pump output volume directly from pump at normal
operating rpm. If volume is below manufacturers
specifications, replace seals and inspect for defective
valves.
1.3. Pump rpm is too low. Check engine rpm and adjust as necessary. Check for
loose pump belt. Adjust tension as necessary.
1.4. Primary system control
orifice is missing or loose*.
Remove filter and inspect. Tighten or replace as
necessary.
1.5. Primary orifice is worn.* Measure orifice size and replace as necessary.
*Applies to SAlSA option only.
2.0. NO PRESSURE READINg ON PSI gAUgE
2.1. Pump switch is not
turned on.
Turn on switch
2.2. No water in water box. Refer to section 5 of this manual.
2.3. Pump belt is broken. Replace belt.
2.4. Pump clutch is not
activated. There is no water
in water box
Check system back to source to locate cause of
interruption to water flow.
2.5. Pump clutch is not
activated. There is water in
the water box.
2.5.1. Check for 12 volts at clutch. If 12 volts is present,
replace clutch.
2.5.2. If 12 volts is not present, check power to the low-
water relay. If there is 12 volts at the relay, check low
water switch in water box.
2.5.3. If low water switch has no continuity when float is
up, replace the switch. If switch is good, replace the low
water relay.
Water Pump Troubleshooting