HydraMaster CDS 4.8 - Water Pump Troubleshooting

6-3: Water Pump Maintenance
1.0.Will not come up to normal cleaning pressure
POSSIBLE CAUSE SOLUTION
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
specications, 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
orice is missing or loose*.
Remove lter and inspect. Tighten or replace as
necessary.
1.5. Primary orice is worn.* Measure orice size and replace as necessary.
*Applies to SALSA option only.
2.0. No pressure reading on PSI gauge
POSSIBLE CAUSE SOLUTION
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 ow.
2.5. Pump clutch is not
activated. There is water in
the water box.
Check for 12V at clutch. If 12V is present, replace clutch.
If 12V is not present, check power to the low-water relay.
If there is 12V at the relay, check low water switch in
water box.
If low water switch has no continuity when oat is up,
replace the switch. If switch is good, replace the low
water relay.
WATER PUMP TROUBLESHOOTING