Troubleshooting - North Star M109161E.4 Owner's Manual

Before troubleshooting or attempting to service, read the following safety rules.
Before attempting to service the water pump:
1. Review

troubleshooting

table
2. Flush the pump
3. Drain the water
pump
4. Disconnect
power
5. Perform repairs
PROBLEM
Pump doesn't revolve
Pump fails to prime
Low capacity
Troubleshooting
WARNING
Review the Troubleshooting Table below for the type of problem you are
experiencing. However, DO NOT attempt to repair until the steps listed below are
followed.
Pump clean water briefly through the pump to removed any debris/solids..
Drain the water pump completely of water using the water pump drain plug, to
prevent freezing.
Switch off the engine and unplug the spark plug wire.
Follow the directions provided in the troubleshooting table to repair the water
pump.
CAUSE
1. Engine will not turn over
2. Rusting/Sticking of impeller
1. Priming chamber not full enough
2. Air leaks on suction line joints
3. Quick coupling gaskets worn
4. Loose or broken hose clamps
5. Priming chamber is over heated
6. Engine speed is too slow
7. Worn or broken volute or impeller
8. Worn or broken mechanical seal
1. Clogged suction hose
2. Dirty suction strainer
3. Flow restriction due to hose kinks
4. Suction lift too high
5. Engine speed too low
6. Worn or broken mechanical seal
7. Reduced engine performance
8. Clogged impeller
9. Worn impeller
See engine owner's manual
Disassemble and clean
Add more water to priming chamber
Check for loose screws or broken hoses
Replace gaskets
Tighten or replace hose clamps
Pour cold water in chamber or let cool
Increase engine speed
Replace worn or broken component
Replace mechanical seal
Clear obstruction
Clear suction strainer
Straighten suction and discharge hoses
Move pump closer to water surface
Increase engine speed
Replace mechanical seal
See engine owner's manual
Remove clog
Replace impeller
17
SOLUTION