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Operation
Owner’s Manual for Water Pump 9
Preventing Water Hammer
Water hammer occurs when the discharge
flow is suddenly blocked or stopped.
Pressurized water trapped inside the pump
can crack the pump housing. To prevent water
hammer:
• Do not close the discharge valve while the
pump is operating.
• Do not allow vehicles to drive over the
discharge hose.
• Do not abruptly compress the discharge
hose.
Water Pump Shut Down
1. Move throttle lever from fast to slow.
2. Turn engine switch OFF.
3. Move fuel valve lever to OFF position.
4. Allow the engine to cool thoroughly.
After Each Use
After cooling, remove the priming plug (A) and
drain plug (B) from the pump housing and
allow it to drain thoroughly.
Figure 3-6. Drain Pump Housing
NOTE: DO NOT allow water to remain in
pump after use. Trapped water can freeze and
crack the pump housing. Pump damage
caused by freezing is not covered by warranty.
Follow these procedures after every use:
1. Drain pump housing.
2. Disconnect hoses.
3. Wipe pump with a clean, dry cloth to
remove excess water and dirt.
4. Store equipment in a clean, dry area.
NOTE: If storing for more than 30 days, see
Storage.
001522
B
A
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