Specifications

MS TECHNICAL MANUAL
LAST UPDATE 12-10-04
1060003 12/04
TESTING WATER PUMP
(Water Tank Equipped Models)
See Water Pump under “Component Description & Function” before proceeding
To Test Diode: Remove diode from pump.
Set your VOM to “Diode” check setting.
Measure across both diode terminals & note the reading. Next,
reverse your VOM leads on diode & measure again. Reading
should be infinity one way & 470-520 the other way.
Replace if fails test.
To Test Pump Coil: Remove diode from pump.
Verify 4-6 ohms across the 2 orange wires on pump.
Replace if fails test.
To determine if water pump is leaking through:
Turn power off & dry up any water that is present on the generator surface.
Once dry, fill the water tank with water. NOTE: Verify the tank filter is installed & not torn or damaged.
Does water begin to slowly flow onto the generator surface? If yes, disassemble & clean out the water pump.
If still leaks, replace water pump.
To Clean: Turn power off & unplug unit.
Drain the water tank.
Disconnect pump wires.
Disconnect rubber hoses from both ends of the pump.
Remove the pump’s bottom mounting nuts & remove pump.
Cautiously remove the pump’s two end plastic nipples.
NOTE: A check valve is behind each nipple. Make note of their color & position for proper reassembly.
Inspect both check valves. Replace if their rubber seal is torn or missing. If not torn, rinse in water.
Clean out the pump’s body with water & properly reinstall the check valves & end nipples.
Remount the pump & secure with the nuts. NOTE: Arrow on pump body should correspond with water flow
Reinstall the rubber hoses & wiring.
Verify the water tank filter is properly installed & not torn. Replace if needed. NOTE: MS-355 does not contain a water
filter.Fill tank with water & test for proper operation.
Replace both check valves or pump if continues to leak.