Generac Power Systems 2500 Diagnostic Repair Manual page 7

Diagnostic Tests
Test 1 – Verify Supply Water Source
Procedure
1. Turn on the water source. With the supply hose
disconnected from the pump run the hose for 30
seconds to clear out any debris and to ensure it is
free of kinks.
2. Turn off the water supply.
3. Before connecting the hose check the inlet screen
for debris, and check the gasket for damage.
4. Connect the supply hose. Turn on the water and
repeat test.
Results
1. If there is no flow through the supply hose when
the water is turned on check the hose for blockage.
2. If the screen is blocked remove the debris. If the
screen or gasket is damaged it should be replaced.
Minimum Water Supply Flow Requirements
Residential 3.8 Gallons Per Minute
Commercial 8.5 Gallons Per Minute
Test 2 – Check Pump For Water Flow
Procedure
1. Turn off the supply water.
2. Disconnect the high pressure output hose.
3. With the engine off, turn on the supply water to the
pump. Water should flow. Allow water to flow until
system is free of debris and air.
4. Turn off the supply water.
5. Reconnect the high pressure hose and retest.
Results
1. If the pump has no water flow, check for air leaks in
the supply hose or a damaged seal at the pumps
inlet connection. Repair as necessary.
2. Refer back to the flow chart.
Test 3 – Test High Pressure Hose
Procedure
1. Turn off the supply water.
2. Disconnect the gun assembly from the high
pressure hose.
3. With the engine off, turn on the supply water.
4. Water should flow.
Diagnostic Repair Manual
Section 1 Pump Troubleshooting
Results
1. If water does flow discontinue testing.
2. If water does not flow, the high pressure hose is
clogged. It will need to be replaced.
3. If water flows, refer to flow chart - Problem 1 to
complete troubleshooting.
Test 4 – Check Spray Gun Assembly
Procedure
1. Turn off the supply water.
2. Point the lance in a safe direction and pull the
trigger until water ceases to flow from the lance.
Engage the trigger lock when not in use.
3. Disconnect the lance from the spray gun.
4. With the engine off, turn on the supply water.
5. Pull the trigger assembly on the spray gun. Water
should flow.
WARNING
Personal injury. Risk of fluid injection.
Do not aim spray gun at people, animals,
electrical devices, or fragile items. Keep out
of reach of children. Failure to do so
could cause death or serious injury.
Results
1. If water does not flow, replace the spray gun.
2. If water flows, refer to the flow chart - Problem 1.
Test 5 – Checking the Spray Nozzle
Procedure
1. Verify that the nozzle matches the recommended
pressure and flow of the pump. See Owner's Man-
ual for nozzle identification.
WARNING
Personal injury. Risk of fluid injection.
Do not aim spray gun at people, animals,
electrical devices, or fragile items. Keep out
of reach of children. Failure to do so
could cause death or serious injury.
2. Remove the nozzle from the lance. Using a small
paper-clip, slide it into back side of the nozzle and
move it around to remove any debris in the nozzle
tip.
NOTE: The nozzle tip can also be lightly tapped against
a hard surface to help dislodge debris.
3. Install the nozzle into the lance.
4. Connect the lance to the spray gun and test.
(000117c)
(000117c)
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