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6. GROWLING OR WHINING
- Bad bearing
– replace bearing and repack with correct grease
7. MOTOR RUNS, BUT WATER DOES NOT COME OUT OF THE GUN
- Verify inlet water supply is functioning
- Ensure that the power unit is not located too far above the water level,
exceeding the capacity of the feed pump
- Check that feed pump and inlet water strainers are clear
- Check for leaks in the water lines
- Check for an air-lock in the water inlet lines
- Verify that the feed pump is delivering water
Pump mechanical failure
Bad electrical connections
-
Check that pressure pump inlet and discharge valves are not stuck open
(common problem if not flushed after use with sea water)
-
Check for water going out of the bypass
– regulating unloader failure
8. WATER IN CRANK CASE
- Check the pump seals for damage (feeding water at greater than 50-psi
(3.4 bar) can force water past the seals and damage the seals and
starving the pressure pump of water can overheat and damage the seals)
- Check the plungers for cracks
- Check the plunger rod O-ring for damage
9. AFTER RELEASING THE MECHANICAL TRIGGER, WATER IS STILL
LEAKING OUT OF THE GUN
-
Replace the mechanical trigger valve assembly in the gun handle
10. ZERO-THRUST GUN IS NOT CLEANING PROPERLY
-
Verify that the system is operating at the correct pressure (4,000 psi; 276
BAR).
-
Remove the zero-thrust gun from the water with the system at operating
pressure and trigger in the closed or “OFF” position. If water is leaking out
of the barrel or handle, the trigger valve assembly should be replaced.
-
Check cavitation and zero-thrust nozzles for foreign particles
Visual inspection
With the unit turned OFF
, Insert a small wire into nozzle orifices to
check for obstruction(s)
Remove trigger valve assembly and “back-flush” with compressed air
or pressurized water
