33PI-121January 2020
Problem Remedy
...continued • If the pressure is below 25 psi (but the pressure
reading on the Multi-Mode Valve gauge is at
least 80 psi), either an air leak or flow restric-
tion exists in the air lines (check or replace air
lines) or there is a problem with the control gun
(consult instructions for specific gun).
4. If air does begin flow out from the top port of the
brass pilot valve when gun triggers are squeezed, it
indicates a problem with either the air cylinder or the
Multi-Mode Valve cartridge. If this is the case:
• Remove four capscrews that connect the air cyl-
inder to mounting plate on top of the valve body,
but do not remove the four capscrews that hold
the air cylinder together.
• Reconnect the air line between the top port of
brass pilot valve and the air cylinder.
• If the piston on the underside of the cylinder
does not extend outward and retract quickly
when the gun triggers are squeezed and re-
leased, replace air cylinder.
• If the air cylinder does not function as it should,
and all above checks have been performed, the
problem must be with the Multi-Mode Valve
cartridge. Remove and check for any restriction
to movement. Replace if necessary.
Dump Mode: No
water flows to the
gun when the trig-
gers are squeezed,
but the gun begins
to rotate.
This is the same problem as the previously discussed
issue for Constant Pressure or Shut-In Mode in that the
actuation mechanism of the valve is not working prop-
erly. To diagnose exact cause, see previous issue.
Dump Mode: Sys-
tem pressure does
not build to desired
level.
This is the same problem as the next discussed issue
for Constant Pressure or Shut-In Mode in that water is
escaping somewhere other than through the gun nozzles
or the gun nozzles are worn or incorrectly sized. To diag-
nose exact cause, see next issue.
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