© 2022 Pierce Manufacturing Inc. All Rights Reserved. Husky 3 Foam System / 4-11
MAINTENANCE
Question Reason for Question Test Procedure
E. Is the foam relief valve stuck
OPEN on the foam pump?
Foam concentrate will
circulate between the inlet
and outlet of the foam
pump and not inject into
any waterway.
Remove the hydraulic hose from the foam
injection check valve and install a pressure
gauge at the end of the hose (600 psi). Turn
system ON and hold PRIME button down, foam
relief valve should be set at 400 PSI.
Question Reason for Question Test Procedure
F. Is the foam injection check
valve stuck in the CLOSED
position?
Foam concentrate cannot
reach the foam injection
manifold if the check valve
is stuck closed.
Check by visual inspection, or the foam pump
may make a squealing noise when the pump
goes into the relief mode.
Question Reason for Question Test Procedure
G. Is the wiring OK? The foam system will not
operate properly if the
wiring is faulty.
Refer to the wiring diagram for circuit
information.
Reset or Replace Foam Relief
Valve.
Yes
No
Replace the foam injection
check valve.
Yes
No
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