Pierce HUSKY 3 Operation & Maintenance Manual page 48

MAINTENANCE
Question
B. Is the green light on the control
module ON?
Yes
Question
C. Does the foam pump engage?
Yes
Question
D. Tank fill option - look to see if
the selector valve is in the
TANK FILL mode.
Yes
No
4-10 / Husky 3 Foam System
Reason for Question
A green light indicates that
the electrical portion of the
system is functioning.
Go to Step J.
No
Reason for Question
To isolate the problem
from between electrical
and mechanical failures.
Go to Step M.
No
Reason for Question
If the tank fill valve is
open, all of the foam
concentrate will circulate
between the foam pump
and the foam tank, with
little or none being
injected.
Go to Step P.
Test Procedure
Visual inspection.
Test Procedure
NOTE: You must be flowing water for
the foam pump to operate.
Turn the foam percent up and listen for the
foam pump to engage. Press and hold PRIME
button with foam pump discharge drain open. If
foam pulsates out of drain valve, foam pump is
stroking (pumping).
Test Procedure
Remove the tube from the outlet of the tank fill
valve. Operate the foam system. If foam
concentrate is discharged, the tank fill valve is
open.
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