© 2022 Pierce Manufacturing Inc. All Rights Reserved. Husky 3 Foam System / 4-9
MAINTENANCE
11. Erratic pump operation. No foam concentrate. • Check foam tank level. Fill if
required.
Inlet strainer plugged. • Check inlet strainer for
obstructions.
Vacuum leak. • Check inlet hose and/or inlet
connections for vacuum leak.
Foam Pump (LVDT) Transducer
feedback voltage not correct.
-low set range is 0.55 to .75 volts
-high set range is 4.40 to 4.20 volts
• Confirm feed back voltage
range in calibration mode
(screen C7). See “Configuration
Procedure” on page 4-2.
Foam Pump (LVDT) Transducer not
calibrated.
• Auto-Calibrate Foam Pump
(LVDT) Transducer (screen
C7). See “Configuration
Procedure” on page 4-2.
12. External foam or oil leakage out
of pump weep holes.
Piston rod and piston rod seals
leaking.
• Pump assembly will have to
disassembled and inspected.
Inspection will have to be
completed on the piston rod
assembly and piston rod seals.
It's in probable that both the
piston rod and piston rod seals
will have to be replaced.
13. “HI” is displayed on screen. This is normal if pumping system
limit of 3gpm of foam.
• Decrease Foam Flow.
If system is inoperable, check foam
pump LVDT transducer voltage.
• Confirm feed back voltage
range in calibration mode
(screen C7). See “Configuration
Procedure” on page 4-2.
14. System will not pump foam from
foam tank.
•See Table 4-4., System Will Not
Pump Foam from Foam Tank.
Table 4-4: Specialized Troubleshooting-
System Will Not Pump Foam from Foam Tank
Question Reason for Question Test Procedure
A. Is there foam in the foam
tank?
The foam system will not
operate properly without
an adequate supply of
concentrate.
Visual inspection.
Table 4-3: General Troubleshooting
Symptom Possible Cause Corrective Action
Fill tank with foam; see
Section 2.
No
Yes
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