MAINTENANCE
4-6 / Husky 3 Foam System
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4-3. Troubleshooting
The following outline represents operational difficulties that may arise during the deployment of the unit. It is not a
comprehensive list meant to exhaust every possible malfunction of the equipment. Rather it is a quick checklist to
allow operating personnel to ensure that operator error is not preventing the safe deployment of the unit.
Refer to Service Group 7950-V-014 in the Service Manual provided with your apparatus for addition information
regarding the Linear Variable Displacement Transducer (LVDT) signal conditioning unit.
Table 4-3: General Troubleshooting
Symptom Possible Cause Corrective Action
1. Husky 3 display doesn't light up. No power. • Check/reset 100 amp circuit
breaker.
Faulty circuit breaker. • Check system voltage before
and after circuit breaker.
Replace circuit breaker.
Blown/Faulty 10 amp display fuse. • Replace 10 amp display fuse
Wiring issue. • Check power and ground wire
connections.
2. Power unit will not start. No power. • Check/reset 100 amp circuit
breaker.
Faulty circuit breaker. • Check system voltage before
and after circuit breaker.
Replace circuit breaker.
Faulty start solenoid. • Check for voltage at start
solenoid. Replace start
solenoid.
Wiring issue. • Check for voltage at motor
power stud.
Wiring issue. • Check power and ground wire
connections.
Faulty control head. • Replace control head.
3. Pump cycles but will not draft 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.
Vacuum leak. • Install vacuum gauge on inlet
and confirm vacuum level
(20hg).
Vacuum leak. • If low vacuum on pump inlet,
remove inlet manifold and
inspect inlet check valves or
possible check valve
obstruction.
Faulty foam pump seals. • Inspect cylinder bore or piston
seals on piston.
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