© 2022 Pierce Manufacturing Inc. All Rights Reserved. Husky 3 Foam System / 4-1
SECTION 4 MAINTENANCE
4-1. Maintenance Introduction
This section of the manual has been prepared to help keep your equipment in good operating condition and ready
for its primary mission.
The procedures and recommended intervals in this section are based on normal operating conditions and may have
to be modified to meet the existing conditions. Some environmental concerns may dictate that inspection and
maintenance be performed at more frequent intervals.
For various proportioning system components (water pump, discharge devices, valves, actuators, etc.), refer to that
particular component’s Operation and Maintenance Manual or Service Manual Group (chapter).
4-1.1 Testing After System Maintenance
If during the course of normal system maintenance it becomes necessary to replace, repair, or modify system
components, component parts, operating devices or equipment, the system must be tested to ensure proper
operation before being placed back into service.
The services of a qualified field engineer to inspect the system, run the tests for start-up, and the annual inspection
can be provided. Additional details can be obtained by contacting Pierce Manufacturing.
1. Draining Foam Pump After Testing (with water in foam cell)
a. Open all drains.
b. Remove foam inlet cap.
c. Turn 2-way Foam Injection/Fill valve to the middle position (halfway between TANK FILL and FOAM
INJECT).
d. Open foam tank drain valve.
e. Open Tank/Draft valve halfway until water stops draining.
f. Install foam inlet cap.
g. After moving truck to its destination, cycle the foam tank valves again to get any residual water out of the
lines.
2. Draining Foam Pump After Testing (with water in draft mode and foam in foam cell)
a. Remove water source from draft inlet (leave Foam Tank/Draft handle UP in the Draft position).
b. Open foam pump drain(s) to drain excess water out of foam pump.
c. Close foam pump drain(s).
d. Install foam inlet cap.
e. Move Foam Tank/Draft handle DOWN to the Tank position.
f. See “Priming (Charging) System” on page 3-6. to recharge foam system.
During cold weather, the foam system must be blown out after testing with water. Water cannot remain
in the foam system after testing. Either fill the foam system with foam concentrate or blow out the foam
system with compressed air using the following procedure. Failure to comply may result in the water
freezing and damaging foam system components.
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