OPERATION
5-18 / General Operation
© 2020 Pierce Manufacturing Inc. All Rights Reserved.
Where multiple drivers share a vehicle, always allow extra time between shifts to ensure that adjustments to mirrors
can be made.
5-8. Pump
IMPORTANT: In the event that the throttle control at the pump operator’s panel becomes inoperative, the
accelerator pedal in the cab may be used as an alternative means to control the engine
speed while pumping. (Detroit Diesel engines only.)
Some Pierce fire apparatus are equipped with a driveline driven water pump. For pump operating information, refer
to the Pierce Pumpers Operation & Maintenance Manual (PM-P-OM260) or the Pierce Ultimate Configuration (PUC)
Pumpers Operation & Maintenance Manual (PM-P-OM420) as well as the pump manufacturer’s literature provided
with the unit.
5-9. Water Fording Capability
5-9.1 General Fording Instructions
Low engine tunnel designs in some Pierce Custom Chassis models locate the engine air intake at or below frame
level. This configuration restricts the ability of the vehicle to ford shallow water. Certain chassis components, such
as cooling fans and axle breathers, can also restrict the ability to ford water.
The depth of water that can be safely forded is affected by several factors including environmental and vehicle
configuration. Therefore no definitive fording capability can be established. Avoid depths of water which may partially
or fully submerge the axles.
Water fording is not recommended. Any depth of water which may partially submerge the axles or
greater is to be avoided. Water fording can cause component damage, corrosion, or catastrophic
failure to engine, transmission, and electrical systems.
Engine hydrostatic lock may result from water fording. Hydrostatic lock is caused by the entry of water
through the engine air intake system and/or water contamination of the fuel system. Water is drawn into
the engine and “lock-up” the engine. Hydrostatic lock most frequently occurs during or just after
fording. Hydrostatic lock may result in severe or catastrophic engine damage.
If the rear axle breathers are submerged for more than a brief period, drain and replace the lubricant.
See axle manufacturer’s lubrication specifications found in the Service Manual. After fording, lubricate
all grease fittings below the fording depth to displace water and contaminated grease. Failure to follow
these precautions may lead to premature wear or damage to the axles, suspension, and driveline
components.
For vehicles equipped with electromagnetic driveline retarders, turn off retarder before fording water.
Inspect for debris and grease unit before returning the vehicle to service after fording. Failure to follow
these precautions may lead to damage of the retarder.
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