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Table 1-1. Repair and Replacement Standards
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TM-5-4210-213-35 Truck Firefighting: Powered Pumper: Foam and Water 500-GPM Capacity; Centrifugal Pump Power Takeoff Driven Manual
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Section III. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS
CHAPTER 2
GENERAL MAINTENANCE INSTRUCTIONS
Section I. SPECIAL TOOLS AND EQUIPMENT
2-2. Specially Designed Tools
2-1. Special Tools and Equipment
Excluding the Model M45A2 Truck Chassis, no specially
Excluding the Model M45A2 Truck Chassis, no special
designed tools and equipment are required by direct and
tools or test equipment are required by direct and
general support and depot maintenance personnel for
general support and depot maintenance personnel for
performing maintenance on the Ward LaFrance Model
performing maintenance on the Ward LaFrance Model
M45A2WLF Fire Truck.
M46A2WLF Fire Truck.
Section II. TROUBLESHOOTING
of its components.  Each trouble symptom stated is
2-3. General
followed by a list of probable causes.
This section provides information useful in diagnosing
The  possible  remedy  recommended  is  described
and correcting unsatisfactory operation or failure of the
opposite the probable cause.
pumping unit or any
2-4. Fire Pump will not Operate
Probable Cause
Possible Remedy
Pump impeller shaft damaged................................................Repair or replace impeller shaft (para 3-16 and table
.
.
Pump gear box damaged........................................................Replace or repair gear box (para 3-14)
.
Key sheared in pump drive.....................................................Replace key (para 3-14)
.
.
2-5. Fire Pump Fails to Prime or Loses Prime
Probable Cause
Possible Remedy
Primer pump defective............................................................. eplace or repair primer (para 3-11)
R
Primer valve defective ............................................................. eplace or repair primer valve (para 3-12)
R
Micro-switch defective.............................................................. eplace micro-switch (TM 54210-213-12)
R
Air leaks ................................................................................Repair or replaceleaking pipes or fittings (para 3-2)
.
2-6. Fire Pump Fails to Deliver Rated Flow or Develop Desired Pressure
Probable Cause
Possible Remedy
Relief valve defective .............................................................. eplace or repair defective relief valve (para 3-15)
R
Fire pump impeller defective...................................................Replace impeller (para 3-16)
.
Fire pump impeller vanes fouled with foreign matte................. lean blades (para 3-14)
.r
C
Relief valve control defective..................................................Replace or repair defective relief valve (para 3-7)
.
2-7. Pumping Unit will not Produce Foam
Probable Cause
Possible Re edy
m
Metering valve defective.........................................................Replace or repair foam metering valve (para 3-9)
.
Defective foam valve .............................................................. eplace or repair foam valve (para 3-8)
R
Foam lines damaged or broken............................................... eplace defective foam lines (para 3-2)
.
R
2-1

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