Chapter 2. GENERAL MAINTENANCE INSTRUCTIONS

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

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

1-1).

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)

Primer valve defective ............................................................. eplace or repair primer valve (para 3-12)

Micro-switch defective.............................................................. eplace micro-switch (TM 54210-213-12)

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)

Fire pump impeller defective...................................................Replace impeller (para 3-16)

Fire pump impeller vanes fouled with foreign matte................. lean blades (para 3-14)

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

Metering valve defective.........................................................Replace or repair foam metering valve (para 3-9)

Defective foam valve .............................................................. eplace or repair foam valve (para 3-8)

Foam lines damaged or broken............................................... eplace defective foam lines (para 3-2)

2-1