Chapter 2. GENERAL MAINTENANCE INSTRUCTIONS

CHAPTER 2

GENERAL MAINTENANCE INSTRUCTIONS

Section I. SPECIAL TOOLS AND EQUIPMENT

6. Specially Designed Tools

5. Special Tools and Equipment

No specially designed tools are required by direct

No special tools or equipment are required by direct

support, general support, and depot maintenance

personnel for maintenance of the firetruck.

Section II. TROUBLESHOOTING

Water pump impeller vanes ..

Clean blades (para. 56).

7. General

fouled with foreign matter.

Relief valve control defective.

Replace or repair defective

This section provides information useful in

relief valve (paras.

diagnosing and correcting unsatisfactory operation or

32-34).

failure of the pumping unit or any of its components.

Each trouble symptom stated is followed by a list of

11. Pumping Unit Will Not Produce Foam

probable causes of the trouble. The possible remedy

Probable cause

Possible remedy

recommended is described opposite the probable cause.

Metering valve defective .......

Replace or repair foam

metering valve (paras.

8. Water Pump Will Not Operate

38-40).

Defective foam valve ............ Replace or repair foam

Probable cause

Possible remedy

valve (paras. 35-37).

Pump impeller shaft damaged

Repair or replace impeller

Foam lines damaged or broken Replace defective foam

shaft (paras. 55-57).

lines (paras. 17-19).

Pump gearbox damaged .......

Replace or repair gearbox

(paras. 49-51).

12. Hose Reel Inoperative

Key sheared in pump drive

Replace or repair key

(paras. 49-51).

Probable cause

Possible remedy

Drum will not turn ................

Replace or repair shaft

9. Water Pump Fails To Prime or Loses Prime

bearings or defective

drum (paras. 59-61).

Probable cause

Possible remedy

Sprocket teeth broken .......... Replace or repair defective

Primer pump defective .........

Replace or repair primer

sprocket (paras. 59-61).

pump (paras. 42-44).

Drive motor or chain defective

Replace motor or chain

Primer valve defective ..........

Replace or repair primer

(TM 5-4210-205-12).

valve (paras. 45-47).

Microswitch defective ...........

Replace microswitch (TM

13. Water Tank Leaks or Fails To Drain Properly.

5-4210-205-12).

Air leaks

Repair or replace leaking

Probable cause

Possible remedy

pipes or fittings (paras.

Defective drain valve ............

Repair drain valve (paras.

17-19).

26-28).

Drain filled with foreign matter

Remove cover and clean

10. Water Pump Fails To Deliver Rated Flow or Develop

draining system (paras.

Desired Pressure

63-65).

Discharge line damaged ...... Remove cover and replace

Probable cause

Possible remedy

discharge line (paras.

Relief valve defective ...........

Replace or repair defective

63-65).

relief valve (paras.

52-54).

Water pump impeller defective Replace impeller (paras.

55-57).

TAGO 5947-A