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Table 1. Time Standards
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TM-5-4210-205-35 Truck Firefighting Powered Pumper; Foam and Water 500-GPM; Centrifugal Pump Power Takeoff Driven Manual
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Section III. REMOVAL AND INSTALLATION OF MAJOR COMPONENTS OR AUXILIARIES
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
support, general support, and depot maintenance
personnel for maintenance of the firetruck.
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
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
Defective foam valve ............  Replace or repair foam
Probable cause
Possible remedy
Pump impeller shaft damaged
Repair or replace impeller
Foam lines damaged or broken Replace defective foam
Pump gearbox damaged .......
Replace or repair gearbox
12. Hose Reel Inoperative
Key sheared in pump drive
Replace or repair key
Probable cause
Possible remedy
Drum will not turn ................
Replace or repair shaft
9. Water Pump Fails To Prime or Loses Prime
bearings or defective
Probable cause
Possible remedy
Sprocket teeth broken ..........  Replace or repair defective
Primer pump defective .........
Replace or repair primer
Drive motor or chain defective
Replace motor or chain
Primer valve defective ..........
Replace or repair primer
(TM 5-4210-205-12).
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.
Drain filled with foreign matter
Remove cover and clean
10. Water Pump Fails To Deliver Rated Flow or Develop
draining system (paras.
Desired Pressure
Discharge line damaged ......  Remove cover and replace
Probable cause
Possible remedy
discharge line (paras.
Relief valve defective ...........
Replace or repair defective
relief valve (paras.
Water pump impeller defective Replace impeller (paras.
TAGO 5947-A
4

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