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Figure 20. Quarterly preventive maintenance services - continued - TM-5-4210-205-120094
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TM-5-4210-205-12 Truck Fire Fighting; Powered Pumper; Foam and Water 500 G.M.P.; Centrifugal Pump Power Take Off Driven; 400 Gal. Water Tank 40 Gal. Manual
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Section V. FIELD EXPEDIENT REPAIRS
Section IV. TROUBLESHOOTING
37. General
41. Water Pump Vibrates or Becomes Noisy
This  section  provides  information  useful  in
Probable cause
Possible remedy
diagnosing and correcting unsatisfactory operation or
Cavitation occurring.
Check  suction  pressure.
failure of the fire truck and its components.  Each
Relocate suction strainers
trouble symptom stated is followed by a list of probable
when pumping from draft.
causes  of  the  trouble.
The  possible  remedy
Reprime the pump (para.
recommended is described opposite the probable cause.
Any trouble beyond the scope of organizational
Pump vapor bound and not Temporarily reduce speed
maintenance  will  be  reported  to  direct  support
fully loaded.
or partially close discharge
maintenance.
valve.
38. Water Pump Capacity Drops
42.
Foam Pump Fails To Deliver Adequate Foam
Discharge
Probable cause
Possible remedy
Speed too low.
Adjust throttle.
Probable cause
Possible remedy
Water pump loses prime.
Clean dirty or replace dam
Foam concentrate supply is Refill foam tank (para. 18):
aged water line suction
exhausted.
screens.
Check for air
Foam concentrate tank
Open valve (para. 18).
leaks.  Submerge suction
valve is in closed position.
at deeper supply point.
Improperly adjusted foam
Adjust foam proportion
Reprime pump (para. 18).
proportion regulating
regulating valve (para.
Fire truck too high to per-
Change position of fire
valve.
19).
mit pump suction.
truck.
Water lines loose or defec-
Tighten or replace lines.
43. Foam Does Not Have Proper Characteristics For
tive.
Effective Use
39.
Water Pump Fails To Deliver Water Upon
Probable cause
Possible remedy
Improperly adjusted foam
Adjust foam proportion
Starting
proportion regulating
regulating valve (para. 19).
Probable cause
Possible remedy
valve.
Positive suction lacking.
Inspect for air leaks in the
Change in characteristics of
Adjust foam proportion
suction lines or at the
water regarding mineral
regulating valve to
suction hose strainer when
content,
components (para. 19).
pumping from draft.  See
Improper nozzle.
Change nozzle.
that suction hose is 2 feet
Foam concentrate liquid
Drain and flush foam system
below  surface  of  open
supply is diluted or
Fill with concentrate
water. Reprime (para. 18).
contaminated.
of proper quality (para. 20).
Lift required beyond pumps Draw supply from different
capacity.
source or change position
44.
Hose Reel Assemblies Stick and Bind When
of fire truck.
Reeling or Unreeling Hose
Water discharge valve
Open water discharge valve.
Probable cause
Possible remedy
closed.
Insufficient lubrication of
Lubricate as specified in
Discharge head requires
Increase engine speed.
hose reel shaft bearings or  LO 5-4210-205-12 and
higher pump speed.
badly worn bearings.
replace a badly worn bear
40.
Pump Clutch Lever Is Hard or Impossible to
ing.
Report to direct,
general support, and depot
Engage
maintenance.
Probable cause
Possible remedy
Hose reel assemblies
Replace hose reel (para.
Improper linkage or clutch
Adjust clutch or linkages as
damaged or defective.
123).
adjustment.
necessary (para. 126).
Disconnected, worn, or bent Connect, repair, or replace
45. Hose Reel Assemblies Inoperative
linkage.
faulty parts (para. 126).
Probable cause
Possible remedy
Replace relay (para. 103).
defective.
Hose reel switch defective.
Replace switch (para. 102).
Hose reel assemblies
Replace hose reel (para.
Damaged or defective.
123).
TAGO 6839A
41

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