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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
2-13.11 Disengaging Unit.
This task covers
Repair
TOOLS
MATERIALS/PARTS
Shop Equipment, Automotive
22, Appendix B Pipe Sealant
Maintenance and Repair,
UFP 2290 O-ring
NSN 4910-00-754-0705
UFP 5954 Diaphragm
EQUIPMENT CONDITION
Fire Pump Removed from Truck
(see TM 5-4210-220-12)
REPAIR
NOTE
If
disengaging
unit
diaphragm
is
damaged, water will be seen dripping
from disengaging unit upper flange.
(1)
Loosen gear clamps (1) and remove hose
(2) from between suction elbow (3) and
priming valve (4).
(2)
Disconnect and remove priming return
spring (5).
(3)
Swing the water ring primer (6) upwards,
and allow it to hang by the fulcrum pin on
the front of the pump.
(4)
Disconnect the union nut (10) on the under
side of the disengaging unit (7).
(5)
Unscrew the disengaging unit (7) from the
bearing housing.
(6)
Remove lift-off pipe (11) if necessary. If lift-
off pipe is removed, pull washer (12) and O-
ring (13) from pump body. Replace O-ring
(13).
(7)
To
disassemble
disengaging
unit,
first
remove circlip (15) and washer (16). Pull
plastic cap (17) from diaphragm cover (23).
(8)
Remove six nuts (19), lockwashers (20) and
flatwashers (21).
(9)
Separate the diaphragm cover (23) from the
diaphragm housing (28).
2-116
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