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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
2-13.5
Carbon Seal and Seating Assembly.
This task covers Repair
TOOLS
MATERIALS/PARTS
Shop Equipment, Automotive
UFP 2301 O-ring
Maintenance and Repair,
UMP 9370 O-ring
NSN 4910-00-754-0705
UMP 9413 O-ring
EQUIPMENT CONDITION
Fire Pump Removed from Truck
(see TM 5-4210-220-12)
Volute Body Removed (see para. 2-13.3)
Impeller Removed (see para. 2-13.4)
Pump is made of aluminum alloy. Sealing surfaces will be damaged if pry bars or wedges are used to
disassemble components. When reassembling, do not force components into position or use fasteners to
brings parts together.
REPAIR
NOTE
If water leakage is noticed dripping out
of the drain hole in the pump head,
carefully examine three O-rings, and
carbon
seal.
Replace
parts
as
necessary.
(1)
Pull the carbon seal seating ring (2), sleeve
(6) and six springs (1) from pump shaft.
(2)
Remove and examine carbon seal (4), and
O-ring (5). If carbon seal face is scored, it
should be replaced along with the seating
ring (2). Replace O-ring (5).
(3)
To replace the O-ring (9), remove circlip (3)
and seating ring (2) from the sleeve (6).
Use extreme care to avoid scratching the
face of the seating ring.
(4)
Remove O-ring (8) from the inside of the sleeve (6). Replace with new.
(5)
Install new O-ring (9) onto sleeve (6), followed by seating ring (2). Lock into position with circlip (3).
(6)
Install carbon seal (4) and O-ring (5) in pump head seal housing.
(7)
Install carbon seal on the pump shaft and push fully home.
2-100
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