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TM 5-4210-220-34
2-13.
FIRE PUMP - Continued
2-13.2
Wearing Ring.
This task covers
Repair
TOOLS
Batteries Disconnected
Shop Equipment, Automotive
(see TM 5-4210-220-12)
Maintenance and Repair,
Heat Shields Removed
NSN 4910-00-754-0705
(see TM 5-4210-220-12)
Pump Suction Pipe Removed
EQUIPMENT CONDITION
(see TM 5-4210-220-12)
Water Tank Drained (see TM 5-4210-220-12)
Main Engine Shutdown
MATERIALS/PARTS
(see TM 5-4210-220-12)
21, Appendix B Petroleum Jelly
APU Shutdown (see TM 5-4210-220-12)
UFP 5351/1 Suction Tube Gasket
REPAIR
(1)
Remove wearing ring (2) using two M10 x 1.5 flat-ended capscrews. Thread the two flat-ended capscrews
into the two tapped holes (4).
(2)
Tighten two capscrews evenly and remove wearing ring (2) from volute body (1).
(3)
Remove and discard gasket (3).
(4)
Examine volute body (1) and wearing ring (2) for cracks, corrosion, or warped flanges. Replace as
necessary.
(5)
Measure the internal diameter (A) of the
wearing ring (2) in several places. If
dimension (A) exceeds 7.025 in. (178.43
mm) at any of several points, the wearing
ring must be replaced. If the wearing ring is
to be replaced, it is recommended that the
impeller
wearing
diameter
is
also
measured. See para. 2-13.4 for procedure.
(6)
To
install
wearing
ring
(2),
apply
a
continuous bead of petroleum jelly (item 21,
Appendix B) to both sides of new gasket
(3).
(7)
Aline mounting holes in gasket (3) with
holes in wearing ring (2). Allow gasket to
stick to wearing ring.
(8)
Attach wearing ring (2) to volute body (1) using eight capscrews (M12 x 1.75 x 25 mm L). Tighten capscrews
to 90 ft lb (122 Nm). Make sure wearing ring is fitted with its sleeve towards the volute body (1).
(9)
Measure radial clearance between the impeller and wearing ring. The minimum clearance allowed is .006 in.
(0.15 mm).
(10) Remove capscrews and replace suction pipe (see TM 5-4210-220-12).
(11) After repairs have been made, test fire pump as detailed in para. 2-13.14.
2-95
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