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TM 55-2915-335-30&P
2-25. FUEL BOOST PUMP /CARTRIDGE - FINAL TEST (Cont)
2-25
4.
e.
f.
Make sure that a drain plug is installed in the
cartridge drain port. If none is present, reference
the aircraft manual for correct plug with packing.
When installing plug, hold pump cover (13) with a
wrench to keep it from turning.
NOTE
The following paragraph applies to instal-
lation procedures for boost pump
cartridge only. If installing an assembled
cartridge and housing, continue to
paragraph 5.
INSTALLATION IN TEST TANK - BOOST PUMP
CARTRIDGE
a.
b.
c.
d.
Apply pressure directly over valve
spring when opening or closing valve
stem assembly. Trying to compress
valve spring from free end of valve
arm
will cause
valve
arm to
bend, When removing or installing
shoulder screw, keep valve arm
depressed.
Apply a thin, even coating of petrolatum (Item 6,
Appendix C) to preformed packings (12). Install
smaller preformed packing into top groove, and
remaining packings in lower grooves.
Slide pump cartridge (1) half way into test tank
dummy housing. Align matchmarks on cartridge
and test tank housing. Using thumb presure only,
press cartridge into housing until seated.
Install retaining ring (3) in ring groove. Press
retaining ring into groove, a little at a time, with
index finger.
Remove shoulder screw (14) from cartridge. Line
up inlet valve stem (15) with shoulder screw hole.
Place thumb on inlet valve stem (15) above spring.
Press valve stem in toward pump housing. Install
shoulder screw (14) to secure stem in place and
keep inlet valve open.
e. Make sure that drain plug is installed in the
cartridge drain port. If none is present reference
the aircraft manual for correct plug with packing.
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