TM 10-4930-351-14
0090 00
INSTALLATION
1.
Install O-rings (5 and 6) on diffuser case (4).
2.
Install O-ring (14) on check valve seat (13).
3.
Lubricate the check valve seat (13) and insert in diffuser case (4), aligning slot in check valve seat (13) with pin holes in
diffuser case (4).
4.
Install inner pin (12) through holes in diffuser case (4) and slot in check valve seat (13).
NOTE
The flapper valve is a butterfly valve designed to open when fuel pump full flow has been attained. The
springs appear to be identical when installed; the difference can be seen only when the springs have been
removed. The springs are properly installed when the flapper valve matches the one shown in the figure
inset.
5.
Hold two halves of flapper valve (8) on flat surface and assemble spring (11) and springs (10) as shown in the
illustration inset. Insert one small plastic spacer (9) between the upper arms of the flapper valve (8) and one between the
lower arms of the flapper valve (8). Insert the outer pin (7) through the flapper arm spacers (9) and springs (10 and 11).
6.
Install flapper valve (8) as an assembly (7, 8, 9, 10, and 11) in diffuser case (4). Ensure that small plastic spacers (9) are
arranged as indicated with one spacer captured by spring at each end and two spacers outside the spring at each end.
Hold spacers in place and adjust outer pin (7) to install first the lower end of outer pin (7) and then upper end of outer
pin (7). Adjust outer pin (7) position as necessary to fit flush with diffuser case (4) at either end.
7.
Align bolt holes in outlet (3) and diffuser case (4), and install outlet (3) on diffuser case. Secure with three hex head
screws (1) and flat washers (2). Torque to 75-80 in-lbs.
END OF WORK PACKAGE
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