TM 9-2320-280-20-2
7-14. HYDRO-BOOST REPLACEMENT
This task covers:
a. Removal
b. Installation
INITIAL SETUP:
Tools
Personnel Required
General mechanic’s tool kit:
One mechanic
automotive (Appendix B, Item 1)
One assistant
Materials/Parts
Manual References
Cotter pin (Appendix G, Item 20)
TM 9-2320-280-24P
Spring washer (Appendix G, Item 236)
Four lockwashers (Appendix G, Item 120)
Equipment Condition
Master cylinder removed (para. 7-13).
a. Removal
CAUTION
Cover or plug all open lines and connections immediately after
disconnection to prevent contamination. Remove all plugs prior to
connection.
N O TE
Have drainage container ready to catch brake fluid.
1. Mark and disconnect two high pressure lines (4) and one return line (5) from hydro-boost (6).
2. Remove cotter pin (3), washer (2), and disconnect pushrod (7) from brake pedal bellcrank (13).
Remove spring washer (1) from brake pedal bellcrank (13) and discard cotter pin (3) and spring
washer (1).
3. Remove four nuts (12), lockwashers (11), washers (10), hydro-boost (6), and gasket (8) from cowl (9).
Discard lockwashers (11).
b. Installation
1. Install gasket (8) and hydro-boost (6) on cowl (9) with four washers (10), lockwashers (11), and
nuts (12).
2. Install spring washer (1) on brake pedal bellcrank (13). Connect hydro-boost pushrod (7) to brake
pedal bellcrank (13). Install washer (2) and cotter pin (3).
3. Tighten nuts (12) to 21 lb-ft (28 Nom).
4. Connect two high pressure lines (4) and one return line (5) to hydro-boost (6).
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