TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 757 of 953
7-18. PROPORTIONING VALVE REPLACEMENT This task covers: a. Removal b. Installation INITIAL SETUP: Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Materials/Parts Locknut (Appendix G, Item 128) Lubricating oil (Appendix C, Item 33) Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equipment Condition • Battery ground cable disconnected (para. 4-73). • Hood raised and secured (TM 9-2320-280-10). CAUTION • Prior to removal, tag brake lines for installation. • Cover or plug all open lines and connections immediately after disconnection to prevent contamination. Remove all plugs prior to connection. • Do not attempt to disassemble proportioning valve. Damage to equipment will result. NOTE Have drainage container ready to catch brake fluid. 1. Disconnect electrical connector (1) from proportioning valve (6). 2. Disconnect two brake lines (5) from proportioning valve (6). 3. Disconnect two brake lines (4) from proportioning valve (6). 4. Remove locknut (2), washer (3), and proportioning valve (6) from hydro-boost (8) and proportioning valve bracket (7). Discard locknut (2). 1. Install proportioning valve (6) to proportioning valve bracket (7) and hydro-boost (8) with washer (3) and locknut (2). Tighten locknut (2) to 22 lb-ft (30 N•m). 2. Connect two brake lines (5) to proportioning valve (6). 3. Connect two brake lines (4) to proportioning valve (6). 4. Apply lubricating oil to pins (9) of proportioning valve (6). 5. Connect electrical connector (1) to proportioning valve (6). b. Installation a. Removal TM 9-2320-280-20-2 7-44 Change 3