TM-9-2320-280-20 HMMWV Technical Manual Unit Maintenance Volume 2 Download
Page 166 of 953
3-82. DRIVEBELTS ADJUSTMENT This task covers: a. Power Steering Belt Adjustment b. Alternator Belt Adjustment a. Power Steering Belt Adjustment INITIAL SETUP: Applicable Models All vehicles except: M997A2, M1025A2, M1035A2, M1043A2, M1045A2, M1097A2, M1123 Tools General mechanic’s tool kit: automotive (Appendix B, Item 1) Special Tools Belt tension gauge (Appendix B, Item 67) Materials/Parts Locknut (Appendix G, Item 70) Personnel Required One mechanic One assistant Manual References TM 9-2320-280-10 TM 9-2320-280-24P Equiment Condition • Hood raised and secured (TM 9-2320-280-10). • Battery ground cable disconnected (para. 4-73). 1. Remove locknut (5), washer (6), capscrew (2), spacer (4), and two clamps (3) from return and control valve hoses (7) and (8) and alternator bracket (1). Discard locknut (5). 2. Loosen three capscrews (15) from power steering pump bracket (16) and support brackets. CAUTION Do not pry against power steering pump housing with pry bar when adjusting belt tension. Pump could be damaged. NOTE There are two square holes in the power steering pump bracket, one in front, accessible from above; and one in back, accessible from under the vehicle. Either can be used to adjust belt tension. 3. Adjust power steering belt set (9) using 1/2-inch breaker bar in square hole of power steering bracket (16). Apply force until belt set (9) appears tight and tighten capscrews (15). 4. Using belt tension gauge, check each belt individually for proper tension, refer to table 3-2, Belt Tension Requirements. 5. If belt set (9) tension is correct, tighten three capscrews (15) on power steering pump bracket (16) to 40 lb-ft (54 N•m). If not, repeat steps 2 through 5. If tension cannot be properly adjusted, replace belt set (9) (para. 3-80). 6. Install return and control valve hoses (7) and (8) to alternator bracket (1) with spacer (4), two clamps (3), capscrew (2), washer (6), and locknut (5). Tighten locknut (5) to 8 lb-ft (11 N•m). b. Alternator Belt Adjustment 1. Loosen capscrew (11) and two capscrews (13.1) on alternator (13) and alternator bracket (14). TM 9-2320-280-20-2 3-140 Change 3 NOTE Prior to making any belt adjustments, check belt tension with belt tension gage. Drivebelt adjustment should only be done if belt tension is below 70 lbs (32 kg). Check alternator belts from above engine; power steering belts from under vehicle. Adjusting power steering belts can affect alternator belt tension. Always check alternator belt tension after adjusting power steering belts. To adjust air-conditioning belt, refer to para. 11-202.