Air Compressor Drive Replacement and Repair

TM 9-2320-363-34-1 · Chapter 3 — Power Package Maintenance

This task covers: a. Removal b. Disassembly c. Cleaning d. Repair e. Assembly f. Inspection

                    g. Installation

Tools and Special Equipment:                      References:

Shop Equipment, SC 4910-95-CL-A31                 TM 9-2320-363-20
Tool Kit, SC 5180-90-CL-N05
Air Compressor Service Set, J38310-A              Equipment Condition:
Holding Fixture, Appendix C, Item 2
                                                  Reference              Condition Description
Materials/Parts:
                                                  TM 9-2320-363-20       Air Compressor
Gasket                  P/N 8929299                                      Removed
Bearing                 P/N FPF22264              Page 7-2               Power Steering Pump
                                                                         Removed

                                              NOTE
       If necessary, use soft-nosed mallet to tap air compressor drive to aid in removal.

1.     REMOVE SIX BOLTS (1) AND AIR COMPRESSOR DRIVE (2) FROM GEAR HOUSING ASSEMBLY (3).

2.     REMOVE AND DISCARD GASKET (4).

TM page 3-93

Illustration from TM 9-2320-363-34-1 (PDF page 169)

1. SECURE HOLDING FIXTURE (1) IN VISE.

2. POSITION AIR COMPRESSOR DRIVE (2) ON HOLDING FIXTURE (1), ENGAGING INTERNAL TEETH OF DRIVE HUB WITH HOLDING FIXTURE HUB.

3. LOOSEN FOUR DRIVE GEAR RETAINING BOLTS (3).

4. TURN AIR COMPRESSOR DRIVE (2) OVER AND POSITION AIR COMPRESSOR DRIVE (2) ON HOLDING FIXTURE (1), ENGAGING INTERNAL TEETH OF DRIVE GEAR WITH HOLDING FIXTURE HUB.

5. REMOVE DRIVE HUB RETAINING NUT (4), DRIVE HUB (5), AND SPACER RING (6) FROM DRIVE SHAFT (7).

TM page 3-94

Illustration from TM 9-2320-363-34-1 (PDF page 170)

6. REMOVE AIR COMPRESSOR DRIVE HOUSING (8) FROM HOLDING FIXTURE AND PLACE ON BENCH.

7. REMOVE FOUR DRIVE GEAR RETAINING BOLTS (3) AND DRIVE GEAR (9) FROM DRIVE SHAFT FLANGE (10).

CAUTION Remove and discard ball bearing assembly whenever drive shaft is removed. Failure to do so may cause damage to equipment.

8. PLACE AIR COMPRESSOR DRIVE HOUSING (8) ON PRESS BED, AS SHOWN. PRESS DRIVE SHAFT (7) OUT OF BALL BEARING ASSEMBLY.

TM page 3-95

Illustration from TM 9-2320-363-34-1 (PDF page 171)

9. REMOVE BEARING RETAINING RING (11) FROM AIR COMPRESSOR DRIVE HOUSING (8).

10. SUPPORT AIR COMPRESSOR DRIVE HOUSING (8) ON PRESS BED, AS SHOWN. USING NARROW END OF BALL BEARING INSTALLER (12) FROM SERVICE SET, PRESS BEARING (13) FROM HOUSING. DISCARD BALL BEARING ASSEMBLY.

TM page 3-96

Illustration from TM 9-2320-363-34-1 (PDF page 172)

Use general cleaning methods to clean all parts (page 2-30).

Use general repair methods to repair damaged parts (page 2-33).

CAUTION Do not remove plastic sleeve from bail bearing before installation. Sleeve will be pushed out when drive shaft is installed.

1. SUPPORT AIR COMPRESSOR DRIVE HOUSING (1) ON PRESS BED, AS SHOWN. USING WIDE END OF BALL BEARING INSTALLER (2) FROM SERVICE SET, PRESS NEW BEARING (3) AND PLASTIC SLEEVE (4) INTO AIR COMPRESSOR DRIVE HOUSING (1) UNTIL BEARING (3) OUTER RACE IS FIRMLY SEATED AGAINST AIR COMPRESSOR DRIVE HOUSING (1) SHOULDER.

TM page 3-97

Illustration from TM 9-2320-363-34-1 (PDF page 173)

NOTE

Make sure bearing retaining ring is completely seated in air compressor drive groove.

2. INSTALL BEARING RETAINING RING (5), BEVELED FACE UP, IN AIR COMPRESSOR DRIVE HOUSING (1) GROOVE.

3. PLACE WIDE END OF BALL BEARING INSTALLER (2) FROM SERVICE SET ON PRESS BED. PLACE AIR COMPRESSOR DRIVE (6) ON BEARING INNER RACE AND ONTO NARROW ENDOF BALL BEARING INSTALLER (2).

NOTE

Make sure face of ball bearing installer is centered on bearing inner race so it does not obstruct removal of plastic sleeve as drive shaft is pressed into bearing.

4. POSITION DRIVE SHAFT (7) IN BEARING INNER RACE CAREFULLY. PRESS DRIVE SHAFT (7) INTO BEARING UNTIL DRIVE SHAFT SHOULDER IS FIRMLY SEATED AGAINST BEARING INNER RACE. REMOVE AIR COMPRESSOR DRIVE (6) FROM BALL BEARING INSTALLER (2) AND REMOVE PLASTIC SLEEVE FROM INSIDE INSTALLER (2). DISCARD PLASTIC SLEEVE.

TM page 3-98

Illustration from TM 9-2320-363-34-1 (PDF page 174)

NOTE Do not use lubricant on threads of bolts or drive gear flange.

5. PLACE AIR COMPRESSOR DRIVE (6) ON BENCH, AS SHOWN. POSITION DRIVE GEAR (8) ON DRIVE SHAFT (7) FLANGE AND ALINE BOLT HOLES. INSTALL FOUR BOLTS (9) HAND-TIGHT.

6. SECURE HOLDING FIXTURE (10) IN VISE. INSTALL AIR COMPRESSOR DRIVE (6) ON HOLDING FIXTURE (10), ENGAGING INTERNAL TEETH OF DRIVE GEAR (8) WITH HOLDING FIXTURE (10) HUB.

7. SEAT SPACER RING (11) ON DRIVE SHAFT (7) AGAINST BEARING INNER RACE.

NOTE Do not use lubricant on threads of shaft or retaining nut.

8. PLACE DRIVE HUB (121 ON DRIVE SHAFT (7) AND INSTALL RETAINING NUT (13). TIGHTEN RETAINING NUT TO 220-255 LB-FT (300-345 N.m).

TM page 3-99

Illustration from TM 9-2320-363-34-1 (PDF page 175)

9. TURN AIR COMPRESSOR DRIVE (6) OVER. POSITION AIR COMPRESSOR DRIVE (6) ON HOLDING FIXTURE (10), ENGAGING INTERNAL TEETH OF DRIVE HUB WITH HOLDING FIXTURE HUB. TIGHTEN BOLTS (9) TO 43-54 LB-FT (58-73 N.m).

1. REMOVE AIR COMPRESSOR DRIVE ASSEMBLY (1) FROM HOLDING FIXTURE. POSITION AIR COMPRESSOR DRIVE ASSEMBLY (1) ON SUITABLE FLAT SURFACE, AS SHOWN.

2. MEASURE DRIVE GEAR (2) BY ZEROING DIAL INDICATOR. ROTATE DRIVE GEAR (2) TWO FULL REVOLUTIONS. AS DRIVE GEAR IS ROTATED, DIAL INDICATOR MAY REGISTER TO LEFT AND RIGHT OF ZERO. TOTAL DIAL INDICATOR NEEDLE MOVEMENT EQUALS TOTAL INDICATED RUNOUT (TIR). MAXIMUM ALLOWABLE TIR IS 0.003 IN. (0.08 mm).

TM page 3-100

Illustration from TM 9-2320-363-34-1 (PDF page 176)

NOTE Make sure all old gasket material from air compressor drive assembly mounting flange and gear housing mating area is removed. If necessary, rotate drive gear slightly to engage gear teeth of bull gear and fully seat pilot ring of air compressor-drive in gear-housing.

1. POSITION NEW GASKET (1) ON FLANGE OF AIR COMPRESSOR DRIVE (2). POSITION AIR COMPRESSOR DRIVE (2) ON GEAR HOUSING (3).

2. INSTALL FIVE BOLTS (4). INSTALL SHORTER BOLT (5) IN 1 O’CLOCK POSITION WHEN VIEWED FROM AIR COMPRESSOR END OF AIR COMPRESSOR DRIVE (2). TIGHTEN BOLTS TO 43-54 LB-FT (58-73 N.m).

NOTE Follow-on Maintenance: Install power steering pump (Page 7-2). Install air compressor (TM 9-2320-363-20).

TM page 3-101