TM 5-4310-451-14
5-65. BLOWER DRIVE SUPPORT MAINTENANCE (Cont.)
WARNING
Compressed air used for cleaning or drying purposes, or for clearing restrictions, should
never exceed 30 psi (207 kPa). Wear protective clothing (goggles/shield, gloves, etc.) and
use caution to avoid Injury to personnel.
2.
Dry parts, except thrust bearings, with compressed air. Let thrust bearings air dry.
3.
Ensure that oil passages are clear.
4.
Inspect threads for damage. Replace parts if damaged.
5.
Check that thrust washer thickness is between 0.2300-0.2500 in. (5.8420-6.3500 mm). Inspect thrust washer for
scoring.
6.
Check that thickness of two thrust bearings Is between 0.0590-0.0610 in. (1.4986-1.5494 mm). Inspect thrust
bearings for scoring.
7.
Check that inside diameter of support bushing is between 1.6260-1.6265 in. (41.3004-41.3131 mm). Record
diameter.
8.
Check diameter of hub at base. It must be between 1.6240-1.6250 in. (41.2496-41.2750 mm). Record diameter.
9.
Subtract diameter recorded in step 7 from diameter recorded in step 8. Ensure that maximum clearance between
drive hub and support bushing is 0.
in. (0.127 mm).
10.
If support bushing is worn beyond limits in step 7, replace bushing.
11.
Inspect drive gear teeth for scoring, pitting, and burning (blue or dark spots). Replace if teeth are defective.
12.
Inspect drive hub for cracks, breaks, stripped threads or worn-out splines in bore. Replace if damaged.
13.
Inspect both plates for cracks, distortion, and other damage. Replace if defective.
d. ASSEMBLY
1.
If removed, install two bushings (21) flush into drive gear (7) and apply a light coat of oil to bushings.
2.
Apply a light coat of lubricating oil to drive support (17), thrust bearings (18 and 19), and thrust washer (20).
3.
Install thrust bearing (18) onto drive support (17).
4.
Install drive gear (7), flat side toward drive support (17).
5.
Install thrust bearing (19) and thrust washer (20).
6.
Install new lockwasher (15).
7.
Install nut (16), with flat side down facing lockwasher, and torque nut to 50-60 lb.-ft. (68-81 Nìm).
8.
Measure clearance between thrust washer (20) and thrust bearing (19). Clearance must not be less than 0.005 in.
(0.27 mm) or more than 0.012 in. (0.305 mm).
5-241
