TM 9-4520-251-14
4-52 FAN BEARING
This task covers:
a. Removal
b. Inspection
c. Repair/installation
INITAL SETUP
Tools
Equipment Condition
Tool kit, service, refrigeration unit
4–51
(Appendix B, Section Ill, Item 1)
Materials/Parts
Fan bearing
Para
Condition Description
Vaneaxial fan removed.
Location/Item
Action
Remarks
REMOVAL
1. Casting
2. Pulley and
key
3.
Fan ring,
bracket, and
bearing
INSPECTION
4. Fan bearing,
support, and
hub
5. Fan bearing
rotation
Loosen setscrew (1) and
remove casting (2).
Loosen setscrew (3) and
remove pulley (4) and key
(5). Retain parts for
reassembly.
Remove screws (6), washers
(7 and 8), and nuts (9).
Separate fan ring (10) and
bracket (11) and lift out
fan bearing (12) with
attached support (13) and
hub (14).
Fan bearing (12) is press fitted to support (1 3),
and hub (14) is heat–shrunk onto shaft (15) of
the fan bearing. Check for sign that either fan
bearing or hub has slipped and may be coming
loose. If defect appears, forward to direct sup–
port maintenance for replacement.
Rotate shaft (15) and note noise, wear, and ex–
cessive end play. If defective, forward to direct
support maintenance for replacement.
4-129
