TM 9-4120-402-14
5-9. EVAPORATOR AND CONDENSER FAN MOTOR (B2) REPAIR. - continued
CAUTION
Bearings are permanently lubricated and sealed at the time of manufacture. Do not attempt to
clean or relubricate them. Keep bearings in plastic bags or wrap securely in grease-proof paper
until needed for reassembly.
7
Remove ball bearing (5).
8 Remove shim (17) and closing shim (18).
Inspect for excessive wear, nicks, or breakage.
Replace if
damaged.
9
Inspect frame/stator (6) for broken or cracked flange, stripped threads, visible damage, shorted windings (para
10 Inspect rotor/shaft (16) for evidence of overheating. Replace rotor/shaft if overheating is evident.
11 Inspect rotor/shaft (16) for nicks, gouges, and deformation. Dress high metal defects in shaft with a fine file or
stone. If shaft is beyond repair, replace rotor/shaft.
12 Coat shaft surfaces of rotor/shaft (16) with oil (MIL-L-2104, Grade 20).
13 Coat closing shims (18 and 10), two spring wave washers (15) and shims (17, 14, 13, 12, and 11) with oil (MIL-
L-2104, Grade 20).
14 Coat bearing cavity of frame/stator (6) and end cap (7) with oil (MIL-L-2104, Grade 20).
15 Install closing shim (18), shim (17), and new ball bearing (5) into frame/stator (6).
16 Carefully insert rotor/shaft (16) into frame/stator (6) and slip shaft into ball bearing.
17 Slip ball bearing (4), two spring wave washers (15), shims (14, 13, 12, and 11), and closing shim (10) onto
rotor/shaft (16).
18 Carefully slip end cap (7) onto rotor/shaft (16) keeping the match-marks made at time of disassembly in
alignment. Secure with six sets of screws (8) and lock washers (9). Before final tightening, check for freedom
of rotation by turning shaft by hand. There should be no drag or binding. Correct as necessary and tighten
screws. Check again for binding and drag.
19 Check end play of shaft. End play should be 0.002 -0.005 inch (0.051 - 0.127 mm). If end-play is not within
limits, disassemble motor and add or remove shims to adjust. Check again for binding or drag.
5-28
