TM 9-4110-256-14
4-41.
SHEAVE REPLACEMENT.
This task covers: a. Removal
b. Installation
INITIAL SETUP
General Safety Instructions:
Equipment Conditions:
Refrigeration unit shut down (para 2-7) and power
disconnected.
WARNING
Condenser fan removed (para 4-37).
V belt removed (para 4-36).
High voltage and exposed rotating
Materials/Parts:
parts are used in the refrigeration unit.
Lock Washers (4)
Personal injury can result if power is
16, Appendix G
connected.
Lock Washers (6)
13, Appendix G
a. Removal.
(1)
Remove four bolts (1), lock washers (2), and flat washers (3) from flange bearing (4).
Discard lock
washers.
(2)
Remove six bolts (5), lock washers (6), top support (7), and bottom support (8). Discard lock washers.
(3)
Loosen two set screws (9) and remove flange bearing (4) from fan drive shaft (10).
(4)
Remove three bolts (11) and install two bolts back into threaded holes in bushing (12). Tighten bolts
evenly to separate bushing from sheave (13). Remove two bolts from bushing.
(5)
Slide bushing (12) and sheave (13) off fan drive shaft (10) being careful not to lose keys (14) and (15).
Remove keys.
b. Installation.
(1)
Install key (15) then slide sheave (13) and bushing (12) onto fan drive shaft (10). Aline bushing over key.
(2)
Install key (14) then aline sheave (13) with key and slide onto bushing (12).
(3)
Install three bolts (11) and tighten evenly to secure sheave (13) to bushing (12).
(4)
Install top support (7) and bottom support (8) around fan drive shaft (10). Secure using six new lock
washers (6) and bolts (5).
(5)
Align flange bearing (4) mounting holes and install four flat washers (3), new lock washers (2), and bolts (1)
onto flange bearing.
(6)
Tighten two set screws (9) against flat surfaces on fan drive shaft (10).
4-86
