Figure 4-14. Balancer Installation - OH-13 and TH-I3 Helicopter Engine Fan Assembly.

TM 55-4920-201-14

coupling

d. Install

quick-disconnect

b. Carefully install engine fan assembly (3,

(7HEL053 or 7A050 kit) on arbor suspension

figure 4-14), pulleys downward, over top end of

coupler, and suspend entire assembly free of in-

arbor. Insure that flange of pilot bushing (l) enters

terference. Note balance condition indicated by

fan hub bearing sleeve and seats squarely on outer

black indicator disc at top end of the arbor.

race of fan hub bearing.

e. For balance tolerance and application of

c. Install sleeve (5), flange downward, over

balance corrections, refer to applicable helicopter

top end of balancing arbor, and seat firmly on top

manual. (Refer to appendix A.)

surface of fan hub bearing inner race. Lock sleeve

in this position by moderate and uniform tightening

of two sleeve setscrews (4), using 3/32-inch hex

1. Pilot bushing (2533,

7HEL053 kit)

2. Pilot bushing setscrew

3. Engine fan assembly

4. Sleeve setscrew

5. Bushing (2530, 7HEL053

kit)

6. Balancing arbor 2516,

7HEL053 kit)

7. Arbor scale

Figure 4-14. Balancer Installation - OH-13 and TH-I3 Helicopter Engine Fan Assembly.

4-22