UH-1C, UH-1E, UH-1L, UH-1M, AH-1J, TH-1L, TH-1G, and AH-1G Main Rotor Hub Assembly (540 Series Hub) Balance Check (cont)

TM 55-4920-201-14

work stand and adjacent objects, and note balance

i. Install spacer (13) over lower end of arbor;

condition indicated at top end of arbor.

install handwheel (14) in lower end of arbor and

tighten to clamp both legs of yoke firmly against

NOTE

top surfaces of hub yoke.

In order to insure that hand wheel (14,

figure 4-20) suspends free of interference

j. Using gage (10) as shown, adjust rotor hub

within the inside diameter of the stand

drag struts to symmetrical angular positons using

table, it may be necessary to adjust the level

gage outer position (12). Remove gage from rotor

of the stand assembly by installing suitable

hub during subsequent balance check.

blocks under the two tubular stand legs.

k. Install quick-disconnect assembly with

NOTE

3/16-inch cable (7A050 kit) on arbor suspension

For balance tolerance and application of

rod and hoist balancing assembly approximately

inch off work stand. Check to insure that

balance corrections, refer to applicable

suspended assembly is free from interference with

helicopter manual.

4-32