TM 5-4930-244-14
h.
Variable Speed Control.
(1)
Removal. (Refer to Figure 5-18).
(a)
Remove tension spring (1) from air cylinder support bracket (2) and from upper throttle bracket (3).
(b)
Remove cotter pin (4) from pin (5) holding throttle assembly (6) to upper throttle bracket (3).
(c)
Remove three capscrews (7), holding bracket (8) onto guard (9).
(2)
Disassembly.
(a)
Remove two nuts (10), and adjusting nut (11) from control rod (12). Slide sleeve (13) off of control
rod.
(b)
Remove nut (14) from control rod (12) on outside of upper throttle bracket (3).
(c)
Slide upper throttle bracket (3) from control rod (12). Remove nut (15) from control rod.
(d)
Slide control rod (12) out from plunger (16).
(e)
Remove bellows (17), adjuster (18) and sealing ring (19) from plunger (16). Slide speeder spring (20)
off of plunger.
(3)
Repair.
(a)
Inspect all parts for cracks, distortion and other damage. Replace parts as needed..
(b)
Replace sealing ring (19).
(4)
Installation.
(a)
Install control rod (12) into nut (15) and through upper throttle bracket (3) into nut (14).
(b)
Install control rod (12) through holding bracket (8), sleeve (13) into adjusting nut (11). Run adjusting
nut (11) upon control rod (12) until upper throttle bracket (3) and plunger (16) are in the correct
position. Adjust nuts (14 and 15) so that they are tight against upper throttle bracket (3).
(c)
Thread two nuts (10) onto end of control rod (12). Tighten until they are firmly against adjusting nut
(11)
(d)
Slide bellows (17), adjuster (18) and sealing ring (19) onto plunger (16) until control rod (12) can be
installed into hole in plunger (16). Slide speeder spring (20) onto plunger (16). Install adjuster (18)
into side of engine casing (21).
(e)
Install three capscrews (7) and holding bracket (8) onto guard (9).
(f)
Install fork of throttle assembly (6) to upper throttle bracket (3). Insert pin (5) through fork of throttle
assembly and upper throttle bracket. Install cotter pin (4) through pin (5). Spread cotter pin apart and
snug it up to end of pin.
(g)
Install tension spring (1) to air cylinder support bracket (2) and upper throttle bracket (3).
5-48
