Assembly -706880633

TM 5-4210-233-14&P-1

4-200. AERIAL DISCHARGE VALVE PNEUMATIC ACTUATOR - Continued

d. Assembly.

(1) Coat actuator bore, pistons, pinion assembly and all new O-rings with grease (Item 17, Appendix

E).

(2) Press bottom bearing assembly (23, 25, 26) on to drive shaft (10). Bearing assembly should be

installed so that outer O-ring (25) is closer to the piston bore.

(3) Install retaining washer (22) and spring clip (21).

(4) Install bottom spacer (19).

(5) Install keys (20) on drive shaft (10).

(6) Insert drive shaft (10) into actuator body (24) from bottom. Install bottom pinion gear (18) and

upper pinion gear (17) as the drive shaft is inserted.

(7) Install top spacer (16).

(8) Install top bearing assembly (23, 25, 26). Bearing assembly should be installed so that outer O-

ring (25) is closer to the piston bore.

(9) Install retaining washer (15) and spring clip (14)

(10) Install center split spacer (13) between pinion gears (17 and 18).

(11) Install piston O-rings (12) onto pistons (11).

(12) Insert pistons (11) until rack engages pinion gears. At moment of engagement, drive shaft

should be positioned as shown. Rotate drive shaft in a clockwise direction until pistons bottom

out. In this position, the double "D" flats or the actuator bore keyway will be perpendicular to the

body axis.

(13) Install O-rings (9) in end caps (7).

(14) Install air passage O-rings (8) into the recess on the end face of the actuator body.

(15) Install end caps (7) and secure with washers (6) and socket head cap screws (5). Alternately

tighten screws (5) until secure.

(16) Install tapered adapter piece (3), position indicator (4), socket head capscrew (2), and indicator

arrow (1).

e. Installation.

(1) Install actuator (3) on valve and secure with four washers (5) and nuts (4).

(2) Connect two air lines (1 and 2) to actuator (3).

f. Follow-on Maintenance.

(1) Connect batteries (see para 4-114).

4-504