a. Remove nut (1), washer (2), and bolt (3)
a. Place new O-ring (39) on flow control screw
holding lever (4) to shaft of ball (38). Remove lever,
(40). Grease O-ring and insert flow control screw into
noting its position relative to ball position in valve for aid
body (41). For bypass valve tighten flow control screw
down tight against seat. For control valve, tighten flow
b. Remove four bolts (5) and washers (6).
control screw down against seat, and then back off about
Remove fitting (7) from bypass valve, or fitting and flange
b. Assemble new bearing (28) in cap (29). Attach
(8 and 9) from control valve.
c. Remove gasket (10) and seat (12) from body
gasket (30) and cap (29) to body (41). Secure with four
washers (27) and bolts (26). Refer to figure 8-1 for
(41); remove O-rings (11) from seat.
d. Remove four bolts (13) and washers (14).
proper location of parts.
c. Install ball (38) with short shaft into bearing
Remove fitting (15) from bypass valve, or fitting (16) from
(28) in cap (29) installed in body (41) in step b,
e. Remove gasket (17) and seat (19) from body
d. Place thrust washer (37) over long shaft of ball
(41); remove O-rings (18) from seat.
Remove four bolts (20) and washers (21), and
e. Install quad rings (36) and bearing (33) into
remove cap (22), gasket (23), and seat (25) from body
(41). Remove O-rings (24) from seat.
shaft end cap (34).
g. Remove four bolts (26) and washers (27), and
Grease quad rings and long end of shaft on
remove can (29) and gasket (30) from body (41); remove
g. Attach gasket (35) and shaft end cap (34) to
bearing (28) from cap.
h. Remove four bolts (31) and washers (32), and
body (41) over long shaft of ball (38). Secure with four
remove shaft end cap (34) and gasket (35) from body
washers (32) and bolts (31). Check ball for freedom of
(41). Remove bearing (33) and quad rings (36) from
h. Place one each new O-ring (24, 18, and 11) in
shaft end cap.
Remove ball (38) from body (41); remove
groove closest to concave sealing surface of three new
thrust washer (37) from shaft of ball.
seats (25, 19, and 12). Grease O-rings and slide seats
Remove flow control screw (40) from body
into the three ports of body (41).
Place one each new O-ring (24, 18, and 11) in
(41); remove O-rings (39) from flow control screw.
k. Discard all kitted Darts (noted on key to fig. 8-
exposed groove of seats (25, 19, and 12).
To reassemble bypass valve, place new
1). These parts shall be replaced by new parts from the
overhaul kit at assembly.
gaskets (23, 17, and 10) under cap (22) and fittings (15
and 7). Refer to figure 8-1 for proper locations of parts.
Secure parts to body (41) using four washers (21, 14,
8-4. Cleaning, Inspection, and Repair
and 6) and bolts (20, 13, and 5) at each location.
k. To reassemble control valve, place new
Thoroughly clean and inspect all reusable parts of the
gaskets (23, 17, and 10) under cap (22), fittings (16), and
valve as follows:
flange (9). Slip flange (9) over fitting (8). Refer to figure
a. Inspect all metal parts for nicks, scratches,
8-1 for proper locations
of these parts. Secure parts
cracks, or other damage. Polish out minor defects using
body (41) using four washers (21, 14, and 6) and bolts
crocus cloth, Federal Specification P-C-458 for steel
(20, 13, and 5) at each location.
parts and aluminum oxide abrasive cloth, Federal
Specification P-C-451 for aluminum parts.
Bolts (5) securing flange (9) and elbow
b. Inspect all threaded parts for crossed or
fitting (8) may be left slightly loose.
otherwise damaged threads.
Fitting is rotated on final assembly to
c. Inspect surfaces of ball (38) for condition.
insecticide sprayer and is secured when
proper location is determined.
Place lever (4) over exposed end of long shaft
of ball (38).
Secure in same position noted on
Reassemble the valve in accordance with the following
disassembly with bolt (3), washer (2), and nut (1).
steps, using new parts from overhaul kit for those parts
m. Check valve for freedom of movement.
valve (52, fig. 4-9) and control valve assembly (47) is
identical except where noted.