I 5 Install compression helical spring (30) and headless straight pin (31) through center hole of knob (25).
6 Apply pressure to end of headless straight pin (31) and hold it while inserting handwheel click ring (28). Make sure key of handwheel click ring is aligned with 0 graduation mark on knob (25).
7 Position lower elevating screw (23) under handwheel click ring (25) and rest it on a flat surface. Install dial pointer (27) on handwheel click ring. Make sure dial pointer aligns within 0.030 in. (0.076 cm) of 0 graduation. Stake in four places, 90 degrees ± 5 degrees apart.
8 If removed, install scale plate (20). Position as far as possible toward upper end of groove. Stake on both sides at top, middle, and bottom of scale plate (six locations total) in the base of thread area to prevent thread damage.
9 Slide knob (25) on upper elevating screw (21) until top of dial pointer (27) is aligned with 0 graduation on scale plate (20). Screw lower elevating screw (23) on upper elevating screw (21) until fully seated in knob (25). Recheck graduation alignment to make sure it is correct.
10 Install externally threaded ring (24) on knob (25). Tighten externally threaded ring until flush with bottom of knob and stake in two places.
If threaded hole in knob does not align with original hole in flange of lower elevation screw, perform step 11. If holes are aligned, go to step 12.
11 Drill flange hole in lower elevation screw (23) to a depth of 0.30 in. (0.76 cm) using a 0.078 (5/64) in. twist drill.
12 Recheck to make sure graduation alignment has been maintained. Install and tighten setscrew (22).
13 Screw upper elevating screw (21) in lower elevating screw (23).
14 Using spanner wrench (item 3, appx B) install automatic gun stop (19) until flush and stake in two places 180 degrees apart.
15 Pull back slightly on elevating stop assembly (18) and screw elevating screw assembly (16) in elevating mechanism sleeve (17).
16 Install yoke (12), traversing mechanism ring (13), traversing screw (15), and flat washer (10).
17 Assemble union nut (4), scale dial (7), headless straight pin (10), compression helical spring (9), and knob (4) to make traversing handwheel.
18 Install woodruff key (14) and traversing handwheel (4), and secure with two new self-locking nut (1). Traversing handwheel should move freely with no more than 1/16 of a turn backlash.
19 Install headless grooved pin (16) and two retaining rings (15) on traversing and elevating mechanism.
THIS TASK COVERS:
a. Disassembly b. Inspection/Repair
Tools and Special Tools
Small Arms Shop Set (item 1, appx B)
Solid rivet (11010448)
6-5 Pintle lock assembly removed
To avoid injury to your eyes, use care when removing and installing spring-loaded parts.
To avoid injury to your eyes, wear safety glasses when grinding parts.
1 Grind head off solid rivet (1). Remove solid rivet and pintle lock release cam (2). Discard solid rivet.
2 Remove shaft collar (3) from body (4).
3 Remove housing (5) and two helical springs (6) from body (4).
1 Inspect for broken, damaged, or missing parts.
2 If shaft collar, body, or housing are broken or damaged, repair is by replacement of next higher assembly.
3 Repair is by replacement of authorized parts (appx C). REASSEMBLY
1 Install two helical springs (6) in body (4). Install body in housing (5) so that post sticks out through U-shaped opening of housing.
3 Position pintle lock release cam (2) over body (4) and secure with new solid rivet (1). Pintle lock release cam should pivot freely after riveting. Peen over end of rivet.
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