Disassembly

1 Pry open links on ends of single chain assembly (1) and remove single chain assembly. Remove quick release pin (2) from yoke (3).

Screw Gun Injuries

2 Remove two self-locking nuts (4 and 5). Discard two self-locking nuts.

Self Locking Knob AssemblyScrew Gun InjuriesM122 Tripod

3 Remove traversing handwheel (6) as a unit.

WARNING

To avoid injury to your eyes, use care when removing and installing spring-loaded parts.

4 Separate union nut (7), scale dial (8), headless straight pin (9), helical compression spring (10), and knob

5 Remove woodruff key (12) and flat washer (13) from traversing screw (14). Push traversing click ring (15) from yoke (3) and remove traversing screw (14) from yoke.

Disassembly Automatic ShotgunsLocking Quick Release Nut

6 Pull out slightly on flat spring (16) and remove elevating screw assembly (17) from elevating mechanism sleeve (18).

7 Using spanner wrench (item 3, appx B), remove automatic gun stop (19) from end of lower elevation screw

DISASSEMBLY (cont)

8 Remove upper elevation screw (21) with designation plate (22) attached.

9 If damaged, remove designation plate (22).

Machine Screw Designation

Remove externally threaded ring (23) from lower elevation screw (20).

Machine Screw Designation

11 Remove setscrew (24) and lower elevation screw (20) from knob (25).

Spring Loaded Sleeve Gun

12 Smooth stake marks on elevating click ring (26) and remove. Remove dial pointer (27) from knob (25).

Spanner Wrench Yoke Driveshaft

WARNING

WARNING

To avoid injury to your eyes, use care when removing and installing spring-loaded parts.

Remove headless straight pin (28) and compression helical spring (29) through the center hole of knob (25).

14 If damaged, drill out plain solid disk (30).

Spring Loaded Sleeve Gun

15 Drive out and discard spring pin (31).

16 Smooth staked metal on flat spring (16) and remove from elevating mechanism sleeve (18).

Spring Loaded Sleeve Gun

DISASSEMBLY (cont)

To avoid injury to your eyes, use care when removing and installing spring-loaded parts.

17 Remove machine screw (32) and lockwasher (33) from remote control lever (34). Discard lockwasher. Remove remote control lever, helical torsion spring (35), and self-locking screw (36) from elevating mechanism sleeve (18). Discard self-locking screw.

INSPECTION/REPAIR

1 Inspect for broken, damaged, or missing parts.

2 If yoke is broken or damaged, repair is by replacement of next higher assembly.

3 Repair is by replacement of authorized parts (appx C).

M122 Tripod

REASSEMBLY

1 Install new self-locking screw (1) on elevating mechanism sleeve (2).

NOTE

Self-locking screw will need to be adjusted when remote control lever is installed. Remote control lever must be aligned with traversing bar assembly.

Install helical torsion spring (3) and remote control lever (4) on self-locking screw (1) and secure with new lockwasher (5) and machine screw (6).

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3 Install flat spring (7) and stake in four places near the bottom. Install new spring pin (8) and stake material of elevating mechanism sleeve (2) over spring pin on both ends.

NOTE

If plain solid disk was removed, perform steps 4 and 5. If plain solid disk was not removed, go to step 6.

4 Drill out any portion of plain solid disk remaining in hole of knob (9) using a 0.125 (1/8) in. twist drill.

5 Install headless straight pin (10), helical compression spring (11), and plain solid disk (12) in side of knob (9). Disk is to be flush to 0.010 in. (0.025 cm) below outer diameter of knob (9). Stake rim of hole in three places.

M122 TripodM122 Tripod

6 Install helical compression spring (11) and headless straight pin (10) through center hole of knob (9).

7 Apply pressure to end of headless straight pin (10) and hold it while inserting elevating click ring (13). Make sure key of elevating click ring is aligned with 0 graduation mark on knob (9).

REASSEMBLY (cont)

M122 Tripod

8 Position lower elevation screw (14) under elevating click ring (13) and rest it on a flat surface. Install dial pointer (15) on elevating click ring. Make sure dial pointer aligns within 0.030 in. (0.076 cm) of 0 graduation. Stake in three places 120 ± 5 degrees apart.

9 If removed, install designation plate (16). Position as far as possible toward upper end of groove. Stake on both sides at top, middle, and bottom of designation plate (six locations total) in the base of thread area to prevent thread damage.

10 Slide knob (9) on upper elevation screw (17) until top of dial pointer (15) is aligned with 0 graduation on designation plate (16). Screw lower elevation screw (14) on upper elevation screw (17) until fully seated in knob (9). Recheck graduation alignment to make sure it is correct.

11 Install externally threaded ring (18) on knob (9) Tighten externally threaded ring until flush with bottom of knob and stake in two places.

M1919a4 Bottom Plate Screw Staking

NOTE

If threaded hole in knob does not align with original hole in flange of lower elevation screw, perform step 12. If holes are aligned, go to step 13.

12 Drill flange hole in lower elevation screw (14) to a depth of 0.30 in. (0.76 cm) using a 0.078 (5/64) in. twist drill.

13 Recheck to make sure graduation alignment has been maintained. Install and tighten setscrew (19).

14 Screw upper elevation screw (17) in lower elevation screw (14).

15 Using spanner wrench (item 3, appx B), install automatic gun stop (20) until flush and stake in two places 180 degrees apart.

Screw Stakes

16 Pull back slightly on flat spring (7) and screw elevating screw (21) in elevating mechanism sleeve (2).

REASSEMBLY (cont)

17 Install yoke (22), traversing click ring (23), traversing screw (24), and flat washer (25).

Helical Gun Magazine

18 Assemble union nut (26), scale dial (27), headless straight pin (28), helical compression spring (29), and knob (30) to make traversing hand-wheel (31).

Exploded View Scale ModelM60 Machine Gun Disassembly

19 Install woodruff key (32) and traversing handwheel (31), and secure with two new self-locking nuts (33 and 34). Traversing handwheel should move freely with no more than 1/16 of a turn backlash.

20 Install quick release pin (35) in yoke (22). Crimp links on ends of single chain assembly (36) to yoke (22) and quick release pin (35).

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