TM 5-3820-241-34
Legend for Fig. 5-16:
1 Lubrication fitting
6 Pivot shaft
2 Lubrication fitting
7 Pivot pin
3 Pivot pin
8 RH boom
4 Spring pin
9 Support pivot
5 Spring pin
10 Universal joint
5-22. Boom Pivot Mechanism Cleaning, In-
spection and Repair
a. Cleaning. Clean all parts with cleaning
solvent (FED SPEC PD 680) and dry thoroughly.
b. Inspection and Repair.
(1) Inspect the boom, boom supports joints,
arms and links for cracks breaks or other damage.
(2) Inspect bushings at the pivot points for
excessive wear.
(3) Inspect the
hardware for damaged
threads.
(4) Repair by replacement of defective parts.
5-23. Boom Pivot Mechanism, Reassembly and
Installation
(1) Reassemble the boom components in the
reverse of numerical sequence as illustrated in
figure 5-16.
(2) Reassemble the boom tilt and swing
mechanism in the reverse of numerical sequence
as illustrated in figure 5-15.
b. Installation.
(1) Install the tilt and swing boom assembly
(para 2-12).
(2) Install the feed extension cylinder (para
3-15).
(3) Install the boom swing cylinder (para 3-
13).
(4) Install the feed swing cylinder (para 3-
10).
(5) Install the boom lift cylinder (para 3-7).
(7) Refer to TM 5-3820-241-12 and install the
rock drill feed assembly.
(8) Refer to LO 5-3820-241-12 and lubricate
the rock drill.
a. Reassembly.
5-25
