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 TM 10-3930-638-24&P
3-31. MAST ASSEMBLY MAINTENANCE (cont)
c. Inner and Outer Mast (cont).
REMARKS
ACTION
ITEM
LOCATION
STEP
INSPECTION/REPAIR
Inspect
Replace or repair by welding if cracked,
Inner mast (3) outer
5
broken, or structurally damaged. Replace
mast (12), and hose
channels (16, 17, and 18)
if twisted or bent out of shape and if
roller bearing posts are out of round or
worn
Replace if out of round (inside and outside
Inspect
Roller bearings (4 and
6
diameters), worn, or damaged
1 o)
Replace if bent
Inspect
7
Roll pins (6 and 19)
Spring retainer 7) and
Replace if damaged, bent or worn
Inspect
8
lock pin (9)
Replace if damaged, distorted, or perma-
Inspect
Spring (8)
9
nent set is noticed
Replace if damaged, worn, or threads
Inspect
All other parts
10
damaged
INSTALLATION/REPLACEMENT
Install
On roller bearing posts
a. Three roll pins (19)
11
Outer mast
(12)
Position
b. Three hose channels
(18, 17 and 16)
Install
c. Three cap screws
(15), six washers
(14) and three
nuts (13)
Position
d. Shims (11)
Position
e. Two roller bearings
(10)
Position
12
Inner mast (3)
a.
Lock pin (9)
Position
b.
Spring (8)
Position
c.
Spring retainer (7)
Install
d.
Roll pin (6)
Install
On roller bearing posts
e.
Shims (5)
f.
Install
Two roller bear-
ings (4)
To approximate center of inner mast
Attach
g. Chain hoist
3-262
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