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TM 10-3930-638-24&P
3-31 MAST ASSEMBLY MAINTENANCE (cont)
b. Side Shifter Frame and Rotation Bearing.
This task covers:
a. Removal
b. Cleaning
PERSONNEL REQUIRED
Two maintenance technicians
INITIAL SETUP
TOOLS
Chain Hoist, 1/2 ton capacity
Automotive Mechanic’s Tool Kit
NSN 5180-00-754-0641
Tap, 5/8-11 UNC 2B
Steel Horses (2)
MATERIALS/PARTS
Cleaning solvent P-D-680
Clean cloths
c. Inspection/Repair
d. Installation/Replacement
EQUIPMENT CONDITION
Paragraph
Condition Description
Fork assembly grounded; mast
assembly in vertical position.
2-56f(1)
Hoses, lines, and fittings
between control valve and
mast assembly, disconnected
at mast assembly and lift
cylinder assembly.
2-47
Front axle tires and wheels removed
3-31a
Carriage assembly removed.
STEP
LOCATION
ITEM
ACTION
REMARKS
REMOVAL
1
Inner mast
Chain hoist
Attach
To top of inner mast; take up all slack
WARNING
Before performing following steps, be sure mast assembly is se-
curely supported by chain hoist. Failure to do so will cause mast
assembly to pivot forward on pivot mast pin which could result
in bodily injury.
2
Mast assembly,
a. Four retaining rings (1) Remove
sides
b. Two pins (2)
Remove
c. Tilt cylinder as-
Reposition out of
semblies
way
d. Two nuts (3)
Loosen
e. Two lower pivot
Tap to loosen
Use ten pound hammer
mast pins (5)
f. Two nuts (3)
Remove
g. Two washers (4)
Remove
h. Two lower pivot mast
Remove
pins (5)
i. Two washers (6)
Remove
j. Two lubrication
Remove
fittings (7)
Change 1
3-251
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