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 TM 10-3930-621-34
then force the center cylinder ram of the cylinder cluster
10-11. Removal
from the cylinder, raising the inner mast and carriage.
a. Fully retract mast and unlock and remove
c. As the center cylinder ram reaches its farthest
carriage forks. Cylinders must be completely collapsed.
extent of travel the inner mast will be fully extended
b. Raise and block truck 24 inches from mast to
above the other two masts with carriage at the top.
floor.
Continued operation will cause the ram of the single
c. Remove screws (11 and 13, fig. 10-8), spacer
cylinder to force downward against the outer mast,
(9), and lock washers (10) from carriage supports.
raising the intermediate mast. Full extension of the ram
d. Remove carriage forks.
will raise the carriage to the highest level.
e. Remove connector (30, fig. 10-3), elbows (31
d. When the lift handle on the control valve is
and 35), flow regulator (33), and packings (59, 60 and
released to neutral, hydraulic oil pressure will hold the
63) from bottom of single lift cylinder (10). Discard
carriage at the required height. To lower the carriage,
packings.
push the handle forward. The hydraulic oil pressure will
f. Attach hoist to backrest frame (1, fig. 10-8) and
be released allowing the carriage and masts to lower to
disconnect chains from carriage.
the desired height. A flow regulator holds lowering
g. Remove backrest and carriage assembly
speed to a maximum of 40-80 fpm. The regulator is
through bottom of inner mast (20, fig. 10-3).
installed in the single lift cylinder hose connection at the
h. Disconnect tilt cylinders from outer mast (para
bottom of the outer mast.
e. Tilting action of the mast is controlled by
i. Using hoist. raise mast assemblies enough to
movement of the tilt handle on the control valve. The
remove weight on mast pivot pins (36, fig 10-3).
mast will tilt rearwards when tilt handle is pulled back and
Remove screws (64), lock washers (65), and mast pivot
forwards when pushed forward.
pins.
j. Using hoist, lift mast assemblies from truck and
KEY to fig. 10-3:
place them on suitable supports with cylinder cluster
1. Outer mast assembly
facing up.
2. Bearing
3. Stud
35.
Elbow
4. Shim(s), 0.015 inch
36.
Pin
5. Shim(s), 0.040 inch
37.
Pin
6. Bearing
38.
Screw
7. Intermediate mast assembly
39.
Nut
8. Stud
40.
Screw
9. Bracket
41.
Screw
10. Single lift cylinder
42.
Lock washer
11. Chain guard
43.
Screw
12. Cylinder cluster
44.
Lock washer
13. Chain anchor
45.
Nut
14. Chain connecting link
46.
Screw
15. Crosshead
47.
Lock washer
16. Pin
48.
Lock washer
17. Chain
49.
Nut
18. Washer
50.
Nut
19. Bearing
51.
Screw
20. Inner mast assembly
52.
Pin
21. Spacer
53.
Pin
22. Interlock
54.
Screw
23. Spring
55.
Screw
24. Adjusting screw
56.
Lock washer
25. Guard
57.
Screw
26. Elbow
58.
Lock washer
27. Tube
59.
Preformed packing
28. Clamp
60.
Preformed packing
29. Spacer
61.
Screw
30. Connector
62.
Lock washer
31. Elbow
63.
Preformed packing
32. Clamp
64.
Screw
33. Flow regulator
65.
Lock washer
Spacer
66.
Lubrication fitting
67.
Lubrication fitting
10-6
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