Hoist Cylinders

TM 10-3930-631-34

KEY to fig 7-9.

number of turns as when removed. Install screw (4),

1. Screw

12. Packing

lock washer (5) and nut (6) and tighten to secure yoke to

2. Nut

13. Backup ring

plunger rod.

3. Shaft

14. Packing

(7) Install lubrication fitting (8) in tube.

e. Installation.

Refer to TM10-3930-631-12 to

4. Screw

15. Spacer

5. Lock washer

16. Packing

install and adjust tilt cylinders.

6. Nut

17. Piston packing

7-7. Hoist Cylinders

7. Yoke

18. Bearing

a. Removal of Cluster Cylinder.

8. Lubrication fitting

19. Retaining ring

(1) Refer to paragraph 2-14 and remove the

9. Packing gland

20. Plunger rod

side shift carriage from the mast.

10. Nylon pellet

21. Tube

(2) Loosen lock nut (fig. 7-10) and remove

11. Wiper ring

adjusting nut. Remove chain anchors (23) and chain

(3) Remove packing gland (9). Remove nylon

guards (19, fig. 7-11).

pellets (101. Remove backup ring (13) and packing (14)

from outer circumference of packing gland.

(4) Inspect and remove rod wiper (11) and

internal packing (12) from packing gland.

(5) Remove plunger rod (20) from tube.

Remove bearing (18) and packing (17) from plunger rod

(20).

c. Cleaning, Inspection and Repair.

(1) Clean metal parts in cleaning compound,

solvent (Fed. Spec. P-D-680) and dry thoroughly.

(2) Check sliding surfaces of rod and tube.

Surfaces must be smooth and polished. If' surfaces are

nicked or damaged replace parts.

(3) Inspect threads on rod and yoke. Replace

parts if threads are damaged.

(4) Replace nylon pellet and all backup rings

and packing with parts in cylinder repair kit.

d. Assembly.

(1) Install new packing (17, fig.

7-9) and

Figure 7-10. Lift chains.

bearing on plunger rod (20).

(2) Install new packing (16) in spacer (15) and

install spacer on plunger rod.

(3) Remove lift chains from crossheads on

(3) Install plunger rod in tube. Install new nylon

cylinders. Disconnect tube (4, fig. 7-11) from between

pellets (10), packing (14) and backup ring (13) in

cluster cylinder and single cylinder. Remove fittings (5).

grooves on outer circumference of packing gland (9).

(4) Attach a suitable hoist to cluster cylinder and

(4) Position packing (12) and wiper ring (11) in

support cylinder while removing attaching parts.

grooves in inner circumference of packing gland.

(5) Remove screw (33, fig. 7-11) and lock

(5) Install gland nut over plunger rod and thread into

washer (34) from inner mast and cluster cylinder.

tube. Gland nut must be flush with outer edge of cylinder

tube.

(6) Install yoke (7) on plunger rod same

7-15