Section V. SINGLE CYLINDER ASSEMBLY

TM 10-3930-621-34

b. Install bearings (19), washers (18), and bearing

10-19. Cleaning, Inspection, and Replacement

pins (16) in crossheads (15) and secure assemblies to

a. Clean all metal parts with cleaning compound,

crossheads by tapping pins (52) into bearing pins.

solvent (Spec. P-S-661). Dry thoroughly with dry,

c. Install chain guards (11) on crossheads, with rods

compressed air.

through holes in cylinder brackets. Secure guards to

b. Inspect parts for wear or damage. See

crossheads with screws (46) and lock washers (47).

paragraph 1-4 for wear allowances. Remove nicks and

d. Using a hoist, carefully install cylinder cluster (12)

scratches with fine emery paper.

on intermediate mast and secure at bottom with nut (45)

c. Replace all packing, wiper rings, and backup

and lock washer (44).

rings regardless of condition.

Replace all other

e. Attach chains (17) to chain anchors (13) and

unserviceable parts as authorized.

install anchors and nuts (50), noting match-mark of

10-20. Assembly

previous adjustment.

a. Refer to figure 10-6 and assemble as follows:

f. Run chains evenly around bearings (19), allowing

Note. Assembly applies to both other and center

them to hang free.

cylinder assemblies unless otherwise specified.

g. Connect tube assembly (27) to center cylinder at

b. Loosely install bleeder screws (10) in tubes {121.

elbow (26).

c. Install wear blocks (2) on rams (1 and 11) and

h. Using hoist, raise carriage into inner mast (20)

carefully slide rams into tubes (12).

and attach chains to chain anchors.

d. Insert spring pin (14) in center ram (1).

i. Lower inner mast and install screws and spacer

e. Install stop ring (9), new packing (8), and backup

on carriage roller supports and carriage forks. Install and

ring (7) on ram (1 and 11).

lock forks in position.

f. Install new wiper ring (3) and packing (4) in gland

j. Using chain anchors (13) and nuts (50) adjust

nut (6). Install spacer (13), if center cylinder is being

carriage to 23/4 to 34 inches from floor (TM 10-3930-

assembled.

621-12). Adjust both anchors to equal chain tension.

g. Using new locking pellets (5), secure gland nut

k. Check to see if bleeder screws are loose.

(6) to tube (12) with spanner wrench.

Operate control valve to actuate cylinders and slowly

10-21. Installation

raise and lower mast. When clear, bubble free oil flow

To install the cylinder cluster without installing the inner

from bleeder screw hole is obtained, tighten bleeder

mast, refer to figure 10-3 and proceed as follow s:

screws.

a. Install crossheads (15) on top of cylinder cluster

and secure with screws (51).

Section V. SINGLE CYLINDER ASSEMBLY

10-22. Description

Caution: When disassembling or reassembling

The single cylinder assembly is installed on the inner

cylinders, use extreme care to avoid damaging the

portion of the intermediate mast, with the cylinder ram

ram surface finish.

extending through an opening in the intermediate mast

a. Remove cylinder cluster (para 10-17).

and anchoring at the lower part of the outer mast. The

b. Refer to figure 10-3 and continue removal as

upper portion of the cylinder is secured in a bracket and

follows:

the lower portion by a clamp. Forcing the single cylinder

c. Remove lock washer (58), screw (57), clamp

ram downward against the outer mast will raise the

(28), and spacer (29) securing cylinder (10) to

intermediate mast. Full extension of the ram will raise

intermediate mast (7).

the carriage to its highest level.

d. Remove screw (43) and lock washer (42)

10-23. Removal

attaching cylinder to bracket (9) at top of intermediate

To remove the single cylinder assembly without

mast.

removing the inner mast, proceed as follows:

e. Remove nut (49) and lock washer (48)

securing cylinder to bottom of outer mast (1).

10-14