Disassembly - TM-10-3930-621-340153

TM 10-3930-621-34

(8) Remove screw (57), lock washer (58),

10-12. Disassembly

clamp (28), and spacer (29) securing bottom of single lift

cylinder (10) to intermediate mast (7).

a. Refer to figure 10-3 and disassemble as follows:

(9) Remove screw (43) and lock washer (42)

b. Remove inner mast (20) as follows:

attaching upper part of single lift cylinder (10) to bracket

(1) Remove screw (43) and lock washer (42)

(9), and screws (40 and 41) and nuts (39) attaching

connecting inner mast to center cylinder of cylinder

bracket to intermediate mast (7).

cluster (12).

(10) Remove bracket (9) from intermediate

(2) Remove bottom adjustment nuts (50) from

mast (7).

chain anchors (13) and remove chains (17) from cylinder

(11) Remove nut (49) and lock washer (48)

cluster (12) and inner mast (20). Match-mark location of

securing bottom of cylinder assembly (10) through

nuts (50) on anchors (13).

intermediate mast (7) to outer mast (1).

(3) Remove interlock spring (23) from screws

(12) Remove single lift cylinder (10) from

(24) and remove screws.

intermediate mast (7).

(4) Remove screw (54) and spacer (21) from

(13) Remove screws (38), studs (3), shims (4

interlock (22) and remove interlock from inner mast (20).

and 5), and bearings (6) at top of outer mast (1). Note

Tap out pin (53).

size and quantity of shims used.

(5) Using hoist, slowly raise inner mast (20)

(14) Using hoist, slide intermediate mast (7)

until notch at bottom of inner mast channel clears upper

from outer mast (1).

intermediate mast bearing(6).

(15) Remove bearings (6) and shims from

intermediate mast (7), if necessary.

Caution: Do not raise inner mast beyond

d. Remove lubrication fittings (66 and 67) and

clearance point or inner mast bearing (6) will

bearings (2) from outer mast (1).

contact upper intermediate mast bearing, which may

result in damage to the bearings.

10-13.

Cleaning, Inspection, Replacement and

(6) Check to see that the inner mast bearing

Repair

(6) will clear the notch in the upper intermediate mast

a. Clean all parts with cleaning compound, solvent

channel. If both bearings are clear, remove inner mast

(Spec. P-S-661).

(20) from intermediate mast (7) by carefully moving hoist

b. Inspect all parts for wear or damage.

in a horizontal direction.

c. If inner race of bearing is fractured, examine

(7) Remove bearings (6) and shims (4 and 5)

bearing stud for nicks. Replace bearing and stud if

from inner mast (20), if necessary.

damaged as follows: Note. All bearing studs (8, fig. 10-

c. Remove intermediate mast (7) as follows:

3) are welded into position except outer mast bearing

(1) Disconnect elbows (26) and tube (27) from

stud (3), which is attached to a screw 138i.

cylinder cluster and single lift cylinder.

(1) Press bearings (6, fig. 10-3) from studs

(2) Remove screws (46), lock washers (47),

(8) and remove shims (4 and 5). Note size and quantity

and chain guards (11) from crossheads (15).

of shims used.

(3) Remove small spring pins (52), bearing

(2) Remove filler metal from around stud

pins (16), washers (18), and bearings (19) from

using a pencil grinder. Do not make any passes into

crossheads.

mast channel. Remove stud from channel.

(4) Remove screws (51) and crossheads (15)

(3) Prepare welding surface by removing all

from cylinder cluster (12).

foreign material such as rust, scale, grease, etc. Any

(5) Remove nut (45) and lock washer (44)

part that may be damaged by heat should be removed

securing center cylinder of cylinder cluster to

before welding.

intermediate mast (7).

(4) Locate, tilt, and aline new stud on mast

(6) Using hoist, remove cylinder cluster (12)

channels (fig. 10-4). Use Section B-B of figure 10-4 for

from intermediate mast (7).

dimensions of inner mast bearing stud location. Sections

Caution: Always handle cylinder in fully

A-A and B-B of figure 10-4 apply to intermediate mast

collapsed position to avoid scratching or nicking

bearing stud locations.

ram surface.

(7) Remove spacer (34) and clamp (32) from

outer mast (1).

10-8