Assembly - TM-10-3930-621-340156

TM 10-3930-621-34

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

(3) Lower inner mast (20) slightly into

into outer mast (1).

intermediate mast (7).

Check clearance between

(3) Using same size and quantity of shims

intermediate mast upper bearings and inner mast

used when removed, install studs (3), shims (4 and 5),

channel and inner mast bearings (6), and intermediate

and bearings (6) at top of outer mast. Secure studs to

mast channel. Clearance should not be more than 0.015

mast with screws (38).

of an inch.

(4) Check clearance between outer mast

(4) If clearance is more than 0.015 of an inch,

bearings (6) and mating intermediate mast channels and

install additional shims (4 or 5). See operation c (4)

intermediate mast lower bearings (6) and mating outer

note.

mast channels. Clearance should be no more than

(5) When proper shimming is completed,

0.015 of an inch.

install bearings (6) and slide inner mast completely into

(5) If clearance is more than 0.015 of an inch,

intermediate mast.

remove bearing assembly and install additional shims (4

(6) Install pin (53) into middle hole on inner

or 5).

mast (20) and secure interlock (22) in upper hole with

Note. Divide shims as equally as possible

spacer (21) and screw (54).

between bearings. Shims are available in 0.015 and

(7) Install both screws (24) and connect

0.040 inch thicknesses.

interlock spring (23) to them.

(6) When proper shimming is completed,

(8) Attach chains (17) to cylinder cluster (12)

install bearings on outer mast (1) and torque screws (38)

with adjustment nuts (50) and anchors (13), noting

to 245 foot-pounds.

match-mark nut locations on screws. Final adjustment

(7) Secure bracket (9) to intermediate mast

of chains to be made after carriage is installed.

(7) with screws (40 and 41) and nuts (39).

(9) Secure cylinder cluster (12) to inner mast

(8) Install single lift cylinder (10) on

with lock washer (42) and screw (43) attached to center

intermediate mast (7) and secure to top bracket with lock

cylinder of cluster.

washer (42) and screw (43); and to bottom of mast with

10-15. Installation

spacer (29), clamp (28), lock washer (58), and screw

a. Using hoist, install mast assembly on truck and

(57).

insert pivot pin (36, fig. 10-3). Secure pins with lock

(9) Attach clamp (32) to bottom of outer mast

washer (65) and screw (64).

with spacer (34).

b. Connect hydraulic line to flow regulator.

(10) Install new packings (59, 60 and 63), flow

c. Connect tilt cylinders to outer mast (para 108).

regulator (33), elbows (31 and 35), and connector (30)

d. Using hoist, slide backrest and carriage

on bottom of single lift cylinder (10).

assembly up inner mast and secure to chains with chain

(11) Using hoist, install cylinder cluster (12) on

anchors. Before releasing hoist, check that chains are

intermediate mast (7).

secure at cylinder cluster and running evenly, with no

(12) Secure center cylinder of cylinder cluster

twists, through the crosshead bearings.

to bottom of intermediate mast with lock washer (44) and

e. Remove hoist from carriage and install screws

nuts (45).

(11 and 13, fig. 10-8), spacer (9), and lock washers (10)

(13) Attach crossheads (15) to outer cylinders

in carriage roller supports.

of cylinder cluster with screws (51).

f. Remove blocks and lower truck to floor.

(14) Install bearings (19), washers (18), and

g. Install carriage forks making sure fork is locked

pins (16) in crossheads and secure with spring pins (52).

in position.

(15) Install chain guards (11 on crossheads

h. Check for complete lubrication of mast assembly

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

per TM 10-3930-621-12.

(16) Connect elbows (26) and tube (27) from

i. Check lift for proper operation as follows: (1)

cylinder cluster (12) to single lift cylinder (10).

Lower carriage to lowest point of travel. Bottom of

d. Assemble inner mast (20)

as follows: (1)

carriage lower bar should be adjusted from 2-3/4 to 31/4

Install bearings (6) and same size and quantity of shims

inches from floor. Refer to TM 103930-621-12 for

(4 and 5) on inner mast welded bearing stud (8), if

adjustment of chains.

bearings and shims are removed during disassembly.

(2) Using extreme care, very slowly extend

(2) Using hoist, install inner mast (20) on

mast to full lift checking all moving parts for binding,

intermediate mast (7) being careful that bearings (6)

interference, or excessive looseness or play.

clear

notches.

10-11