DUAL MAST ASSEMBLY.

(4) Disconnect hose at cylinder adapter (24,

b. Installation. Reverse procedure of a. above,

figure 7-25).

and purge air from hydraulic system.

6-78.

HOIST ASSEMBLY (Triple Mast Assembly

(5)

Disconnect headlight at uprights (para 6-

Truck)

45).

a. Removal.

(6)

Disconnect tilt cylinders at uprights (para

(1) Fully lower upright assembly.

6-66).

(2)

Remove load backrest from carriage

(7) Remove bearing caps holding mast to

(para 63 1).

axle, each attached with two screws and lockwashers.

Hoist mast from truck and lay on floor for disassembly.

(3)

Remove chain assembly (para 63-3f.)

Replacement. Reverse procedure in a. above.

(4) Disconnect hose at adapter (24, figure 7-

25) from base of cylinder.

6-81.

CONTROL VALVE.

Removal.

(5) Remove screw (46) and spacer (47) from

(1) Disconnect control

valve

linkage

top to cylinder.

control valve (para 6-65).

(6)

Slide hoist cylinder from uprights.

(2) Tag hoses for identification and

disconnect from control valve (40, figure 7-20). Cap or

b. Installation. Reverse procedure of a. above,

plug hose ends and valve ports to prevent entrance of

and purge air from hydraulic system.

dirt.

6-79.

DUAL MAST ASSEMBLY.

(3) Remove three screws (41), nuts (42), and

a. Removal. Removal of the complete mast is

lockwashers (43) securing control ;valve (40) to truck

Required when removing the drive axle. In most cases

body and remove control valve. Screws are removed

the mast can be maintained by removal arid

from battery compartment side.

replacement of Its individual components. Remove

complete mast as follows:

Installation.

(1) Slide backrest from carriage and lift from

(1) Install three control valve mounting

truck (para 6-31).

screws through truck body from battery compartment

(2) Remove forks from truck (para 6-32).

side and mount control valve on screws. Secure with

(3) Attach a hoist to assembly and relieve the

removed nuts and lockwashers.

weight of the assembly on its supporting parts. Arrange

(2) Reinstall removed hoses according to

to brace the mast against tipping as disconnections are

tags attached at removal. Be certain hoses are tight.

made.

(3) Attach control valve linkage to control

(4) Disconnect hose at hoist cylinder fitting (7,

valve (para 6-65).

figure 7-23) and plug hose to prevent entrance or dirt.

(4) Operate system while gradually increasing

(5) Disconnect headlight at uprights (para 6-

loads to check for proper operation and hydraulic fluid

45).

leakage.

(6) Disconnect both tilt cylinders at uprights

by removing pivot pins and attaching screws (para 6-

6-82.

HYDRAULIC OIL TANK.

66).

Removal.

(7) Remove bearing caps holding mast to

(1) Drain hydraulic oil tank through plug (6,

axle each attached with two screws and lockwashers.

figure 7-18).

Hoist mast from truck and lay it on floor for disassembly.

(2)

Remove valve cover (para 6-30).

Installation. Reverse procedure in paragraph

above.

(3)

Remove seat (para 6-24).

6-80.

TRIPLE MAST ASSEMBLY.

(4)

Remove floor plate (para 6-27).

Removal.

(1) Slide backrest from carriage and lift from

(5) Loosen hose clamp (14, figure 7-13) and

truck (para 6-30).

disconnect hoses (13) at hydraulic tank.

(2) Remove forks from truck (para 6-32).

(3)

Attach a hoist to assembly to relieve

weight.

6-25