LIFT CHAIN ADJUSTMENT

TM 10-3930-644-14&P

TRI-MAX MAST

(CLUSTER

CYLINDER)

F. LIFT CHAIN ADJUSTMENT

REASSEMBLY

When it becomes apparent that the fork carriage is not

1. Carefully insert too inner mast section within the

level, that the lift chains are loose, or that the forks are

intermediate mast section.

higher than 1/4" to 1/2" above the floor when the lift

cylinder is fully lowered, then the lift chains require

adjustment.

NOTE

Ensure that all roller bearings have

Although the chain anchors are of different sizes and in

been replaced, and are shimmed if

different locations on the various types of masts, the lift

necessary.

chain adjustment remains the same, with the following

2. Carefully insert the inner/intermediate mast

exception:

sections within the outer mast section; this is

accomplished by reversing the removal

NOTE

procedure, that is, by inserting mast sections at

ALL CLUSTER CYLINDERS are

the top of the outer mast.

adjusted with the PRIMARY Cylinder

FULLY extended.

3. Replace the channel restraint interlock

assembly. Replace the cylinder bracket at the

1. Position the mast assembly so it is vertical.

intermediate mast top support.

Ensure that the inner mast section and lift

cylinder are in the fully lowered position.

4. Install the cluster cylinder assembly and the

intermediate cylinder assembly (refer to TRI-

2. Loosen the chain anchor locknuts.

MAX CYLINDER CLUSTER INSTALLATION for

specific instructions).

3. Chain tension is adjusted by increasing or

decreasing the chain lengths with the adjusting

5. Replace the bearings and studs previously

nuts. Alternately tighten or loosen the chain on

removed from the top of the outer mast.

one side and then on the opposite side, until the

chains are snug, with no slack, and carriage

E. INSTALLATION

forks clear the floor within 1/4" to 1/2".

1. Using a properly rated hoist, maneuver the mast

NOTE

assembly into its relative mounting position on

Two (2) sets of chains are used in

front of the lift truck.

TRI-LIFT (and some TRI-MAX) masts,

and chain tension is adjusted with

2. Carefully Insert the mast pivot pins by reversing

adjusting nuts and turnbuckles.

the REMOVAL procedure.

Adjust primary chain anchors first

until forks barely clear the floor.

3. Connect and properly secure the tilt cylinders.

Then adjust the secondary chain

anchors until chains are snug.

4. Replace hydraulic line(s,).

4. Make certain that the lift chain tension is equal

5. Refer to CARRIAGE ASSEMBLY, Topic 3, and

on each chain and that the fork carriage is level.

install carriage.

6. If applicable, replace capscrews and spacer at

carriage roller supports.

7. Replace carriage forks.

(Refer to FORK

INSTALLATION, Topic 4.)

3-191