TRI-MAX AND HIGH FREE LIFT CYLINDERS

TM 10-3930-644-14&P

been correctly Installed at the outer cylinder

(CLUSTER TYPE) INSTALLATION

rams, and that the chain adjusting screws and

locknuts have been installed.

CAUTION

5. Attach a properly rated hoist chain to the

Prior to lift cylinder Installation, be

cylinder cluster assembly and maneuver cluster

certain that all parts are clean and

assembly into its relative mounting position

that there is no foreign matter in the

within the Inner and outer masts.

shell assembly.

1. Attach a properly rated hoist chain to the

6. Install the attaching capscrews which secure the

intermediate mast (TRI-MAX only), single lift

cylinder cluster to the inner and intermediate

cylinder, and carefully maneuver the cylinder

masts (outer mast, HIGH-FREE LIFT). Tighten

into its relative mounting location.

mounting bolts.

2. Install and secure the washer and nut which

7. Replace the chain guard and connect the

attach the single cylinder to the bottom of the

hydraulic line between the cylinder cluster and

outer mast assembly (TRI-MAX only). Install

the single cylinder (TRI-MAX only).

and secure the washer and screw which attach

cylinder to bracket at top of intermediate mast

8. Install and reconnect the cylinder cluster lift

assembly. Remove hoist chain from cylinder

chains at the cluster adjusting screws.

after the intermediate mast retaining clamp has

been replaced.

NOTE

Refer to CHAIN ADJUSTMENT in

3. Replace all fittings and clamps previously

Topic 1, prior to operational use of lift

removed from cylinder, and install the flow

truck.

regulator.

9. Install carriage assembly. (Refer to CARRIAGE

4. To Install the cylinder cluster assembly, first

INSTALLATION Topic.)

ensure that the crosshead assemblies have

TOPIC 3. CARRIAGES

A. DESCRIPTION

The mast fork carriage is a heavy duty structure of

The following procedures are recommended for the

welded steel, built to provide ultimate strength and

proper removal of the respective fork carriages noted:

visibility, with a minimum of overhang from the center of

the drive wheels to the face of the forks.

TRI-MAX AND HIGH FREE LIFT CARRIAGE

REMOVAL

The fork carriages are of different types and Include

adjustable side thrust rollers, side thrust plugs, or wear

1. Remove carriage forks.

plates with shims to ensure that the carriage is centered

with the Inner mast upright. Load rollers are included in

2. Block inner mast to allow approximately 24"

all of the fork carriages to provide smooth carriage

clearance between the bottom of the mast and

movement with a minimum of friction.

the floor.

The fork carriage used with the Tri-Max mast utilizes ball

3. Remove the capscrews and spacer from the

bearings with shims to center the carriage with the mast

carriage roller support.

section.

4. Attach a suitable hoist to the fork carriage, then

An optional item used in conjunction with the fork

remove the lift chain anchor pins and disconnect

carriage is the backrest. This assembly is a welded

the chains from the carriage.

metal frame which is attached to the carriage (against

the uprights vertically) and serves to prevent loads from

5. Ensure that no attachments secure the fork

resting against the mast when the mast assembly is

carriage to the mast assembly, then carefully

tilted back.

lower the fork carriage out of the bottom of the

inner mast. (See Figure 15.)

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