Carriage, Backrest and Forks

TM 10-3930-630-12

(4) Lift chains over chain bearings and off of

(4) Tension must be equal on both chains and

crossheads and remove chains from mast.

carriage must be level.

d. Cleaning and Inspection.

(5) Tighten locknuts. Check adjustment to see

(1) Clean chains with cleaning compound,

it has not been disturbed.

solvent (Fed. Spec. P-D-680) and dry thoroughly.

(6) Operate lift mechanism and check chain

(2) Inspect chains for bent, cracked or

operation.

damaged links. Replace defective links.

(7) Lower carriage and fully retract cylinder

(3) Lubricate chains with oil (OE/HDO).

cluster. Check for carriage level and forks clearing

e. Installation.

floor.

4-36. Carriage, Backrest and Forks

(1) Refer to figure 4-9 and place chains

a. General. The carriage rides in the masts

through crossheads and around chain bearings.

(2) Connect chains to chain anchors with chain

and rolls on bearings. Lift forks are attached to the

links (fig. 4-9) and cotter pins.

carriage. Connections for the lift chains are provided on

(3) Lower ends of chains to anchors on

the rear of the carriage. The backrest helps to support

carriage (fig. 4-10) and attach chains to anchors with

and steady the load.

b. Inspection.

chain links and cotter pins.

(4) Operate lift mechanism and check chains

(1) Operate lift mechanism and check carriage

for bending or uneven operation. If cylinders are fully

movement. Carriage should move smoothly through

retracted, carriage should be level and forks should not

entire length of inner mast. If carriage binds or catches

touch floor. Refer to f. below to adjust chains.

in mast, inspect bearing alignment and bearings for

Chain Adjustment.

damage.

(1) Check to see that mast is in a vertical

(2) Inspect welds on carriage and backrest for

position and that cylinder cluster is fully retracted.

breaks and damage. Check backrest for bent frame.

(2) Loosen locknuts and adjusting nuts (fig. 4-

(3) Inspect forks and locking pins for damage.

9) on the chain anchors.

c. Removal.

(3) Turn the adjusting nuts to vary chain

(1) Remove screws (1, fig. 4-11), lockwashers

length. Tighten or loosen the chains until the chains are

(2), washers (3) and nuts (4). Remove backrest (5) from

a snug fit and forks barely clear the floor.

carriage.

Figure 4-11. Backrest, removal and installation.

4-22