LOAD BACKREST.

6-31.

LOAD BACKREST.

(1) Insert link in end of chain and into brackets

on carriage assembly. Secure link with cotter pins in

a. Removal. Hoist load backrest (6, figures 7-23

ends.

and 7-25) to disengage from carriage and remove from

truck.

(2) Reeve chains over rollers.

Installation. Reverse procedure in a. above.

(3) Secure other end of chain to chain anchor

6-32.

FORKS.

with cotter pin through link ends (29, figure 7-23).

a. Removal. Fully lower carriage, pull handle(2,

(4) Secure chain anchors to outer cylinder with

figures 7-23 and 7-25) fork (1) and disengage fork from

adjustment nuts and adjust chain tension (para. a.

carriage. Repeat with other fork.

above).

b. Installation. Reverse procedure in a. above

e. Triple Mast Assembly Adjustment. Lift chain

positioning forks in desired locations on carriage.

adjustments are provided at base of inner channel (48,

6-33.

CHAIN ASSEMBLIES.

figure 7-25). Lower carriage until hoist cylinder bottoms.

Adjust chain adjusting nuts until slack is removed and

a. Dual Mast Assembly Adjustment. Lift chain

chains are taut.

adjustment is provided at top of outer hoist cylinder.

Lower carriage until hoist cylinder bottoms. Adjust chain

CAUTION

adjusting nuts (30, 31, figure 7-23) until slack is

Be certain load is shared equally by both sets of

removed and chains are taut.

chains, otherwise first chain to begin lifting will

CAUTION

cock mast and cause rapid wear and damage to

hoist cylinder.

Be certain load is shared equally by both chains,

otherwise first chain to begin lifting will cock

Triple Mast Assembly Removal.

mast and cause rapid wear and damage to hoist

cylinder.

(1) Lower carriage until hoist cylinder bottoms.

Dual Mast Assembly Removal.

(2) Loosen nuts (16, figure 7-25) and remove

(1) Lower carriage until hoist cylinder bottoms.

bolt (15) securing chains to anchor of inner upright.

(2) Remove adjusting nuts (30, 31, figure 7-

(3) Remove pins and bottom chain link from

23) securing chain to outer cylinder.

rear of carriage.

(3) Remove pin and bottom chain link from

(4) Remove chain assemblies from truck by

rear of carriage (60).

reeving over rollers.

(4) Remove chain assembly from truck by

(5) Repeat steps (I) through (4) for opposite

reeving over rollers.

chain assemblies.

(5) Repeat steps (1) through (4) for opposite

(6) Remove nut (9) from chain end on outer

chain assembly.

channel.

c. Dual Mast Assembly Repair. Chain repair is

(7) Remove nut (9) from chain end on inner

limited to replacing damaged links.

channel anchor.

(1) With chain removed from truck, use a

(8) Reeve chain over roller and remove chain.

chain breaking tool and remove damaged link or links

from chain. Failure of one link may damage adjacent

(9) Repeat for opposite chain.

links. Remove all damaged links.

g. Triple Mast Assembly Repair. Repair is limited

(2) Install replacement link and rivet pin end to

to replacing damaged links.

secure side plates of chain.

NOTE

(1) Remove damaged links from chain using

chain breaking tool.

Plates of end links are secured by cotter pins.

Do not rivet or peen these pins.

(2) Install replacement links and rivet pin end

to secure side plates of chain.

Dual Mast Assembly Installation.

6-16