168
SJ1044 TH, SJ1044 THS, SJ1056 TH, SJ1056 THS, SJ1256 THS
230790ABA
Section 5 – Procedures Non-Routine Maintenance
Retract Chain Removal (2nd to 4th Boom Section)
1. Disconnect hoses attached to the plate. Refer to
section 5.6-1 boom hoses removal.
2. From the rear of the boom locate and remove
the 4 bolts (2 on right side, 2 on left side)
holding the carrier back plate to the walls of the
3rd section of the boom.
Remove bolts,
nuts and washers
Carrier Plate
Figure 95 Carrier Plate Bolts Removal
3. Lift the carrier plate as much as possible to gain
access to retract chain anchor.
4. Remove chain with anchor from rear of boom
and set aside.
Anchor &
Cotter Pin
Chain
Pin
Snap Ring
Chain Anchor
Figure 96 Rear Retract Chain Anchor 4th boom
section, SJ1056 TH/THS / SJ1256 THS
5. On front of 2nd boom assembly, remove bolts
from retract anchor plate.
Anchor &
Cotter Pin
Anchor Bolt
Chain Anchor
Figure 97 Front Retract Chain Anchor 2nd Boom
Section, SJ1056 TH/THS / SJ1256 THS
6. Pull retract chain from front of boom and
thoroughly inspect
NOTE
Refer to section 5.4-8 for detailed procedure on
how to inspect boom chains.
Install Retract Chain SJ1056 TH/THS
1. Working at the rear of the boom, attach the new
retract chain to the old retract chain by installing
the link pin and a new cotter pin.
2. From the front of the boom, pull the old retract
chain from the front of the boom until the new
retract chain is exposed long enough to attach
to the chain anchor.
3. Remove the cotter pin and link pin that attached
the old chain to the new chain. Discard the
cotter pin and old chain.
4. Position the chain anchor to the retract chain
and secure by installing the link pin and a new
cotter pin.
5. Position the chain anchor to its mounting
location inside of the boom section and secure
by installing screwing 2 anchor bolts.
6. Install slide pads back to their possition. Refer to
section 5.6-3.
7. Torque the bolts to 80 lb.-ft.
8. Start the engine and operate extend/retract
function through several cycles to assure proper
operation. Repair as required.
9. Adjust boom chain tension. Refer to Section
5.4-11 for Chain Tension adjustment procedure.
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