JLG 534D-10 - Manual (Page 65)

3.37 534D-9, 534D-10 & 544D
Boom
5. Fasten the chain into the clevis by installing the pin
and cotter pin.
6. Torque the jam nuts to 100 lb-ft (135 Nm). DO NOT
use Loctite ® on the nuts.
7. For the 1 in (25 mm) chain, fasten a rope to the end
of the 1 in (25 mm) chain in order to pull it back into
the boom.
8. Attach the chain to the chain clevis at the rear of the
fourth boom section.
9. Carefully pull the chain into the boom until it can be
fastened to the chain clevis.
10. Remove the rope.
11. Fasten the chain into the clevis by installing the pin
and cotter pin.
12. Install the chain adjustment block and mounting
bolts.
13. Torque the chain adjustment block mounting bolts to
340 - 365 lb-ft (461 - 495 Nm).
14. Adjust the retract chains. See Section 3.12.4,
“Adjusting Retract Chains.”
15. Torque the jam nuts to 100 lb-ft (135 Nm). DO NOT
use Loctite ® on the nuts
3.12.7 Extend Chain Removal
The following section explains the removal of the 1 in.
retract chains without removing the boom assembles.
1. Extend the boom far enough to access the chain
anchor and the clevis through the top rear access
hole.
2. Secure the boom sections together to prevent
uncontrolled boom runout when the extend chains
are removed.
3. On the chain being removed, loosen and remove the
jam nut from the rear chain clevis and back off the
adjusting nut on the chain clevis to the end of the
threads. DO NOT completely remove the nut.
4. Remove the chain clevis pin and cotter pin to free
the chain.
5. Install a nylon tie-wrap through the holes in the
chain, making a loop with the tie-wrap and tie a rope
to the loop.
6. Pull the slack to the chain clevis at the front of the
boom.
7. Remove the clevis pin and the cotter pin from the
chain and chain clevis.
8. Install a nylon tie-wrap through the chain holes,
forming a loop and tie a rope to the loop.
9. Carefully pull the chain out of the boom.
3.12.8 Extend Chain Installation
Inspect and lubricate chains thoroughly before
installation. Articulate the chains to make sure all working
surfaces are thoroughly lubricated.
1. At the end of the chain(s) being inserted into the
boom, install a nylon tie-wrap through the chain
holes, forming a loop, and tie a rope to the loop.
2. Carefully pull the chain into the boom to the chain
clevis anchor.
3. Fasten the chain to the clevis with a pin and cotter
pin. Lock the cotter pin.
4. At the other end of the chain, connect the chain to
the clevis fastening the chain to the clevis with a pin
and cotter pin. Lock the cotter pin.
5. Install the chain clevis fastening and adjusting
hardware on both ends.
6. Remove any clamping devises being used to keep
the boom sections from runty.
7. Adjust the extend chains.See Section 3.12.3,
“Adjusting Extend Chains.”
d. Chain Lubrication
After inspection and before being returned to service,
chains must be lubricated with a quality chain lubricant.
The lubricant must penetrate the chain joint to prevent
wear. Applying lubricant to the external surfaces will
prevent rust, but the chains should be articulated to make
sure the lubricant penetrates to the working surfaces
between the pins and links.
To prepare the chain for lubrication, the chain plates
should be brushed with a stiff brush or wire brush to clear
the space between the plates so that the lubricant can
penetrate to the working surfaces.
Lubricant may be applied with a narrow paint brush or
directly poured on, but the chain should be well flooded
with lubricant, and the boom should be extended and
retracted to be sure that the lubricant penetrates to the
working surfaces. All surplus lubricant should be wiped
away from the external surfaces. DO NOT use a solvent
for this wiping operation.
Regular application of lubricant is necessary to make
sure that all working surfaces are adequately lubricated.
In extremely dusty conditions, it may be necessary to
lubricate the chains more often.
Lubrication of chains on machines working consistently in
extreme hot or cold conditions requires special
consideration.