JLG 534D-10 - Manual (Page 64)

Boom
3.36 534D-9, 534D-10 & 544D
adjustment required. The correct dimension is 17 in
(432 mm).
8. Loosen the adjusting nut (6) at the top front of the
second boom section enough to permit adjustment.
9. Loosen the retract chain jam nut (7) at the bottom
front of the second boom section.
10. Tighten the retract chain adjusting nut to obtain the
17 in (432 mm) dimension.
11. Torque the jam nuts to 100 lb-ft (135 Nm). DO NOT
use Loctite ® on the nuts.
12. Readjust the extend chains as described in Section
3.12.3, “Adjusting Extend Chains.”
3.12.5 Retract Chain Removal
The following section explains the removal of the 1 in
(25 mm) retract chains from the third to first boom
sections without removing the boom assembles.
1. Fully retract the boom and raise the boom to a
horizontal position making sure that the chains are
accessible through the front access holes. Place the
transmission control lever in (N) NEUTRAL, engage
the park brake switch. Shut off machine.
2. Attach a suitable sling to the extend/retract cylinder
and take the weight off the extend/retract cylinder.
3. Remove the cylinder pin from the rod end of the
extend/retract cylinder and lower the cylinder free of
the boom. Lowering the extend/retract cylinder will
allow access to the chains.
4. Remove tension from the chain by backing off the
jam nut and adjusting nut (8).
5. Remove the four bolts (9) from the chain adjustment
block.
6. Remove the chain from the clevis (10) at the block.
7. Install a nylon tie-wrap through the in the removed
chain, making a loop with the tie-wrap and tie a rope
to the loop.
8. Move to the back of the boom and pull the chain to
the rear to allow slack for removal.
9. Remove the chain from the clevis and drop it free
from the boom.
10. Holding the rope at the front adjustment block,
carefully pull the chain out through the back of the
boom until it’s free.
11. Untie the rope and leave it in place for reinstallation
of the chain.
The following section explains the removal of the 3/4 in
(19 mm) retract chains from the fourth to second boom
sections without removing the boom assembles.
1. Remove the jam nut (11) from the chain clevis
installed in the chain adjustment block.
2. Back off the adjusting nut fully on the chain clevis.
DO NOT remove the nut from the clevis.
3. Remove the chain from the clevis, 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.
4. Move to the back of the boom and pull the chain to
the rear to allow slack for removal.
5. Remove the chain from the clevis and drop it free
from the boom.
6. Holding the rope at the front, carefully pull the chain
out through the back of the boom until it’s free.
7. Untie the rope and leave it in place for reinstallation
of the chain.
3.12.6 Retract Chain Installation
Inspect and lubricate chains thoroughly before
installation. Articulate the chains to make sure all working
surfaces are thoroughly lubricated.
Note: Install the 3/4 in (19 mm) chain first.
1. Fasten a rope to the end of the 3/4 in (19 mm) chain
in order to pull it back into the boom.
2. Attach the chain to the chain clevis at the rear of the
fourth boom section.
3. Carefully pull the chain into the boom until it can be
fastened to the chain clevis.
4. Remove the rope.
MX0510
8
9
10
MX0510
11