JLG 534D-10 - Manual (Page 46)

Boom
3.18 534D-9, 534D-10 & 544D
strain relief fittings on the cable. Do not tighten at
this time.
5. Pull the electric cable through the boom to the
correct position at the boom head.
6. Install the cable wires into the socket, See Section
3.6.1, “Electrical Wire Data,” for wire locations.
7. Install the socket into the bracket at the boom head.
Tighten the strain relief fitting at the socket and tube.
Install and tighten the cable clamps at the boom
head.
8. Install the cable take-up weldment and support at
the bottom front of the first boom section.
9. Tighten the strain relief fittings at the cable take-up
weldment area.
10. Install the cable clamps to the bottom front of the first
boom section.
11. Plug the receptacle connector into the frame cable
wiring harness.
3.7 EXTEND/RETRACT CYLINDER
REMOVAL AND INSTALLATION -
THREE SECTION
The extend/retract cylinder hydraulically extends and
retracts the second boom section. A cable sheave
arrangement is designed into the system to extend and
retract the third boom section in proportion with the
second boom section.
The 534D-9 and 534D-10 extend/retract cylinder is
installed in a push beam. The base end of the cylinder
mounts into a structure at the rear of the first boom
section called a strong back. The rod eye end of the
cylinder mounts into the push beam. The push beam is
fastened to the rear of the second boom section. As the
cylinder rod extends or retracts, the push beam moves
the second boom section proportional.
Re-pack kits for the extend/retract cylinders are available
from your Authorized JLG Distributor.
3.7.1 Extend/Retract Cylinder Removal
1. Remove any attachment from the quick switch
assembly. Refer to Section 3.16.1, “Disconnecting
from an Attachment.”
2. Park the machine on a hard, level surface, retract the
boom and line up the push beam extend/retract
cylinder rod eye access holes (1) in all three boom
sections, level the boom assembly, place the
transmission control lever in (N) NEUTRAL, engage
the park brake and shut the engine OFF.
3. Place a Do Not Operate Tag on both the ignition key
switch and the steering wheel, stating that the
machine should not be operated.
4. Open the engine cover. Allow the system fluids to
cool.
5. Remove the battery negative (-) cable from the
battery negative (-) terminal.
6. Remove the cylinder rod eye mounting pin.
7. Loosen and remove the extend/retract cylinder
hoses at the rear of the boom assembly. Plug the
hose ends to prevent dirt and debris from entering
the hydraulic system.
8. Loosen and remove the fittings from the rear of the
extend/retract cylinder barrel.
9. Attach a lifting tackle to the extend/retract cylinder,
remove the mounting pins and carefully pull the
extend/retract cylinder free of the machine through
the strong back.
10. Place the extend/retract cylinder in a designated
area for the next operation.
MX0310
Ground (Yellow)
“TM” Extra (Orange)
“A” Open
“S” Mast (Black
“RT” Swing (Blue)
MX0220
1