JLG X23J - X700AJ Service Manual - Manual (Page 442)

SECTION 5 - HYDRAULICS
5-16 – JLG Lift – 3121448
NOTE: The following are general procedures that apply to
all of the cylinders without sensor. Procedures that
apply to a specific cylinder will be so noted
CYLINDER REPAIR WITHOUT SENSOR
Rod Removing
General Cylinder Disassembly
1. Clean the cylinder with a suitable cleaner before dis-
assembly. Remove all dirt, debris and grease from
the cylinder.
2. Clamp the barrel end of the cylinder in a soft-jawed
vise or other acceptable holding equipment if possi-
ble.
Figure 5-46.
AVOID USING EXCESSIVE FORCE WHEN CLAMPING THE CYLIN-
DER IN A VISE. APPLY ONLY ENOUGH FORCE TO HOLD THE CYL-
INDER SECURELY. EXCESSIVE FORCE CAN DAMAGE THE
CYLINDER TUBE.
Remove the counterbalance valve from the side of the cyl-
inder barrel.
DO NOT TAMPER WITH OR ATTEMPT TO ADJUST THE COUNTER-
BALANCE VALVE CARTRIDGE. IF ADJUSTMENT IS NECESSARY,
REPLACE THE COUNTERBALANCE VALVE WITH A NEW PART.
NOTE: Cylinder can have residual pressure inside.
When the cylinder has been emptied pull out the rod ~
15mm and loosen the head until ~ 15mm.
Figure 5-47.
WHEN SLIDING THE ROD AND PISTON ASSEMBLY OUT OF THE
TUBE, PREVENT THE THREADED END OF THE TUBE FROM DAM-
AGING THE PISTON. KEEP THE ROD CENTERED WITHIN THE
TUBE TO HELP PREVENT BINDING.