JLG 1230ES Service Manual - Manual (Page 45)

SECTION 4 - BASE COMPONENTS
3121222 – JLG Lift – 4-9
5. Apply Loctite #222 to the threads of the piston set
screw, thread the screw into the hole in the side of
the piston and tighten to 20Nm (5 ft. lb.).
6. Place a new piston (kban) seal onto the piston.
7. Lubricate the o’ring seals on the cylinder head.
Check that the threads on the cylinder head and
inside the cylinder barrel are clean and free of any
debris.
EXTREME CARE SHOULD BE TAKEN WHEN INSTALLING THE
CYLINDER ROD, HEAD, AND PISTON INTO THE CYLINDER BAR-
REL. AVOID PULLING THE ROD OFF CENTER, WHICH COULD
CAUSE DAMAGE TO THE PISTON AND CYLINDER BARREL SUR-
FACES.
8. Carefully slide the loaded cylinder rod assembly into
the cylinder barrel.
9. Screw the cylinder head in until tight, torque the cyl-
inder head to 55Nm (112 ft. lb.), using the proper
spanner wrench.
10. Reinstall the steer cylinder back onto the machine.
11. Power up machine and cycle the steering left and
right until the steering is working smoothly.
12. Check the hydraulic oil level in the hydraulic oil tank
located on the pump/valve/tank assembly. Oil level
should be between min. and max. on the side of the
tank.
Cylinder Head Installation
1. Cylinder Head (Gland) 2. Spanner Wrench (48mm -
1.89" Dia., 5mm Pin
Dia.)