JLG H340AJ Service And Maintenance Manual page 222

d. Torque the Piston nut as specified in Table 5-36, Pis-
ton Nut Torque. Lack of the torque can result in
internal leakage, the piston coming unscrewed, and
thread damage. If over torqued, the piston surface
which meets the rod will be damaged.
Table 5-36. Piston Nut Torque
CYLINDER
STEERING
TOWER LIFT
MAIN LIFT
MASTER
LEVEL
JIB
TELESCOPE
RAM LOCK
5. Assemble the rod assembly.
a. Secure the barrel at a vertical or horizontal position.
b. Insert the assembly into the barrel.
c. When piston is inserted to the barrel take care as to
not damage the seal rings.
3121634
SECTION 5 - BASIC HYDRAULIC INFORMATION & HYDRAULIC SCHEMATICS
PISTON
NA
267 ft. lbs.
528 ft. lbs.
267 ft. lbs.
267 ft. lbs.
267 ft. lbs.
267 ft. lbs.
NA
6. Gland assembly.
Install the gland using a spanner wrench as shown
below.
Table 5-37. Gland Torque
STEERING
TOWER LIFT
MAIN LIFT
MASTER
LEVEL
JIB
TELESCOPE
RAM LOCK
7. Caulking.
Caulk at the machined area of the cylinder barrel end so
that it locks the cylinder head in place and it does not
unscrew from the barrel. If there is no caulking hole,
caulking is not necessary.
8. Test operation.
a. Install the cylinder on a machine. Fill the cylinder
with oil and then have the cylinder slowly operated
a minimum of 8 cycles. If it is operated too fast in the
beginning, cavitation will result. It is important to
make sure all air is cycled from the cylinder.
b. Grease the end of the pin.
397 ft.lbs.
463 ft.lbs.
550 ft.lbs.
463 ft.lbs.
463 ft.lbs.
405 ft.lbs.
318 ft.lbs.
NA
5-57