JLG E300 Service Manual - Manual (Page 155)

SECTION 5 - HYDRAULICS
3121253 – JLG Lift – 5-13
4. Push the piston to the rod assembly to the end of
the thread and then install the piston nut. When
installing the piston nut, gland and valve, refer to
Table 5-1, Cylinder Assembly Torques.
5. Assemble the rod assembly equipped with gland,
piston and piston nut to the barrel assembly hori-
zontally (avoid pushing it off-center, which could
cause damage to the piston seal or the outside of
the piston).
6. Push the gland thread until it meets the barrel
threads, and then assemble the gland to the barrel.
Phase Check Cartridge
The phase valve is a back-to-back pair of check valves,
one of which is mechanically actuated. This valve is
installed in the piston of the level cylinder and is used to
keep the master and level cylinders in phase.
NOTE: Activating the Level Override Up circuit for 30 sec-
onds can bleed the level circuit.
TEST PROCEDURE
1. Place the machine in the following position:
• Firm and level surface
• Upper boom horizontal (level)
• Upper boom fully retracted
• Jib down
• Platform empty
2. With no load in the platform, activate Level Up for
approximately 20 seconds. If the Upper Boom rises,
the phase valve is not functioning correctly and must
be replaced.
Table 5-1. Cylinder Assembly Torques
Cylinder
Torque Value *
Cylinder Head Piston Nut
Tower Lift 463 lb. ft. (628 Nm) 267 lb. ft. (362 Nm)
Upper Lift 550 lb. ft. (746 Nm) 528 lb. ft. (716 Nm)
Master 463 lb. ft. (628 Nm) 267 lb. ft. (362 Nm)
Level 463 lb. ft. (628 Nm) 267 lb. ft. (362 Nm)
Telescope (AJ) 318 lb. ft. (431 Nm) 267 lb. ft. (362 Nm)
Jib 405 lb. ft. (549 Nm) 267 lb. ft. (362 Nm)
Steer 463 lb. ft. (628 Nm) 267 lb. ft. (362 Nm)
Telescope (AJP) 318 lb. ft. (431 Nm) 267 lb. ft. (362 Nm)
* All torque values ± 10%
Table 5-2. Cylinder Valve Torques
Cylinder Valve Ft. Lbs. Nm
Tower Lift Counterbalance 25-30 34-40.5
Poppet 19-21 25-28
Check Valve 20 27
Coil Nut 4-5 5-6
Upper Lift Counterbalance 25-30 34-40.5
Poppet 19-21 25-28
Check Valve 20 27
Coil Nut 4-5 5-6
Level Counterbalance 25-30 34-40.5
Telescope-AJ Counterbalance 25-30 34-40.5
Load Shuttle 18-20 24.5-27
Jib Counterbalance 25-30 34-40.5
Telescope-AJP Counterbalance 25-30 34-40.5
Load Shuttle 18-20 24.5-27