Overhaul; Fig. 6-9: Boom Hoist Cylinder Assembly - JLG Lull 1044C-54 II Series Service Manual

Overhaul

Boom Hoist Cylinder
31200079
1
2
3
4
5
# Description
1 45 Degree Elbow
2 Grease Fitting Cover
3 Grease Fitting
4 Self-Aligning Bushing - Base End
5 Cylinder Barrel
6 Hollow Hex O-ring Plug
7 Hollow Hex O-ring Plug
8 Counterbalance Valve Cartridge

Fig. 6-9: Boom Hoist Cylinder Assembly

(Ref. Fig. 6-9) The following steps are required to overhaul boom hoist
cylinders.
1. Mount or support cylinder vertically with rod end down. Hydraulic oil in
cylinder will drain out during disassembly. Place a suitable pan or tray
under the cylinder.
2. Release oil pressure in the cylinder as follows:
WARNING: The counterbalance valve cartridge traps hydraulic oil in the
cylinder which may be under pressure. Wear proper eye and
hand protection when removing counterbalance valve
cartridges. Hydraulic fluid under pressure can be injected
under skin or into eyes, resulting in serious personal injury or
death.
8
7
6
11
12
10
#
9 Rod Nut
10 Piston
11 Set Screw
12 Rod Bearing Head
13 Cylinder Rod
14 Self-Aligning Bushing - Rod End
15 Grease Fitting
16 Grease Fitting Cover
Boom and Transfer
9
16
13
15
14
MV0620
Description
6-15