JLG 4394RT Service Manual - Manual (Page 104)

SECTION 3 - CHASSIS, PLATFORM & SCISSOR ARMS
3-68 – JLG Lift – 3121249
3.9 SCISSOR ARMS
Lift Cylinder Removal
REMOVAL:
NEVER WORK UNDER ELEVATED SCISSOR ARMS WITHOUT
FIRST PROPERLY BRACING/BLOCKING SCISSOR ARM ASSEM-
BLY.
1. Remove platform (refer to Figure 3-37.).
2. Elevate the scissor arm assembly enough to gain
access to the upper and lower connection pins (2,
6). Block/brace scissor arms and disable machine.
3. Disconnect, cap and label all hydraulic lines con-
nected to lift cylinder (1). Disconnect and label all
electrical wires connected to lift cylinder.
4. Attach lifting straps to overhead crane and lift cylin-
der and support cylinder before attempting to
remove from arm assembly.
5. Remove the upper pin (2) by removing the bolt (3),
nut (4) and collar (5). Push pin out.
6. Remove the lower pin (6) by removing the bolt (7)
and nut (8). Push pin out.
7. Carefully lift cylinder up and out of arm assembly.
INSTALLATION:
1. Follow Removal Steps in reverse.
2. After assembly, operate lift cylinder to ensure proper
operation.
NOTE: Refer to Figure 4-29., Lift Cylinder for cylinder break-
down.
Top Connection Point
Bottom Connection
Point
1
6
7 8
1
3
4
2
5
1. Lift Cylinder
2. Pin
3. Bolt, 3/8"-16NC x 3"
4. Nut
5. Collar
6. Pin
7. Bolt, 1/2"-13NC x 1 5/8"
8. Nut
Figure 3-41. Lift Cylinder Removal