JLG 1230ES Service Manual - Manual (Page 108)

SECTION 6 - MAST COMPONENTS
6-8 – JLG Lift – 3121222
7. Disconnect the wire harness connector from the lift
down valve selenoid. Disconnect and cap the
extend and return hydraulic lines on the bottom of
hydraulic cylinder #1.
8. Remove the two (2) bolts attaching hydraulic cylin-
der #1 to the underside of the base frame.
9. Lift the mast assembly free of the frame, place on a
suitable workbench for disassembly.
Mast Disassembly
1. At the top of the mast, remove the bolts and nuts
attaching the cylinder rods for cylinder #1 and #2 to
their cylinder anchor cross bars.
2. Using suitable lifting equipment and strap, slide the
cylinder assembly out the bottom of the mast
assembly, place on a suitable workbench.
Figure 6-9. Hydraulic Cylinder Connections - Removal
1. Lift Down Valve Selenoid
Harness
2. Extend and Return Hydrau-
lic Lines (a)
Note: (a) Open hydraulic lines carefully, have a container ready
to catch draining oil, cap ports and lines immediately once
lines are removed.
Figure 6-10. Hydraulic Cylinder Bottom End Bolts - Removal
1. Cylinder Attach Bolts 2. Hydraulic Cylinder #3
Figure 6-11. Hydraulic Cylinder Top End Bolts - Removal
1. Cylinder #1 Attach Bolt/
Nut
2. Cylinder #2 Attach Bolt/
Nut
Figure 6-12. Hydraulic Cylinder - Removal
1. Multi-stage Hydraulic Cyl-
inder Assembly
2. Lifting Strap