JLG 19BD Service Manual - Manual (Page 42)

SECTION 2 - SERVICE PROCEDURES
2-20 – JLG Lift – 3121154
Cylinder Installation
To install the lift cylinder reverse the Lift Cylinder Removal
instructions at the start of this section, however perform
the following additional steps during re-assembly.
1. Apply Loctite #222 (purple) and torque to 85 ft. lbs.
the cylinder mount shoulder screws securing the lift
cylinder mount halves together at the bottom of the
mast.
2. Check that the platform electrical control cables and
the sequence cables are seated in their sheave
wheel assemblies when extending mast sections for
reassembly.
3. After assembly, readjust the chain at the bottom of
mast section-3 and apply Loctite #242 to the lock
nuts before final tightening.
4. Remove the plastic from under the hydraulic reser-
voir tank cap.
2.9 15BD- MAST ASSEMBLY AND
DISASSEMBLY PROCEDURES
The mast sections are constructed of extruded aluminum,
protected with an anodized surface finish. The mast sec-
tions are interlocked into each other when assembled, by
internally mounted slide pads at the top and bottom of
each mast section. These slide pads run up and down in
slide pad channels on each side of the mast.
The mast assembly contains a number of mast sections
as shown following;
Assembly procedures for all mast sections is basically the
same, carefully slide the mast sections together until mast
ends are even. (When sliding the mast sections together,
be careful not to scratch the anodized surface). Assemble
the hardware to the bottom of mast section first, slide this
section out the top of previous section and assemble
hardware to the top of mast. Always install slide pad shims
with slide pads inserted into the slide pad channels, (ends
of mast sections even). Applying silicone spray onto the
slide pads and slide pad channels before assembly will
help mast sections slide easier after slide pads have been
properly shimmed.
15BD - Mast Disassembly Procedure
NOTE: See Section 2.8 for Mast Assembly Removal Instruc-
tions.
1. After the mast assembly has been removed from the
machine, lay the mast assembly down on a suitable
work table with the platform mounting section on
top, facing up.
2. Remove the sequencing cables and hardware from
the sides of the mast assembly. Also remove the
covers from the top of the mast assembly.
MAST SECTION-4 - REMOVAL
3. Remove chain adjust nuts from threaded ends of
chain attached to the chain anchor plate (lower) on
BOTTOM end of mast section-4 (platform mounting
section). Push threaded ends of chain through
anchor plate.
4. At the TOP of mast section-4, pull chains out and
allow to hang loose. (Be certain floor surface is
clean and free of any metal chips or debris which
may stick to lubricated chains)
Table 2-4. Mast Component Features
Model
No. of Mast
Sections
Extend/Retract
Device
15BD 4 Chain
19BD 5 Chain