Disassembly - JLG 400S Service And Maintenance Manual

SECTION 4 - BOOM & PLATFORM

Disassembly

1. Using a portable power source, attach hose to telescope
cylinder port block. Using all applicable safety precau-
tions, activate hydraulic system and extend cylinder to
gain access to cylinder rod retaining pin. Shut down
hydraulic system.
TELESCOPE CYLINDER
2. Carefully disconnect hydraulic hose from retract port of
cylinder. There will be initial weeping of hydraulic fluid
which can be caught in a suitable container. After initial
discharge, there should be no further leakage from the
retract port.
3. Remove hardware securing telescope cylinder pin to Fly
Boom. Using a suitable brass drift and hammer, remove
the telescope cylinder pin securing telescope cylinder to
fly boom.
4. Remove hardware securing telescope cylinder to the
base boom section.
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NOTE: The telescope cylinder weighs approximately 367 lbs.
(166 kg).
5. Using a suitable lifting device, remove telescope cylin-
der from boom.
6. Tag and disconnect all hoses and wires from front of fly
boom and bottom of base boom for reassembly.
7. Remove hardware securing the front wear pads on base
boom section, remove wear pads.
MAF01910
8. Using a suitable lifting device, remove fly boom from
base boom section.
NOTE: The 400S fly boom section weighs approximately 290 lbs.
(131 kg). The 460SJ fly boom section weighs approximately
350 lbs. (159 kg).
MAF01920
MAF01960
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