Skyjack SJ30AJE, Service Manual

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SJ30AJE, SJ30ARJE 196274AF
Boom & Jib Section 5 – Procedures
5.4-4 Master Cylinder Replacement
NOTE
This procedure requires a suitably rated lifting device
capable of supporting the boom arm.
1. Park the MEWP on a firm and level surface and
bring it to the stowed position. Lift the jib until
the platform is about 30 cm (1 ft) off the ground.
2. Use the base controls to raise the riser and main
boom until the master cylinder’s upper pin is
accessible.
3. Place an oil pan inside the riser under the master
cylinder to catch leaking oil.
4. Use tags or a paint marker to label the master
cylinder hoses (x4), indicating where they are
connected to the cylinder.
Front Back
5. Disconnect the hoses one by one, being sure to
plug the hoses and cap the fittings (size 04).
6. Remove the bolt, washer, and keeper pin
securing the upper cylinder pin.
7. Use a rubber coated mallet and driver to tap out
the cylinder’s upper pin.
8. Remove the pin.
9. Pull the top of the cylinder back toward the
knuckle.
10. Remove the oil pan, but leave some rags in place
to catch dripping oil.
11. Lower the riser all the way until the lower knuckle
pins are accessible, taking care not to crush the
dangling hoses.
12. Place a sling around the tip of the fly boom (but
not around the cylinder rod or hydraulic hoses).
Attach the sling to a suitably rated lifting device,
and raise it until there is no slack in the sling.