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4 — MAINTENANCE
4-15
7. Remove the upper jib beam pivot pin at the top end of the beam. If needed,
drive out the pivot pin with a hammer and a brass or hardwood drift.
8. Before removing the bottom pivot pin, insert a long blade screwdriver through
the top pivot pin bores.
9. Remove the pivot pin at the bottom end of the upper jib beam. If needed, drive
out the pivot pin with a hammer and a brass or hardwood drift. Remove the up-
per jib beam.
10. Fully retract the jib beam cylinder. Turn off the key switch and remove the key.
11. Tag the hydraulic hoses that connect to the left and right ports of the cylinder
valve block.
12. Sketch the location of wire ties that secure the hydraulic hoses at the cylinder.
The hoses must be properly secured to prevent pinching during jib boom opera-
tion. Cut the wire ties from the jib boom cylinder hydraulic lines.
13. Place absorbent drip cloths below the cylinder ports. Remove the hydraulic
hoses from the jib boom cylinder. Plug the hose fittings to prevent fluid leakage.
Protect exposed cylinder ports with plugs and caps.
14. At the top of the cylinder, unscrew and remove the keeper pins from both sides
of the boom pivot pin. Secure the keeper pins to the mating beam for use during
cylinder installation.
15. Support the weight of the jib boom cylinder using an overhead hoist and lifting
straps.
16. Drive out the pivot pin with a hammer and a brass or hardwood drift and re-
move the jib boom cylinder.
17. After repairing the hydraulic cylinder, reinstall the cylinder in the reverse order
of removal.
18. Power up the hydraulic system and check for leakage. Tighten the hydraulic fit-
tings as needed.
19. Bleed entrapped air from the hydraulic cylinder according to instructions in
paragraph 4-4.