M977, M985, and M984E1 Crane Maintenance Instructions (Cont)
17-15. ERECTION CYLINDER REPAIR
This task covers:
M977, M984E1, M985
TM or Para
Erection cylinder on
clean work surface.
Special Environmental Conditions
Compound, sealing and thread locking,
Item 26, Appendix C
Oil, lubricating, Item 47.1, Appendix C
General Safety Instructions
Solvent, drycleaning, Item 57, Appendix C
MOS 63W, Heavy wheel vehicle mechanic (2)
Level of Maintenance
Right and left cylinders are
disassembled the same way.
There are two models of erection
cylinders. Model A is used on M977
and M985 vehicles and includes
setscrews and a spacer. Model B is
used on M984E1 vehicles.
Remove holding valve (1), backup
ring (2), preformed packing (3), backup
ring (2), preformed packing (4), backup
ring (5), and preformed packing (6).
Remove two grease fittings (7).
Remove two bushings (8) from each end
of cylinder (9).