ASSEMBLY - Continued
Install and tighten buttress ring nut (Figure 16, Item 2) on rod assembly (Figure 16, Item 4).
Install two setscrews (Figure 16, Item 1) on buttress ring nut (Figure 16, Item 2).
· Use extreme caution in slipping piston and piston rings past cylinder mouth threads to
avoid damage to piston seals or case threads.
· Make sure the outer end of cylinder threads are properly lubricated before attempting to
screw head gland into cylinder case. Use caution to avoid cutting o-ring on head gland
as it is slipped past threads and rod assembly in cylinder case. After boom cylinder extend
has been assembled, rod assembly should be pushed all the way in (fully retracted) prior
to the installation of counterbalance valve.
· Failure to follow these cautions may result in damage to equipment.
Before attempting to start piston into cylinder case, carefully oil cylinder threaded area and
piston. The mouth of cylinder case is chamfered immediately behind the threaded area to
compress piston rings during assembly. It may be necessary to oscillate the outer end of
cylinder rod to cause rings to compress as they enter the chamfered portion of cylinder case.
Install assembled rod assembly (Figure 16, Item 4) in cylinder case (Figure 16, Item 3).
Figure 16. Boom Extend Cylinder Assembly.