2. Extend the cylinder rod far enough to allow the head gland to be screwed out of the
cylinder barrel.
3.
Remove the head gland, piston rod and piston as a unit. Remove the lower port tube
fitting before removing the piston from the barrel.
4.
Remove the piston retaining nut.
5. Slide the piston and head gland off the piston rod.
6. If the hold valve is to be serviced, disassemble as required.
NOTE: The hold valve cartridge does not contain any serviceable parts. If the hold
valve cartridge is broken, replace the entire hold valve cartridge.
Replace O-rings, wear rings, seals or other components as required.
ASSEMBLY
Assemble the jack cylinder by reversing the disassembly procedure.
Apply Loctite to the threads of the piston retaining nut before assembly. Torque piston
retaining nut to 900 ft lbs.
As the cylinder components are reassembled, be certain all rings, seals, spacers and
setscrews required in one step are in place before proceeding to the next step. See Group
3 of the parts book for a complete listing of cylinder parts.
445P/N 12261-683 REVISED: January 2015
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