99903514:TELESCOPIC CRANE: 3A-7
SECTION 3A: CYLINDER REPAIR
20120521
10. Lubricate the inside diameter of the head with a
nonfibrous grease such as Lubriplate.
11. Carefully slide the head onto the rod. Make
certain that the rod wiper does not catch on the rod
when it is first started. Slide the head all of the way
onto the rod and up to the pin boss.
12. Slide the stop tube ring and stop tubes onto the
rod.
13. Lubricate the entire threaded area of the rod and
inside of the piston with non-fibrous grease.
14. Secure the rod in a vise using a pin as was done
during disassembly. Screw the piston onto the rod by
hand. You should be able to get the piston almost all
the way onto the rod before using the spanner
wrench.
CAUTION
MAKE SURE THAT THE LOCK RING SEAL STAYS
IN POSITION. IF IT DOES NOT, LEAKS MAY OCCUR
OR THE PISTON MAY BACK OFF, RESULTING IN
POOR PERFORMANCE AND POSSIBLE
SEPARATION OF THE CYLINDER ASSEMBLY.
15. Using a spanner wrench attachment on a torque
wrench, torque the piston onto the rod per the piston
torque chart.
PISTON TORQUE CHART
THREAD DIAMETER TORQUE REQ’MENT
1/2” ID 30- 40 ft-lb
3/4” ID 100-130 ft-lb
7/8” ID 150-180 ft-lb
1-1/16” ID 300-330 ft-lb
1-1/4” ID 500-530 ft-lb
> 1-1/4” ID 710-740 ft-lb
16. Generously lubricate the outside diameter of the
head and piston with the non-fibrous grease. Also
lubricate the threads and beveled area of the top of t
he cylinder case.
17. With a side-to-side or up-and-down motion, work
the piston into the cylinder past the threads and
beveled area at the top of the cylinder case. Avoid
allowing the seals to rub across the threads. This will
cut them.
18. Slide the piston into the cylinder. With a rotating
motion, work the piston seal and the wear rings past
the threads and hand tighten the cylinder head.
PISTON
PISTON SPANNER/
TORQUE WRENCH
ROTATE
THIS
DIRECTION
TO ASSEMBLE
STOP TUBE
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