16
SPLIT CYLINDER ASSEMBLY
1) Remove any protective cardboard tubes that may have been taped to the exposed ends
of the cylinder rod halves.
2) Prepare a lifting device for the raising of the cylinder halves in the hoistway.
3) Lift the bottom half of the cylinder assembly to a vertical position with the exposed plunger
facing upwards. Lean this assembly to one side and secure. Remove the lifting device
and connect to the top half of the cylinder assembly.
4) The top half outer cylinder barrel and the inner plunger must be lifted simultaneously.
This may require the use of two separate hoisting devices and two nylon straps or cable
slings. When the top assembly is raised, it should hang perfectly vertical, and the plunger
should protrude out of the bottom of the cylinder barrel about six (6) inches. Raise the
assembly until it is higher than the lower assembly by about the same number of inches.
PLUNGER ASSEMBLY
1) Be sure to clean the threads and inspect the O-ring on the bottom of the plunger now
hanging in the air. Lubricate the threads with ‘Lubriplate’ (white grease) or a similar
petroleum-based grease.
2) Maneuver the lower half assembly into position below the upper half. Slowly lower the
upper half assembly until the threaded portion of the upper plunger contacts the
corresponding female thread of the lower piston rod. The initial starting of the thread is
best accomplished by hand, (since damage may be caused if cross-threading occurs at
the start). Once started, protect the surface of the plunger halves if tools are needed to
screw the two halves together. Strap wrenches are the tools of choice.
NOTE
Never use a chain wrench or a pipe wrench. When the two plunger halves are almost
completely screwed together (approximately 1/4 turn from tight), pause for a moment. The
intention is to rapidly rotate the rods together, so that the flat surfaces of the rods mate with
sufficient force to create a torqued joint. No finishing should be required, as the joints have
been very accurately machined at manufacture.
CYLINDER BARREL ASSEMBLY
1) Ensure that the female threads in the lower half cylinder barrel are clean. Inspect the seal
of the O-ring just below the internal threads. Lubricate the female threads and O-ring with
grease as described above.
NOTE: To prevent an external leak from occurring, there
must be no nick or scratches in the o-ring.
Clean the male threads on the upper
cylinder barrel, and lubricate with grease as above.
2) Lower the cylinder barrel of the upper assembly, and carefully start the thread
engagement into the bottom half. The same care and technique should be used, as done
for joining the plunger halves. NOTE: Once the two-section jack assembly has been
assembled, return to the “Jack Installation” section on
page 14.
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