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MODELS KP-6 through KP-16
6" through 16" Series KP screw presses use a key and keyway to couple the screw
inside the hollow bore of the gearbox. It may be that a great deal of force will be
required to push the screw from the gearbox.
The basic procedure is to push or pull the screw out of the gearbox. If the screw is
not tight, the screw is removed easiest by pulling, or by prying with a pry bar.
If it is tight, the screw is removed using a heavy fine-threaded jacking rod to push
the screw out of the gearbox. This rod is threaded through a heavy nut Vincent
has provided inside the hollow bore of the larger size gearboxes. This nut has a
lug that fits in the keyway, to prevent the nut from turning. The nut backs up
against an internal snap ring in the hollow bore of the gearbox. The result is that
the rod pushes against the end of the screw. Liberal use of Anti Seize or Never-
Seez is absolutely required to protect the threads. Loaner tool kits are
available in Tampa; see Screw Change Kit Drawing B-94693.
Alternatively, the screw can be removed by constructing a gear puller, allowing the
use of a hydraulic jack, combined with a cross bar and two long shafts threaded
into the gearbox housing. The holes in the gearbox have metric threads. To avoid
the need for metric all-thread rod, a length of all-thread rod with English threads is
welded to the head of a metric bolt.
If the press has been badly jammed, the key may have rolled inside its pocket. In
these cases it can be impossible to press the screw from the gearbox. It then
becomes necessary to cut the screw in half, between the gearbox mounting plate
and the A plate. The stub shaft can then be bored out in a large boring mill, and
the screw can be repaired at the Vincent factory.
JACKING ROD
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