a 5000 psi piston-type, hollow shaft hydraulic motor, the
swivel stem is driven directly by a massive lubricated spline.
The only moving parts are the hydraulic motor, stem, and
packing cartridge. No gears are required, so motor speed
is swivel speed - very low by hydraulic standards, and very
good for long life. This also means service is easy, allowing
the entire hydraulic drive including swivel shaft bearings
and seals to be removed together by simply unbolting and
pulling it down off the stem.
also has unique lubrication and sealing features. Lower
shaft bearings are pressure-lubricated with hydraulic oil,
dual upper seals are pressure-greased, and all seals run
on hardened and ground wear bushings to prevent stem wear
Unique in the
industry, our wash pipes and packing are specially designed
for long life. One special feature is that the packing cartridge
may be installed either way. When installed with the main
packing nut on top and non-rotating, the packing may be
greased while drilling with an air-powered greasing system.
This can extend packing life dramatically during difficult
link hooks, which allow wire line lubricator access to the
gooseneck top connection for horizontal drilling work.