Disassembly:
The following instructions are written, assuming that the pump being serviced has been removed
from the base it was mounted on. It is possible to carry out installation of the parts kit with the pump
mounted, but for best results it is recommended that it is removed from the stand.
Warning! Disconnect the pump drive to ensure the pump cannot be accidentally started
during service and to allow the shaft to be rotated by hand.
End Cover Removal:
Before removing the cylinder end cover, clean the outside of the pump to prevent dirt and debris
from getting into the cylinder.
Mark the drive side end cover and the corresponding end of the cylinder and rotor shaft, using a
center punch. Marking these will avoid the possibility of assembling the pump with the end covers
on the wrong ends.
Remove the shaft guard and support the end of the shaft so that the rotor will not drop when the
end cover is pulled from the bearing. A notched piece of wood can be used to support it from
below, or a long nipple can be screwed into the valve above the shaft and a strap can be hung from
the nipple to support the shaft.
For HXL Series pumps, if working from the oil pump end of the cylinder, start by removing the oil
pump guard. The guard bolts are longer than the other end cover bolts so their location should be
noted. Disconnect the oil line to the fitting in the end cover and remove the oil pump. The oil pump
mounting screws are different lengths, so note their locations as they are being removed. Remove
the oil pump drive assembly.
Remove the bolts around the perimeter of the end cover.
In order to maintain factory set clearances avoid damaging the dowel pins during end cover
removal. To properly remove the end cover, work evenly from each side of the cover, which will
help to avoid misalignment of the end cover and bending of the dowel pins. Ensure that the rotor
does not slide out with the end cover. As necessary use a rubber mallet to drive the rotor shaft back
towards the end cover that is still bolted on to free the end cover from the bearing.
When the end cover is far enough away from the cylinder install a second shaft support behind the
end cover and release the first. Slide the end cover completely off the rotor shaft.
Warning! Under no circumstances should the end cover be pried or hammered off of the
cylinder as this will potentially result in damage to the sealing surfaces.
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