Inspect the ends of the rotor shaft to find the reference mark made during disassembly to ensure
correct rotor-end cover-cylinder relationships. Once determined slip the rotor assembly into the
cylinder and the bearing into the end cover bore. The bearing should slip in the cover house easily
with only a slight tap with a rubber mallet. If the fit is extremely tight, the end cover bore should be
examined for burrs and cleaned up. The bearing must be free to move slightly in and out of the
cover bore without extreme force or damage to the pump will potentially occur.
Support the end of the shaft with the rotor support shaft used during disassembly.
Installing the Vanes:
To install the vanes rotate the rotor so the free vane slot faces the bottom of the cylinder. Insert the
new vane by sliding it along the cylinder wall. Be sure the vanes slide freely in the rotor.
Vanes for the H2, H3, HXL2 and HXL3 model pumps have a radiused edge. Install them with the
radius in contact with the cylinder wall.
Vanes for the H1, HXL4 model pumps have an offset bevel. Install these vanes with the bevelled
edge in contact with the cylinder wall and the leading edge facing in the direction of rotation.
Note: Make sure the vane is oriented correctly. The chamfered edges of the vane must
be inserted into the rotor.
Installing the End Cover:
Repeat the procedure of installing the first end cover until the O-ring (if used) has been fitted into the
groove.
Apply a small amount of grease to the lip of the oil seal, remove the shaft support and fit the end
cover over the end of the shaft. Lift the end cover and rotor assembly to align the dowel pins in the
cylinder face and the end cover dowel pin holes. This procedure sets the seal gap between the
rotor and the cylinder bore.
Once the pins are aligned, the cover can be driven against the cylinder face with a rubber mallet.
Install the end cover retaining bolts and torque them to 29-30 ft/lbs. When tightening work across
the cover, alternating from one side to the other to ensure even pressure.
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