ASSEMBLY
1. Before assembly deburr all parts with a fine file. Determine correct rotor rotation (see
drawing). Check the vane slots for free movement of vanes.
2. On model 2 Pumps start assembly with side of housing that has the dowel pin holes on the
lift side of the housing. On model 3, start on side with dowel pin holes on the right. Note: dowel
pin holes are always on the exhaust side of the pump.
On oil lubricated pumps press the shaft seal in place and place the paper gasket in position on
the housing. Install the endplate with the six hex screws and finger tighten. Drive the 2 dowel
pins in place then tighten hex screws securely.
3. Insert rotor into housing according to rotor rotation and rotation arrows on the pump. (The
pump must be assembled in the same position. This will align the rotor with the endplates and
housing.)
4. Install the slinger over shaft. (green disk)
5. Press bearing on the shaft using a bearing installation tool or arbor press. IMPORTANT—
press on the inner race of bearing only. Pressing on the plastic seal may cause damage to roller
bearings.
6. Invert pump assembly and install the vanes into the slots.
7. Invert 2
nd
endplate as previously done but do not tighten screws and leave dowel pins out.
Install bearing and slinger.
8. Apply downward pressure to rotor shaft so that the rotor bottoms out on the 1
st
endplate,
while pressure is applied tighten hex screws evenly. Drive in dowel pins.
9. Shim the pump and install new bearing covers.
IMPORTANT—The pump should spin freely by hand when complete, if any binding is noticed
repeat step 9.
10. Install cooling fans. Install all safety guards prior to starting unit.
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