ASSEMBLY
NOTE: Refer to exploded parts diagrams towards end of manual for additional guidance on how parts
are oriented on pump and slide valve. Assemble the pump in a vertical position. This will align the rotor
with the endplates and the housing.
1)
De-burr all parts with a fine file, especially where endplate removal bolts were digging into
housing.
2)
Determine correct rotor rotation (refer to drawing on previous page). Apply a few drops of oil to
the vanes and check the vane slots for free movement. Set the vanes aside.
3)
Start assembly with one end plate. Press the oil seal in place and position the housing O ring
on the housing. Install the endplate on the housing with the eight hex bolts and finger
tight-
en. Drive the two dowel pins in place and then tighten hex screws securely.
4)
Insert rotor into housing according to rotor rotation. (The pump must be assembled in the same
position as it was disassembled. The rotation can not be changed). Assemble the air pump in
a vertical position. This will align the rotor with the endplates and housing.
5)
Press bearing on the shaft using a bearing installation tool (from tool kit) or an 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 in the slots.
7)
Press the shaft seal in place on the remaining endplate. Insert dowel pins and place O ring in
position on the housing. Install the endplate with the hex bolts and tighten securely.
9)
Press bearing onto shaft as previously done.
10)
Shim the pump as follows: First of all, turn rotor by hand to get a “feel” of how it turns when not
binding on the endplates. With rubber mallet, hit one end of the rotor shaft to push rotor
against opposite endplate. Insert shims and bearing cover on the side with the
shaft you hit. Add enough shims so that the cover is flush with the endplate. Screw in bearing
cover screws. NOTE: You can install three of the six screws equally spaced to save time.
Turn pump by hand, and if rotor feels like it is not binding at all, add more shims until a slight
binding is felt. Once this is done, remove .005” of shims, and then set the remainder aside,
along with the bearing cover. Now, hit the other end of the rotor shaft and repeat process of
adding shims until binding occurs. Remove .005” of these shims and re-install bearing cover
with all screws. Install shims and bearing cover on other side that were previously set aside.
Now turn pump over by hand. IMPORTANT: The pump should spin freely by hand when
completed. If any binding occurs, repeat above process.
11)
Reinstall oiler tubes.
12)
If pump is a SDS HD model, reassemble the Slide Valve HD models by:
a)
Place O rings on pump housing.
b)
Place Slide Valve housing on housing, making sure that the check valve flap
per assembly is properly seated.
c)
Screw in the six mounting bolts on the Slide Valve.
Page 5
IMPORTANT:
When installing the vanes in rotor slots,
make sure that the beveled edges of the
vanes are aligned as shown. Installing
the vanes with the bevel in the wrong di-
rection can cause pump to lock up and
cause damage to the vanes and/or pump.
