CAMCORP Blower Package with M-D Pneumatics Blower - Manual (Page 23)

11
Assembly of Blower
The assembly procedure is generally the same for all series, but where there are differences, notations are made.
Dowel pins are used to locate end plates, housing and end covers in their proper location relative to each other. Be sure
they are in place.
It is recommended that the gear end rotor shaft bearings be purchased from Tuthill Vacuum & Blower Systems, as they
are specially ground to locate the rotors with correct end clearance relative to the gear end plate.
Make sure all parts are clean and free of any nicks or burrs caused by disassembly. Refer to page 13-14 for seal pressing
tools as well as other assembly tools required.
It is suggested that long feeler gauges (12" [250 mm]) be used to check the interlobe timing, preferably (2) .006” (.15
mm), (1) .005” (.13 mm), (1) .004” (.10 mm), and (1) .003” (.08 mm). This will give you all the combinations
from .003” (.08 mm) to .021” (.53 mm) and also .024” (.61 mm), which is the total.
CAUTION: All cap screws used on EQUALIZER ™ models are metric. The use of anything other than metric cap
screws will result in thread damage. All pipe plug and oil breather holes are National Pipe Thread (NPT).
Preparation of End Plates and Rotors for Assembly
1. Apply a thin coat of sealer to O.D. of lip seal [12] and press into seal bores of both end plates [4]. Make sure seals
are fully seated without deforming. Seal lip should face up towards the bearing. Lubricate lip with grease.
All models except 6000:
If the rotor shaft sleeves [239] are being replaced, lubricate shaft and press on new sleeves with inside chamfer facing
lobes (O.D. chamfer faces outward). Install seal rings [58] into grooves of rotor shaft sleeves on gear end only and lock in
place by compressing ring. Center rings on sleeves. Seal rings for drive end of shafts will be installed later in the
assembly.
Model 6000:
Sleeves are installed in the same manner as above except a silicone sealer must be applied to the two milled indentations
in the shafts on the gear side of each rotor. After the sleeve is pressed on, remove any excess sealer that has squeezed
out between sleeve and lobe. It is not necessary to seal the shafts on the other end.
ATTENTION: All rotor sleeves or seal journals MUST be polished to remove any scratches or nicks. Failure to
polish seal journals could result in seal leakage.
Gear End Assembly
2. Stand rotors on press with drive rotor [1] on the left, making sure
keyways are properly positioned as shown in Figure 7. You may
use the drive end plate as a temporary fixture to support the rotor
lobes while pressing on the bearings and gears.
3. Install gear end plate [4] over the rotor shafts making sure the oil
feed holes for the bearing bores are properly located in relation
to the drive rotor.
Note: Two oil feed holes for each bearing bore must always be at the
top when the assembled unit is standing on its feet. Units can
only be assembled for top drive, left drive, or right drive.
The seal rings should glide into their respective bores with ease.
4. Lubricate shafts and press double row ball bearings [9] onto
shafts and into end plate bores. Use bearing pressing tool
shown on page 13-14.
CAUTION: These bearings have flush ground faces and should be installed with manufacturer numbers up
(toward gear). If no numbers appear on either side, look for a black dot (acid mark) on the inner race.
Install with dot up. Do not use bearings that have not been flush ground within .001” tolerance.
5. Install bearing retainer rings [14] and secure with cap screws [62]. At this time, using feeler gauges, check the
clearance between the face of the end plate and rotor lobes. Refer to assembly drawings for gear end clearance. If
clearances are not within specifications, recheck parts to find cause of incorrect clearances before proceeding.
Figure 7.