CAMCORP Blower Package with M-D Pneumatics Blower - Manual (Page 24)

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6. Install keys [24] in rotor shaft keyways. Tight fits are required.
7. Lubricate shafts and keys and press drive gear (right hand helix) on drive rotor. To install driven gear, align
reference marks as shown in Fig. 6B. Tap gear with mallet to start then press the gear until seated. NOTE: All
timing gears must be used in sets as they are matched and serially numbered.
8. Install gear washers [25] and secure with cap screws [29] using a few drops of Loctite ® #242 (Removable Thread
Locker) on each screw.
9. Remove assembly from press and stand on workbench with gears down. Place blocks under end plate to prevent
assembly from falling over. Drive gear should remain on left side.
10. Install rotor housing [3] and secure temporarily with two cap screws evenly spaced.
11. Check clearances between end of lobes and housing using a flat bar and feeler gauges or a depth micrometer.
Refer to assembly drawings for drive end clearances.
Drive End Assembly
12. Repeat instructions given in steps 3 and 4 to assemble drive end plate and temporarily secure with two cap
screws evenly spaced.
NOTE: 4500 Models Install Free End Spacers on Shaft (Item 123)
13. Lubricate shafts and install roller bearings [10] on 4600 models.
On 6000 models the drive rotor bearing [50] is a larger bearing
than the driven rotor bearing [10].
NOTE: The inner races of all roller bearings have a flange on
one side only. This flange must face inward, See Fig. 8.
NOTE: For 4500 Models the inner race flange must face outward.
14. 4600 Models
Install one wave spring [282] on drive rotor and two wave
springs with spacer [281] between on the driven rotor.
NOTE: 4500 Models have no wave springs to install.
Model 6000: Install two wave springs [282] with spacer [281]
between on both rotors.
Secure with retainer plate [14] and cap screws [62].
15. Install spring pin [68] in driven rotor, oil slinger [20] washer [27]
and secure with cap screw [29] or [307].
16. Apply thin coat of sealer to O.D. of drive shaft seal [13] and press into end cover [6] bore. Lip must face inward.
17. Remove temporary screws, then place a bead of silicone sealer around the perimeter of the end plate. Carefully
slide cover over drive shaft. Make sure dowels [126] are in place. Secure with cap screws [26]. Lay assembly
down with drive gear on the left for timing.
Adjusting Rotor Interlobe Clearance
18. The driven gear is made of two pieces. The outer gear shell is fastened to the inner hub with four cap screws and
located with two dowel pins. A laminated shim, made up of .003” (.076 mm) laminations, separates the hub and
the shell. Removing or adding shim laminations moves the gear shell moved axially relative to the inner hub.
Being a helical gear, it rotates as it is moved in or out and the driven rotor turns with it, thus changing the
clearance between rotor lobes. Changing the shim thickness .014” (.36 mm) on a 6000 model will change the
interlobe clearance approximately .005” (.13 mm). On a 4600 model it would take approximately .012” (.30 mm)
shims to effect the same change.
EXAMPLE: Referring to Figure 9 on page 13, check the clearance on a 6000 model at AA (right-hand reading)
and BB (left-hand reading). If AA reading is .017” (.43 mm) and BB reading is .004” (.10 mm), by
removing .018” (.46 mm) of shims, the readings should then read: AA .011” (.28 mm) and BB .010” (.25 mm).
To determine the amount of shim to add or remove, subtract the smaller reading from the larger and multiply the
result by:
1.2 for Model 4600: .017”-.004 = .013” (.33 mm) x 1.2 = .0156” (.396 mm) or .015” (.38 mm)
1.4 for Model 6000: .017”-.004 = .013” (.33 mm) x 1.4 = .0182” (.462 mm) or .018” (.46 mm)
Round off the amount the closest increment of shims available .006”, .009”, .012”, etc.
To determine whether to add or remove shim: If the right side reading is higher than the left side, remove this amount.
If the right side reading is lower, then add this amount.
Figure 8. Model 4600 Shown.
For Model 4500, Install bearing such
that flange side of inner race faces
outward.