26
8.1.3 END PLATE AND ROTOR DISASSEMBLY
13. Stand blower on its free end on 4 x 4 blocks and remove mounting feet (304).
14. Remove end plate cap screws (26). The end plate, with the bearings must be pulled from the rotor
shafts. Use two fixtures as shown in Figure 14. Secure each fixture to the bearing retainer bolt holes
and apply pressure to the ends of the rotor shafts with the center screws or the nuts on the threaded
rods. The pressure should be applied equally to each shaft.
15.
Series 31/33/90/91
- After the end plate is removed, tap out bearings (9), and mechanical seals (76A
& 76B). Remove retainer rings (219) and tap out the labyrinth seals (51).
Series 35/37/92/93
- After the end plate is removed, tap out bearings (9) and seals (12). Remove
retainer rings (219). Oil slingers (238) will come out with the bearings. Do not remove oil retainers
(79) unless they are damaged or end plate is to be replaced.
16. Reinstall the end plate, without the bearings, and secure with six cap screws. Turn the booster over and
support with blocks under the gear end plate.
17. Remove end plate cap screws (26). Remove end plate using same tools used to remove gear end
plate. Remove the bearings and seal parts. Discard all O-rings (233) and (176). Retain mechanical
seal spacers (55) for reassembly 31/33/90/91 series only.
18. Lift the rotors out of the housing. Unbolt the gear end plate and lift the housing (2) off.
19. Wash and inspect all parts for wear and serviceability.
NOTE
On pressure lube units, each bearing is supplied oil through a small orifice
fitting in the end plates and gear cover. It is necessary to remove them but
make sure they are not plugged by checking with compressed air.
8.2 ASSEMBLY
The assembly procedure is generally the same for all series, but where there are differences, notations
will be made. All joints between housing and port fittings, and end plates and end covers must be sealed
with an RTV Silicone sealer or equal. Dowel pins are used to locate end plates, housing, and covers in the
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, as they are specially ground to locate the rotors with correct end
clearance relative to the gear end plate.
8.2.1 PREPARATION OF END PLATES
1. Make sure all parts are clean and free of any nicks
or burrs caused by disassembly. See Figure 13 and
Figure 15 on page 33 for dimensions of seal pressing
tools.
2.
Series 31/33/90/91
- Position end plates with bearing
bores up. Press the labyrinth seals (51) into seal
bores of both end plates. Install retainer rings (219).
Apply thin coat of sealer to O.D. of seal (76B) and
press into seal bore with carbon up. On the free
end plate be sure the spacers (55) are in place
before installing the seals. If no press is available
the bearing pressing plate, Figure 14 can be used.
Care should be taken that no sealer is left on the carbon. Clean with soft tissue and cleaning agent
(acetone) if necessary. Failure to remove will result in leakage.
Series 35/37/92/93
- No subassembly required unless you are replacing the oil retainers (79). Press
them into the bores until seated. No sealer required.
8.2.2 GEAR END ASSEMBLY
3. Place free end plate (4) with flat side up on a pair of 4×4’s. The end plate must be blocked up so the
rotor shafts will not touch the floor when they are installed. Do not install O-rings at this time. Set
Figure 8 - Keyways
DRIVE
DRIVEN
Summary of Contents for M-D Pneumatics 9000 Series
Page 36: ...36 CUTAWAY VIEW FOR MODEL 9000 90 91 VACUUM BOOSTERS ...
Page 37: ...37 CUTAWAY VIEW FOR MODEL 9000 31 33 VACUUM BOOSTERS ...
Page 38: ...38 ASSEMBLY DRAWING FOR MODEL 9000 31 35 90 92 33 37 91 93 VACUUM BOOSTERS ...
Page 40: ...40 ASSEMBLY DRAWING FOR MODEL 9000 BOOSTERS WITH SUBMERGED OIL PUMP ASSEMBLY ...
Page 41: ...41 NOTES ...
