Tuthill M-D Pneumatics 9000 Series, Руководство оператора

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housing (3) in place, being sure dowel pins are installed. Do not bolt at this time.
4. Lay two pieces of 1/8” thick shims on the end plate at the bottom of the housing, parallel to the two rotor
shaft bores. Set each rotor into position in the housing, with the gear end (long shaft) up. Face keyways
in the direction shown in Figure 8. This will position the rotors so they will match the keyways in the
gears. Because of the shims at the bottom of the housing, the rotor lobes will be above the end of the
housing, which is necessary when assembling the gear end.
5. Grease four O-rings (233) and one O-ring (176) and install on gear end plate. Install end plate.
6. Bolt the housing to the gear end plate and pull it up tight. Use six bolts, equally spaced and secure free
end plate against shims at bottom end of rotors. Hand tighten only.
7. Series 31/33/90/91 - Clean the lapped surface of the mating rings (76A) with soft tissue and acetone
being careful not to nick or scratch the surface. Place a few drops of lubricating oil on the surface and
on the O-ring and carefully slide over the rotor shaft while aligning the slot in the mating ring with the
spring pin (300) in the rotor shaft.
Series 35/37/92/93 - Install oil slinger (238) and align slot with pin (300). Install retainer ring (219).
Using tool shown in Figures 17 & 18, install lip seal (12) with lip facing bearing.
8. Coat the rotor shafts with an anti-seize lubricant and press the bearings (9) on the shafts. The bearing
manufacturer numbers and/or an acid dot (inner race) should be up or toward the gears. Use a bearing
pressing fixture shown in Figure14.
9. Loosen bolts holding free end plate to housing then install bearing retainer rings (14) and secure with
cap screws (62). At this time check clearance between rotor lobes and gear end plate. See assembly
drawings for correct gear end clearances. If clearances are not within specification, recheck parts to
find cause of improper clearances before proceeding.
10. Install keys (24) in rotor shafts. Tight fit required. Coat shafts and keys with anti-seize. If new gears are
being installed, disassemble the two-piece gear.
11. Heat the solid gear and the hub of the two-piece gear to 350° F (177° C). At this temperature they
should fit easily on the rotor shafts. Secure with rotor shaft washers (25) and cap screws (29). Do not
install gear shell at this time, allow to cool.
CAUTION
Handle the heated gear and hub with insulated gloves only.
8.2.3 FREE END ASSEMBLY
12. Retighten six free end plate screws by hand. Turn assembly over and support it on blocks, free end up.
13. Remove the six screws and put jackscrews in holes provided in flange of end plate and remove plate.
Take out the two 1/8” shims, and check clearances between end of lobes and housing using a flat bar
and feeler gauges or a depth micrometer. Refer to assembly drawings for free end clearances.
14. Grease and install O-rings (233) and (176). Reinstall end plate and secure with cap screws (26).
15. Install seals or oil slingers using same procedure as in step 7.
16. Install bearings using same procedure as in step 8. Install bearing retainer rings (220), oiI retainer rings
(15), and cap screws (62).
17. Install mounting feet (304) with cap screws (307) and stand assembly on its feet. For horizontal flow
units you may prefer to lay unit on its side with the drive gear to the left. This will make it easier to take
the interlobe readings later. Install the gear shell to the hub, making sure the timing shim (16) is in place,
and bolt it tight.
NOTE
As the second gear is installed, the helical teeth will cause the rotor to turn,
and unless the rotor lobes are in an open position they will jam. To avoid
jamming, rotate the installed gear until the timing mark is at center and then
install the second gear with its timing mark matched to the timing mark on
the installed gear.