28
12. After the end plate is removed, tap out the bearings (9). Remove large O-ring (176).
Series 19/86: Tap out lip seals (12).
Series 55/82/66/69: Pull out by hand the stator portion on the mechanical seal (54). Retain the seal
adapter (74) for reassembly.
NOTE
If the rotor shaft sleeves (239) were removed with the end plate, pull them
out by hand on the 19/86 series. On the other series you must drive them
out with the bearings. To avoid damage to the sleeves do not use any hard
faced hammers or steel punches to drive the sleeves out. Separate the
mating rings from the sleeves.
13. To replace the PTFE washers of the labyrinth seals, remove the retaining ring (219), two wave springs
(282), steel spacers (281), and PTFE washers (280).
NOTE
Older units will contain six PTFE and seven steel washers in each bore. The
current PTFE washers are thicker, therefore you will only use ve PTFE and
six steel washers when reassembling.
14. Reinstall the end plate without the bearings and seals and secure with six cap screws equally spaced.
Turn the unit over and support with block under the gear end plate.
15. Repeat steps 8,11,12 and 13 to remove non-drive end plate.
NOTE
Do not damage bearing spacer (123) when removing bearings. This spacer
is only used on the free end.
16. Lift the rotors (1) out of the housing (3). Unbolt the gear end plate and lift the housing off. Clean all parts
and Inspect for wear. It is not necessary to remove the oil distribution ttings on the end plates and the
gear cover but they should be checked with compressed air to be sure the ve orices are not clogged.
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, end plate, and covers are O-ring sealed. An RTV silicone sealer or
equal is used on the lip seals and mounting feet.
Dowel pins are used to locate end plate, housing, and covers in the proper location relative to each other. It
is recommended that the gear end rotor shaft bearings along with all other replacement parts be purchased
from Tuthill Vacuum & Blower Systems, to insure the rotor location is correct with the proper end clearance
relative to the gear end plate.
8.2.1 PREPARATION OF END PLATES
1. Make sure all parts are and free of any nicks or burrs caused by disassembly. See page 36 for
dimensions of the seal installation tools.
2. Position end plate with bearing bores up (ange side down) and install components of the labyrinth
seals. Starting with a PTFE washer (200) alternately stack ve PTFE and ve steel spacers in each
bore. Add two wave springs, one more steel spacer and a retaining ring. Compress to seat seal.
To Next Page
Loading...
