Leybold Vacuum Products, TRIVAC A, Dual Stage, Rotary Vane ...

Step F-6 e (Cont'd.)
Figure 5-20. Pulling the Second Stage Pump Cylinder Tight Against th,e
Center Bearing (D2A Pump Model Shown)
REQUIRED ACTION: Repeat Step C-11, except assemble rather than disassemble, to insert the
three vanes (53) into the slots in the high vacuum stage rotor (54).
f. While keeping the partially assembled module vertical, fit an a-ring (47) into the a-ring groove on
the HV-cylinder (55) surface that is facing up (see Figure 5-20).
g. Attach the rear end plate (60) to the partially assembled module as follows:
(1) NOTE: Be sure to attach the rear end plate (60) to the HV-stage end of the module.
The HV pump cylinder (55) is the one with the intake tube portion.
NOTE: The side of the rear end plate (60) that has the bronze bushing faces out.
REQUIRED ACTION: While keeping the partial1y assembled module vertical, align the
rear-end-plate bushing hole with the shaft. Slide the rear end plate (60) down over the
shaft until the machined surface of the rear 'end plate fits tight against the HV stage
cylinder (55).
(2) Align the two alignment holes in the rear end plate (60) with the two alignment holes
in the HV cylinder (55), then use a rubber hammer to drive two short cylindrical pins
(64) until the pin ends are slightly recessed in their alignment holes in the rear end plate
(60) (see Figure 5-21).
/'
h. Turn the partially assembled module over so that the other end faces up, then fit an a-ring (47)
into the O-ring groove in the second stage pump cylinder (46).
'
i. CAUTION: DO NOT CHIP, SCRATCH, OR BREAK THE EDGES OF THE VANES.
NOTE: If you are reusing the old vanes (49), make sure that each used vane is replaced in its same
rotor slot. Also make sure that the orientation of each vane is the same as it was before disassembly
so that each used vane is not turned end-for-end in its slot.
NOTE: Be sure that the slotted edge of the vanes (49) faces the center of the rotor (48) when inserting
the vanes into the rotor.
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TRIVAC "A" Manual,