Vogelsang VX Series, Manual

Page: 93 / 202

Rotary lobe pump
Operating instructions
VX100Q, VX136Q..QD..QDM2, VX186Q..QD..QDM2, VX230Q..QD
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8.7.3 Rotary lobe change - VX136QDM2, VX186QDM2 series

Fig. "Rotary lobe change, QDM2 series"
Rotary lobe change of the 2nd stage
(B) in

Fig. "Rotary lobe change QDM2 series"
The rotary lobe change of the 2nd stage is done as described in

Chapter
“Rotary lobe change -
VX136QD, VX186QD series".
Rotary lobe change of the 1st stage (A)
in

Fig. "Rotary lobe change QDM2 series"
1. Dismount the fitting keys (12) from the shafts.
2. Unscrew two hexagon socket head cap screws (13) of the wear plate (14) and remove the wear plate.
3. Loosen the four hexagon socket head cap screws (15) right and left and the two hexagon socket head
cap screws (16) above and below and take off the fixing plate (17).
4. With the VX186QDM2 series, remove the top/bottom angle rings (18) and the sealing plate (19).
5. Take off the shims (20) and the O-rings (21).
6. Remove spacer washer (22) incl. O-ring (23).
7. Pull off the O-ring (24).
8. Take off the fixing plate (25) incl. screwed on wear plate (26).
9. Pull the rotary lobes (11) from the shafts using a rotary lobe puller (see spare parts list).

Pull HiFlo- and HiFlo plus- rotary lobes off the upper and lower shaft in pairs.
10. Install the new HiFlo or HiFlo plus -rotary lobes in reverse sequence

Fig. "Arrangement of HiFlo- and
HiFlo plus ".
11. Assemble in the reverse order. Attention! Install the wear plates as in

Chapter "Wear plate
replacement" (Observe installation position and tightening torques).
12. Close QD cover

Chapter "Closing the QD cover".
13. Apply pressure to buffer chamber

Chapter "Buffer chamber".
Fig. 30 : Rotary lobe change, QDM2 series
(A = 1st stage, B = 2nd stage)