Danfoss Turbocor VTT Series Service Manual Download

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M-SV-VT-001-EN Rev. A

18. Remove the remaining screws from the Suction Cover, use four (4) of the removed screws for

jacking screws.

19. Locate the jacking screw holes on the flange and install the four (4) removed screws. Tighten

them evenly in a crisscross pattern. This will slowly push the Suction Cover away from the Volute.

20.  Set the Suction Cover aside and remove the four (4) screws from the jacking screw holes.
21.  Remove the two (2) M12x55 screws located at the 10 and 2 o’clock position on the End Cap.
22.  Insert the Short Guide Pins in these locations. Refer to Figure 153 (Guide Pin Locations).
23.  Remove remaining screws and use a rubber mallet to tap off the End Cap.
24.  Gently slide the End Cap away from the Compressor housing and set aside the End Cap.
25.  Install three (3) Shaft Bolt Torquing Pins in the three (3) holes in the Axial Bearing Assembly.

Refer to the

“Shaft Bolt Torquing Pin”

example in Appendix B. It will be necessary to turn the

shaft bolt on the front of the Compressor in order to engage the pins. These pins will then hold

the shaft in place for the removal of the shaft bolt.

26. Remove the shaft bolt from the First Stage Impeller.
27. Remove the First Stage Impeller. This will require the use of a heat gun to heat up the impeller.

Do not use a torch!

28.  Remove the “T”- Spacer.
29.  Install a nylon shaft protector and cap.
30.   Remove the screws from the Volute at the 10, 2, and 6 o’clock positions, and install Long Guide

Pins in these locations. Refer to the

“Long Guide Pin”

example in Appendix B.

31. Remove the remaining screws from the Volute; use four (4) of these flange screws as jacking

screws to push the Volute off the housing.

32. Take a strap rated at a minimum of 136 kg. (300 lbs.) with a clevis hook on one end and attach

the clevis to the lifting eye on the Volute.

33. Install the jacking screws into the Volute to push it off the housing, being mindful of the nylon

shaft cover to ensure it doesn’t slide out when you pull off the Volute.

34. Carefully lower the Volute to the floor.
35. Remove the Second Stage Impeller. This will require the use of a heat gun to heat up the

impeller.

Do not use a torch!

36. Remove the eight (8) screws and remove the front touchdown bearing/labyrinth seal plate with

the “U”- Spacer.

37. Once all of the eight (8) screws have been removed, insert four (4) of the removed screws into

the Touchdown Bearing/Labyrinth Seal Plate jacking screw locations. Tighten them evenly in a

crisscross pattern. This will slowly push the Touchdown Bearing/Labyrinth Seal Plate away from

the Compressor housing.

38.  Remove the four (4) shims that are located behind the front touchdown bearing.
39.  Release the internal cable tie from the bearing sensor feed through cable.
40.   Disconnect the internal connectors from the Front Bearing Sensor Feed Through and the Front

Bearing Power Feed Through.

41.  Disconnect the external bearing sensor cable from the feed through.
42.   Remove the eight (8) M5 screws holding the feed throughs to the housing.
43.  Carefully remove both feed throughs from the housing. Gently pull the internal connectors

through the housing.

44.   Remove the O-rings.
45.  Remove the four (4) M8x120 screws from the Twin Bearing Assembly.
46.  Install the four (4) jacking screws into the Twin Bearing assembly to push it away from the

housing.

Compressor Components