Gardner Denver VST55-90B, Operating And Service Manual, Page: 62 / 84

13-17-618 Page 61
8-3
Figure 8-3
– MOTOR REMOVAL HARDWARE

Remove coupling guard by removing four bolts

Remove two bolt/nut/washer combos securing [main motor] rear support to baseframe.

Insert temporary support between adaptor casting and support frame (e.g., wood beam) to
maintain compressor level when main motor is retrieved.

Remove four bolts securing main motor to adaptor.

Slide/Pull main motor away from adaptor until coupling hubs separate and allow removal of
spider.

Inspect coupling element for signs of wear and tear such as indentations, cracks, deformation,
extrusions, etc. Replace, if necessary.

Re-assemble main motor and cooling fan components in reverse order of disassembly.

After engaging each hub on the matching recesses of the coupling element, check that the gap
between the hub flats (see dimension “E” on Figure 8-2) is no less than 1.10/1.18 inches (28/30
mm). A smaller gap will produce abnormal wear of the element by friction and excessive thermal
expansion
– the latter could cause compressor damage by axially displacing the input shaft.
Make sure that keys are in proper alignment with key-ways on hubs.

Apply a thread-locking compound to the hub set screws (M8 size) and tighten to 88.5 lb-in
(10 N-m) of torque. Reinstall coupling guard with provided fasteners.
300ETK810-C
(Ref. Drawing)