Inversion Kit Part Number(s) for use with Inverted Motor PN 28B0078:

500 Series Motor Inversion Kit w/std 18" shaft (contents below)
Extension Shaft 18" (qty 1)
1/2" Universal U-Joint (qty 1)
1/2" E-Clip (qty 2)
1/8" x 1/8" x 3/4" Machine Key (qty 3)
1/2" x 1" x 7/16" Shaft Collar (qty 1)
Red Fiber Washer (qty 2)
Pulley 15 tooth, 0.810 flange
Shaft Bearing Plate (qty 2)

[OPTIONAL] Extension Shaft 60" - Specify when ordering
[OPTIONAL] Stainless 1/2" shaft coupler by McMaster-CARR
INMOTION does NOT stock this item.  Purchase from McMaster-CARR directly.
RC-050-S-KW / 6099K41
1/2" Bore Rigid Stnls Coupling w/keyway


The 500 Series Motor Inversion kit extends the motor shaft when a motor must be installed inverted (above the head track).  The inversion kit requires an inverted motor, part number 28B0078, ordered from the factory.  The inverted motor is not part of the kit.   A standard motor is not field up-gradable to become "inverted".
The inversion kit includes an 18" keyed shaft, 2 ball bearing shaft plates, a U-Joint coupler, standard motor pulley and various hardware.  An optional 60" shaft is also available.

The E-Clips & fiber washers can be utilized if the installer manually cuts a groove in the shaft or obtains a 3rd party keyed shaft.

NOTE:  The use of the inversion kit is an advanced installer option and not all parts included will be utilized.  The parts included are for typical installs.  

Some form of “thread lock” is HIGHLY RECOMMENDED for ALL set screws!


  1. After the head track is mounted, bore a hole large enough for the shaft and any attached couplers to pass through in the location where the motor drive pulley will engage the belt.  If the shaft will be passing through multiple studs you will need to bore a hole in each one.
  2. Attach the 1/2" U-Joint / coupler to the motor shaft so that the required shaft length can be measured.
  3. Mount the motor with the shaft centered on the holes cut in the previous steps.
  4. Temporarily slide the shaft into position through the mounted shaft bearing plates until the shaft fully seats into the U-Joint coupler.
  5. Verify the shaft alignment, from the drive pulley, through the bearing plates and at the U-Joint.
  6. If a U-Joint is used verify that the maximum angle offset is 25 degrees or less.
  7. Mount the 2 shaft bearing plate assemblies as far apart as possible along the shaft's length.  One plate should be close to the motor side of the shaft while the other is closer to the pulley side.
  8. While leaving enough length on the shaft for the pulley, mark and cut the shaft to length.  Make sure the pulley will engage the belt and the belt will remain level with the head track.
  9. To prevent the pulley from falling off the shaft over time, you must deform the end of the shaft with a chisel in several locations.  During this procedure, make sure you protect the other end of the shaft as you will NOT be able to install the pulley if both shaft ends are deformed.
    • Use a metal chisel to dent the pulley end of the shaft in 4 locations.
    • If the shaft key way extends to the end of the shaft, dent the key way also.