Mammoth V-Cube User Manual
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5. After removing the motor pedestal 5. retaining bolts,
slide the motor/fan/pedestal assembly out to the
point where the motor lifting ring is clear of the cube
frame enough to use. If a mechanical device is avail-
able for use, attach it to the motor lifting ring. Lift
and remove the motor pedestal with motor and fan
wheel from the cube. The motor pedestal with motor
and fan wheel can be turned 180º and slid back into
the cube on the pedestal mounting angles or re-
moved from unit for further disassembly.
6. Mark the location of the trans-torque bushing on the
shaft and the fan. To remove the fan wheel from the
motor shaft, remove the trans-torque bushing retain-
ing hex nut using a 1” socket with a 12” extension by
turning counter clockwise. Loosen progressively until
the bushing is free from wheel hub and motor shaft.
Remove fan wheel/hub assembly (see Figure 19).
7. If needed, the motor may now be removed for ser-
vice by removing all (four) 3/8” motor retaining nuts
and bolts. Be sure to mark the motor base pattern
and bolt holes used on the motor pedestal. Rubber
isolator pads between the motor base and the ped-
estal are optional and if supplied be sure not to lose
them (see Figure 20). If the motor is to be replaced,
make sure to remove the shaft grounding ring off
the front of the motor that is being replaced. Install
the shaft grounding ring onto the new motor by drill-
ing and taping mounting holes. Use a 7/64” or a #35
drill bit and #6-32 tap. Clean away any chips and
shavings before installing the shaft grounding ring.
8. To reinstall the motor, fan wheel and fan wheel/
motor/pedestal assembly back into the cube, reverse
the steps above noting the following:
a. Insert the (four) 3/8” motor retaining bolts into
the holes in the motor pedestal from the under-
side, make sure to use a standard washer on the
bolt side, install the rubber isolator pads (if sup-
plied) between the pedestal and motor base and
only a locknut is required on the motor side.
b. Square the motor on the pedestal according to
markings and tighten the bolts. With rubber iso-
lator pads tighten the bolts to 20 ft-lbs. Without
rubber isolator pads tighten the bolts to 40 ft-lbs.
c. Install the fan wheel on the motor shaft with the
hub facing towards you. Line up the markings on
the hub/trans-torque bushing/shaft. Make sure
that the trans-torque bushing nut is flush to the
hub. Tighten the bushing nut progressively to 80
ft-lbs turning clockwise.
9. Lift the motor pedestal with motor and fan wheel
(turn 180º if placed on the pedestal mounting angles
for disassembly) with the fan wheel inlet toward the
inlet cone. Place motor pedestal into the cube on
the pedestal mounting angles and slide the pedestal
forward to the line that you previously marked. Line
the four pedestal bolt holes up with the bolt holes on
the mounting angles. Insert (four) ½” bolts into the
holes, make sure to use a standard washer on the
bolt side and a standard washer and lock washer on
the nut side. Hand tighten the bolts for now.
10. Check the inlet cone alignment to the fan wheel. Fan
wheel should not be rubbing against the fan inlet
cone when rotated by hand. The fan wheel to inlet
cone clearance should be approximately 1/16” gap
and the overlap should be as indicated in
for the fan wheel size. Adjust the overlap of the
wheel and cone by moving the motor pedestal for-
!
WARNING
Many of the following steps need to be performed with
the unit powered off and locked out. Disconnect the
main power switch to the unit before performing service
and maintenance procedures.
Figure 19: Mark location and remove trans-torque bushing
and fan wheel from motor.
Figure 20: Remove motor retaining bolts; do not lose rub-
ber isolator pads (if provided).
VCES-V-CUBE-IOM-1A
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