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Insert a suitable lifting (e.g., 2” x 4” wood member) between the motor underside and the base
frame.
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Remove motor bolts (5) and move motor away from the adaptor flange.
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Remove the coupling element and inspect it for signs of wear and tear such as indentations,
cracks, deformation, extrusions, etc. Replace, if necessary.
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Re-assemble main motor and cooling fan components in reverse.
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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 within 0.79/.85 in (20.0/21.5 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.
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Apply a thread-locking compound to the hub setscrews (M6 size) and tighten to 3.5 lb-ft (4.8 N-
m) of torque. Reinstall coupling guard with provided fasteners.
Interference-fitted Coupling Hub Installation and Removal
– In the event that a coupling hub has to
be removed, please note that these are designed to fit on compressor and motor shafts with a transitional
interference fit. Coupling hubs and their companion shafts which have bore diameters which fall in the
interference range of the design fit must be installed or removed with the aid of a pulling tool and/or heat
dilation. The recommended steps are based on the assumption that the main motor has been pulled
away from the compressor and that the motor adaptor housing is still attached to the compressor.
Coupling Hub Installation:
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Have coupling installation tool part number CC1021458 available – contact Gardner Denver for
sourcing details.
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Mount coupling hub onto tool via provided magnets.
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Make sure that the keyway on the coupling hub and its companion shaft are properly de-burred,
cleaned and that the key fits easily into either.
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Thoroughly cleanse the surface of the companion shaft and cover it with a film of anti-seize
lubricant part number 25BC850 – contact Garner Denver for sourcing details.
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Expose hub and tool assembly to the heat source until the hub reaches a temperature of 200° F.
Note that an oven is a preferred method to heat up the hardware.
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With the help of insulating gloves, remove the hub and tool assembly from the heat source and
quickly bring it to the companion shaft. Engage the coupling hub bore onto the companion shaft
and slide it until the latter contacts the stop. Refer to Figure 8-2 and Figure 8-3 for details of
typical tool aligning the coupling hub onto the compressor and motor shafts, respectively. Note
that hub-to-shaft alignment distances are different.
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Once the hub has cooled down sufficiently to grip the companion shaft, remove the installation
tool.
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Apply a thread-locking compound to the hub setscrews (M6 size) and tighten to 3.5 lb-ft (4.8 N-
m) of torque. Reinstall coupling guard with provided fasteners.