Gardner Denver APEX25-30A, Operating And Service Manual

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13-25-608 Page 67
8. Re-assembly the compressor and associated components in reverse order. Remember to set the
proper spacing between the coupling jaws (24/25.8mm) and tighten the M8 set screws to the
proper torque (10 N-m).
FIGURE 8- 3- COMPRESSOR-MOTOR ASSEMBLY DETAILS
Installation and Removal of Interference Fitted Coupling Hubs.
The coupling hubs are designed to mount on the compressor and motor shafts with a transitional
interference fit [H7 (bore) / k6 (shaft)] that results in a light interference 50% of the time. If such condition
is present for either of the two (2) hubs/shaft combinations, proceed as follows:
Removal:-
1. Use 3-jaws tool 90500151 to remove coupling hub from shaft. A torque not exceeding 130 lb-ft
(176 N-m) should be sufficient to pull hub from shaft. See Figure 8-4 for details.
2. Prior to hub removal, note and record position of shaft end with respect to coupling hub inner
surface. Same offset shall be provide when re-installing the hub.
Installation:
1. Make sure that shaft and hub bore surfaces and keyways are cleansed and de-burred. Also
make sure that keys fit in their matching keyways easily and are in place prior to installing the
coupling hub.
2. Provide a temporary stop on the shaft to insert the coupling hub to the correct offset identified
during the removal process above. Lockjaw self-adjusting pliers provide may be used as stop.
3. Heat evenly the coupling hub until it reaches 250°F (120°C)
– an oven is preferred method.
Using insulating gloves, install the hot hub unto shaft until it hits the stop.
4. After coupling hubs cools down, install the M8 set screw with 10 N-m torque.
FIGURE 8- 4 - Coupling hub removal tool in place