Section VI - Servicing
Input Shaft Seal
NOTE
The QSD™ airend does not contain a scavenge system. A small fluid weep from the seal is normal.
Compressor shaft seals are wear items that may eventually have to be replaced. The input shaft seal on QSD™ units is field serviceable. The internal carbon ring seals on the individual stages are not field serviceable. To replace the input shaft seal, a complete understanding of the installation procedure and special tools are required. Should you decide to replace the seal yourself, ask your Quincy distributor for the complete illustrated instructions (available as a Service Alert) at the time you order the seal and special tools (see parts book for shaft seal and tool kit part numbers). If your distributor does not have a copy of these instructions, they can be ordered from Quincy Compressor at no charge.
Shaft seal replacement on QSD™ units requires the removal of the drive motor to allow use of the wear sleeve removal and installation tools:
1)Remove coupling guards and coupling halves.
2)Remove drive motor.
3)Remove the drive coupling hub and key from the compressor shaft.
4)Remove the four bolts that secure the seal adapter to the suction housing.
5)Insert two of the seal adapter retaining bolts into the seal adapter jack holes and turn clockwise pushing the seal adapter away from the gearcase housing.
6)Check the inboard face of the seal adapter to make sure no shims are removed. Do not lose or damage shims since they need to be reused. Disassemble the seal adapter for inspection or service by taking the following steps:
!CAUTION
After removing the seal adapter, do not allow the outer face of the bearing to move. This will cause the bull gear and shaft to fall in the gearbox, damaging the gear and bearings.
a)With the face of the seal adapter up, insert two small, flat screwdrivers under the outer lip of the fluid slinger and pop the slinger from the seal adapter bore.
b)Using a brass drift, tap the shaft seal assembly from the seal bore.
c)Inspect both seal lips for excessive wear, lip flaws or damage.
d)Inspect the outer
e)To remove the seal wear sleeve, slide the wear sleeve removal tool over the end of the shaft and allow the jaws of the tool to snap on the backside of the wear sleeve. Tighten the outer shell of the tool down over the inner jaws. Using a ratchet and socket, turn the puller jackscrew clockwise in against the end of the compressor shaft. Do NOT use an impact wrench with this tool.
Preparation for New Seal Installation
1)Inspect the compressor shaft for burrs or deep scratches at the wear sleeve area. Using a 100 grit emery cloth, lightly sand horizontally any rust or Loctite® that was between the wear sleeve and shaft. Using a fine file or emery cloth, deburr the key area of the rotor shaft. Cover the keyway with masking tape to prevent any damage to the new seal during installation.
2)Clean the seal adapter with clean, fast drying solvent. Place the outer face of the seal adapter on a flat, hard surface. Remove the new
3)Position the seal so the two lips that face the same direction face the gear and the single lip faces the drive motor.
4)With the lips of the seal facing the correct direction, apply a thin coat of Loctite® 290 to the outer steel case of the seal and position the seal in the seal adapter bore. Insert the seal driver over the seal. Insert the proper wear sleeve driver in the seal driver and tap the new seal into the bore with a medium sized hammer.
4)Preheat the seal wear sleeve to 350°F in a small oven. Do not preheat in warm oil. Apply a thin film of Loctite® to the inner diameter of the wear sleeve and immediately install on the compressor shaft using the proper wear sleeve driver. Drive the wear sleeve on the shaft until the driver bottoms on the shaft shoulder.
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