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14
15. Remove the wires from their connectors to free the
cable from the motor. Note and label the positions of the
wires.
16. Remove the four bolts and washers which secure the
motor to the stand.
17. Place the replacement motor on the frame and secure it
loosely with the four bolts and washers.
18. Open the motor plate to expose the electrical connec-
tions.
19. Connect the switch-to-motor cable to the wire positions
noted in step 15, above, then close the motor electrical
cover plate and tighten the cover plate screws.
20. Install the drive disc and hub plate as outlined in steps
11-13, above.
21. Raise the table to its highest position.
22. If the drive disc does not have a grinding disc installed
on it -- install a disc now, using the instructions in Removing
and replacing grinding discs.
23. Slide the motor forward on the frame until the disc is 1/8
inch from the table. Be certain that both the right and left
hand gaps between the table and disc are equal.
24. Tighten the motor mounting bolts securely.
25. Reconnect the machine to its electrical power source.
26. Verify the motor and disc rotation. If you have con-
nected everything correctly, the disc will rotate clockwise
when viewed from the front. If the disc rotates counterclock-
wise, correct the electrical connections according to
instructions in Electrical beginning page 7.
27. The machine is ready to return to service.
Removing and replacing
motor and/or drive disc
In the rare event that damage to the drive disc might
require its replacement, or electrical failure might require
motor replacement, the following procedure can be used.
Since motor replacement requires removal of the drive disc,
these procedures are treated as a single procedure. Ignore
the motor replacement instructions if you are only servicing
the drive disc.
To remove the drive disc from
the motor shaft:
1. Disconnect the grinder from its electrical power source
to prevent accidental start-up and to allow motor replace-
ment without danger of electrical shocks.
2. Lower the table to its lowest position. (See Raising and
lowering the table, page 8.)
3. If you are replacing the metal drive disc, remove the
abrasive disc before proceeding. (See Replacing grinding
discs, facing page.)
4. Remove the socket head screw and washer from the
center of the drive disc.
5. Loosen the two socket head set screws which secure
the drive disc hub to the motor shaft.
6. Loosen the four bolts which hold the motor to the stand.
7. Slide the motor toward the rear of the stand while pulling
the drive disc and hub toward the front of the stand. This is
a combined effort. The disc and hub can be separated from
the motor shaft only if you perform these two operations at
the same time.
8. Slide the drive disc and hub off of the motor shaft.
To replace the drive disc:
9. Remove the three bolts and washers which hold the
disc to the hub.
10. Position the new disc on the hub and secure it with the
bolts and washers.
11. Align the support plate keyway with the key on the motor
shaft and slide the hub plate onto the motor shaft as you
also pull the motor forward on its plate. Do this until the
assembly bottoms out against the shaft.
12. Reinstall and tighten the retaining screw and washer
which screws into the center of the motor shaft.
13. Tighten the two set screws which secure the hub to the
motor shaft.
To replace the motor:
Note: be certain you have performed all of the steps
above -- through step 8 -- which remove the drive disc
assembly from the motor. And, BE CERTAIN YOU HAVE
TURNED OFF POWER TO THE MOTOR AND HAVE
LOCKED OUT POWER TO THE BRANCH ON WHICH
YOU WILL BE WORKING. JET recommends that a
licensed electrician perform all electrical service work for
this grinder.
14. Open the plate on the motor frame where the electrical
service cable enters the motor.
Lubrication
Since the grinder operates in an environment of high
amounts of dust and grit, most lubrication would simply pick
up the grit and cause increased wear to the machine and its
parts. Therfore, the primary method of keeping the machine
working surfaces in good order is KEEPING THE MACHINE
AS CLEAN AS POSSIBLE.
Before using the tilt table or table raising mechanism
the operator should use a stiff brush to remove excessive
dust and grit from the tilt worm-and-sector and/or table
raising rack.
The single exception to this "no-lubrication" recom-
mendation is the right angle drive used for the table raising
rack-and-pinion system. This gearbox is pre-lubricated at
the factory and should require no additional lubrication
unless it is disassembled. If this is done, use Shell Retinax
A or a similar grease to refill the gearbox.
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