Fill the thumb oil can [1] with 93-4575 SYNTHETIC GEAR/BEARING OIL 1GL/3.78L, 93-2365 SYNTHETIC GEAR/BEARING OIL 1QT/0.94L, or other ISO VG68 Oil. 

Use the oil can to fill the three ports [2] on the head of the machine. Fill the ports with 5-10 pumps of oil from the can (approximately 0.33 fl oz or 10 ml). 

Note: Do not overfill. Overfilling can cause leaks. 

The grease port [3] should be filled with 93-3891 GREASE MOBIL XHP 322 5% MOLY or other EP32 grease. 

Switch off mill and unplug from power source. Remove junction box cover. Disconnect the brake switch wiring [1] and cables U, V and W [2]. Disconnect ground [3]. 

Pull conduit out of J-box. 

Note: Record the wiring configuration of your J-box. If it differs from the example given, disregard the example and re-wire according to your notes. 

 Remove three bolts under bearing housing [1]. Insert a flathead screwdriver into each of the gaps in the bearing housing. Lever the bearing housing off of the bearing by pushing down on both screwdrivers at the same time. 

Use a flat head screwdriver to remove the bearing [1]. Lever the screwdriver against the slightly wider section of the motor shaft [2]. Levering it against the spring will not provide sufficient leverage. 

Use two M6 x 45 bolts [1] to tension the spring. Remove the snap ring [2] from the motor.

Remove the bolts on the motor [1]. Change the motor speed to 4200 RPM. 

Pull up to remove the motor. A second person may be helpful to guide the motor out of the casing and ensure that the belt does not get stuck on the shaft. 

Place concave plates [1], tensioning spring, and snap ring [2] on motor shaft. 

Loosely loop a zip tie around the speed change belt. Pull on speed change belt to create slack.

Lower motor to 1-2 inches above the motor casing. Use zip tie to pull belt up and around the bottom concave plate. 

Rotate motor shaft by hand while pulling the zip tie up and around in the same direction to ease belt in between concave plates.

Lower motor into casing. Snip and remove zip tie before setting motor down. Bolt motor into place [1].

Remove bolts from speed change spring. With a rubber mallet, lightly hammer bearing into place on bottom of motor shaft. Rotate shaft continuously to ensure that bearing does not become crooked. 

Place wave ring in bearing housing. Push bearing housing into bearing, and lightly hammer with rubber mallet until bearing housing is within 0.5" of the motor casing. 

Continue to push housing onto bearing by incrementally tightening housing bolts [1].

Re-wire J-box.

Note: If the initial wiring of your J-box differs from the example, ignore the example and re-wire according to the initial wiring of your J-box. 

Remove drawbar cover [1].

Disconnect pneumatic lines from drawbar actuator [1].

Unbolt drawbar actuation assembly [1].

Insert bolts from drawbar actuation assembly into specified holes on the bearing housing. Tighten the bolts incrementally in a star pattern to lift the bearing housing pins [1]. Remove bearing housing [2].

Remove bolts and bolt sleeves [1] from speed change bracket.

Remove bolts under gear housing [1]. Lift off gear housing. Speed change belt can now be removed and replaced. 

Replace gear housing. Replace sleeves and bolts on speed change housing [1]. 

Using a screwdriver or other long tool, press upwards under the top concave plate to ensure that it is all the way at the top of the shaft. 

Replace bearing housing. Tighten bolts in a star pattern [1]. 

Replace drawbar actuator and pneumatic lines. 

Replace drawbar cover. For information on re-installing the motor, see Replace Motor section above. 

Remove top plate from timing gear [1]. Pull belt off of timing gear. 

Remove snap ring from drawbar shaft [1]. Lift off top concave plate [2]. 

Unbolt brake housing [1] and lift off brake assembly. The timing belt may now be removed and replaced.

Remove two bolts on the table [1] and the front of the knee [2]. Remove the front way cover. 

 Turn the y-axis crank counterclockwise to move the saddle to the front of the knee.

Remove the four bolts [1] on the y-axis bearing bracket. 

Engage the Y-axis lock [1]. Turn the y-axis handle clockwise [2] while supporting the bearing braket. The pins will seperate from the saddle. 

Extrude the ballscrew until the ballscrew adjustment tool can fit into the housing. Insert the larger side of the ballscrew adjustment tool into the saddle until it touches the lock nut. Rotate the adjustment tool around the ballscrew until both halves slide into the slots on the lock nut. 

Turn the adjustment tool once counterclockwise to loosen the lock nut. 

 Insert the smaller side of the lead screw adjustment tool into the saddle. Rotate the adjustment tool around the lead screw until both halves slide into the slots on the adjusting nut. 

Turn the adjustment tool to adjust the preload on the lead screw. Test the backlash by turning the axis handle. Adjust the preload until the backlash is between 0.003-0.005" (0.08 to .13 mm). Tighten the lock nut. 

While supporting the y-axis bearing bracket [1], turn the y-axis handle counterclockwise to retract the lead screw. Re-install the bearing bracket and way cover.  

Move the table to the center of the y and x axes. Insert the larger end of the adjustment tool under the left side of the table. Rotate the tool once counterclockwise to loosen the lock nut. 

 Insert the smaller side of the lead screw adjustment tool into the saddle. Rotate the adjustment tool around the lead screw until both halves slide into the slots on the adjusting nut. 

Turn the adjustment tool to adjust the preload on the lead screw. Test the backlash by turning the axis handle. Adjust the preload until the backlash is between 0.003-0.005" (0.08 to .13 mm). 

Tighten the lock nut.