Powermatic 4224B operating instructions Sheave and belt alignment, Sheave/drive belt replacement

NOTE: You may have to tap the end of the spindle with a wood block to move it. (Never use a steel face hammer directly against the spindle.)

Figure 32

5.The bearing lock nut should be tightened just enough to remove end play, and spindle should still rotate freely. Run the lathe for a time, and check for heat from the spindle bearings. If the bearings are running hot, the bearing lock nut is too tight and should be loosened slightly.

6.After the bearing lock nut (D) has been properly adjusted, carefully bend back into place any tabs on the tabbed lock washer (C).

7.Reinstall handwheel and tighten set screws.

9.14Sheave and belt alignment

The motor and spindle sheaves are aligned with each other at the factory, but if any service is performed that affects their alignment it is very important that they be realigned. To realign them, loosen the two set screws on the spindle sheave (E, Figure 33) with a hex key, and slide spindle sheave into proper position. Re-tighten set screws.

When sheaves and belt are properly aligned, there should be no unusual pulsing sounds or noise coming from the belt.

9.15Sheave/drive belt replacement

Replacing the spindle sheave can be a difficult procedure; it is recommended that the headstock be taken to an authorized service center for this.

See Figure 33.

1.Disconnect lathe from power source.

2.Loosen lock handle (A) and lift up handle (B) to raise motor.

3.Tighten lock handle (A) to hold motor in raised position. Slip belt off pulleys.

4.Loosen two set screws on handwheel (F) with a hex key, and pull handwheel off headstock spindle.

5.Loosen and remove bearing lock nut and tabbed lock washer (C/D, Figure 32).

6.Slide spindle a short way out of headstock, just enough to remove sheave or belt.

21

Figure 33

7.If replacing spindle sheave, loosen two set screws (E, Figure 33), and slide sheave off spindle.

8.Install new spindle sheave, loosely securing the two set screws. Make sure the sheave is oriented properly.

9.Slide spindle back into place, install tabbed lock washer, and bearing lock nut (C/D, Figure 32). Check for any spindle play at this point (See section 9.13, “Checking Spindle Play”).

10.Reinstall handwheel and tighten set screws (F, Figure 33).

11.Align new sheave (see section 9.14, “Sheave and Belt Alignment”) then tighten two set screws (E, Figure 33) securely on sheave.

12.Loosen lock handle and allow motor to lower. Do not overtension; a very light pressure on the tension handle is adequate to prevent belt slippage.

13.Retighten lock handle.