21
21
OPERATING ADJUSTMENTS
Belt / Speed Change
1. Disconnect the drill from the power
supply.
2. Remove the lock knob and washer
from the top of the belt cover.
3. Remove the belt cover
4. Use the chart on the face of the
control panel to determine the rpm
desired.
5. Loosen the tension jack bolts (A)
one turn each.
6. Loosen the tension lock knobs (B, one on each side of head) and allow the motor to slide
slightly closer to the spindle. This will loosen the belt enough to allow it to be moved to
another set of pullies.
7. Rotate the pullies by hand and carefully work the belt off of the larger (depending upon the
current speed setting this may be either the spindle or the motor pulley) of the pullies onto a
smaller pulley to remove additional belt tension.
8. Position the belt on smaller of the pullies to be used for the new speed and then rotate the
pullies by hand and work the other end of the belt onto the matching pulley.
9. Tighten each of the tension jack bolts (A) one turn to place the tension back onto the belt.
10. Tighten the tension lock knobs (B) to hold the motor in
position.
Note: Belt tension should be loose enough to
allow 5-10mm movement when pushing the belt from
the side.
IMPORTANT:
The drive belt is a multi-
groove V-belt. The belt must run true and straight
across an even set of sheaves. Do not allow the belt to
run at an angle between the sheaves. Do not allow
even part of the belt to be above or below the sheaves.
11. Install and secure the belt cover using the flat
washer and lock knob removed at the start of the
procedure.
A
B
