Model T33903/T33904 (Mfd. Since 07/23)
-29-
The spindle has twelve speeds that operate
between 210–3020 RPM. Spindle speed is con-
trolled by the configuration of V-belts and pulleys
located inside the belt cover (refer to the speed
chart located under the belt cover).
Changing
Spindle Speed
5. Rotate belt tension lever counterclockwise to
take tension off V-belts (see Figure 33).
Use care when changing V-belts as they
could pinch your fingers. They may also
get hot after extended use so wait to
change speeds if drill has been in use.
Figure 33. Location of belt tension lever.
Belt Tension
Lever
For Example: As indicated on speed chart
inside belt cover, a belt combination of B-3
creates 610 RPM. "B" refers to belt position
between spindle and idler pulley. "3" refers to
belt position between idler and motor pulley.
7. Rotate belt tension lever clockwise until
V-belts are tight.
8. Tighten belt tension locks, tighten (2) hex
nuts shown in Figure 32, then close belt
cover.
To change spindle speed:
1. DISCONNECT MACHINE FROM POWER!
2. Open belt cover.
3. Determine correct spindle speed for
operation (see Choosing Spindle Speed on
Page 28).
4. Loosen (2) belt tension locks, and loosen (2)
hex nuts shown in Figure 32.
Spindle Pulley
Motor Pulley
Idler Pulley
V-Belts
Tools Needed Qty
Open-End Wrenches 14mm .............................. 2
Figure 32. Location of belt tension locks and hex
nut.
Belt
Tension
Lock
(1 of 2)
x 2
— If V-belt is cracked, torn, excessively worn,
or damaged, replace it.
6. Move V-belts onto desired sheaves on motor,
idler, and spindle pulleys (see Figure 34).
Figure 34. V-belt components.
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