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Model G0765 (Mfd. Since 5/15)
Timing Belt Tension
& Replacement
The timing belt transfers power from the motor to
the drive pulley (see Figure 89).
Because the molded teeth in the belt fit together
with matching teeth in the pulley, the timing belt
will not slip unless the belt teeth become overly
worn or belt tension is overly loose.
An improperly tensioned timing belt will slip, which
quickly causes it to become damaged and unsuit-
able for further use. Therefore, it is essential to
maintain belt tension properly to prevent slippage.
Once a timing belt begins to slip, it must be
replaced in order to regain proper power transmis-
sion.
Tools Needed Qty
Hex Wrench 4mm .............................................. 1
Hex Wrench 5mm .............................................. 1
Open-End Wrench/Socket 10mm ...................... 1
Phillips Head Screwdriver .................................. 1
Punch & Hammer or
Adjustable Spanner Wrench .............................. 1
Black Fine-Tip Felt Marker ................................ 1
Tensioning Timing Belt
1. DISCONNECT LATHE FROM POWER!
2. Perform Steps 2–5 on Page 61 to remove
components to access timing belt.
3. Verify belt is centered on drive pulley (see
Figure 89) by hand-rotating chuck. The belt
should be seated so it does not contact head-
stock or hang out at end of pulley.
— If belt is not centered, loosen motor mount
hex nuts (see Figure 89), re-adjust motor
position and re-tension belt.
4. Loosen both motor mount hex nuts.
5. Ensure belt teeth are properly engaged in
pulley notches, push down on motor with
light/moderate pressure, and tighten motor
mount hex nuts.
Note: Position motor so you can access
brush cap through hole in bed.
The timing belt is correctly tensioned when
there is approximately
1
⁄8" deflection when it
is pushed with moderate pressure, as shown
in Figure 90.
Figure 89. Timing belt and motor mount hex
nuts (components removed for clarity).
Motor
Mount
Hex Nuts
Motor
Pulley
Pulley
Deflection
Pulley
Figure 90. Correct timing-belt deflection.
1
⁄8"
—If there is more than
1
⁄8" deflection when
timing belt is pushed with moderate pres-
sure, loosen motor mount hex nuts, and
adjust tension until it is correct.
6. Perform Steps 9–11 on Page 61 to re-install
components you removed earlier.
Timing
Belt
Drive
Pulley