Model G1066R/Z/G1079R (Mfd. Since 02/11)
-45-
Always inspect V-belts for damage or dete-
rioration when adjusting tension. Should
you find evidence of fraying, cracking, or
other damage, replace the belt immediately.
Belt breakage could lead to mechanical
damage or operator injury.
Tensioning/
Replacing V-Belts
To adjust V-belt tension:
1. DISCONNECT MACHINE FROM POWER!
2. Remove right access panel.
3. Loosen motor mount fasteners shown in
Figure 90. DO NOT completely remove
motor mount fasteners.
4. Press down on motor to keep tension on belt.
5. Tighten motor mount fasteners (see
Figure 90), and re-install right access panel.
Figure 90. Locations of motor mount fasteners.
Belts and pulleys will be hot after operation.
Allow them to cool before handling.
G1079R
G1066R/Z
New V-belts often stretch and loosen up during
the first 16 hours of use. After this period, they
should be inspected and re-tensioned if neces-
sary. Replace V-belts if you notice fraying, crack-
ing, glazing, or any other damage. A worn/dam-
aged belt will not provide optimum power transfer
from the motor to the drums.
The sanding drums are driven by two V-belts on
the Model G1066R/G1066Z and one V-belt on
the Model G1079R. The belts must have proper
tension for optimum power transfer. However,
too much tension may cause premature bearing
failure. Proper tension is achieved when the belts
deflect about
3
⁄4" with moderate finger pressure
at the midpoint between the drum pulley and the
motor pulleys (see Figure 89).
Item(s) Needed Qty
Open-End or Socket Wrench 17mm .................. 1
Straightedge (at least 24") ................................. 1
Tape Measure .................................................... 1
Phillips Screwdriver #2 ...................................... 1
Hex Wrench 5mm .............................................. 1
Tension
Figure 89. Proper V-belt deflection.
Motor Pulley
Approx.
3
⁄
4
"
Deflection
Drum Pulleys
V-Belt Tension
V-Belt
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