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Chain Drive
There is proper tension when the chain can be
depressed approximately 1/2 inch (13
mm) by
applying light thumb pressure at a point midway
between the cylinder and drive sprocket.
IMPORTANT: After a tumbler has been in
operation over an extended period of time, a “High
Point” will develop on the cylinder drive sprocket
through use and wear. Turn the sprocket manually
with drive chain in place until this “high point” is
at the top center. The “high point” can be found by
noticing increased chain tensionwhile slowly
rotating the cylinder sprocket manually.
Nonreversing Models
Refer to Figure 23.
1. Remove guard from rear of tumbler.
2. Adjust belt first.
3. To adjust chain tension, loosen jam nut holding
idler sprocket to housing.
4. Move idler sprocket left or right until proper
chain tension is reached, then retighten the jam
nut.
5. Replace the guard on rear of tumbler.
Reversing Models
Refer to Figure 24.
1. Remove drive guard.
2. To adjust chain tension, loosen nut on idler
housing attaching bolt. Move entire idler housing
assembly up or down in the guide rails to change
tension.
3. When chain tension is correct, tighten idler
housing attaching bolt. Hold idler housing firmly
in position while tightening nut on attaching bolt.
4. Check chain tension after tightening nut on idler
housing attaching bolt.
WARNING
To reduce the risk of electric shock, fire,
explosion, serious injury or death:
• Disconnect electric power to the
tumbler before servicing.
• Close gas shut-off valve to gas tumbler
before servicing.
• Close steam valve to steam tumbler
before servicing.
• Never start the tumbler with any guards/
panels removed.
• Whenever ground wires are removed
during servicing, these ground wires
must be reconnected to ensure that the
tumbler is properly grounded.
W002