Service manual

M411429 101
Section 6 Adjustments
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
WARNING
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120. DRIVE CHAIN TENSION
Refer to Figure 47.
IMPORTANT: After a tumbler has been in
operation over an extended period of time, a “HIGH
POINT” will develop on the cylinder drive sprocket
from 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 tension while slowly
rotating the cylinder sprocket manually. The chain
must be at the “high point” when making the
adjustment. Refer to Figure 47.
Nonreversing Tumblers
a. Remove drive guard, Paragraph 98.
b. To adjust chain tension, loosen jam nut holding
idler sprocket to housing.
c. Move idler sprocket left or right until proper
chain tension is reached, then retighten the jam
nut.
d. Check chain tension.
Reversing Tumblers
a. Remove drive guard, Paragraph 98.
b. To adjust chain tension, loosen nut on idler
housing attaching bolt. Refer to Figure 31.
Move entire idler housing assembly up or down
in the guide rails to change tension.
c. When chain tension is correct, tighten idler
housing attaching bolt. Hold idler housing
firmly in position while tightening nut on
attaching bolt.
d. Check chain tension after tightening nut on
idler housing attaching bolt. Refer to Figure 47.
To avoid bodily injury, disconnect power to
tumbler before performing this operation. To
find the proper tension, apply light thumb
pressure midway between the cylinder
sprocket and the idler sprocket, and adjust
until the chain can be depressed
approximately 1/2 inch (13 mm).
W279
WARNING