Service manual

M411433 75
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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84. DRIVE TENSION
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.
Nonreversing Tumblers
Refer to Figure 45.
a. Remove drive guard.
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 re-tighten the jam
nut.
d. Check chain tension.
Reversing Tumblers
Refer to Figure 46.
a. Remove drive guard.
b. To adjust chain or belt tension, loosen jam nut
on idler housing attaching bolt, Figure 31, and
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 bolts. Hold idler housing
firmly in position while tightening jam nut on
attaching bolt.
d. Check chain or belt tension after tightening jam
nut on idler housing attaching bolt.
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