New Holland CX720 Operator's Manual page 429

23. Grain elevator drive chain
The chain is tensioned with a spring loaded sprocket
and does not need any adjustment.
24. Grain elevator chain
The tension of grain elevator chain 1 is correct when
it is just possible to move a link laterally across the
lower sprocket by hand.
NOTE: Check the tension of the chain every 50
hours.
The tension of the grain elevator chain can be
adjusted at the rear of the grain elevator:
Loosen jam nut 1, adjust grain elevator chain tension
with nut 2. Tighten jam nut 1.
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