Dixon ZTR 1001 Operator's Manual page 24

CARE AND MAINTENANCE - MODEL ZTR 1001
BELT TENSION 42" & 50" DECKS:
ENGINE TO MOWER DECK BELT:
No adjustment required.
Correct belt tension is maintained through a fixed engine location and a spring
loaded idler system.
A pulsing movement of the belt idler will be observed both during engagement of
the electric blade clutch and actual operation of the mower deck.
NOTE:
MOWER DECK SERPENTINE BELT:
Refer to illustration for adjustment procedure.
Engagement of the electric blade clutch switch may produce a sharp
high pitched chirp or squeal as the belt tension loading is absorbed by
the idler system. This is normal and not a sign of failure.
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