Dixon 5000 Series Operator's Manual page 41

MODELS ZTR 5501 & ZTR 5601 DRIVE SYSTEM ADJUSTMENTS
FORWARD TRAVEL SPEED ADJUSTMENTS:
Stop engine, move levers to drive position, lightly push each upper control lever forward
until a resistance is felt on the lever.
At this time, check that the forward lever stops on the bottom of each lever are hitting the
stop blocks.
If adjustment is required, loosen the lock nuts on the lever stop and turn the bolt in until the
lever hits the stop block before resistance is felt in the hydrostat.
NOTE:
CARE AND MAINTENANCE
Balance of travel speed. If mower tends to pull to either side, re -adjust lever
stop on fast side to slow the hydrostat down and even out the ground speed.
DO NOT SPEED UP THE SLOW SIDE, AS OVER STROKING OF THE
HYDROSTAT COULD RESULT IN DAMAGE TO THE UNIT.
If upper control levers are slightly offset following this adjustment, they can be
realigned by bending them slightly.