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Page 16
CARE AND MAINTENANCE - MODEL 501
DRIVE SYSTEM ADJUSTMENTS: Hydrostat Chains - Belts - Cable - Controls
Refer to the diagrams on the following pages for the location of adjustment points.
Step 1. Loosen the front and rear mounting bolts of the hydrostat, turn the rear
adjustment bolt downward, which will tension the final drive chain to the
rear wheel. Chain is correctly tensioned when at a point mid-way between
the sprockets chain free play or movement is approximately l/16th of an inch
up and down. Re-tighten mounting bolts.
Step 2. Loosen the (2) bolts which secure the front chain adjustment, refer to
diagram, turn the front adjustment bolt downward using a 5/16th alien
wrench. Correct tension is as in step #1. Re-tighten bolts.
Step 3. Repeat above procedures on opposite hydrostat.
Step 4. Tighten the (2) J-bolts on the T-box mounting plate until each belt has l/8th
to l/4th of an inch free play or movement at a mid-point between the pulleys
on the hydrostats and T-box.
Step 5. Position parking brake lever in the off or disengaged position. This will allow
the belt idler used on the engine to T-box to swing fully and apply tension to
the belt. At this time, check that the cable which pulls the idler to a neutral
position has approximately 1-1/2 to 2 inches of free play. If adjustment is
required, loosen the lock nuts on the cable block and turn cable sleeve in or
out to achieve desired measurement. Re-tighten lock nuts. "NOTE" Cable must
have the above dimension with parking brake released or drive belt may slip,
causing a loss of power.
Step 6. Neutral adjustment must be checked at this time which will require the engine to
be started and the parking brake released. Swing upper control levers outward
and into neutral slots, start engine, use caution when releasing parking brake
as mower may tend to creep or move prior to re-adjustment of neutral settings
on each hydrostat. If adjustment is required, loosen lock nuts at each end of
the control rods and back off the tension bolt on each spring block. Turn
control rod in or out until neutral is obtained on each hydrostat. Re-tighten
lock nuts and tension bolts on spring blocks.
Step 7. 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 are hitting against stop block. "NOTE: Do not allow levers
to travel to completely forward without hitting stop blocks as damage to
hydrostats could result. If adjustment is required, loosen lock nut on lever
stop and turn bolt in to allow lever to hit the stop before resistance is felt
in the hydrostat.
Step 8. Start engine. Drive mower forward and observe driving condition. If mower tends
to pull to either side, re-adjust lever stop on fast side to slow that hydrostat
down and even out the ground speed. Do not speed up slow side as over stroking
of the hydrostat could result in damage to the unit. If upper control levers are
slightly off-set after this adjustment, they can be realigned by bending them
into alignment.