Toro AERATOR HC 4000 Operator's Manual page 10

To Check Tractor Ground Speed:
1. Find a test area and measure and mark off 30.5 meters.
2. Operate tractor engine at PTO speed of 540 rpm. Select a
transmission gear and operate the tractor over the test area
(with or without aerator). Record the time necessary to travel
30.5 m.
Note: If tractor lacks a tachometer, measure PTO shaft rpm
with a hand tachometer.
3. Make three passes and record the time intervals. Average oper-
ating time over 30.5 should be between 30–38 seconds. If the
time average is not within 30-38 seconds, select another trans-
mission gear and recheck until the average falls within time
limits.
IMPORTANT: Use the same tractor transmission gear and PTO
rpm settings whenever operating the aerator. Never operate
aerator in any other gear except the one the tractor was timed
in.
Preparing the Aerator:
Select the proper timing gears for the aerator pick-off gear case.
(Gears must be obtained from your Authorized Toro Distributor.)
Use the following chart to determine which gears to use:
Increasing Hole Spacing
Decreasing Hole Spacing
IMPORTANT: Selected num-
ber of gear teeth for the driver and driven gears must add up to
70.
Gear Installation:
1. Remove pick-off gear case cover (Fig. 21).
10
Gears
Sec./30.5 m. Driver
42.3 30
39.9 31
37.7 32
35.5 33
33.6 34
31.7 35
30.0 36
28.3 37
26.7 38
25.2 39
23.8 40
Driven
40
39
38
37
36
35
34
33
32
31
30