Jacobsen GA580, Техническое руководство

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6 OPERATION
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6.7 HOLE SPACING ___________________________________________________________
The front to rear hole spacing is a function of tractor gearing. Some tractors will allow as low as 1 in. (25 mm) spacing.
Spacing greater than 8 in. (203 mm) is not recommended in order to achieve proper aeration/ cultivation.
Because forward travel speeds and PTO speeds are both directly tied to engine RPM, hole spacing should remain
constant for each gear, regardless of engine speed.
NOTE: A constant speed must be maintained by the operator for tractors with a Continuously Variable Transmission
(CVT) because the vehicle speed is not directly tied to engine and PTO speeds. Refer to the tractor’s manuals.
Locate the desired hole spacing in the chart. Calculate the engine speed required to match the desired PTO speed
(
See 5.9 ). Select the proper speed for the desired hole spacing.
If a ground speed chart or decal is not available for the determined engine/PTO speed, the tractor’s ground speed in
mph can be calculated by measuring the distance in feet traveled in 15 seconds and multiply by 0.0454545. When
measuring the distance, the engine must be running at the determined speed.
See 5.9
Example: (Calculating mph)
Distance traveled in 15 seconds = 15 ft
15 ft x 0.0454545 = 0.68 mph
The tractor’s ground speed in kph can be calculated by measuring the distance in meters traveled in 15 seconds and
multiply by 0.24. When measuring the distance, engine must be running at the determined speed.
See 5.9
Example (Calculating kph)
Distance traveled in 15 seconds = 4.572 m
4.572 m x 0.24 = 1.097 kph
mph kph
PTO Speed
400 rpm 450 rpm 500 rpm 540 rpm
Inch cm Inch cm Inch cm Inch cm
0.10 0.16 0.30 0.77 0.27 0.69 0.24 0.62 0.23 0.57
0.20 0.32 0.61 1.55 0.54 1.37 0.49 1.24 0.45 1.14
0.30 0.48 0.91 2.32 0.81 2.06 0.73 1.85 0.68 1.72
0.40 0.64 1.22 3.09 1.08 2.75 0.97 2.47 0.90 2.29
0.50 0.80 1.52 3.86 1.35 3.43 1.22 3.09 1.13 2.86
0.60 0.97 1.83 4.64 1.62 4.12 1.46 3.71 1.35 3.43
0.70 1.13 2.13 5.41 1.89 4.81 1.70 4.33 1.58 4.01
0.80 1.29 2.43 6.18 2.16 5.50 1.95 4.95 1.80 4.58
0.90 1.45 2.74 6.96 2.43 6.18 2.19 5.56 2.03 5.15
1.00 1.61 3.04 7.73 2.70 6.87 2.43 6.18 2.25 5.72
1.10 1.77 3.35 8.50 2.97 7.56 2.68 6.80 2.48 6.30
1.20 1.93 3.65 9.27 3.25 8.24 2.92 7.42 2.70 6.87
1.30 2.09 3.96 10.05 3.52 8.93 3.16 8.04 2.93 7.44
1.40 2.25 4.26 10.82 3.79 9.62 3.41 8.66 3.16 8.01
1.50 2.41 4.56 11.59 4.06 10.30 3.65 9.27 3.38 8.59
1.60 2.57 4.87 12.36 4.33 10.99 3.89 9.89 3.61 9.16
1.70 2.74 5.17 13.14 4.60 11.68 4.14 10.51 3.83 9.73
1.80 2.90 5.48 13.91 4.87 12.36 4.38 11.13 4.06 10.30
1.90 3.06 5.78 14.68 5.14 13.05 4.62 11.75 4.28 10.88
2.00 3.22 6.08 15.46 5.41 13.74 4.87 12.36 4.51 11.45
2.10 3.38 6.39 16.23 5.68 14.43 5.11 12.98 4.73 12.02