Ground Speed Calibration Numbers; Rear Tyre Rolling Circumferences - New Holland T6010 Operator's Manual

SECTION 2 - - CONTROLS, INSTRUMENTS AND OPERATION

Ground Speed Calibration Numbers

The rolling circumference for any given tyre size will
vary depending on tyre manufacturer. The figures
shown in the table are an average based on rolling
circumference data
manufacturers. To obtain an accurate figure for your
rear tyres, consult your authorised dealer or tyre
supplier.
If the size of tyre on your tractor is not listed, then the
road speed calibration may be carried out using one
of the following procedures.
Carry out the Auto calibration as previously
described or measure the rear tyre rolling
circumference.
1. To measure the rolling circumference of the rear
tyre, park the tractor on a level surface and make
a vertical chalk mark on the sidewall where the
tyre tread contacts the ground. Make a second
chalk mark on the ground aligning with the mark
on the tyre.
2. Slowly drive the tractor forward until the rear
wheel has made one revolution and the chalk
mark on the sidewall is again in contact with the
ground. Mark the ground again and measure the
distance between the two chalk marks.
IMPORTANT: If your tractor is equipped with the
optional slip control feature, then the ground speed
displayed is a true speed as sensed by a radar unit,
calibration is therefore not required.
WARNING
The radar ground speed sensor emits a low intensity
microwave signal which will not cause any ill effects
in normal use. Although the signal intensity is low, do
not look directly into the face of the sensor while in
operation so as to avoid eye damage.
supplied by several

Rear Tyre Rolling Circumferences

Tyre Size Tyre Rolling Circumference
Centimetres
18.4R -- 30
12.4 -- 32
16.9R -- 34
18.4R -- 34
13.6R -- 38
16.9R -- 38
18.4R -- 38
20.8R -- 38
18.4R -- 42
14.9R -- 46
480/70R -- 34
520/70R -- 34
480/70R -- 38
540/65R -- 38
520/70R -- 38
600/65R -- 38
650/60R -- 38
650/65R -- 38
580/70R -- 38
320/90R -- 50
Inches
461.2 181.6
406.9 160.2
473.1 186.3
494.7 194.8
465.6 183.3
503.4 198.2
525.6 206.9
549.3 216.3
552.7 217.6
554.2 218.2
474.5 186.8
490.6 193.1
506.5 199.4
501.5 197.4
525.6 206.9
523.7 206.2
510.8 201.1
544.5 214.4
549.7 216.4
560.3 220.6
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