Changing Rear Tires

If rear tires have been changed since last successful seeding, main drive clutch sprocket (A) should be inspected to ensure that tooth count agrees with new tire size. Tooth count is stamped into sprocket for easy identification.

NOTE: Chain length may need to be adjusted when sprockets are changed. Add or remove chain links as necessary.

Tire Size/Travel Distance/Sprocket Teeth
Tire Size Travel Distance
mm (in.) per Rev.a		 Tooth Count
18.4-26 R3, 10PR 4191 (165) 57T
18.4-26 R2, 10PR 4394 (173) 62T
23.1-26 R3, 10PR 4521 (178) 62T
28L-26 R3, 12PR 4775 (188) 62T
23.1-26 R2, 10PR 5029 (198) 68T
28L-26 R2, 12PR 5080 (200) 68T
30.5L-32 R3, 12PR 5359 (211) 72T
30.5L-32 R2, 12PR 5664 (223) 80T
710/70R38 R1W, 2 Star 5893 (232) 80T
20.8R-38 R1, 1 Star 5639 (222) 80T
18.4R-46 R1, 3 Star 6020 (237) 80T
20.8R-42 R1, 2 Star 5867 (231) 80T
aTire travel per revolution is estimated.

 
A41558A


A-Main Drive Clutch Sprocket

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IMPORTANT: When tire size changes, tire speed sensor needs to be recalibrated for accurate display of travel speed, area, and application rate.

Refer to Operating the Machine-Monitor Set-up section, for sensor calibration procedure. Travel distance shown above can be entered into the monitor as an initial setting until full calibration procedure can be performed.

NOTE: Base sprocket selection on similar travel distance (inches traveled in one tire revolution) when unlisted tire size is used.

Wheel hub/axle housings (A) are factory attached to agree with original rear tires and may need to be repositioned if new size rear tires are used.

A41849A

Drive Side Shown


A-Wheel Hub/Axle Housings

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Refer to hole pattern diagram and chart to ensure that hub/axle housing-to-frame position is correct for new size tires.

Tire Sizes Use Hole Pattern No.
30.5L-32 R2, 710/70R38, 18.4R-46, 20.8R38 Duals, 20.82-42 1
23.1-26 R2, 28L-26 R2, 30.5L-32 R3 2
23.1-26 R3, 28L-26 R3 3
18.4-26 R2 and R3 4 (195 bu TBHa ONLY)
aTBH = Tow-Behind

 

IMPORTANT: Rear axle mounting bolts must be tightened to 675 N·m (500 lb-ft) or machine damage may occur. This hardware must be kept tightened to the listed specification to prevent machine damage.

Specification

Rear Axle Mounting Bolts -Torque 675 N·m (500 lb-ft)

A41769A

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