Hillco 3700S, Operator'S Manual, Page: 25 / 40

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MECHANICAL ADJUSTMENTS
TREAD WIDTH
The Model 3700S Leveling System is designed around a main undercarriage length of
2570mm (101.2”), which is identical to the combine’s original axle tube length (The
Tire Selection Chart shown in the Case IH® 5088/6088/7088 Operator’s Manual will
be a correct guide for adjusting tread width). The final drives can be mounted directly
to the undercarriage or the 285mm (11.2”) axle extensions can be used provided the
corresponding length drive shafts are used with the extensions.
The minimum allowable tread width for use with the Model 3700S Leveling System is
132”.
Any tread width narrower than this will not allow the combine to level to
its maximum capabilities.
The 132” tread width can be achieved by mounting the final drives directly to the under
carriage and dishing the stock combine wheels outward. Check the tread width using a
tape measure to insure your machine is not operating on less than the minimum 132”
tread spacing.
When the 285mm (11.2”) extensions are mounted to the Model 3700S under carriage,
the OEM cross support tie rod can not be used. The cross support tie rod is replaced
with two shorter tie rods that are manufactured by Hillco Technologies, Inc.
TIRE SELECTION
Model 3700S Single Tires – Combines equipped with the Model 3700S Leveling
System can be equipped with 30.5LR32 170A8 R1; 800/65R32 172A8 R1W; and
900/60R32 176A8 R1, R1W tires. All other single tire options are not allowable
due to load rating or tire clearance issues.
Model 3700S Dual Tires –
Combines equipped with the Model 3700S Leveling
System can be equipped with 18.4R42 LI 153 R1, R1W; 520/85R38 LI155 R1;
520/85R42 LI157 R1, R1W, R2; dual tires. All other dual tire options are not
allowable due to tire clearance issues.
Model 3700S Steering Tires –
Combines equipped with the Model 3700S Leveling
System must be equipped with 18.4-26, 480/70R30, 540/65R30, or 600/65R28
steer tires for proper rear side panel and return elevator clearance. The
600/65R28 tire has the highest load carrying capacity.