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Tractor General Rules

Updated: Jan 19

No four-wheel drive model tractor is eligible.

No OEM cast component tractors allowed.

No billet blocks allowed. This rule does not apply to the MOD Tractor class and LLM

Tractor class.

Maximum tire size allowed for competition: 24.5x32. Tread width not to exceed 25

inches.

Maximum tire size allowed for competition: 30.5x32. Tread width not to exceed 31

inches. No radial tires allowed except in small block class and the LLSS class.

If the RRTTPA Board doubts the legality of any entry, or upon protest of another

contestant in that class, the contestant in question must verify that 150 units of the

tractor in question must have been manufactured (notarized statement from the

manufacturer) will furnish part numbers and prove to the board’s satisfaction that

the tractor is a legal entry.

Drawbar

1) Minimum drawbar length is 18 inches from center of rear axle with a maximum

height of 20 inches, rigid in all directions. Drawbar maximum of 10 degrees.

2) Pulling point must be within one (1) and 1 1/2 inches from back edge of hitch and

no less than 3/4 inches.

Safety

1) A safety secondary hitch must be mounted horizontally on the vehicle 12 inches

below the drawbar, to be painted white.

2) Must have wheelie bars capable of supporting the weight of the tractor. Must

have front skid plates. 3) Safety roll cage is mandatory as described below:

3) Roll cage mounting to OEM rear end housing:

a) Roll cage must be attached to any tractor utilizing a stock, OEM rear end housing

by the use of flanges constructed to form a one (1) piece, 90-degree angle of steel.

Flanges to be created from 1/4-inch minimum thickness steel with a minimum of 2

1/2-inch-wide horizontal flange and a three (3) inch wide vertical flange. Angle iron is

permissible. Attachment flanges must be secured to axle housings by at least four (4)

axle-housing bolts, with a minimum of 1/2-inch diameter, at least grade #8 or better.

Two (2) additional bolts must be installed through vertical flange, one (1) before and

one (1) after axle housing. Both end attachment bolts must be located within four (4)

inches of each end of vertical flange or by two (2) axle housing bolts and two (2) bolts

before and two (2) bolts after axle housing.

b) Both side flange assemblies must be connected by a rear attachment flange across

back of rear end housing, made to at least minimum dimensions of side flanges.

When connected, the side and rear attachment flanges will create a “U” shaped

configuration. Rear attachment flange must be constructed to attach to

any two (2) horizontal threaded holes in axle housing that are 1/2 inch in diameter or

larger.

c) The “U” shaped attachment flange assembly must be connected by a 1/4-inch

steel strap positioned horizontal over the top of the rear end housing side to side at

the front and middle of the “U” shaped structure. The strap should be welded solid to

the side and rear vertical flanges to create a rigid, one-piece assembly. For maximum

strength, raise the attachment flanges high enough to avoid welding horizontal plate

to radius of bend or angle of attachment flange. Seat may be mounted to the

horizontal plate.

d) Support webs of 1/4-inch minimum thickness steel a minimum height of six (6)

inches vertical from the base plate must be welded between vertical tubes on both

side and rear tubes.

4) Roll cage mounting to Tube Type Chassis

a) Vertical roll cage supports to be welded directly to horizontal tube frame structure.

When this method is used, steel supports must be installed directly below horizontal

frame tube and in-line with each vertical roll cage tube. Steel supports must extend

to the next horizontal frame tube directly below. The steel supports must be a

minimum of 1⁄4 inch X three (3) inches in dimension. Rear roll cage vertical tubes must

be welded directly to a rear structure same as the side frame structure. The rear

frame structure must be attached to the vehicle frame structure and must be

supported directly below both rear vertical roll cage tubes and the same as side

frame structure.

b) Support webs of 1/4-inch minimum thickness steel and a minimum height of six (6)

inches vertical from the base plate must be welded between vertical tubes on both

side and rear tubes.

5) Roll cage mounting to channel type chassis

a) Vertical roll cage supports to be welded to a single piece of 1/4-inch minimum

thickness steel with a minimum of 2 1/2 inches wide horizontal flange and a three (3)

inch wide vertical flange. Angle iron is permissible. Attachment flanges must be

secured to vertical side of frame by at least five (5), 5/8-inch, grade #8 or better

bolts. Rear roll cage attaching tubes to be welded to a 1/4-inch minimum thickness

steel flange made to at least the minimum dimensions of side flanges. The rear

mounting flange to be attached by welding the side mounting flanges or vehicle

frame rails. Rear mounting flange must be supported directly below both rear

vertical roll cage tubes. Supports to be made from a minimum 1/4-inch steel welded

to rear end housing or vehicle frame structure or bolted with a minimum of two (2),

1/2-inch, grade #8 or better bolts.

b. Support webs of 1/4-inch minimum thickness steel and a minimum height of six (6)

inches vertical from base plate must be welded between vertical tubes on both sides

and rear tubes.

6) Tractors are required to have a SFI spec. 6.2 bellhousing or a SFI spec. 4.2 bell

housing blanket that meets the following minimum construction specification: You

cannot have visible holes in clutch housing to clear bellhousing.

a) 17 inches wide and long enough to wrap around the bell housing with at least a

six (6) inch overlap.

b) Secured with six (6) two (2) inch wide nylon web straps with a steel D-ring on one

end and sewn the length of the blanket (except for the overlap area) and to be tied in

a saddle cinch.

c) Four (4) two (2) inch nylon web retaining straps each at the front and back of the

blanket.

d) Must be in good condition and be within 5-year certification. Tag must be legible.

7) Tractor airbag suspensions allowed, but no on-board compressors or controls of

any kind to change the suspension. Only one fill point allowed for suspension.

8) Tractors must have either:

a. Safety tie bars mounted to rear axle housing with at least four (4) axle housing

bolts and extending forward of flywheel area and fastened to side of block or main

frame with at least two (2) 5/8-inch bolts; OR

b. A one (1) piece frame extending from front of tractor to rear axle housing

mounting bolts.

9) Tractor utilizing on board fire extinguishing systems inside the engine

compartment. Not to be attached to the sheet metal.

NOTE: Tie bars of frame must be of sufficient strength to support weight of tractor

with the bolts used to split the tractor removed. If in question, to be approved by the

RRTTPA Board.

Chassis/Shielding

1) Must have fenders or shield between driver and rear tires.

2) Tractors must have hood and grill in place as intended by manufacturer.

3) Sheet metal can be upgraded to present manufacturer upon approval from the

RRTTPA Board.

4) Sheet metal upgrade cannot cross original manufacturer’s line. For example, Case

IH to IH or Oliver to Minneapolis Moline acceptable. IH to John Deere not acceptable.

5) Sheet metal to be stock length and in stock location.

6) Tractors must retain stock appearance.

7) The distance from the center of the rear axle to the part of the hood that is

farthest forward must be the same length of that model of the upgraded sheet

metal.

8) Maximum of 114 inches’ wheelbase unless originally produced with longer

wheelbase, in which case stock length must remain. Maximum length of 13 feet from

center of rear wheel to forward most portions.

9) Tractor inner side shields for year 2020. All inline engines are required to have an

additional side shield consisting of .125 (1/8) steel or titanium or .250 (1/4) inch thick

aluminum inside of the current .060-inch steel or aluminum side shields with a

minimum of 1⁄2 inch air gap. The shield is independent of the current side shield and

must be attached to the chassis (frame) with a minimum of 5/16 fastener at both

ends and the center on the bottom or suspended a minimum of 3 inches below the

top of the frame rail and to the engine block at both ends bolted solid to the bolt if

suspended or with a length of 5/16 chain if fastened at bottom at deck height on the

top. This shield must extend from the bottom of the head to the centerline of the

crankshaft and extend the full length of the block on each side of the engine. Rear

axles must remain in OEM position.

10) Allis Chambers may run Detroit series 40 or IH DT 466

NOTE: The criteria used by the board will be the retention of stock appearance. The

chassis and frame must remain stock from the rear of the engine block to the rear of

the tractor (Oliver/Cockshutt is allowed to remove the cast iron tub, as long as the

rear of engine is securely mounted at/near the bell housing).

Transmission/Clutch/Rear End

1) Only mechanically activated clutches are permitted.

2) Neutral safety switches are to be in or on the transmission

3) The stock transmission housing or manufacturer’s replacement and the stock final

drive housing or manufactures replacement.

4) The clutch housing, transmission case, rear end housing and axle housing must be

OEM with no aluminum replacements.

5) Any cast chassis must have all OEM bolts in place.

6) May cut hole for mounting aftermarket transmission, reverser or drop box.

NOTE: Planetaries are considered part of the final drive and are not removable.

Fuel & Water

1) For year 2020, VP Fuel and water is recommended for all vehicles.

2) For year 2020, alcohol tractors, with hoods, recommend having halon fire systems

with at least 3 nozzles under the hood .

Turbo

1) Turbocharger engines are required to have one cable that must surround the

engine block and head. This cable must be placed between the first and second

cylinder through exhaust manifold port area.

a) Cable must be a minimum of 3/8-inch thickness.

b) Cable must have a minimum of four (4) clamps at the splice.

c) Cable must have approximately four (4) inches of slack.

d) Suggest that cable ends be lapped back around and clamped with an additional

clamp to prevent main clamps from coming off.

2) No titanium wheels in any turbo chargers allowed in any class.

Engine

1) Engine block must remain in original location as located by the manufacturer.

2) All engines must be secured and held rigid to OEM chassis. Engine cannot move

independent of the rear-end/transmission housing.

3) Must use OEM engine block for that matches that OEM chassis.

Frame

1) Allow tractors with cast tub (belly) type frame (i.e. Oliver, Cockshutt, White) to

remove complete frame from front of transmission housing. Engine and clutch

housing to remain in original location and mounted solid as intended by

manufacturer.

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