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