Classes

3,750, 4,500, 5,500, 6,000, 6,500#


Draw Bars

Draw bars must not exceed 18 inches in height or less than 18 inches from center of axle to hooking point.  No part of draw bar may extend rearward beyond point of hook.  Draw bars must be stationary in all directions. No clevis. 


Weights

Weights must not extend rearward beyond rear tires and cannot be more than 11 feet from center of the rear axle to the furthest point forward.  No more than 12 inches from side of rear tire. 


No radial tires, steel wheels, or duals.  Two-wheel drive only.  Top cut only. No cutting of leading edge of the tire bar or casing allowed.  Manufactured data must be intact.  Tire size for 3750 & 4500 class will be a 15.5 X 38 Max.  Tire Size for 5500 & 6500 class will be 16.9 X 34 Max.  Any rim width allowed.  No aluminum rims allowed.

Tires


Gas, diesel or LP fuels only.  No alcohol or nitrous oxide fuels may be used in tractors.  Gas is allowed with a maximum specific gravity of 750.  All tractors are subject to random fuel checks.  Tractors manufactured to use diesel fuel only cannot be converted to gas or LP. 

Fuel


RPMs allowed will be determined by the Nebraska test chart.  Any tractor not listed will use manufacturer’s data.  A 10% margin of error will be permitted. All tractors to have positive throttle stops.  RPMs will be checked randomly after hook. 

RPMs


Any gear, speed limit will be 3.0 mph. No shifting of TAs.  ½ Track Disqualification Rule:  If speeding horn sounds AFTER mid-track (half track) point is reached, puller is disqualified. 

Speed Limit


Replacement carburetors allowed but with no modification of carburetor or manifold.  Overhang of carburetor to manifold is not allowed.  Only stock appearing manifolds are allowed.  Tractors must be naturally aspirated.  No turbos or blowers-except Oliver 99GM, etc.  Enhanced electrical systems permitted in all classes.  NO rev limiters. 

Carburetors


Tractors must have the stock engine or engine must be from original manufacture and bolt in without modification using existing bell housing and motor mounts.  Frames, transmission, rear end and axle housing must be stock or manufacturer’s replacement. Dual exhaust not allowed except after stock manifold. 

ENGINE, FRAMES,

TRANSMISSION,

REAR END, AXLE 


Oliver 88, Farmall M, Massey 44, MM-U, JD G, Case-C/D, JD-A 1940 and up and like size tractors are not allowed in classes below 4500#. Massey 33, Oliver 77, JD-A 1939 and down and like size tractors are not allowed in classes below 4000#. 

Other Restrictions


Wheelie bars and Kill switches (all electric fuel pumps must be wired to kill switch).  Safety equipment may be checked randomly.  All decisions made by rule and tech committee are final. 

Safety Equipment