Division IV NATPA Pulling Rules
Effective until 4/2016
Tractors 1957 and older or production models that started in 1957
1. General Rules – See general rules that apply to all tractors.
2. Age: Drivers must be 14 years of age or older. Those under 18 years of age must have written parental/guardian permission.
3. Safety: All tractors must have a working safety kill switch.
4. HITCHES - Minimum 18" back from the center of the rear axle and a maximum of 20" drawbar height. Hitch material cannot be thinner than 3/4" and not thicker than 1.25". Hitch has to have a 3.5" hole with 1" material thickness around the hole or a straight clevis bolted or pinned tightly to the drawbar with a minimum of 3.5" hole. Top of hitch adjuster cannot be above center line of axle or hub. Hitches and drawbars must be stationary in all directions. Hitch must be easily accessible (sled operator's discretion).
5. Weights: Weights must not extend rearward beyond rear tires and cannot be more than 11 feet from the center of the rear axle to the furthest point forward.
6. Tires and Rims: Maximum tire size - 18.4 X 38; any rim width. No radial tires. No steel wheels. Two wheel drive only. No duals. Any cut allowed on tires.
7. RPM's: RPM's allowed will be determined by the NATPA RPM Chart. Any tractor not listed will use manufacturer's data. A 20% margin of error will be permitted. All tractors to have positive throttle stops with a working governor in the stock location.
8. Speed: Any gear, any speed. Shifting of TA's allowed. The marker for Div III speed will also be used as the mark to stop the tractor if driver wishes to restart pull.
9. Tractors manufactured to use diesel fuel only cannot be converted to gas or LP. Tractors must be naturally aspirated. No turbos or blowers - except Oliver 99GM, etc.
10. Tractors must have the stock engine, frames, transmission, rear end and axle housings or manufacturer's replacement for make and model of tractor being pulled . Stock heads and their replacements are to remain unchanged in outside appearance. No 7 bolt main blocks in Oliver's; no (12) port heads; no 99 heads; no 1600 series heads. AC - WC/WD/WD45 can use D-17 engine; IH - H, 350; M, 450. JD - A/B/G can use power blocks. No M-M 800 heads or blocks. Dual exhaust not allowed except after stock manifold.
11. Enhanced electrical systems permitted in all classes. Rev limiters allowed.
12. Any agricultural carburetor allowed. Number of barrels, throats, venture, etc, must be that of the manufacturer for that make and model. Exception: John Deere tractors may run updated (duplex) heads, manifolds and carburetors. Interior enhancement of stock or manufacturer's replacement manifolds permitted.
13. No increased height in any tractors (ie: deck plates, shims, girdles) except for stock gasket.
14. OL 66,Farmall H, AC WC, Ford 800, Cockshut 30 and above and like size tractors are not allowed in classes below 3500#. Massey 33, Oliver 77, JD-A 1939 and down, McCormick 10-20, F-20 and like size tractors are not allowed in classes below 4000#. 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 55, IH W-9, IH WK-40, Case LA, Case 600, Moline GB, Moline GBD, Oliver 99 and all like size tractors are not allowed below 5500#
15. All Div. IV tractors will be equipped with a dead man throttle.
16. All Div. IV tractors must have fenders. Fenders must be as high as the tallest part of the rear tire and must support the weight of the driver. There will be a 50 pound weight allowance for fenders
17. It is recommended that the tractor be equipped with a high back seat. ( Added as per board meeting of 3/29/07 .)
* 3250 This division will consist of the following tractors.
AC-B, AC-C, Case VAC, IHC F-12, IHC F-14, IHC-B, IHC-C, JD-B 1938 Unstyled and Oliver 60.
AC-CA, Cockshutt 20, Ferguson TE-20, Ferguson TO-35, Ford NAA, Ford-600, Intercontinental C-26, IHC Super-C, IHC 200, IHC 230, JD-B Styled, Long A, MH 101-JR, MH-22, MM-R and MM-335