Note: The following rules and/or recommended practices apply to traveling weight box type machines only. Rule changes for this printing of the rule book are indicated in the text. All new rule changes go into effect January 1st of each year unless safety forces the board to implement immediately.
Section 1 — Membership
1.1New membership fees will be $500 for class 1 thru 4 sleds and $1,000.00 for class 5 thru 8 sleds. Fees are payable over two years with first half of fee due upon application for membership. Second half of fee due upon start of second year of membership.
1.2Members without an active sled will be assessed an annual membership maintenance fee of $50.
1.3If membership is not maintained, the new member fee will be assessed.
1.4As per By Laws: Article II Section 4. Termination of Membership. The board of directors by affirmative vote of two-thirds of all of the members of the board may suspend or expel a member for cause after an appropriate hearing, and may, by a majority vote of those present at any regularly constituted meeting, terminate the membership of any member who becomes ineligible for membership, or suspend or expel any member who shall be in default in the payment of dues for the period fixed in Article XI of these by-laws.
1.5As per By Laws: Article XI Section 3 Default or termination of membership. When any member of any class shall be in default in the payment of dues for a period of six months from the beginning of the period for which such dues became payable, his membership may thereupon be terminated by the board of directors in the manner provided in Article XI of these by-laws. (Payment must be made by May 1st)
1.6As per By Laws: Article II Section 7 Transfer of Membership. Membership in this corporation is not transferable or assignable.
Section 2 — Licensing Procedures
2.1All insurance and license fees are due yearly. Insurance and license on any weight transfer machine is only valid when all the requirements and procedures are completed and current year license with number is physically attached to weight transfer machine.
2.2All weight transfer machines must be inspected yearly. NASOA allows a 90-day grace period from prior year's inspection to fit both yours and the inspector's schedules for yearly inspection.
2.3After inspection, correct all areas noted and starred (*). Notify NASOA secretary and inspector by signed letter all areas have been corrected. Make sure you have paid yearly license fee to NASOA secretary. After which the secretary will forward you a copy of your license.
2.4Any machine owner notifying NASOA that all changes and/or corrections have been made, when in fact they have not, will be subject to a 1-year suspension of license and up to a $500 reinstatement charge.
2.5License fees and insurance fees are due on a calendar year basis. Your re-inspection date is your own and may not coincide with calendar year.
2.6The NASOA inspector has the right to refuse approval for machine license and/or suspend a license with just cause. Machine owner may correct deficiencies and/or appeal to NASOA for a hearing decision from the NASOA board. If continual breakdown occurs on a machine, it will be re-inspected at the discretion of the NASOA Board. Corrections will be made or license shall be revoked. If for any reason machine must be re-inspected by direction of NASOA, all cost incurred will be at the machine owner's expense.
Section 3 — Inspection Fees and Insurance
3.1
Inspection Fees are as follows:
- $500.00 if paid in person or postmarked on or before February 1 of current year.
- $600.00 if paid in person or postmarked from February 2 thru March 1 of current year.
- $650.00 if paid in person or postmarked from March 2 thru April 1 of current year.
- $700.00 if paid in person or postmarked April 2 or later of current year.
3.1ADefault of inspection fee payment. See Rule 1.5.
3.2NASOA licensing is dependent upon NASOA inspection.
3.3Insurance coverage through NASOA is dependent upon NASOA licensing. All WPI/NASOA combination or NASOA only sleds, must be members in good standing and all fees must be paid for appropriate organizations before an insurance certificate will be issued.
3.4All Inspection Fees and Insurance premiums must be paid before sled license will be issued.
3.4ANo sled inspection/license sticker will be issued for any sleds that do not purchase NASOA/K&K insurance until the following conditions are met.
3.4A1 — A copy of the sled owner's liability insurance certificate from another company must be on file with the secretary.
3.4A1.1 — Insurance certificate must list North American Sled Operators Association (NASOA) as additional insured.
3.4BFailure to meet these conditions by May 1st of said year, or members first event of said year, whichever is earlier, will result in revocation of NASOA membership.
3.4B1 — Once membership has been revoked, a new initiation fee and inspection fee per sled will be required to remain/renew a membership with NASOA.
3.4B2 — Initiation fee and Inspection fee for a revoked membership is to be paid in full. Revoked member must then be in good standing before a sled license and an insurance certificate will be issued.
3.5Any sled pulling a vehicle that is classified above what the sled is classified for does so without insurance coverage.
Section 4 — Voting
4.1Voting members of NASOA will be limited to current licensed sleds.
4.2One vote per sled. All sleds will have the right to vote by proxy.
Section 5 — General
5.1All new rule changes will go into effect January 1st of each year unless safety forces the board to implement immediately.
5.2All sled operators must be at least 16 years of age with parental consent. All crew members must be at least 14 years of age with parental consent.
5.3The sled owner is responsible for adequately training new sled operators. The sled board and sled inspectors can offer training suggestions.
5.4A qualified operator must be in control of the weight transfer machine at all times.
5.5All operators must be in a securely mounted seat.
5.6All operator compartments must be located on the top, rear of transfer (except pre-approved sleds can have operator forward). It is highly recommended that all sled operators wear a seatbelt while seated in the operator compartment.
5.7No riders are permitted in any part of the weight transfer machine at anytime, unless machine has more than one seat in operator compartment. Then, any rider must ride for the duration of class being pulled.
5.8All controls should be convenient to the operator.
5.9Minimum of two (2) fire extinguishers, one (1) on each side. These must be a minimum of 2½ pound ABC type. 5 pound and larger ABC type, or Stop Fyre type is recommended. Dust covers for all fire extinguishers are recommended. Fire extinguishers must be in working condition.
5.10Non self propelled weight transfer machines must have tow back device.
5.11A red light must be clearly visible to track official above pulling vehicle, 4-inch minimum diameter or equivalent, either flashing or revolving, to be wired so red light appears when any brake is activated. Any time the red light appears the green light must go out. Must be a non-see through light.
5.12A green or yellow light must be clearly visible to track officials above pulling vehicle, 4-inch minimum diameter or equivalent. To be wired so green or yellow light appears only when both the weight transfer machine and operator are ready for pulling attempt. (track maintenance equipment out of harms way, box drive mechanism and clutch engagement, brakes released, operator in seat) The green or yellow light must remain on when box is fully forward, not to go red. Must be a non-see through light.
5.13Downhill weight transfer machines can use friction limiting device (clutch) if drilled and tie wrapped.
5.14When a weight transfer machine is at the starting line and the operator is not seated, the clutch on the driving mechanism and ground wheel brakes must be applied.
5.15Should loss of air occur, box clutch must stay locked in and all maxi brake systems must activate.
5.15AAll air applied box clutches must have air supply with check valve to prevent disengagement of box clutch should air pressure be lost.
5.16All tires on all sizes of the sleds should be as large as possible so weight per square inch on ground contact patch can be the least possible. Dual wheels or super singles are highly recommended for sleds.
5.17It is highly recommended that all weight transfer machines be tested before the start of the event.
5.18Workable windshield required.
5.19All sleds should use tandem axles, but this is not mandatory.
5.20All weight transfer machines must have emergency pan drop with option of emergency push down pre box trip (either air or hydraulic). Mechanical push down not to be affected. If emergency trip is used, red light must come on.
5.21All weight transfer machines using some type of push down device on pan rear and underside of sled rail at far end of track will be limited as to how far it can push rear of pan (or lift frame rails).
5.22The device used to activate push down system must be located within the last 24 inches of box travel.
5.23All sleds must have a pull chain hook equipped with an anti-unhooking device.
5.23ASpecial anti-unhooking device at tip of hook on Herc Alloy 100 hooks to be measured as per Diagram 5.23A.1.
5.23BClass 1 and 2 sled pull chain hooks must use a fully enclosed mouse trap style or locking style safety hook. Refer to rule 14.2 for chain specs.
5.23CClass 3, 4 and 5 sled pull chain hooks must use the following:
5.23C1 Minis — Must use a fully enclosed mouse trap style or locking style safety hook. Refer to rule 15.2A and 16.2A for chain specs.
5.23C2 Trucks and Tractors — Must use a fully enclosed mouse trap style or locking style safety hook. Also allowed is a regular sling style hook with a special anti-unhooking device on them ½ inch thick, 3⅜ to 3½ inches high and 2 inches long. Refer to rule 15.2B and 16.2B for chain specs.
5.23DClass 6 and 7 sled pull chain hooks must have a special anti-unhooking device on them ½ inch thick, 3⅜ to 3½ high and 2 inch long. Also allowed is a fully enclosed mouse trap style or locking style safety hook. Refer to rule 17.2 and 18.2 for chain specs.
5.23EClass 8 sled pull chain hooks must have a special anti-unhooking device on them ½ inch thick, 3⅜ to 3½ inches high and 2 inches long. Also allowed is a fully enclosed mouse trap style or locking style safety hook. Refer to rule 19.2 for chain specs.
5.23FAll NTPA certified sleds with Anti Unhooking device at tip of hook will be measured at no more than 3/8 inch smaller than the pulling vehicle drawbar hole.
5.23GA triangle shaped special anti-unhooking device will be acceptable for all classes that require this device.
5.23G1 — The highest point of said device must be facing away from the tip of the hook.
5.23G2 — All other dimensions to remain the same as per the requirements for each class of sled.
5.24Sled Owner/Operator/Crew Conduct:
5.24AThe use of alcohol or any other intoxicating substance is strictly prohibited for any Sled owner/operator or crew member. Zero Tolerance.
5.24A1 — First offense: loss of license and insurance for one year and ten days.
5.24A2 — A reinstatement fee of $1,000.00 will be required.
5.24A3 — A probation period of one year and ten days will be instated. Any offense while under probation will result in lifetime ban.
5.24BAny Sled Owner/Operator or member of his crew who exhibits unprofessional and/or unsportsmanlike conduct including abusive language and/or physical action toward the promoter, event official, or spectator and/or deliberate delay of event, will be just cause for disciplinary action from the NASOA board.
5.24B1 — First offense $500.00 fine.
5.24B2 — Second offense $1,000.00 fine.
5.24B3 — Third offense loss of license.
5.24CAny unsafe operation of the sled either on or off the track will be just cause for disciplinary action from the NASOA board.
5.24C1 — No cell phone use is permitted while the sled is in motion.
5.24C1.1 — First offense $500.00 fine. 5.24C1.2 — Second offense $1,000.00 fine. 5.24C1.3 — Third offense loss of license.
5.24C2 — The use of hand held or remotely operated video equipment is not permitted by the operator.
5.24C2.1 — First offense $500.00 fine. 5.24C2.2 — Second offense $1,000.00 fine. 5.24C2.3 — Third offense loss of license.
5.24DDisciplinary action from the NASOA board may be or include probation, suspensions or fines. (Action shall be determined by Appeals Board)
5.24D1 — The Board reserves the right for egregious violations to move directly to loss of license.
5.25Sled Caused Accidents:
5.25ASled Operator will be required to file an incident report with our insurer after an accident involving:
5.25A1 — Injury to the sled operator, competitor, track personnel, or spectators.
5.25A2 — Damage to the competition vehicle or property damage.
5.25A3 — If incident report is not filed within 10 business days a $500 fine will be assessed.
5.25BIn the event of a sled accident resulting in major damage to the sled, the sled will remain out of service until:
5.25B1.1 — Accident has been investigated by a NASOA approved inspector.
5.25B1.2 — Sled has been repaired.
5.25B1.3 — A re-inspection of the sled has been completed by a NASOA approved inspector.
5.25B2 — All costs for sled re-inspection incurred by the sled inspector are required to be paid by the sled owner.
5.26NASOA recommends that for safety reasons, all semi hitches have a drawbar height of no more than 18 inches.
Section 6 — Rail
6.1Rail strength must be adequate enough so that there are no distortions at weight transfer machine's heaviest weight and stress load.
6.2Rail length should be enough so the box can go past fifth wheel pin in front and behind rear axle. The further the box can go past either fifth wheel pin or behind rear axles, the more options there are available to the weight transfer machine operator.
6.3Rails must have two sets of stops, independent of each other, on the front of rails. They must also be at adequate height for the application, each strong enough to stop a fully loaded, freewheeling box at not less than 10 mph.
6.4Stop on rear of rails are to be strong enough to stop a fully loaded box free-wheeling going backwards.
Section 7 — Axles
7.1Axles should have the ability to be raised or lowered in relation to the rails to be able to lighten or make the pan heavier according to the class being pulled. All walking axles, and/or independently controlled by hydraulic or air bag suspension devices axles, are to be held or mechanically locked in that position for duration of that class.
7.2A weight transfer machine desiring to release (raise) one axle while traveling down the track must adhere to the following criteria: one axle must remain in that fixed position. If the drive axle (box drive) is to be released (raised), the exhausting trigger on either air or hydraulic mechanism is to be controlled by box travel on rail for all contestants. Axles being so wheels can never slip or skid. This down pressure will carry from sled to sled because of different rail angles. This axle must be recycled for next attempt so axle is the exact same distance from rail for all contestants at the starting line. If axle to be released is not a drive axle, it must still be released by box travel, but can be completely lifted off the ground if so desired. Axle must be recalled to exactly the same distance from rail for all attempts in given class.
7.3All weight transfer machines that have capability to change axle pivot will have drive axle locked in vertical position for entire class being pulled. Rear axles drive sleds must lift the front axle off the ground prior to 1/3 of the box travel.
Section 8 — Brakes
8.1All weight transfer machines must have brakes that pass D.O.T inspection.
8.2All ground contact wheels at the starting line must have working brakes installed with brakes being strong enough to lock all wheels when unit is fully loaded.
8.3All weight transfer machines using air brakes must have maxi brakes on drive axles.
8.4All sleds must be equipped with a braking system on the box itself, capable of stopping box travel at maximum box weight.
8.5Box drive train must have a brake system built in it somewhere. (Preferably on the box chain shafts at either end of the weight transfer machine)
8.6Box brakes utilizing idler chains with their own shafts, bearings, and brakes can be used by Class 5 sleds or smaller by January 1, 2015.
Section 9 — Kill Switches
9.1Kill switch cable required from front of WTM mainframe to competition vehicle kill switch. Kill switch cable must be operable at any time a competition vehicle is connected by chain to weight transfer machine.
9.2Cable to be a minimum 1/8" diameter, plastic coated steel cable. Kill switch cable must be capable of minimum 32 pounds of tension (pull). Kill cable must be long enough to reach minimum 6 inches beyond point of hook when chain is hooked into drawbar and tight.
9.3A solid latch with a minimum 3/16-inch cross-section thickness at any point should be used to connect cable to kill switch ring. Latch must be attached to cable at least two (2) cable clamps.
9.4Kill switch cable must be connected to an electric motor or winch type device mounted at front of weight transfer machine main frame that actuates quick and positive. Device must be capable of adjusting cable length to limit excessive slack in kill switch cable. Control of this device must be from operator's station. Manual operation of the kill switch cable by operator is not allowed. All kill switch devices must be able to retract cable past buckboard of pan.
Section 10 — Pans
10.1All pans on all weight transfer machines are to be rounded or beveled on front-bottom of the pan. This is to prevent tire climbing and to better feed dirt under the pan, not just push dirt in front of the pan.
10.2All pans must be equipped with a buckboard 36 inches or higher on class 6, 7 & 8 sleds. On class 1 thru 5 sleds the buckboard must be 24 inches or higher. A horizontal 4-inch belt flap at top of buckboard required. Buckboard must have adequate opening in center for hooking and unhooking all sleds.
10.3All pans must be equipped with dirt shields (mud flaps) attached near the front of the pan. Dirt shields must be 1-inch thick rubber or framed with steel if less than 1-inch thick. They cannot be further back than 12 inches from the front of the pan, extending outward at a 45-degree angle. They should be forward to an overall width of 13 feet on class 6, 7 & 8 and 10 feet on class 1 thru 5 measured from end of flap on one side to end of flap on the other side. Dirt shields must stay in contact with the ground to keep dirt from escaping under shield.
10.4Narrower dirt shields can be used indoors only when room demands.
10.5The point of hook of the weight transfer machine frame to the pan or skid (fifth wheel pin and plate) will be center to rear of center or center of pan. It cannot be in front half of pan. Pin location should not be too far back in pan. Fifth wheel plate and pin must be taken apart and visually inspected yearly. If there is too much horizontal or vertical slack in fifth wheel pin or latch, they must be replaced, NEVER WELDED.
10.5AAny 5th wheel that is not used to uncouple pan for transport must be reversed.
10.5BAny 5th wheel mounted forward to uncouple pan for transport must use locking bar type 5th wheel.
10.5CAny sled built after January 1, 2013 may not use a 5th wheel on the pan.
10.6The pan on all sleds must be constructed rigidly. Flexing in any direction is prohibited.
10.7Pan dimensions on all weight transfer machines should be approximately the length and width dimensions of any vehicle that pulls the machine.
10.8The pan on all weight transfer machines may be able to pivot from side to side.
10.9Pan drawbar must be as strong as drawbars on vehicles to pull. Example: Class 8 sled minimum of three square inches of steel at all points including any pinhole with pin removed.
10.10Sled drawbar (pull) chain and hook shall consist of a single chain and a single hook. The chain will be attached to a drawbar that is centered in the front of the pan. The drawbar must be a minimum of one inch above ground and a maximum of two inches above ground on all sleds.
10.11Chain length is measured from center of sled drawbar pinhole to inside of hook when tight in a vehicle drawbar.
10.12On non-sanctioned classes, chain length can be as needed as long as it meets chain load specifications for sled classification.
10.12AAll chain extensions must have a positive attachment to the main hook chain or the pan. Examples: (Hammerlock or Safety Hook)
10.13On sleds required to have a second chain it will be ¾ inch grade 8 chain, and be attached 10 inches above the main hook point. Secondary chain must exceed main hook chain by a minimum of 6 inches and a maximum of 10 inches.
10.14Any air hold system must operate at full air pressure of total machine triggering device to be same as hydraulic device. All pan hold up devices with electric or air must be held up with electric power (or air) where the loss of either will let the pan drop.
10.15Bars are allowed under pan, but only in rear half of pan. No bars are to be used under front half of pan.
10.16All pans must be designed to maintain ground attitude to prevent bouncing.
10.17Any weight transfer machine using a rear pan lift device at starting line must observe the following:
10.17A — Mechanical: single arm (mouse trap) multiple arms progressive (ladder) pan will always drop right and fair. Can be engine driven if not used as push down.
10.17B — Hydraulic: can be 12-volt hydraulic pump, engine driven or ground driven constant displacement pump.
10.17C — Pan Drop trip must be located outside of the cab and on the box rail. Trip must be activated by box travel.
10.18All pans shall be able to pivot up and down. Any ground attitude device must not limit the pan's pivot ability or steer ability after pan holdup device has been released.
10.19All pans must have the ability to mount a prism directly over the chain hook point for events requiring this type of laser measurement.
Section 11 — Box Drive Train
11.1The weight transfer machine must be positive ground drive (on front axle of tandems on new or future sleds — January 1, 2005) mechanism through shafts, gears, chains, sprockets, and gear boxes. The use of over-running, sprag-dog clutches is not allowed anywhere in the drive train. Any clutch on any weight transfer machine that is not normally an engaged clutch (spring loaded or over center) must be air or air over hydraulic engaged. Weight transfer machines should always use normally engaged or over center clutch. Weight transfer machines should always be constructed using shaft and gearbox drives to eliminate slack in chain and sprockets.
11.2Cable drive boxes are limited to Class 4 and below. Cable drive sled will be limited to 7 mph. Weight transfer machines built after January 1, 2005 must be constructed using shaft, gear box and chain and sprocket box drive lines.
11.3Box Transmission gear change must not be possible from a seated position in the cab. Recommended that gear changes be done from outside of the cab.
11.3AClass 1 and 2 Garden tractor sleds may change gears from a seated position as required, but levers must be located in plain view of all participants.
Section 12 — Box and Weights
12.1The size and shape of box and its weights will determine all areas lengths and pivot points.
12.2All weight boxes on all weight transfer machines should be as wide as the tire width of the weight transfer machine in order to gain the maximum rails. This means weights are to be loaded vertical, crossways, containerized and concentrated. All weight transfer machine weights must be a minimum of 300 lbs per cubic foot or weight transfer machine's performance will be severely limited, which will limit weight transfer machine's license. Approximate weights: solid steel 480 lb/ft³, cast iron 450 lb/ft³, lead 706 lb/ft³, cement 150 lb/ft³, water at 39.1° 62.5 lb/ft³.
12.2AAll lead weights must be encased.
12.3All weights must be secured from movement in any direction. Weights must be either compartmentalized or pinned.
12.4On all weight transfer machines all boxes must be welded to its wheel or trolley system so trolley box cannot jump off rails.
12.5Weight transfer machines built after January 1, 2005 must be built with the wheels between top and bottom rail flanges inside or outside of rails.
12.6If box and trolley ride on top of rails, it must have two hold downs one on each rail fastened to the box for the full length of the box. These hold downs must be constructed of material equal to or greater than flange thickness. Sleds using hold down clips must have two (2) gussets per side equal to or greater than the hold down thickness and must be welded. So trolley and box cannot jump off rails.
12.7Maximum clearance between hold-downs of top trolley system and rail flanges is ½ inch.
Section 13 — Classifications
All transfer machines will be inspected and licensed not only for legality, but also for machine's abilities, and crew's willingness to perform. After inspection weight transfer machines will be given one of the eight (8) classifications below. A weight transfer machine will be licensed only for classes and levels of competition it can satisfactorily perform.
| Class |
Eligible Vehicle Types |
| Class 1 | Garden Tractors |
| Class 2 | N/A Mini |
| Class 3 | Blown Mini & Antique Tractors |
| Class 4 | Farm up to 10,000 • Street Stock Gas FWD Pick-Up • Street Stock Diesel FWD Pick-Up |
| Class 5 | Farm Stock up to 20,000 • Pro Farm Tractors up to 6,500 • Single Engine N/A Economy Modified Tractors • Pro Stock FWD Pick-up with Street Tires • Chipped Diesel Pick-Up with Street Tires |
| Class 6 | Super Farm Tractors • Street Licensed Stock Semis • Super Stock FWD • TWD Trucks N/A • Open Diesel FWD Pick-Up • Blown FWD Pick-Up • Single Engine Blown Modified Tractors • Multiple Two & Three N/A Modified Tractors • Pro Farm Tractors • Pro Stock FWD Pick-up • Light Limited Pro-Stock Tractors • Pro Diesel FWD Pick-Up |
| Class 6R | Restricted — Restricted from pulling competition classes of sled class 6: Super Farm Tractors • Street Licensed Stock Semis • Open Diesel FWD Pick-Up • Pro Diesel FWD Pick-Up • Pro Farm Tractors • Light Limited Pro Stock Tractors |
| Class 7 | Multiple Engine Aircraft, Industrial & Marine Modified Tractors • Two & Three Engine Modified Tractors • Super Stock Tractors • TWD Trucks Blown |
| Class 8 | Unlimited Modified Tractors • Four Engine Modified Tractors • Super Semis • Pro Stock Semis with Single Turbo • Pro Stock Tractors |
Section 14 — General Guidelines for Class 1 & 2 Sleds
14.1Weight transfer machines must be capable of transferring 300% of class weight.
14.2Hook chain and all attachments must be minimum 3/8-inch (or greater) grade 80 (or greater) chain with a swivel on the hook end. Chain to 36 inches (±½ inch) long (including hook). Hook used must meet or exceed chain rated capacity and be able to fit through a 1¾ inch minimum drawbar opening. Refer to rule 5.23B for pull chain hook anti-unhooking spec.
14.3Must have steer chains from pan and buckboard to pull chain, 9 inches (±½ inch) on each side of pan draw point. Steer chains to tie into main pull chain 13½ inches – 14½ inches ahead of the first pivot point. These 5/16 inch grade 8 (or greater) chains are to be securely clamped or bolted to main chain (not welded). Steer chains should pull taut when competition vehicle has veered approximately 15 degrees from in-line relation to sled.
14.4Kingpin for garden weight transfer machines must be 2-inch minimum kingpin. No trailer balls. Side pin size 1-inch minimum with minimum two shear points per side.
14.5Garden tractor sled may have pans that swivel 0 to 10 degrees.
14.6Brake controls do not need to be air or air-over hydraulic, but must be hydraulic and be positive type (like a park over center or ratcheting type emergency brake).
14.7Box Drive chain: minimum size 60 • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 8,500 lbs • American Made or American Assembled preferred • must be attached to box with adequate attachments.
Section 15 — General Guidelines for Class 3 & 4 Sleds
15.1Must be able to transfer 300% of class weight being pulled.
15.2AMinis: Hook chain and all attachments must be minimum ½ inch grade 80, length to be 36 in. (±½ inch) with all hooks, connectors & chain. Refer to rule 5.23C1 for pull chain hook anti-unhooking spec.
15.2BTractors and Trucks: Hook chain and all attachments must be minimum ¾ inch grade 80, length to be 46 inches (±½ inch) with all hooks, connectors & chain. Refer to rule 5.23C2 for pull chain hook anti-unhooking spec.
15.3Chains attached to pan and buckboard to be 9 inches (±¾ inch) on each side of pan drawbar. Chain to tie into main pull chain 13½ inches – 14½ inches ahead of first pivot point (pin or hammer link). Clamp to or bolt through main chain. Do not heat or weld to or on main chain. Steer chains to be 3/8-inch grade 8 chains (or next size larger) for normal duty chain. When main pull chain extended forward tight and straight ahead, both steer chains should be snug (not loose or not tight).
15.4King pin must be minimum of 2 inches, no trailer balls, side pins 1¼ inch minimum with 2 shear points per side.
15.5Pan may pivot 0 to 10 degrees.
15.6Brakes: Controls do not need to be air or air-over hydraulic, but must be hydraulic and positive type. Drive train brakes must be a positive type so when activated brakes will stay in that position by itself, until manually released. Drive system brake must be strong enough to stop fully loaded box in a runaway situation.
15.7Box Drive chain: minimum size two single 80H or one double 80H • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 14,500 lbs single or 29,000 lbs double • American Made or American Assembled preferred.
15.8Pan drawbar minimum 1-inch x 2-inch steel with all pins minimum of 7/8 inch.
Section 16 — General Guidelines for Class 5 Sleds
16.1Must be able to transfer 400% of class weight being pulled.
16.2AMinis: Hook chain and all attachments must be minimum ½ inch grade 80, length to be 36 in. (±½ inch). Refer to rule 5.23C1 for pull chain hook anti-unhooking spec.
16.2BTractors and Trucks: Hook chain and all attachments must be minimum ¾ inch grade 80, length to be 46 inches (±½ inch). Refer to rule 5.23C2 for pull chain hook anti-unhooking spec.
16.3Steer chains per 15.3 above. Pan can pivot 0 to 10 degrees.
16.6Drive train brakes must be a positive type so when activated brakes will stay in that position by itself, until manually released. Drive system brake must be strong enough to stop fully loaded box in a runaway situation.
16.7Box Drive chain: minimum size two single 80H or one double 80H • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 14,500 lbs single or 29,000 lbs double • American Made or American Assembled preferred.
Section 17 — General Guidelines for Class 6 Sleds
17.1Must be able to transfer 400% of class weight being pulled. Semi will be 200%.
17.2Hook chain is 46 inches long (±½ inch) with all hooks. Chain and all attachments are to be a minimum of 7/8-inch grade 80. Refer to rule 5.23D for pull chain hook anti-unhooking spec.
17.3Chains attached to pan and buckboard to be 12 inches (±¾ inch) on each side to pan drawbar at the same height from ground as pan drawbar. Chains to tie into main pull chain 17 or 18 inches ahead of first pivot point (hammer link) clamp to main chain. Do not heat or weld to or on main chain. Steer chains to ½ inch grade 8 chain or next size larger. Both steer chains should be snug when main chain is extended tight and straight ahead.
17.4King pin minimum 2 15/16 inch. Side pins minimum 2 inch with a minimum of two shear points per side.
17.5Pan can pivot 0 to 15 degrees.
17.6Any or all of these brakes are to be air or air-over hydraulic with positive on-off control. The braking system must be strong enough to stop a fully loaded box in a runaway situation.
17.7Box Drive chain: minimum size two single 120 • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 34,000 lbs • American Made or American Assembled preferred.
17.9Must use a minimum of tandem axles.
Section 18 — General Guidelines for Class 7 Sleds
18.1Must be able to transfer 400% of class weight being pulled. Semi will be 250%.
18.2Hook chain is 46 inches long (±½ inch) with all hooks. Chain and all attachments are to be a minimum of 7/8-inch grade 80. Refer to rule 5.23D for pull chain hook anti-unhooking spec.
18.3Steer chains per Section 17.3 above. King pin minimum 2 15/16 inch. Side pins minimum 2 inches with minimum 2 shear points per side.
18.5Pan can pivot 0 to 15 degrees.
18.6Brakes must be air or air-over hydraulic with positive on-off control. Braking system must be strong enough to stop a fully loaded box in a runaway situation.
18.7Box Drive chain: minimum size two single 120 • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 34,000 lbs • American Made or American Assembled preferred.
18.9Must use a minimum of tandem axles.
18.10AWheels must run down inside frame rail flanges, with a minimum of 20 square inches of attachment material between the weight box wheels and the bottom of the weight box, so trolley and box cannot jump out of rails.
Section 19 — General Guidelines for Class 8 Sleds
19.1Must be able to transfer 500% of class weight being pulled except SEMIS 250%.
19.2Hook chain on sled is 46 inches long (±½ inch) with all hooks. Chain and all attachments are to be minimum 1-inch grade 80. Refer to rule 5.23E for pull chain hook anti-unhooking spec.
19.3Steer chains attached to pan and buckboard to be 12 inches (±¾ inch) on each side to pan drawbar at same height from ground. Chains to tie into main pull chain 17 or 18 inches ahead of first pivot point (hammer link). Steer chains to be ½ inch grade 8 chain or next size larger. Both steer chains should be snug when main chain is extended tight and straight ahead.
19.4King pin to be minimum of 3 inches, side pins minimum 2½ inches with 4 shear points.
19.5Pan can pivot 0 to 15 degrees.
19.6All sled brakes must be air.
19.7Box Drive chain: minimum size two single 140 • must meet ASME/ANSI B29.1 Standards • minimum tensile strength 46,000 lbs • American Made or American Assembled preferred.
19.8Drawbar must be minimum 3 square inches of steel at all points including any pinhole with pin removed. The minimum diameter of any pin is 1¼ inches.
19.9Must use a minimum of tandem axles.
19.10AWheels must run down inside frame rail flanges, with a minimum of 20 square inches of attachment material between the weight box wheels and the bottom of the weight box. So trolley and box cannot jump out of rails.
19.10BWeight transfer machines built after January 1, 2005 must be built with the wheels between top and bottom rail flanges inside or outside of rails. Maximum clearance between wheels and rail flanges is ½ inch.
19.11Front Rail Stop: Must have a minimum 2 inch thick steel on front of box rails — rails must run through stop and be welded on both sides. Sleds built after January 1, 2013 will have a minimum of 3-inch thick steel.
19.12Class 8 must run a minimum of 1710 series driveline components.
19.13Class 8 must use billet type rear end and 2 15/16" drive axles in transfer shaft.
19.14Class 8 will use 80 series tooth clutch with adequate supply line pressure with check valve on the pressure side of clutch.