SAE J1144-2000 pdf download Towed Vehicle Drivetrain Test Procedure Passenger Cars, Vans, and Light-duty Trucks
References
Applicable Publications–The following publications form a part of the specification to the extent specifiecherein. Unless otherwise indicated, the latest version of SAE publications shall apply.
2.1.1SAE PUBLICATIONS-Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001.
SAE J1142-Towability Design Criteria and Equipment Use-Passenger Cars, Vans, and Light-DutyTrucksSAE J1143-Towed Vehicle/Tow Equipment Attachment Test Procedure-Passenger Cars, Vans,andLight-Duty Trucks
Definitions-See SAEJ1142paragraph 3.
Test Equipment
Tow Truck
Tow SLING EQUIPMENT-PASSENGER CARS, VNS,AND LIGHT-DUTY TRUCKS BEING TOWED WITH TOW SLINGEQUIPMENT–The tow vehicle used should conform to criteria set in SAE J1142, 4.2.1 through 4.2.3.1.
4.1.2WHEEL-LIFT EQUIPMENT-PASSENGER CARSVANS,AND LIGHT-DUTY TRUCKS BEING TOWED WITH WHEEL-LIFTEQUIPMENT–The tow vehicle used should conform to criteria set in SAE J1142, 4.3.1 through 4.3.3.
4.1.3Additional towing equipment, as necessary, to safely tow the vehicle, See SAE J1142, 4.1 through 4.1.6.
4.1.4Other equipment and information as required. See SAE J1142, Section 6.
4.2Vehicle Ballast
5Towed Vehicle Drivetrain Test Procedure-Passenger Cars, Vans, and Light-Duty Trucks
Towed Vehicle Preparation5.1
The vehicle shall be the model with the heaviest maximum curb weight for which the drivetrain combination5,1.
to be tested is used. A ballast may be used, if required.
5.1.2The vehicle shall be equipped with a combination of tires and differential ratio, which gives the highest N/V(engine rpm per vehicle km/h (mph) ratio as recommended by the vehicle manufacturer for which thedrivetrain combination to be tested is used).
5.1.3The fluid levels in transmission and differential shall meet the minimum specifications for normal vehicleoperation.
5.1.4The ride height shall be within the vehicle manufacturer’s specifications prior to testing.
5.1.5TEST VEHICLE LOADS
5.1.5.1The passenger cars shall be loaded to the vehicle manufacturer’s recommended cargo weight rating.
5.1.5.2The vans and light-duty trucks shall be loaded as specified by the vehicle manufacturer.
5,1.6Record final vehicle weights (See Figure 1).
5.1.7DRIVETRAIN COMBINATION BREA-N-Drive the test vehicles for 80 km 50 miles) at 88 km/h (55 mphconstant speed, with the transmission selector in Drive position for automatic transmissions and Highposition for manual transmission. After each 8 km (5 miles), make a moderate stop and subsequentmoderate acceleration back to 88 km/h (55 mph).
5.1.8The drivetrain shall meet acceptable noise levels after break-in.
5.2Vehicle Test Procedure
5.2.1Park the test vehicle on level ground for 8 h minimum for oil drain down.
5.2.2For front-wheel-drive and four-wheel-drive vehicles, set the front wheels in a straight-ahead position andsecure the steering wheel according to SAE J1142, 4.1.5.
5.2.3With the tow truck and vehicle on level ground, atach the towing equipment to the vehicle following thevehicle manufacturer’s recommended procedure for the towing of vehicles on their drive wheels.
5.2.3.1For tow sling equipment, raise the lifted wheels to 102 mm (4 in) from the bottom of the tire above theground.
5.2.3.2For wheel-lift equipment, position retaining/L arms as recommended by the equipment manufacturer andraise the front wheels to a minimum of 255 mm (10 in) from the bottom of the tire above ground.
Place the ignition switch and the transmission selector in an applicable position for towing and release the5.2.4parking brake.
5.2.5TOWING TEST PROCEDURE(REAR-WHEEL-DRIVE VEHICLES)
NOTE-For recording purposes, use the towed vehicle drivetrain test data sheet or equivalent (see Figure1).
5.2.5.1Tow the vehicle at 88 km/h (55 mph) for 80 km (50 miles). Refer to SAE J1143, 5.2.12.
5.2.5.2Detach the vehicle from the tow truck and drive the vehicle to evaluate the vehicle drivetrain for normaoperation.
5.25.3Remove the drivetrain combination from the vehicle, disassemble, and inspect for damage that couldcause a premature failure and record.
5.2.5.4Install drivetrain.
5.2.5.5Drive the vehicle to determine if the vehicle is operating at normal functionality.
5.2.6TOWING TEST PROCEDURE (FRONT-WHEEL-DRIVE VEHICLE)