The three-point hitch static lift force test procedure was revised to be comparable to current ISO and to 1990 changes to OECD Test Codes. (See OECD document AGR/CA/T(91)24/REV1 for reference.) These test codes use a static lift force corrected to 90% of minimum hydraulic pressure to reflect usable in-field lift forces. This revision is also being proposed for J2708.
The dynamic lift capacity test procedure was expanded to include additional lift times. Lift capacity values for 3 s and 6 s lift times were added to the existing 10 s lift time. This was also done to be more representative of in-field operations.
Determination of tractor height as tested was expanded to include rubber-tracked vehicles.
The report form was revised to reflect these changes.
J283 is not technically equivalent to ISO 789/II due to:
Current differences between SAE (ASAE) and ISO hitch dimensions as tested.
SAE does not include a lift test at the hitch points.
ISO does not have a dynamic test procedure.