ISO 789-2:2018
Agricultural tractors — Test procedures — Part 2: Rear three-point linkage lifting capacity
ISO 789-2:2018 specifies test procedures for determining the lifting capacity of rear-mounted three-point linkage systems:
a) the maximum vertical force which can be exerted by the hydraulic lift at the lower hitch points throughout their full range of movement;
b) the maximum vertical force which can be exerted by the hydraulic lift, at a point 610 mm to the rear of the hitch points on a frame attached to the three-point linkage, throughout its full range of movement.
NOTE 1 A static test provides an adequate comparison between tractors. The test results are used only as a means of comparing tractors and not as a way of recommending the size of an implement which can be carried by the tractor.
NOTE 2 This test procedure can be used to determine the lifting capacity of front-mounted three-point hitch systems.
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement units and tolerances
5 General requirements
5.1 Selection
5.2 Running-in and preliminary adjustments
5.3 Manufacturer's instructions
5.4 Repairs
5.5 Preliminary information
5.6 Hydraulic fluid
5.7 Ambient conditions
6 Test procedures
6.1 Common procedures
6.1.1 Secure
6.1.2 Adjustment
6.1.3 Throttle lever
6.1.4 Measured maximum performance
6.2 Lift at lower hitch points
6.3 Lift on coupled frame
7 Test report
Bibliography
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Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement units and tolerances
5 General requirements
5.1 Selection
5.2 Running-in and preliminary adjustments
5.3 Manufacturer's instructions
5.4 Repairs
5.5 Preliminary information
5.6 Hydraulic fluid
5.7 Ambient conditions
6 Test procedures
6.1 Common procedures
6.1.1 Secure
6.1.2 Adjustment
6.1.3 Throttle lever
6.1.4 Measured maximum performance
6.2 Lift at lower hitch points
6.3 Lift on coupled frame
7 Test report
Bibliography