ASAE S489 FEB03 Hydraulic Pressure Available on Agricultural Tractors for Remote Use with Implements
American Society of Agricultural Engineers
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ASAE S489 FEB03
Hydraulic Pressure Available on Agricultural Tractors for Remote Use with Implements Developed by the ASAE Tractor and Implement Hydraulics Committee; approved by the Power and Machinery Division Standards Committee; adopted by ASAE March 1988; reaffirmed December 1992, December 1997, December 1998, December 1999, January 2001, December 2001, February 2003.
1 Purpose and Scope 1.1. This Standard has the following two purposes: 1.1.1 To establish the pressure available through the pair of hydraulic couplers frequently used to connect hydraulic remote cylinders and other hydraulic devices on implements to agricultural tractors. 1.1.2 To permit interchangeable use of various makes of implements using remote cylinders and other hydraulic devices on various makes of agricultural tractors when both are designed for this use. 1.2 This Standard is applicable only to implements and agricultural tractors intended for interchangeable use. 1.3 This Standard specifies only available hydraulic pressure. Coupler dimensions are specified in ASAE Standard S366, Dimensions for Cylindrical Hydraulic Couplers for Agricultural Tractors.
2 Definitions 2.1 Coupler pair: A pair of female hydraulic couplers compatible with male couplers as specified in ASAE Standard S366, Dimensions for Cylindrical Hydraulic Couplers for Agricultural Tractors. Coupler pairs are mounted on agricultural tractors and are connected to the hydraulic system to allow flow from one coupler and to simultaneously allow flow into the other coupler. 2.2 Available differential pressure: The steady state difference in hydraulic pressure between two male couplers connected to a coupler pair. 2.3 Rated operating pressure: The maximum steady state hydraulic pressure at either male coupler connected to a coupler pair. 2.4 Relief valve pressure: The set point of a relief valve when one is used in a tractor hydraulic system to limit the pressure at the coupler pair. 2.5 Peak pressure: The peak hydraulic pressure at either male coupler connected to a coupler pair.
3 Specifications
4.2 Fig. 1 shows the hydraulic test setup which includes the following: 4.2.1 A pressure transducer with a high frequency response sensing within 100 mm (3.94 in.) of the male coupler connecting the cap end of the hydraulic cylinder to the tractor. 4.2.2 A differential pressure transducer or other suitable pressure transducer sensing within 100 mm (3.94 in.) of each male coupler. 4.2.3 A flow metering valve, having less than 100 kPa (14.5 psi) drop at a flow of one L/s (15.85 gpm) when fully open, mounted in the flow path between the cap end of the cylinder and its associated male coupler. 4.3 The hydraulic fluid shall be that recommended by the tractor manufacturer. 4.4 The throttle or governor control lever shall be adjusted to maintain the rated engine speed. 4.5 The temperature in the hydraulic reservoir shall be 65Ϯ10 °C (149Ϯ18 °F). 4.6 All tractor-mounted flow controls shall be fully open. 4.7 After connecting the cylinder and attaining the other test conditions, the cylinder shall be fully extended and retracted at least 10 times to remove air and to stabilize conditions.
5 Test Procedure 5.1 A test cycle shall consist of extending the cylinder its total stroke. The operator should use the valve detent when practical. When the tractor has no detent or the detent releases, the operator should hold the tractor valve fully open. The travel shall be stopped by the cylinder coming to the end of its stroke. The flow metering valve shall be adjusted to attain the desired cycle time. A test run shall be made at each of the following cycle times: 5.1.1 Full extension in 30Ϯ5 s. 5.1.2 Full extension in the minimum possible time. 5.2 The results shall be recorded as follows: 5.2.1 The available differential pressure shall be the steady state average differential pressure observed during the test run specified in paragraph 5.1.1. 5.2.2 The rated operating pressure shall be the average steady state pressure observed during the test run specified in paragraph 5.1.1 near the coupler attached to the cap end of the cylinder.
3.1 The available differential pressure at minimum available flow shall be at least 16 000 kPa (2 320 psi). 3.2 The rate operating pressure shall not be greater than 20 000 kPa (2 900 psi). 3.3 The maximum relief valve pressure shall not be greater than 25 000 kPa (3 625 psi). 3.4 The peak pressure shall not be greater than 29 000 kPa (4 205 psi).
4 Test Conditions 4.1 The tractor shall be connected to a double acting cylinder without a cushion through a pair of 2 500Ϯ100 mm (98.4Ϯ3.9 in.) long sections of hydraulic hose having a nominal inside diameter of 10 mm (0.375 in.) and being of a suitable construction such as hose SAE 100R2 as specified in SAE Standard J517, Hydraulic Hose. The cylinder dimensions being 80Ϯ5 mm (3.15Ϯ0.20 in.) bore, 30Ϯ5 mm (1.18Ϯ0.20 in.) rod and a 200Ϯ10 mm (7.87Ϯ0.39 in.) stroke. ASAE STANDARDS 2003
Figure 1 – Hydraulic test setup 359
5.2.3 The peak pressure shall be the maximum instantaneous pressure observed during test runs specified in paragraphs 5.1.1 or 5.1.2. 5.3 The following additional information shall be recorded: 5.3.1 Tractor make and model 5.3.2 Relief valve set point (if applicable) 5.3.3 Actual stroke times 5.3.4 Cylinder extend displacement
360
5.3.5 Reservoir temperature Cited Standards ASAE S366, Dimensions for Cylindrical Hydraulic Couplers for Agricultural Tractors SAE J517, Hydraulic Hose
ASAE STANDARDS 2003
