This standard specifies the test conditions and test methods for the hydraulic suspension system of agricultural tractors. This standard applies to the hydraulic suspension system of agricultural tractors. JB/T 6714.2-1993 Test methods for hydraulic suspension system of agricultural tractors JB/T6714.2-1993 Standard download decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China
JB/T6714.2-1993
Hydraulic suspension system of agricultural tractors
Test methods
Published on July 29, 1993
Ministry of Machinery Industry of the People's Republic of China
Implemented on January 1, 1994
Mechanical Industry Standard of the People's Republic of China
Hydraulic suspension system of agricultural tractors
Test methods
Subject content and scope of application
JB/T6714.2-1993
This standard specifies the test conditions and test methods for the hydraulic suspension system of agricultural tractors (hereinafter referred to as the hydraulic suspension system). This standard applies to the hydraulic suspension system of agricultural tractors. Reference Standards
GB/T 3871.4
Test Methods for Agricultural Wheeled and Crawler Tractors 3 Test Conditions
3.1 Test Equipment
Part 4: Hydraulic Lifting Capacity and Output Power Test The hydraulic suspension system test can be carried out on a matching tractor or on a test bench simulating the tractor state. The test bench simulating the tractor state should meet the following requirements: The layout and installation of the hydraulic components (pump, cylinder, valve, lifter, hydraulic output valve and oil filter) and suspension rods of the hydraulic suspension system a.
The layout and installation method should be consistent with those on the tractor;
The speed of the hydraulic pump should be consistent with the speed of the pump at the rated engine speed on the tractor; b.
The size and layout of the connecting pipes used should be as consistent as possible with those on the tractor; c.
It should have an oil temperature control device.
The test equipment should also include: loading device, special frame, adjustable flow valve and ruler, etc. 3.2 Test Instruments
The test instruments shall be specified by the relevant departments and within the valid use period. The accuracy of each measurement parameter shall comply with the provisions of Table 1. Table 1
Operating force
Approved by the Ministry of Machinery Industry on July 29, 1993
Performance test
Durability test
Implemented on January 1, 1994
3.3 Test oil and oil temperature
JB/T6714.2-1993
The test oil shall comply with the provisions of the matching tractor. The oil temperature for the performance retest after the performance test and durability test is 65±5℃, the ambient temperature for the static settlement test is 23±7℃, and the oil temperature for the durability test is 80±5℃. 3.4 Measurement lead-out point location
The temperature measurement lead-out point shall be near the oil tank outlet. The pressure measurement lead-out point shall be as close as possible to the required pressure measurement point and shall avoid disturbance sources. Test method
4.1 Running-in
Perform according to the specifications of the matching tractor. 4.2 Type test
4.2.1 The detection of the size, maximum lifting force, lifting stroke, lifting time, static settlement, operating force and hydraulic output power of the three-point suspension device shall be carried out in accordance with the provisions of GB/T3871.4.
The durability test shall be carried out in accordance with the following provisions:
a. Load on the tractor suspension shaft or 610mm behind the suspension shaft, and the load amount shall be 90% of the maximum lifting force measured at the corresponding position; b. Lift 300,000 times in full stroke, with a frequency of not less than 6 times/min; c.
After the durability test, re-measure the lifting stroke, lifting time and 30min static settlement value, and check whether the parts of the hydraulic suspension system are damaged.
Additional remarks:
This standard is proposed by the National Technical Committee for Tractor Standardization. This standard is under the jurisdiction of the Luoyang Tractor Research Institute of the Ministry of Machinery Industry. This standard was drafted by Luoyang Tractor Research Institute of the Ministry of Machinery Industry. The main drafter of this standard is Ma Quanfu.
People's Republic of China
Mechanical Industry Standard
Hydraulic Suspension System of Agricultural Tractor
Test Method
JB/T 6714.2-1993
Published and issued by the China Academy of Mechanical Science
Printed by the China Academy of Mechanical Science
(No. 2 Shouti South Road, Beijing
Postal Code 100044)
Sheet 1/4
Format 880×1230
Word Count 4,000wwW.bzxz.Net
First Edition in December 1993
First Printing in December 1993
Print Quantity 1-500
Price 2.00 Yuan
Mechanical Industry Standard Service Network: http://www.JB.ac.cn669
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