GB 32157-2015Power take-off of fire fighting vehicles (English PDF)

5.4 Manipulation performance

5.4.1 The PTO shall be easy to operate, connected properly; and be free of the stuck or gear off phenomenon.

5.4.2 For the PTO with manual gear up and gear off, when the input shaft speed is no greater than 100r/min, it can be gear up and gear off; its operating force shall be 100N~300N.

5.4.3 For the PTO with electrical gear up and gear off, when the input shaft speed is no greater than 100r/min, it can be gear up and gear off at the rated operating voltage.

5.4.4 For the PTO with pneumatical gear up and spring gear off, when the input shaft speed is no greater than 100r/min, it can be gear up at the rated operating air pressure; and can be gear off automatically after releasing the air pressure. For the PTO with pneumatical gear up and gear off, when the input shaft speed is no greater than 100r/min, it can be gear up and gear off at the rated operating air pressure.

5.4.5 The PTO shall be carried out 5000 times of continuous gear up and gear off tests, the PTO shall work normally during the test, no stuck, gear off or the like abnormal phenomenon shall appear.

5.5 Sealing requirements

5.5.1 Sealing requirements for cooling pipeline The cooling pipeline of the PTO shall be carried out the sealing test, there shall be no leakage.

5.5.2 Sealing requirements for pneumatic device The pneumatic device of the PTO shall be carried out the sealing test, the pressure drop shall not exceed 5% test pressure.

5.5.3 Sealing requirements for the cabinet The cabinet of the PTO shall be carried out sealing test, there shall be no leakage.

5.6 Cleanliness requirements The cleanliness of the PTO shall conform to the Class-H specified in JB/T 7929-1999.

5.7 Noise meets the requirements of 5.2.2.

6.2.3 Check the lubricating oil level check port by visual examination; judge whether the test result meets the requirements of 5.2.3.

6.2.4 Check the cooling pipeline and drain water switch of the PTO by visual examination; judge whether the test result meets the requirements of 5.2.4.

6.2.5 Check the temperature sensor and the fuel filler of the PTO by visual examination; judge whether the test result meets the requirements of 5.2.5.

6.3 Running-in test Install the PTO onto the test bench; add lubricating oil with grade and capacity specified by the PTO operation. No-load operate for 2h at the rated output rotation speed; judge whether the test result meets the requirements of 5.3.

6.4 Manipulation performance

6.4.1 Operate the PTO; judge whether the test result meets the requirements of 5.4.1.

6.4.2 Install the PTO onto the test bench; select the dynamometer with appropriate range; make the direction of the force measurement consistent with the direction of gear up force (gear off force); under the condition that the input shaft speed is no greater than 100r/min, carry out 3 times gear up and gear off tests; measure the gear up and off forces; judge whether the test result meets the requirements of 5.4.2.

6.4.3 Install the PTO onto the test bench; under the condition that the input shaft speed is no greater than 100r/min; carry out 3 times gear up and gear off tests at the rated working pressure; judge whether the test result meets the requirements of 5.4.3.

6.4.4 Install the PTO onto the test bench; under the condition that the input shaft speed is no greater than 100r/min; carry out 3 times gear up and gear off tests at the rated working pressure; judge whether the test result meets the requirements of 5.4.4.

6.4.5 Install the PTO onto the test bench; when the input shaft speed is no greater than 100r/min, continuously carry out 5000 times gear up and gear off tests; judge whether the test result meet the requirements of 5.4.5.

6.5 Sealing test

6.5.1 Slowly pressurize the cooling pipeline to 2.2MPa with a pressure test pump, maintain for 3min; judge whether the test result meets the requirements of 5.5.1.

6.5.2 Supply air by

1.1 times of the maximum working allowable pressure of the pneumatic device; keep the pressure for 5min; then judge whether the test result meets the requirements of 5.5.2. adopted; the provided cooling water pressure is 0.9MPa ~ 1.1MPa; the temperature shall be no treater than 30°C); at the rated rotation speed, continuously operate for 1h with the

1.1 times of the rated output torque; judge whether the test result meets the requirements of 5.9.

7.2 Type inspection

7.2.1 In case one of the following conditions, the type inspection shall be carried out:

a) The trial-type identification of the new product;

b) Trial production and identification of the old products transferring to other factories;

c) After the formal production, significant changes for the structure, process and raw materials;

d) Resume production after 2-year production suspension;

e) Adjustment after the major quality accident;

f) The National Quality Supervision Agency propose the requirements according to the law.

7.2.2 The total number of test samples shall be no less than 3; and randomly select one sample.

7.2.3 Type inspection items indicate all items specified in Table 1.