GB/T 3871.3-2006Agricultural tractors -- Test procedures -- Part 3: Power tests for power take-off (English PDF)

6.1 Power take-off test

For the tractors equipped with the power take-off as specified in GB/T 1592, it shall test one or more power take-off as given by the tractor manufacturer.

When one of the power take-off is capable of transmitting the full power of the engine, it shall also include the test for this power take-off.

6.1.1 General

All tests shall generally be able to be carried out continuously.

The angle of the connection of the shaft connecting the tractor PTO to the dynamometer shall not exceed 2°.

If an exhaust gas discharge device for the test area is used, it shall not impact the engine performance.

6.1.2 Power

6.1.2.1 Maximum power

After the engine is warmed up to reach the stable running conditions, under the maximum power of the power take-off, the tractor is subject to 2 h test; Measure the speed, torque and fuel consumption, etc.

The maximum power quoted in the test report shall be the average of at least six readings made at regular intervals during the 2 h period. If the measured power varies by more than 2 % from the average, repeat the test. If the variation continues, it shall report this deviation.

For a tractor not fitted with a PTO capable of transmitting the full power of the engine, operate it for 2 h at a power specified by the manufacturer for the test.

If possible, a 20 % increase in power shall be applied every 5 min for a period of 1 min. If the engine cannot develop the 20 % increase in power, carry out the intermittent test at full engine power. Omit the tests described in 6.1.3 and 6.1.4.

6.1.6 Presentation of results

The data in 6.1.1 to 6.1.4 shall be recorded in tabular form. If also presented in graphical form (which is optional), the following curve relations, covering the full range of engine speeds tested, shall be included:

- Power as a function of speed;

- Torque as a function of speed;

- Fuel consumption (mass) and specific fuel consumption (mass) as a function of speed;

- Specific fuel consumption (mass) as a function of power.

Record the no-load maximum engine speed.

6.1.7 Additional measurements

In addition to the performance measurements, it shall also record the following data:

- At about 2 m in front or side of the tractor, in front of the air inlet of the tractor fan, measure the atmospheric temperature at a representative point about

1.5 m above ground. When the tractor is equipped with forward-blowing fan, this point shall be about 2 m behind of the tractor, at a height 1.5 m above ground;

- Measure the air inlet temperature of the engine in the upwind air flow at a point 5 cm away from the inlet of the air cleaner, the temperature probe shall be equipped with the device to prevent radiated heat;

- Atmospheric pressure;

- Relative air humidity;

- Measure the coolant temperature at the water outlet of the engine (in the case of an air-cooled engine, measure the temperature of the cylinder block at representative points);

- The fuel temperature at the inlet to the carburettor or injection pump;

- Measure the engine oil temperature at the half point of oil level depth in the engine bottom shell.

6.2 Belt or pulley shaft tests (optional)

At the manufacturer's request, the power available at the belt or pulley shaft of tractors, if fitted, may be measured.

Appendix A (Normative)

Power take-off test report

A.1 Location

Tractor manufacturer's name and address: _______________

Place of running in: _______________

Duration of running in: _______________

A.2 Specification of tractor

Tractor

Model: _______________ Serial No.: _______________

Engine

Make: _______________ Model: _______________

Type: _______________ Serial No.: _______________

Rated speed: _______________ r/min

Cylinders

Number: _______________ Bore: _______________ mm

Stroke: _______________ mm Capacity: _______________

Fuel and injection system

Capacity of fuel tank: _______________ L

Make, type and model of injection pump: _______________

Manufacturer's production setting: _______________

Make, type and model of injectors: _______________

Make, type and model of magneto, coil and distributor: _______________

Make, type and model of carburettor: _______________

Ignition or injection timing (manual or automatic): _______________

Chinese Standards

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Translated by: Field Test Asia Pte. Ltd. (Incorporated & taxed in Singapore. Tax ID: 201302277C)

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