Let's Learn How to Take Tractor Performance Test

The tests are designed to collect data that can be used to evaluate the performance of tractors of various makes and models. As a result, all tests are carried out under the same or similar test conditions and procedures. Tractor tests are typically performed to evaluate the performance of the PTO (power take-off), drawbar, hydraulic lift capacity, and hydraulic system pressure and flow. Furthermore, sound levels are measured at operator and bystander locations.

PTO Performance Test

PTO performance tests are carried out using a dynamometer connected to the tractor PTO. The dynamometer's purpose is to apply varying loads through the PTO and measure the power generated by the tractor. These tests are carried out at a temperature of 75°F and a barometer reading of more than 28.5 inches of mercury. When the tractor's performance has stabilized during testing, the data is recorded at predetermined intervals.

The dynamometer's load follows the engine's operating curve at full throttle. Torque, rpm, power, and fuel consumption are among the data collected. For these parameters, a series of PTO tests are performed.

PTO tests are conducted for these parameters:

• at maximum engine speed,
• at normal PTO speed (either 1,000 or 540 rpm),
• at the engine speed that produces the most power,
• under varying loads, and
• at the maximum torque

All gears between one below the one that provided maximum drawbar force (without exceeding a 15% wheel slip) and a maximum speed of 10 miles per hour are tested for drawbar performance. At full throttle, the load is increased in each gear until maximum drawbar power is achieved. When test conditions are stabilized, data on engine speed, wheel slip, and fuel consumption are recorded.

Drawbar Performance tests

Drawbar tests with partial loads of 75% and 50% of the maximum drawbar load are also performed (at rated engine speed). These partial load tests are also carried out at lower engine speeds (selected by the manufacturer).

Hydraulic lift capacity and flow tests

Hydraulic lift capacity and flow tests are performed to determine the hydraulic system's maximum lift capacity across the entire lift range. According to the report, the lift capacity is 90% of the maximum load carried over the entire lift range.

Additional tests are also carried out to determine the hydraulic system's pressure-flow relationship for supplying power to external actuators (such as motors or cylinders). Data on delivery rate, pressure, and available power are all included in the reports.

Sound Level Test

During performance tests, sound levels are measured at the operator and bystander locations. The readings are taken at the bystander location by placing the microphone 25 feet from the tractor's center line. Sound levels are measured with a sound level meter and expressed in decibels (dB) (A). The "A" scale is a filter that works similarly to the human ear.

Also Read:- Importance Of Using Test Reports in Tractor Selection