DJI Agras T40 Pre-Season Inspection and Maintenance Guide

The T40's arms carry the weight of the drone and are critical for stability. Unfold the arms and lock them in place. If the arm moves from folded to unfolded with little or no effort, tighten it with a 16 mm socket wrench. Make sure the arms are securely fastened. Hold each arm by the motor base and shake it. Loose arms pose a flight risk and can throw off the drone's calibration. If an arm is loose, use a 16 mm socket wrench to tighten the nut. Make sure the arm safety locks work properly. You should hear a click as the lock seats into place. If the lock is too loose, it can open on its own. If it is too tight, locking and unlocking can be difficult and may cause micro-cracks in the carbon fiber arms. Adjust the tightness of the locking lever with the hex rod inside the arm when it is unfolded.

Unfold the propellers to a position close to 180 degrees. Check the tightness of each propeller and make sure the propeller adapter screws have not loosened over time. After confirming propeller tightness, run your fingers along the propeller edges to check for cracks, nicks, or damage. If you find any, you should replace the propellers. Replace propellers in pairs and use new propeller gaskets. Spin the motors by hand to check for any resistance or rough movement. If you notice difficulty, it is usually caused by coil corrosion, a broken bearing, or other damage inside the motor. In that case, contact your dealer to have a more detailed inspection performed.

Before the season is a great time to recalibrate the spray system. In the DJI AGRAS app, go to the drone's Spray System Settings. Add one liter of water to the spray tank and run an air purge. Perform the Flow Meter Calibration. Empty the tank, go to the Weight Sensors section, and perform the Tare Calibration. Fill the tank with 20 liters of water and make sure the payload weight reads correctly. Turn on the spray nozzles to confirm they reach maximum flow rate and that there are no leaks.

Optimal battery performance can determine your operational efficiency. Before the season is a great time to make sure your batteries can fast charge. Check each battery's charging ports for corrosion or damage. Test whether each battery holds a charge and powers the drone. Then check that fast charging still works. To help batteries last longer, dust, dirt, or debris in the charging ports can be cleaned with a 95% alcohol solution and a cotton swab or microfiber towel. This kind of cleaning should be checked and performed daily.

Test Flights

Once the arms, motors, propellers, and batteries have been checked, you can begin test flights that gradually challenge the drone.

• 1- Power on your drone and let it idle on the ground, checking for any errors.
• 2- Take off slowly and let the drone warm up.
• 3- Fly manually in an open area and evaluate the drone's response.
• 4- Run radar tests with obstacles and check the drone's altimeter readings.
• 5- Test the drone's automatic functions. Create a flight route and let the drone complete it.
• 6- Fill the drone's spray tank and fly manually. This extra weight and load will test the drone's endurance.

  Spare Parts and Repairs

  Before the season starts is a great time to stock up on spare parts, tools, and basic repair knowledge. This preparation can make the difference between a short delay and a lost day.

  Spare Parts

  We recommend stocking spare parts that can be replaced quickly in the field. This applies to motors, ESCs, propellers, propeller gaskets, and other common quick repairs.

  Tools and Organization

  Having the right tools is just as important as having spare parts. Using magnetic trays to keep small parts in place is helpful. Keeping your workspace organized is critical during repairs.

  Repair Tips and Troubleshooting Strategies

  Be systematic. If a repair is needed, assess the damage in a well-lit area. If necessary, take photos to document the process. Inspect each part carefully and stay organized.

  Authorized Service Centers and Getting Help

  Explore DJI Agriculture's network of Authorized Service Centers (ASC) for support options. Visit our website to find the nearest ASC: DJI Authorized Service Centers. ASC details are also available through the DJI SmartFarm app, where you can request repair services directly for any issue.

  Action Plan

  Maintaining your DJI Agras T40 is about more than completing a checklist. It is a discipline that ensures the longevity and efficiency of your investment. Implementing a thorough pre-season maintenance routine, stocking key spare parts, and learning repair and troubleshooting strategies provide peace of mind and operational longevity. By following this maintenance guide, you can be confident in your T40's performance. Now, take the time to carry out these checks, prepare your spares, and learn the troubleshooting knowledge. Your next spraying season is ready to be your most efficient yet.