The 803591856 is a two-section arm angle sensor used in XCMG crane systems. It is part of the safety monitoring system that provides real-time boom position data for load moment indicator functions.

1. Installation Location
This sensor is mounted on the lifting boom side, typically on the basic arm section . The housing contains a damped pendulum mechanism for angle measurement . The sensor assembly is positioned to measure the boom's luffing angle relative to the horizontal plane during crane operation .

2. Function
The sensor monitors the boom angle and transmits signals to the crane's control system. It works with the safety system to prevent overload conditions by providing accurate boom position data . The angle measurement is used by the load moment indicator (LMI) system to calculate safe working loads .

3. Maintenance and Service
This sensor assembly is a sealed unit and contains no user-serviceable internal parts. If the angle reading becomes erratic or shows incorrect values, first check the electrical connections and wiring harness for damage or corrosion. The sensor should be replaced with an identical 803591856 unit if confirmed faulty. Ensure the mounting bracket is secure, as vibration can affect sensor accuracy.

4. Important Notes
Verify the part number 803591856 matches the original component specification before installation. Proper sensor calibration is required after replacement to ensure accurate angle readings; refer to the crane service manual for the correct calibration procedure.