Official Name: Reverse Alarm / Reverse Beeper (Backup Alarm)
Original Equipment Manufacturer (OE) Number: 803504584
Matching Model: PRECO-380 Imported Piezoelectric发声 Unit
Compatible with all XCMG models
Single-wheel Road Roller： XS163J, XS183J, XS203J, XS223J, XS263J, XD133S, etc.
Grader： GR1653, GR1803, GR2205III
Loader： ZL50GN, LW500FV/HV/KV Series
Power Supply for the Whole Machine： 24V DC (unified voltage for construction machinery)
Installation Position： Rear of the frame, beneath the counterweight, inside the rear hood, exposed waterproof installation
Shell: One-piece molded from black hard ABS engineering plastic, grille-style dust-proof design for the speaker opening, IP65 waterproof, dustproof, and anti-sand protection, suitable for exposure to sun, mud, and low-temperature environments at construction sites.
Fixed base: Integrated double-ear mounting bracket, standard M6 bolt fixing holes, hole spacing 40mm×40mm, installation does not require additional brackets.
Electrical wiring: 2 red and black straight-out wires, no plug type, can be directly connected to the vehicle's reversing wiring harness; original factory comes with oil-resistant and wear-resistant rubber sheath.
Size and weight: Square flat box shape, the net weight of the entire machine is approximately 0.34kg.
Sound core: Built-in imported piezoelectric ceramic sound sheet, without mechanical diaphragm, less prone to wear and water ingress.
When the vehicle shifts into reverse gear, the reverse gear pressure switch in the gearbox conducts the circuit, and 24V current is sent to the buzzer. The piezoelectric unit vibrates at a high frequency, emitting a warning sound. After shifting out of reverse gear, the circuit is disconnected, and the buzzer stops. This is used to alert the workers and vehicles at the construction site to avoid heavy construction machinery and prevent crushing accidents.
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