4341545 Original Excavator Throttle Controller for Hitachi ZX125W

Part number 4341545 is a genuine electronic throttle controller produced by Hitachi Construction Machinery Co., Ltd. in Japan. Specially designed for Hitachi ZX125W wheel excavator, used for precise control of engine speed. It is worth noting that the label "Support Chain" is a universal identification for specific categories of components within Hitachi, and does not represent its use for tracks, but rather confirms that it is an original genuine walking equipment component. This controller may also be applicable to W series wheeled models with the same tonnage and electronic control system, such as ZX135W and ZX140W.

This product is a rotary encoder electronic throttle controller, with a black engineering plastic panel as the main body and a large rotary encoder knob in the center for stepless adjustment of engine speed. The "r/min" unit next to the knob clearly indicates its function. The panel integrates power/mode switches and HPE (Hydraulic Power Enhancement) function buttons. Multiple colored wires are connected to the back and consolidated into a white multi pin waterproof plug to ensure reliable signal transmission. Its core function is to convert the operator's knob commands into PWM (Pulse Width Modulation) signals or CAN bus messages, which are sent to the engine ECU to achieve precise and linear control of engine speed. It is a key input device for equipment to achieve efficient and energy-saving operations.

Installation and connection: 1 Power off operation: Before replacement, be sure to disconnect the negative terminal of the battery. 2. Plug in installation: Remove the old controller from the driver's console and unplug the white electrical plug. Align the new controller (4341545) with the panel mounting hole and fix it, then plug the plug in the correct direction and lock it in place. 3. Function testing: Restore power, start the engine, test whether the engine speed changes smoothly when the knob is in various positions, and test whether the HPE switch function is effective. Fault diagnosis: If the engine speed is not controlled, remains constant at a certain speed, or the instrument displays a throttle signal fault, the plug connection and wiring harness of the controller should be checked for damage first. Then, the diagnostic instrument can be used to read whether the output signal value changes linearly with the rotation of the knob.