Product Description
**Milwaukee parts change not only by model# but also by serial number. To look up your tools parts break down on Milwaukee's website please click here:
Milwaukee Switch and PCB Assembly
Model Number: 23-66-0318
The Milwaukee 23-66-0318 is a genuine OEM Switch and PCB Assembly for the 2420-20, 2420-21, 2420-22, and 2420-059 M12 HACKZALL reciprocating saws. This is the integrated electronic control unit for the HACKZALL, combining the trigger switch, the PCB (printed circuit board) that controls the motor, and the wiring into one complete assembly. It is the operator's control interface and the saw's electronic brain: pulling the variable-speed trigger signals the control board to power and speed the motor, and releasing it stops the saw. Supplied as a complete assembly, it comes with the switch, the control board, and the full wiring harness together, so the saw's control electronics are replaced as a matched unit. Because the switch is actuated on every use and the assembly combines mechanical and electronic components that carry the switching current, it is a genuine wear and service item. A worn or failed switch and PCB assembly causes erratic speed control, intermittent operation, a trigger that sticks or does not respond, or a saw that will not reliably start, stop, or run. Replacing it with the correct genuine Milwaukee OEM switch and PCB assembly restores full, reliable trigger control and motor operation.
Because Milwaukee Tool specifies replacement parts by both catalog number and serial number, always verify your tool's serial number against the official Milwaukee service parts diagram before placing your order, since running production changes can alter part compatibility within the same catalog number, and electronic assemblies are specific to the exact tool they control. This switch and PCB assembly is specified for the 2420 M12 HACKZALL reciprocating saws, so confirm your tool's catalog and serial number against the parts diagram before ordering. Because this is an electronic assembly with a multi-wire harness, replacing it involves opening the tool and working with the internal wiring; note or photograph the wiring connections and routing before removing the old assembly, seat the PCB correctly in the housing support slots, and route and connect the new assembly exactly as original so the wires seat correctly in their traps. Service should be performed by someone competent to work on power tool electronics, following the tool's service procedure. The motor assembly, housing, and battery terminal that connect to the switch and PCB assembly are separate parts, so refer to your tool's parts diagram for the correct companion part numbers.
Features
- Genuine Milwaukee OEM service part, not an aftermarket substitute
- Switch and PCB Assembly for the 2420 M12 HACKZALL reciprocating saws
- Integrated trigger switch, control PCB, and wiring in one assembly
- The operator's control interface and the saw's electronic control unit
- Variable-speed trigger signals the board to power and speed the motor
- Supplied as a complete unit with the switch, board, and wiring harness
- Restores reliable trigger control and motor operation when failed
- Corrects erratic speed control, a sticking trigger, or failure to start or stop
- A genuine wear and service item, actuated on every use
- Specific to the tool it controls, so verify fitment on the diagram
- Note the wiring routing before replacing, service by a competent servicer
- Verify catalog number and serial number before ordering
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 23-66-0318
- Official Description: Switch and PCB Assembly
- Component Type: Trigger switch and control board (PCB) assembly
- Contents: Trigger switch, PCB control board, and wiring harness
- Function: Operator trigger and variable-speed electronic control of the motor
- Primary Fitment: 2420-20, 2420-21, 2420-22, and 2420-059 M12 HACKZALL
- Parts Diagram Position: Figure 20 on the M12 HACKZALL service parts list (bulletin 54-40-6515)
- Also Referenced On: Verify additional applications using Milwaukee's online parts lookup
- Quantity: Sold individually, (1) required per tool
- Part Type: Genuine Milwaukee OEM Replacement Part
Includes
- (1) Milwaukee 23-66-0318 Switch and PCB Assembly (switch, control board, and wiring)
The motor assembly, housing, battery terminal, and other components that connect to the switch and PCB assembly are NOT included, vary by tool, and are sold separately - refer to your tool's parts diagram for the correct part numbers and quantities. Always verify by serial number using Milwaukee's online parts lookup before ordering.
