try to pull the trigger more back then its stand free , because i think that a dust ring insite the trigger was come loose and get inside the trigger so it will not fully come back in its normal rest position but its stands maybe a little fraction triggered , replace the switch .
This will be a suggestion...but for mine I bought two 18650 LiFePo4 cells (3.7V each) and replaced the original NiCd Batteries. It has been working for many years now, since the original batteries expired and stop working in 2002 (I bought the CD 1000 back in 1994!!!!!). You have to use a special charger for the new ones but they stay charged a lot more and the drill has more torque.
If you've replaced the variable speed unit in your Bosch 11318EVS SDS-max Demolition Hammer and the variable speed is still not working, there could be a few potential reasons for this issue. Here are some steps you can take to troubleshoot and address the problem:
Check Wiring Connections: Ensure that all wiring connections related to the variable speed control are properly connected and secure. Loose or damaged wires can disrupt the variable speed function.
Control Switch: The control switch itself could be faulty. Test the switch to make sure it's functioning as intended. Use a multimeter to check for continuity across the switch terminals in different speed settings.
Speed Control Potentiometer: The potentiometer, which is responsible for adjusting the variable speed, could be malfunctioning. Test the potentiometer with a multimeter to ensure it's changing resistance smoothly as you adjust the speed.
Electronic Control Board: The issue could be with the electronic control board that governs the variable speed function. Inspect the board for any signs of damage, such as burnt components or solder joints.
Brushes and Carbon Motor Contacts: Worn brushes or carbon motor contacts can affect the motor's performance and, consequently, the variable speed control. Check the condition of the brushes and motor contacts and replace them if necessary.
Power Supply and Voltage: Ensure that the tool is receiving the correct power supply and voltage. Incorrect power supply can affect the tool's overall performance.
Manufacturer's Support: If you've exhausted your troubleshooting efforts and the variable speed is still not working, it's advisable to contact Bosch customer support or a professional tool technician. They can provide more specific guidance based on the model and diagnose the issue accurately.
Professional Repair: If the issue is complex or involves internal components, it might be best to seek the assistance of a professional tool repair technician who has experience with Bosch power tools.
Remember that working with power tools and electrical components carries inherent risks. If you're not comfortable or experienced with tool repairs, it's recommended to seek professional assistance to ensure safety and prevent further damage to the tool.
All questions need 'make model (what it is)' as the first 3 words.
It is likely to be the selector, Undo-Lock-Clockwise, or it is the gearbox or switching mechanism, depending on type.
With make and model not stated, you can look it up
make model only works in reverse
..
could just be the switch. while you have it apart I would check the condition of the motor brushes. The switch is around 40.00. Let me know if you need more help
on the m12 impact, when you look in battery well or after opening 3 wires for to battery connectors, check the whites soldering and how many wires are actually soldered in the whites line ... just fixed buddy's who had exact issue and only 3 strands were soldered, stripped about a centimeter more and soldered back on and boom issue solved.
Here are the wire placements for the switch of a DeWalt DWD520 hammer drill:
The red wire from the motor goes to the top left terminal on the switch.
The black wire from the motor goes to the top right terminal on the switch.
The white wire from the power cord goes to the bottom left terminal on the switch.
The black wire from the power cord goes to the bottom right terminal on the switch.
It's always recommended to double-check the manual or contact DeWalt customer service for confirmation, as wire placement may vary depending on the specific model and year of manufacture.
