How to fix a National 5600 Power Tool scraper that doesn't work under pressure?
- BBrian MartinezAug 7, 2025
If your National Power Tool scraper isn't working while the pump is generating pressure, it could be due to a severe blockage in the wheel drive motor hoses or defective wheel drive motors. Check the hoses for blockages and replace them if necessary. If the wheel drive motors are defective, contact the National Service Center.


