How to: John Deere JD400 410 hydraulic filter and transmission filter service.

This is a hands-on owner walkthrough of servicing a 1978 JD 400 backhoe's hydraulic and transmission filters, prompted by aerated fluid causing jerky hydraulics. It shows the filter locations, the exact removal process, part numbers (NAPA AT1147 / John Deere AR75603), the drain procedure, and cleaning the screen/sock filter. It's a partial service only, with a fuller job promised for spring. Best for JD 400/410 owners troubleshooting sluggish hydraulics or hunting for filter part numbers.

Posted by Quick Nick Garage, an owner sharing DIY maintenance on his own well-used JD 400 backhoe.