Motor relay on Radial Arm Saw

andygame · Nov 1, 2021

I have an old DeWalt 721 Radial Arm saw that recently stopped working. Initially I thought this was because one of the Start / Stop buttons disintegrated (came unscrewed) and spread its workings all over the floor. I subsequently changed both the switches like for like. (Rafi 1.10001). Unfortunately the saw was still not operational. Next port of call was the contactor, housed in a small box to the side of the saw. As far as I can ascertain with a multimeter, there is 240v going in, but nothing coming out. The relay is a Tripus 305.233 (8 pins). Contactor (undervoltage release) Tripus 305.233 - https://www.kahlhorn.com/schuetz-tripus-br01-305233::805.html.
Unfortunately I can't find anyone that can supply this in the UK and the european suppliers are currently not delivering to the UK inside of about 4-5 weeks. I've looked at one possible alternative (Kedu JD3) which seems to be listed as a replacement (the 8 pin version) - but again, I'm not having much joy sourcing in the UK in a short time frame.
All the spare parts companies that I've tried, list the DeWalt part as discontinued or unavailable.
I use the saw on a daily basis and need a quick but reliable fix. Is there something that I can replace it with that might be readily available off the shelf or am I destined to wait weeks for a replacement.
Thanks Guys - any advice would be appreciated.

Lucien Nunes · Nov 3, 2021

I think you are not getting responses because it is a bit of a dilemma. There might be alternative products that could replace the original as far as functions are concerned. But as a safety-critical component, one would be reluctant to suggest anything other than the original, as that would require taking on the responsibility for the modified design. You might just have to wait for the genuine part.

Megawatt · Nov 6, 2021

andygame said:
I have an old DeWalt 721 Radial Arm saw that recently stopped working. Initially I thought this was because one of the Start / Stop buttons disintegrated (came unscrewed) and spread its workings all over the floor. I subsequently changed both the switches like for like. (Rafi 1.10001). Unfortunately the saw was still not operational. Next port of call was the contactor, housed in a small box to the side of the saw. As far as I can ascertain with a multimeter, there is 240v going in, but nothing coming out. The relay is a Tripus 305.233 (8 pins). Contactor (undervoltage release) Tripus 305.233 - https://www.kahlhorn.com/schuetz-tripus-br01-305233::805.html.
Unfortunately I can't find anyone that can supply this in the UK and the european suppliers are currently not delivering to the UK inside of about 4-5 weeks. I've looked at one possible alternative (Kedu JD3) which seems to be listed as a replacement (the 8 pin version) - but again, I'm not having much joy sourcing in the UK in a short time frame.
All the spare parts companies that I've tried, list the DeWalt part as discontinued or unavailable.
I use the saw on a daily basis and need a quick but reliable fix. Is there something that I can replace it with that might be readily available off the shelf or am I destined to wait weeks for a replacement.
Thanks Guys - any advice would be appreciated.

How do you know that your getting power to pull in the coil in on the relay?