" blower from a 300d will fit the 240?"


It should be the same. You can replace the brushs if thats the problem. I've used appliance brushs from Ace Heardware, they wont last as long as the OEM ones but...

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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug

"Lifes too short to drive a boring car"