Deere 401-B won't start when hot

Tractor specs:
JD401B Serial Number from plate under seat:
JD401BD 338103T

Numbers from motor:
4219DT 01513439T

RoosaMaster Injector pump
DBGFC431-?- 2DH 2500RPM
Pump Serial # 811790

My dad bought this tractor in March. The guy he bought it from repainted it and said he had changed the injector pump.

The tractor had been hard to start even in 65-70 degree weather. It takes ether to get it to go. After it does start, it runs smooth and has plenty of power. If you shut it off or if it kills, it will not start without cooling off first.

I checked the batteries and cleaned the battery posts. We took the starter off and took it to get rebuilt the guy said it wasn't working correctly. He rebuilt it. We put it on today and the tractor started easily within 5 seconds. We killed it and tried it again and it fired right up. We ran the bushhog on the tractor for about an hour without any problems.

My fater dismounted to talk to me with the tractor running and the loader has a slow leak and the boom lifted all the way up and killed the tractor. We dropped the loader and tried to start but it would only crank with no attempt to run. The starter seems to be turning the motor fast enough, but there is no puffs of smoke coming from the stack.

He is about to give up on this Deere, which is his first ever. He had 2 IHC on his old farm and thought he was ready to retire so he sold the farm and the tractors. He misses the outdoors so he bought some land and wanted to play.

We changed the fuel filter last week and we cracked the fuel line from the mechanical fuel pump and it is pumping fine. I have no experience with the injector pump but I suspect that it is not pumping when the engine is hot. The engine never dies unless dad gets the tractor hung or it bogs down on a hill and dies.

I haven't had a chance to check with anyone local, because this sounds like it should be something simple to fix. Any help will be appreciated. I will put some pics on the web so people interested can see it. Thanks.

I cranked the engine today when it was cool and it didn't start. I gave it a shot of ether and it fired until it burned it up.

Can you give me some insight on how the injector pump works?

Could the shaft that spins the pump have broke?

I took the return line loose and then removed the fitting. There was no signs of black particles. The clear check ball moved freely.

Good or bad, I took the 3 screws from the top of the pump off to see inside where there was some springs attached to the throttle link It was clean inside there. No crud or black pieces.

I reinstalled the checkball fitting and the return hose and checked the inlet line again from the filter while cranking and the fuel is pumping to the injector pump.

Is is difficult to re-time the engine and pump after removing an injector pump? I might be up for removal and replacement, but I know I won't be able to rebuild the pump.

Thanks again for the replies.

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