Starting procedure , maybe stuck engine ? Cat d2

the decompression lever should say "Start" "Run" the start position is engine decompressed and the run position is for running normally. is it possible that the batteries are low? or main engine is stuck? try with main clutch disengaged.

Thanks for reply , batteries are new , and appear to have full charge , I did try with clutch in but same result . , reading about injector removal , is there special tool for that ?

U series tractors you only need a 3/4 open end wrench to take the line off and then a breaker bar with a 1" socket to remove the hold down nut. Then the injector "body" or adapter with the actual valve screwed on the end will lift out. Usually just jiggle it with fingers but sometimes need to pry up on it a little with a screwdriver etc. If you get one really stuck you can screw the line back on it to give something to pry against.

Generally the decompression lever is out to decompress and in to run, but they can be hooked up differently on some early machines.

J series tractors with intake and exhaust manifolds on same side of engine have tall high pressure injectors and require a special socket to remove them by turning the big attached hold down nut out.

Yes glowplugs. Generally turn switch back to left to heat them and then right to crank. Amp meter should show a draw from battery when you heat them. Maybe 2-3 amps per cylinder on 24 volts.

Are you sure you have the batteries installed correctly. Factory was 24 volts so 2 twelve volt batteries connected in series but most conversions use 12 volts so 2 12's connected in parallel is common.

Thank you for the advice , I am away from the unit now but will double. Heck everything related to the batteries when I return . This is a beautiful cat d2 and even has a super pro roll bar , labeled safe t cab on it . I will post pics when I return

Don't worry about the injectors until you have determined if the engine will turn over. Grab the fan and give it a pull.

Regardless of the position of the start/run lever you should be able to figure out if the engine is mechanically free.

Have you tried spining it over by the crank lever

Just because it happened to me, you might want to take the clutch inspection cover off and check for a mouse house. Had one build a nest around the starter pinion and locked it up tight.
Either way you need to find out what is locked up before you try to force it to spin and really break something

Thank you all again for the advice , it will. E another week before Ian back on the property and I will report findings . The cat has a pump on very front of engine . I am not sure of a crank lever location . I did pull on the fan and it was able to spin , it slips along the belt.