656 Diesel d282 won't run

Decided to mess with this again. Posted back in march and got varying answers. I bought this tractor from a gentleman that said he quit using it because it just became such a bear to get started even after he replaced the glow plugs. Found on a Red Power forum that engine won't run if return line is pluged. Remove line from pump, and sure enough, I could not blow through line. Thought I found the problem. So I put a hose barb on pump and ran a line into a bucket. Still won't run. I pulled all glow plugs and when cranking engine over, I get diesel vapor and air out of glow plug holes. However, when glow plugs are in, I do not get white smoke out of exhaust. I have a good running 560 diesel to compare it to, and when it cranks over before starting, I get white smoke out the exhaust. Where do I go from here? I can't pull start since it's a hydro. How do I check compression on this engine before I spend hundreds on a pump rebuild if that is what is needed? Tractor seems to be in awfully good shape considering tach shows over 8000 hours. However tach goes to 3000 rpm with a 2700 rpm pto, so I'm not sure the tach is origional. Wheels and tires and paint are not origional. I though the late 656 diesels were governed to 2300. Any advice would be greatly appreciated!

Was the return line plugged with coffee ground likr crap?

I actually have not cleaned the line. Currently it is just dumping into a bucket via a rubber line.

are you sure all the glow plugs work? is the switch and wiring in good shape? i don't think you'll even get smoke without glow plugs

I don't think it's indicating a 2700 rpm PTO, I think it's telling you at 2700 motor rpms you get rated PTO speed whether it be 540 or 1000

Yes, that is what I meant.

On my 560, if I crank it over with or without the use of the glow plugs, it will put out white smoke until it is running.

Crack an injector line up at the injector, and see if your getting fuel, If you have a 560 d then you know that these 282's will not start without working glow plugs, and a good battery.

My 560 did something similar, cracked all the lines and was only getting fuel out of some of the cylinders. Ended up taking the pump off and injectors off and taking them to a shop if i remember right three of the injectors needed valves and the pump got rebuilt runs ands pulls great. The midget valves in the injectors can be pricey at times

The engines in the Hydrostatic transmission tractors are set to run at a high rpm that the gear drive tractors.

Low idle: 650 (+\- 25)
High idle: 2580 (+\- 10)
Rated speed: 2300 (+\- 10)
Minimum overload speed: 1600 (+\- 25)