speed limit under load

hello everyone,

I have a question about the inline fuel injection pump.
Here's the problem: I have an old MAN engine with a mechanical inline fuel injection pump. I want to attach an agricultural device (a corn mill) to this engine. The engine should run at approximately 1700 rpm for the mill, but the engine's rated speed is around 2200 rpm. This means I'm constantly having to adjust the throttle to manage the load and idle speed.
Here's the translation:

'My question is this: If I adjust the governor's flyweight springs to a 1700 RPM speed limit and don't change anything on the pump piston, then, when I give it full throttle, the engine speed should be regulated to 1700 RPM without a load, even though the control rod would allow for a higher speed. If the engine is running at 1700 RPM without a load, even though it could run faster, then shouldn't the full-throttle control allow for a speed adjustment under load to also be 1700 RPM? Or not?'
I would be very grateful for any advice!

Best regards,

alRix

P.S.: I'm looking for wiring diagrams for Caterpillar construction equipment, regardless of the year or model, and I'm willing to pay for them.

Hello alRix:

Quote:

My question is: if I adjust the springs of the flyweights in the speed regulator to a 1700 rpm setpoint and don't change anything on the pump piston, then, when I give it full throttle, the engine speed should be regulated to 1700 rpm without load, even though the control rod would allow for a higher speed. If the engine is running at 1700 rpm without load, even though it could run faster, then shouldn't the full throttle control allow for a speed adjustment under load to exactly 1700 rpm, or not???

In principle, this should work. However, in the worst-case scenario, the controller may start oscillating if it becomes unstable or marginally stable. It depends on the natural frequency of the controller and the natural frequency of the system consisting of the motor and the connected load.
It's definitely worth a try!

Good luck! Let me know how it goes! If the controller starts oscillating, the system can still be stabilized through targeted measures.

Regards,
Alex.

'Thanks for the tip, but I still have a question. What do you mean by 'the regulator starts to oscillate'? Are you suggesting that the regulator's natural frequency might be around 1700 rpm (or the corresponding speed equivalent of the pump at 1700 rpm of the engine)? If so, how would that affect things, and more importantly, what can I do about it?'
The next problem will be to adjust the regulator itself to 1700 rpm, and also to adjust both halves as evenly as possible. I'll probably have to have the Bosch service do that. Or, I'll ask my old vocational school teacher, if he hasn't retired yet...

Thank you again.
Best regards,

alRix