Gov Springs

I purchased a D17 and a 170 Governor Spring from AGCO.
The D17 Spring cost $68.00 and the 170 spring cost only $37.40!
Go figure!
I measured and compared the Spring tensions with an old WC spring!
It only took 8 pounds of pull to expand WC spring 1/4".
It took 20 pounds of pull to expand the D17 spring 1/4".
It took 24 pounds of pull to expand the 170 spring 1/4".
The 170 spring wire diameter is .005" larger than the D17 spring.
Lunker

It does. I recently bought a new 170 spring too, and it isn't correct. That's what happens when you lose the old original Supplier. I replaced my new 170 spring with a used D-17 spring and had less RPM's. That is NOT the way it is/was supposed to be. 170/175 governor weights are LIGHTER than D-17 weights, therefore they take less of a spring to achieve the same top 2000 RPM's. I also ordered two new governor weights for a 170/175 and tried them...then removed them. They are not made to the same specs as they were 20 years ago and are clearly not the same part.

I was so disappointed to spend the $$$$$$$$$$ to buy what I thought was new and correct AC parts and see that the Supplier AGCO uses can't even reproduce things correctly.

agreed

Does anyone know the thickness of the 170 weights by chance.

And I have experienced the same thing recently. It appears that the parts provided by the current Vendor to AGCO isn't anywhere near correct. A correctly tensioned 170 governor spring will run 150 to 200 RPM's LESS than a D-17 spring with standard governor weights. That is a fact that I have known for more than 40 years. I had a Uncle with a 170 and my Dad had a D-17 and I KNOW what differences there were in governors, governor weights and governor springs on these two engines since I was a teenager. The p/n for a 170 spring is 70226785 and is a spring that was used in a WD or WD-45 engine for an extra 100 RPM over stock which makes it 1800 RPM instead of 1700 RPM. This replacement AGCO spring that runs 2400 RPM instead of 1800 RPM should be addressed by AGCO Parts, but doesn't seem to be on their radar screen of things to worry about.

The governor weights for a WC-WD-WD45-D17 and E Gleaner are all the same, EXCEPT for the ramp, which like Mack says, is different on the E combine engine. The model 170-175 governor weight is DIFFERENT and has a different ramp as well. I not only am disappointed in the governor spring replacement parts problem, I also purchased a new set of 170-175 governor weights and while the weight was correct, the RAMP isn't made correctly like it was 30 years ago....Again a Vendor problem !!

Say hello to the Queen for me !!!

Power would be the same at rated RPM, however you are making more power via higher RPM longer till it drops to rated RPM then you are the same.

I always felt there was more to be gained by modifications to the weights than the springs myself. The spring only controls maximum RPM, the ramps and weight configuration allow tuning the governor to perform best within a predetermined RPM range, and if you are not doing this, you are leaving power on the table. This would be the reason why power unit and combine weights differ from tractor weights, the former are meant to operate at a rated RPM, whereas the tractor is expected to perform under a load at various RPM's.