Wow...what a ridiculous response. The pictures clearly show the location of the part. The pictures clearly show the broken part. It clearly states the make model and S/n of the machine and the last picture is the identical part on the other side of the machine that is not broken. Anyone can Google.....with photos, the angles they are taken at can make it impossible to know what the person is talking about unless someone has had the identical problem. All I got from the photos was it looks like a bolt is missing and a linkage broke because of it. Put some arrows or a circle or something like that around the issue. Google took me to this site and this series of images for your model https://www.gravely.com/en-us/parts...0&mid=161232&pid=161232&model=991140&lc=false
aahh. That makes sense on why I couldn't find it on the parts diagram. I can look it up from here. Thank you very much for your response!What is the Hydro Gear transaxle model number? With that I can look up the transaxle on Hydro Gear dealer site for the Part Numbers.
And you also missing a return spring.
This is the bent partWow...what a ridiculous response. The pictures clearly show the location of the part. The pictures clearly show the broken part. It clearly states the make model and S/n of the machine and the last picture is the identical part on the other side of the machine that is not broken. Anyone can Google.....

This is the bent part View attachment 73173
Part number 91599 and the spring is part number 51605
I appreciate that. The hydros are commercial ZT 3400. I have attached a pictureI still would prefer the actual transaxle model number as there is CW and CCW version for the ZT3400 series. And springs do come in different strengths.
Edit> Per IPL of the model and serial of the mower the parts are.
LH 71599 RTN CCW
RH 71597 RTN CW
Spring 51605
Don't where IL came up PN 91599 but it is an invalid PN.
You'd be surprised what we run into on here........Anyone can Google.....
Mistype. Have corrected my original post with incorrect numberI still would prefer the actual transaxle model number as there is CW and CCW version for the ZT3400 series. And springs do come in different strengths.
Edit> Per IPL of the model and serial of the mower the parts are.