The closes frame 300 is actually a late model 140. The 316K is a one year 16 hp single cylinder Kohler with H2 hydraulics and dual brake pedals like the 300. 316K is most like the 300. Steering and hydraulc's are different from 312/314/317. I am not familiar with the 312 so am leaving it out of this conversation.
- Only service parts are listed for 300/316K control valve, no valve part number. Valve may fit 317/314 but I am not sure.
- The hydraulic lever assembly is interchangeable between 140/300 but not on 316K. Control valve linkage will not fit 317/314
- 316K lever assembly should work on 317/314 ... Control valve linkage should be interchangeable between 316K and 317/314
- The front right side oil lines on your 314 are same part number as used on 317 so leave them attached.
- Use 317 left side oil lines. 300/316K will need modification to attach. That is why I say use the 317 parts. They are a bolt in part.
- You can use you 314 brake set up but need some parts from 317. You need the second brake pedal and independent linkage parts.
If you have baby size fingers it is a simple conversion. Most difficult part of the conversion is replacing the H1 control valve with the H2 valve. Very small and confined area. I will offer a precaution. Make sure the H2 valve you will be using is not bound up and non-functional. Especially the detented spool. You can remove the spool and clean the parts. That is best way to confirm it will work since you have the valve out and laying on your work bench.
When you get into the project don't be timid about asking questions. That is what the membership is supposed to do ... help each other out.
A couple photos of my 314.
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