Backhoe old 410d backhoe question about pedals on floor

[410 jd1977]

can anyone tell me what the 2 pedals on floor left side facing backhoe do ? i think its to redirect hydraulic fluid but not sure just bought machine and nothing in book i got with it and its not on other 410s ive had it has the extenderhoe and clamp bucket could have to do with this maybe

 

[jimmysisson]

Is this a two-stick backhoe? If so you are likely correct on your guesses. Don't think JD used pedals for main operations - Case did.
Jim

 

[410 jd1977]

yes 2 levers and also a pedal on floor for extenderhoe for the in out motion. the 2 pedals on floor in question are connected like a 2 lever brake like on most tractors for quick tight turns but with a pivot point to allow when one foot pedal is pressed down it raises other and vise versa but what is it for whats it do when i press it on rt or left pedal ???