Go Fast ...

[WHX?? 54,259]

In reverse ... Guy was asking for help the other day on slow reverse on a hydro.  and @Racinbob commented that horses are not supposed to go fast in reverse. Designed that way for safety reasons I suspect. Some new machines including late model Toro verticals had a key switch under the seat with a light on the dash for reverse operation when the blades were spinning. 

So this 520 FEL I have was always a slug in reverse. Didn't matter how the motion linkage (Matt's pedal kit)  was adjusted. Seemed like it took a hour to back away from the gravel pile. The other three 520's in my herd have this issue as well but not as severe and not as aggravating as they are all snow machines and don't see a lot of reverse time it seems.

Since it was in the shop for other work & maintenance something was gonna be done about it. 

Started by marking the full forward and full reverse positions of the motion lever on top of the hydro. To get the control plate to move the lever to go to full forward was obtainable  but only allowed a small amount of lever travel in reverse. 

The problem is the eccentric cam would bottom out in the control plate before the lever reached it's max reverse limit.  

Simple enough to elongate the reverse slot. Took a little more than 1/8" out was all that was needed. The motion lever now hits it's stops in both directions & a full cleaning & lubrication of all linkage makes for a very smooth pedal greasy Pete would be proud of. 

[Tonytoro416 1,300]

Going to have to take a closer look on the work 416. This may be the ticket for it also. Also has a pedal kit installed 

[JoeM 9,507]

5 hours ago, WHX?? said:

Took a little more than 1/8" out was all that was needed

Yep that works.

Just to elaborate on the hydro, the same internal parts that provide forward also are used in reverse. It just the cam ring directs the oil to either forward or reverse from the pump to the motor. It can actually run as fast in reverse as forward. 

 

[squonk 45,265]

I've seen the cam itself wear a groove in it causing the same issue. Not enough pushin for the cushion! 

[Racinbob 12,585]

7 hours ago, WHX?? said:

In reverse ... Guy was asking for help the other day on slow reverse on a hydro.  and @Racinbob commented that horses are not supposed to go fast in reverse.

 

Actually what I was referring to was the lever movement to get it to reverse. Basically the neutral stop. It's no secret that I'm not a hydro fan in any way but that movement drove me nuts. My wife said it really didn't bother her. I did this modification last summer to the 314-H. A mechanical stop on that bracket slot blocking the lever right at the neutral switch. From there it had to be pushed down to get to reverse. It wasn't a smooth movement from F to R. 

 

A little cutting did the trick.

 

My wife told me the movement didn't bother her but when I was done she said she really liked it.

 

As far as the reverse speed, I like the idea here. I would do it but this tractor will end up with a new owner this spring.