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nmassey02

Faster hydrostatic rear ends

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nmassey02

Hey guys, what rear ends were the higher geared ones? We have one 520 that had a rear end replaced and it is a lot faster than the other. As far as I have been informed, 520hc's and 417's. Where there any others? How many teeth are there on the high speed gears versus the regular gears?

 

Thanks! 

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varosd

others will chime in but correct on the short lived 88-89 520 HC with the faster Eaton 1100 read end and of course the newer 520's

also the GT 1848 Workhorse had a bigger gear in the rear.

other models probably

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JackC

The faster 520 likely has a 520HC tranny. I believe the 418C and some of the C's as well as the newer 5xi series are also some of the faster horses in the herd. Not sure why ground speed was reduced for some of the later pre 5xi tractors but safety and liability concerns may have been a factor. The sales brochures for various years provide the ground speed numbers.

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shallowwatersailor

Jack is correct as Toro developed the "Smart Steer" for the 5xi. It was needed with four of the five 5xi models equipped with cruise control. Imagine a typical owner clipping along mowing at 7.5 mph and then cranking the wheel over to turn! A ROPS bar was optional. Toro offers a bypass kit (Smart Steer control is through an additional cam and linkage) as they are slooow in Reverse when in "Lo" and turning. But I have found with three 5xi that it actually allows some finesse when backing into the garage.

 

One thing I wonder: If the kit was installed by a dealer, did they then disable the cruise control to protect liability?

 

 

Edited by shallowwatersailor
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Jerry77

I read somewhere that the 418A had a faster rear end.....does anyone know for a fact?  :)

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nmassey02

That's for the replys guys! Would any one know the exact tooth count difference on the drive gear on the eaton as well as the difference in the number of teeth in the rear end? 

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cleat

This should help.

Rear end.pdf

 

Cleat

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nmassey02
2 hours ago, cleat said:

This should help.

Rear end.pdf

 

Cleat

Awesome thanks! 

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lynnmor

I've not played with it, but is there anything to gain by changing the cam profile?  Perhaps it does move as far as possible with the stock profile.

 

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nmassey02

Would you happen to have the parts list for the gear from the hydraulic pump? Thanks!!

2 minutes ago, lynnmor said:

I've not played with it, but is there anything to gain by changing the cam profile?  Perhaps it does move as far as possible with the stock profile.

 

Thats a good question, I'm not sure. My original thinking was to spin the pump fast, but at some point the relief valve will kick in and more rpms will not help any more.

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cleat

Here is the hydro gear parts.

 

hydro.pdf

 

Here is the exploded view of the entire hydro unit.

 

hydro parts.pdf

 

Cleat

Edited by cleat

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nmassey02
1 hour ago, cleat said:

Here is the hydro gear parts.

 

hydro.pdf

 

Here is the exploded view of the entire hydro unit.

 

hydro parts.pdf

 

Cleat

Thanks! So the 520 pump gear has 20 teeth and the 520 hc has 22 teeth, this is the opposite of what I thought it would have been. 

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nmassey02
On 12/31/2016 at 10:22 AM, cleat said:

Here is the hydro gear parts.

 

hydro.pdf

 

Here is the exploded view of the entire hydro unit.

 

hydro parts.pdf

 

Cleat

Would the same part number pdf's be available for the 8 speed rear end in a c100-8 & a 310-8? I found the repair manuals on this website, but I could not find a indepth part number break down for those rear ends. Thanks! 

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