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Tool Talk Discussion Forum

Hyd. pump shaft splined vs keyed

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markiz41

08-13-2007 19:03:35




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Is there any significant difference in performance? Durability? Limits on horsepower? Since I'm replacing both the pump and the crankshaft adapter that drives it, I thought I would not limit myself to just the spline drive in my hunt for a good deal. Thanks for any info.




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Mike M

08-14-2007 06:23:03




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 Re: Hyd. pump shaft splined vs keyed in reply to markiz41, 08-13-2007 19:03:35  
Splines are nice ,but when they wear out your done ! But a new key is a cheap fix if worn.



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J Schwiebert

08-13-2007 20:07:25




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 Re: Hyd. pump shaft splined vs keyed in reply to markiz41, 08-13-2007 19:03:35  
O. K. Different applications have advantages for each. The torque capacity is the same. Fretting Corossion can be a problem with splines. Either way you need to provide for a slip joint and if you don't dig in the dirt too much, a way of lubricating the splines. As far as Old and his statement on the dump trucks that idea is going away because too much chance of an accident with an unguarded shaft. What size pump are you talking about and what options do you have for spline sizes?

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markiz41

08-14-2007 06:18:36




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 Re: Hyd. pump shaft splined vs keyed in reply to J Schwiebert, 08-13-2007 20:07:25  
J, forgot to say.

Both shafts are 7/8, engine puts out 40 horses. Thanks.

When we solve this problem, let's talk pto mounting options :)



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J Schwiebert

08-14-2007 19:25:37




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 Re: Hyd. pump shaft splined vs keyed in reply to markiz41, 08-14-2007 06:18:36  
Somehow I need to contact you.



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markiz41

08-15-2007 05:11:42




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 Re: Hyd. pump shaft splined vs keyed in reply to J Schwiebert, 08-14-2007 19:25:37  
J,

[email protected]

And thank you.



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markiz41

08-14-2007 06:12:28




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 Re: Hyd. pump shaft splined vs keyed in reply to J Schwiebert, 08-13-2007 20:07:25  
The old pump is 2.7 cu in, splined. The splines wore out on the pump shaft and got totally ground off on the female driver. To replace the old set up with the same thing - $500. But I got a line on a 2.6 in3 pump with a keyed shaft for a lot less. A keyed crankshaft adapter will probably have to be custom made (as opposed to just gettin' an OEM splined adapter from dealer). As long as it's safe and reliable, I'm willin to consider the option.

And thanks for your help, fellas.

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old

08-13-2007 21:59:33




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 Re: Hyd. pump shaft splined vs keyed in reply to J Schwiebert, 08-13-2007 20:07:25  
Hey J when was the last time you looked at a PTO shaft on a dump truck?? I have yet to ever see one that wasn't out where a rock etc couldn't hit them. Yep BTDT and have seen a good many of them bent from a rock etc and 90% of them are out in the open even more then on a tractor. Yep retired from dump trucking in some of the worst place you could ever think about driveing like in places where if you missed by 6 inches you and the truck went for a swim

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J Schwiebert

08-14-2007 05:04:54




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 Re: Hyd. pump shaft splined vs keyed in reply to old, 08-13-2007 21:59:33  
Rich: The trend is toward the direct mounted pump. I used to work for Chelsa PTO's. The idea is liability people craw under ther and then get caught. There were some vary serious meetings where shields were to be required on dump truck and other under the truck hydraulics. One of the gals that worked for us in the office had some of her relation killed by a PTO shaft on a truck. It can and does happen and leads to big law suits. Send me an address and I will even send you more information. That is why newer trucks that need a driveshaft have all those safety decals Also by law if the truck is drive shaft equipped for a PTO it is recommended that dangers be explained to the owner. J.

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old

08-14-2007 07:44:57




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 Re: Hyd. pump shaft splined vs keyed in reply to J Schwiebert, 08-14-2007 05:04:54  
I understand the safety problem but I also know most trucks, the older one in this are have the PO shaft right out in the open and yep they cause problems not only with hooking something like rocks but also people etc. But that wasn't what he was asking. I know I sure would like to find something better for a tractor hyd pump drive then the spline type shafts beause the splines wear out an cause problems.

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old

08-13-2007 19:14:22




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 Re: Hyd. pump shaft splined vs keyed in reply to markiz41, 08-13-2007 19:03:35  
I have found the spline type wear out after a few years and then its another $50-75 to fix them. I have wanted to try some thing else my self but haven't got around to it yet. I have been thinking about a shaft set up like used on dump trucks that have U joints and keyed shafts



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