internal vs external hydraulic lift cylinders

   / internal vs external hydraulic lift cylinders #1  

4tillingdirt

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Oct 18, 2013
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I think the external has a capacity advantage and easier to work on obviously but would a tractor having internal hydraulic lift cylinders dissuade anyone from buying a tractor?
 
   / internal vs external hydraulic lift cylinders #2  
Are you refering to the 3ph?
 
   / internal vs external hydraulic lift cylinders
  • Thread Starter
#3  
Yes. I noticed that Kioti and Kubota tend to have external cylinders.
 
   / internal vs external hydraulic lift cylinders #4  
I own 2 tractors with internal 3 pt cylinders & 1 with external cylinders. I've owned my '91 JD 4255(120 HP) with internal single cylinder with 6175# lift capacity that's never required any repair. My '11 Kubota M7040(70 HP) has dual external cylinders with 4200#s lift. My '80 Ford 6700(75 HP) with single internal cylinder has 4040#s lift Neither type has given any problems. Lift capacity is determined by several factors such as system hyd pressure,diameter of cylinder or cylinders & design of linkage.
 
   / internal vs external hydraulic lift cylinders #5  
Neither would bother me.

On bigger tractors....quite a few of them seem to go external now. Smaller tractors seem to still be internal. They both work fine
 
   / internal vs external hydraulic lift cylinders #6  
If anything, the external ones are much easier to pull off and repair. On the other hand, they are a bit exposed to the elements but not that big of a deal.

I think one of the reasons for the external cylinders is that gives the manufacturers a lot more room under the seat, specially with cabbed tractors. They can use a smaller valve mounted on the side with the position feedback linkage easily attached to it and to the rocker arm, instead of the bigger rockshaft and cylinder assembly.
 

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