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Hydra power

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joe

05-19-2003 06:31:37




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When is it appriate to use the drive vs the under drive on a 1850(d). And does the under drive work in all gears




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Mike (WA)

05-19-2003 08:26:38




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 Re: hydra power in reply to joe, 05-19-2003 06:31:37  
In normal operation, you want to use high (direct)- because it is direct drive, and not using any clutches or other wear items in the unit. Use under to slow down temporarily when you hit a heavy spot in baling, or bog down in tillage operations. Other poster was correct about free-wheeling in low. My first "4 digit" was a 1550- I had the guy deliver it to a neigbor's place up the hill (thats the keyword here), which had an unloading ramp. The hill was an exciting initiation for me on the way home.

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Sam M

05-19-2003 08:18:58




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 Re: hydra power in reply to joe, 05-19-2003 06:31:37  
The term hydra power was used by Oliver to describe its 2 speed auxillary drive so I assume that is what you are talking about . I have the hydra power drive on a 1555 and an 1850 . The unit works in all six gears on the 1850 . I use the hydra power drive on my 1850 only once in a while . I may put it in low (knob pulled out ) when starting out pulling a heaving load or when starting out going up a hill . I also use the hydra power unit (going from direct - knob pushed in - to low - knob pulled out ) when I hit a soft spot or bog down plowing or pulling a grain drill . I think the hydra drive lets you go down one gear range ( from direct to low ) without putting in the clutch or shifting gears . The problem with the hydra drive is it free wheels in low (knob pulled out )going down hill . My 1855 has the hydraul over/under shifter (3 speeds in all gears ) which is a lot handier since direct and high do not free wheel going down hill .

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Dean Barker

05-19-2003 19:10:17




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 Re: Re: hydra power in reply to Sam M , 05-19-2003 08:18:58  
Something to think about. Whether you have a hydrapower or an overunder, when your tractor first starts to move, you are in underdrive no matter where your control lever is located. It takes about 10 to 15 feet of movement to build pressure and the trans will shift to where your control lever is located. These are both good dependable auxillary transmissions.



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Ollie

05-20-2003 05:19:54




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 Re: Re: Re: hydra power in reply to Dean Barker, 05-19-2003 19:10:17  
The over/under "Hydraul-Shift" is just a hydraulic transmission, kinda like an automatic with a manual valve body. It cannot shift, it must be shifted manually. It stays in that range (under, 1:1, over) until shifted to another. If you start in "over", that's what it's in. Full pressure is obtained at idle and it needs no time to build-up. Low initial pressure that gets higher with more rpm would tell me to look for a low fluid level, contaminated fluid, or a partially clogged filter.

I agree completely about dependability.

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Dean Barker

05-23-2003 21:27:46




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 Re: Re: Re: Re: hydra power in reply to Ollie, 05-20-2003 05:19:54  
Hook a pressure gauge to either one of the pressure ports on your over/under, Ollie, and I think you will see what I mean.



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