Yesterday's Tractor Co. Low Prices, Parts Ship Fast!
Click Here or call 800-853-2651 
   Allis Chalmers Case Farmall IH Ford 8N,9N,2N Ford
   Ferguson John Deere Massey Ferguson Minn. Moline Oliver
 
Marketplace
Tractor Manuals
Tractor Parts
Classified Ads
Photo Ads

Community
Discussion Forums
Project Journals
Tractor Town
Your Stories
Show & Pull Guide
Events Calendar
Hauling Schedule

Galleries
Tractor Photos
Implement Photos
Vintage Photos
Help Identify
Parts & Pieces
Stuck & Troubled
Vintage Ads
Community Album
Photo Ad Archives

Research & Info
Articles
Tractor Registry
Tip of the Day
Safety Cartoons
Tractor Values
Serial Numbers
Tune-Up Guide
Paint Codes
List Prices
Production Nbrs
Tune-Up Specs
Torque Values
3-Point Specs
Glossary

Miscellaneous
Tractor Games
Just For Kids
Virtual Show
Museum Guide
Memorial Page
Feedback Form

Yesterday's Tractors Facebook Page

Related Sites
Tractor Shed
TractorLinks.com
Ford 8N/9N Club
Today's Tractors
Garden Tractors
Classic Trucks
Kountry Life
Enter your email address to receive our newsletter!

subscribe
unsubscribe
  
Tool Talk Discussion Forum

Re: Looking for hydraulic advice

[Show Entire Topic]  

Author  [Modern View]
NCWayne

12-03-2012 21:33:46
69.40.232.132



Report to Moderator

OK, looked at the pics, and read everything. Making some assumptiuons here about the pump in that the actual 3.7 GPM rating is at 1000 RPM. making those assumptions here's my next observations and suggestions.

Looking at the pic you've got the sprocket sizes backwards (ie the larger one on the engine and the smaller on the pump) so your actually speeding up the pump. That said I'd think you'd want to run the engine well above an idle so it has power to dump the trailer when it's loaded and the highest hydraulic pressure is needed. To do that requires nothing more than some simple math. If you want to run the engine at 2000 RPM and the pump at 1000 then you need two sprockets with one having twice as many teeth as the other. This would turn the pump at 1000 RPM and, assuming the 3.7 gallons is at 1000 RPM, would net you right at 3.7 gallons of flow.

Now, to slow the pump down, and reduce your flow, all you need to do is use spockets with an even larger tooth count difference. If you were to put a 25 tooth sprocket on the engine and a 5 tooth sprocket on the pump with the engine at 2000 RPM the pump would turn at one fifth of it's usual speed, or 200 RPM. This, in theory, would give you a pump flow of about .7 GPM. If that isn't enough flow you can go with say a 20 tooth sprocket and a 5 tooth sprocket. This would change to the ratio to 4-to-1 which would turn the pump at 250 RPM and give you a flow of .925 GPM. Using the 4 to one ratio if you sped the engine up to 3600 RPM than it would give you a pump speed of 900 RPM, and should give you a flow of about 3.33 GPM. By the same token with the engine at 2000 RPM it would also allow you to slow the engine down some and reduce the flow from the pump wto well under a gallon a minute.

That all said, for the cost of two sprockets you should be able to get your flow rate down low enough to meet your needs and still keep the engine at a high enough RPM for the engine to do it's job properly, and also give you wome wiggle room to control the flow with the throttle to nearly it's maximum. That's a close estimate on taking care of the problem using just two different sprickets. Beyond that you can play with sprocket sizes, if you want, to achieve the optimal engine speed and flow rate compatible with your needs.

Granted I understand your wanting to make the thing using all parts you have lying around, BTDT many times myself. Unfortunately there are times when it is cheaper and easier to buy the critical parts needed to make the thing RIGHT, than it is to use will fit parts and then have to buy another, more expensive part, to make sure the will fits actually do fit. Good luck.

[Reply]   [No Email]
Fawteen

12-04-2012 02:59:49
72.65.109.142



Report to Moderator
 Re: Looking for hydraulic advice in reply to NCWayne, 12-03-2012 21:33:46  
Well, yes, but...

The engine has an integral gearbox that produces 650 RPM at WOT. Not having any experience to go by, I was concerned about being able to turn the pump at it's rated speed of 1000 RPM, so I went with an 18 on the engine and a 12 on the pump, which according to my math should turn the pump at 975 with the engine at WOT.

Obviously, that's MUCH too fast, but even with the engine at idle (I haven't put my tach on it to see what that is) it's too much flow.

I will be re-gearing, but I have another solution in mind that I'm going to try this morning. If it works, I'll post the details.

[Reply]  [No Email]
PJH

12-04-2012 08:04:03
50.40.254.174



Report to Moderator
 Re: Looking for hydraulic advice in reply to Fawteen, 12-04-2012 02:59:49  
Sorry Fawteen - I failed to read that your engine had a gear reduction.

Paul



[Reply]  [No Email]
[Show Entire Topic]     [Options]  [Printer Friendly]  [Posting Help]  [Return to Forum]   [Add a Reply]

Hop to:
TRACTOR   PARTS TRACTOR   MANUALS
Same-Day Shipping! Most of our stocked parts ship the same day you order (M-F).  Expedited shipping available, just call!  Most prices for parts and manuals are below our competitors.  Compare our super low shipping rates!  We have the parts you need to repair your tractor.  We are a Company you can trust and have generous return policies!   Shop Online Today or call our friendly sales staff toll free (800) 853-2651. [ More Info ]

Home  |  Forums


Copyright © 1997-2014 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy

TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters