DTM124 Posted August 25, 2021 Share Posted August 25, 2021 With 4 shims installed on the pto control valve I can only get 30 psi of feathering pressure. Can I add an additional 3 more to get to the 45 psi needed? Quote Link to comment Share on other sites More sharing options...
CIHTECH Posted August 25, 2021 Share Posted August 25, 2021 What is your "full on" pressure reading? Did you have unit out for servicing it and trying to set pressure or are you just checking pressure due to a problem? You may have an internal leak you are attempting to overcome that is dropping your pressure. Quote Link to comment Share on other sites More sharing options...
mrfred54 Posted August 25, 2021 Share Posted August 25, 2021 Need more info. What are you trying to do, what's the problem that your trying to set the feathering pressure?? Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 25, 2021 Author Share Posted August 25, 2021 I made a new upper control valve shaft (due to corrosion) and installed it. I am trying to reset all pressures including the feathering pressure. I can get my operating pressure set at 235 psi without a problem. I just can’t get my feathering pressure set to 41-46 psi with 4 shims. i never had a problem with slippage, pto worked fine Quote Link to comment Share on other sites More sharing options...
Sparky Posted August 25, 2021 Share Posted August 25, 2021 You can still buy a new control spool for those so that you don't have to make one, btw. Also, set your operating pressure at 275. Travis Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 25, 2021 Author Share Posted August 25, 2021 I added 4 more shims and it doesn’t increase the pressure, the only way to get to 46 psi is to loosen the seal gland some so the shaft can lift more Quote Link to comment Share on other sites More sharing options...
snoshoe Posted August 25, 2021 Share Posted August 25, 2021 Well this has had me wondering. First post I wondered if Teflon seal had been shaved. Then it was what dimension of spool is incorrect. This last post I'm thinking what is assembled wrong. Then I think that's impossible. Lifting same spool for start and engaged. Then I realized I misunderstood. Come up with this question. Which side of cup are you placing shims? Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 25, 2021 Author Share Posted August 25, 2021 Shims installed below the cup, spring sits inside of cup, the new shaft’s dimensions are exactly as the original shaft. Added an additional .125” shim and the pressure increased by only 5 psi, max. 35 psi Quote Link to comment Share on other sites More sharing options...
Sparky Posted August 25, 2021 Share Posted August 25, 2021 1 hour ago, DTM124 said: Shims installed below the cup, spring sits inside of cup, the new shaft’s dimensions are exactly as the original shaft. Added an additional .125” shim and the pressure increased by only 5 psi, max. 35 psi Spring does NOT sit inside of the cup. Assemble as in this pic... Hope this helps. Travis 1 Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 25, 2021 Author Share Posted August 25, 2021 Will switch it around and see what happens. Thanks for your help , appreciate it Quote Link to comment Share on other sites More sharing options...
Sparky Posted August 25, 2021 Share Posted August 25, 2021 1 hour ago, DTM124 said: Will switch it around and see what happens. Thanks for your help , appreciate it I'm not sure if it will, or even if it could make a difference in your pressure, but I'm definitely curious if it does. Have seen a few come through the shop with that cup installed upside down. Travis Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 26, 2021 Author Share Posted August 26, 2021 Installed the spring retainer cup as mentioned in Sparky’s pic and featuring pressure climbed to 50 psi with 4 shims, removal of shims increased pressure. Final pressure left as follows: Featuring psi = 50 High idle psi = 250 Low Idle psi = 200 2 IH techs told me the cup went open end up, it came out my pto open end up, but the IT manual illustrates it to be open end down, but I was reluctant to change it bc the spring was so close to the gland Thanks again for the information, and taking time out of your day to respond to my inquiry, greatly appreciated!! 1 1 Quote Link to comment Share on other sites More sharing options...
ky966boy Posted August 27, 2021 Share Posted August 27, 2021 On 8/25/2021 at 3:02 PM, Sparky said: Spring does NOT sit inside of the cup. Assemble as in this pic... Hope this helps. Travis If I would have been putting that together from scratch I would put cup wrong . Quote Link to comment Share on other sites More sharing options...
stronger800 Posted August 27, 2021 Share Posted August 27, 2021 Me too Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 27, 2021 Author Share Posted August 27, 2021 What a difference it makes when installed correctly. My buddy made a shaft out of 17-4 stainless steel so it should last a long time without any corrosion on the shaft Again thank you all, great forum, great people!!!! Quote Link to comment Share on other sites More sharing options...
stronger800 Posted August 27, 2021 Share Posted August 27, 2021 Glad you got it, but, it must have been working previously with it installed incorrectly, right? And it sounds like lots of guys have put them together wrong, and they must have worked too. Yet yours wouldn’t. Can one of you guys that understand better, give us a quick description of how that works? Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 27, 2021 Author Share Posted August 27, 2021 It does work installed incorrectly, but will not reach the desired pressure required by the manufacturer. Open end down position let’s the shaft lift more thus increasing pressure. As stated before there are 3 pressure requirements on a dual speed pto for it to function satisfactory, evidently the high idle pressure is the most critical for the clutches not to slip. Some mechanics never set the feathering pressure, only the high idle pressure. Just tried to make mine last as long as possible Each shim measures .042” thickness 1 Quote Link to comment Share on other sites More sharing options...
Sparky Posted August 27, 2021 Share Posted August 27, 2021 38 minutes ago, DTM124 said: It does work installed incorrectly, but will not reach the desired pressure required by the manufacturer. Open end down position let’s the shaft lift more thus increasing pressure. As stated before there are 3 pressure requirements on a dual speed pto for it to function satisfactory, evidently the high idle pressure is the most critical for the clutches not to slip. Some mechanics never set the feathering pressure, only the high idle pressure. Just tried to make mine last as long as possible Each shim measures .042” thickness Sounds like you've taken the time to understand it. Good job. Too many people don't. Travis Quote Link to comment Share on other sites More sharing options...
DTM124 Posted August 27, 2021 Author Share Posted August 27, 2021 Bugs me when I don’t understand how things function! Anything! Really bugs me when I don’t figure it out myself! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.