Jump to content

Garden Tractors and Parts on eBay



Photo
- - - - -

sunstrand charge pump check


  • Please log in to reply
26 replies to this topic

#1 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 04, 2018 - 10:01 AM

got the proper gauge and re-rested pressure- good  pressure at 120 psi- but when I dead head the aux. hydraulics- the pressure jumps up a little bit- then drops back down- I already replaced the implement relief valve-spring ect. tough one to diagnose

Attached Thumbnails

  • SDC13918.JPG

  • boyscout862, Sawdust and Mark 149 J. have said thanks

#2 boyscout862 ONLINE  

boyscout862
  • Senior Member
  • Contributor
  • Member No: 8923
  • 12,570 Thanks
  • 9,050 posts
  • Location: N.E. Connecticut

Posted January 04, 2018 - 10:50 AM

Did you run all of the tests in the series?

#3 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 04, 2018 - 12:07 PM

did you mean the hi pressure- which I think is for the acceleration valves? did not do that one- but I tested the drive to the whels- by bumping the bucket against the foundation- dug it right down seems to have good drive power- thank you for your input really want to eliminate everything I can before removing the hydro -



#4 KennyP OFFLINE  

KennyP

    FORDoholic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2253
  • 37,551 Thanks
  • 45,533 posts
  • Location: Collinsville, Oklahoma

Posted January 04, 2018 - 01:19 PM

I have no idea about this machine, but does the lift valve have a relief adjustment? It may have backed out and won't let it build pressure! Or maybe the lift valve needs rebuilt!



#5 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 04, 2018 - 02:07 PM

thank you for your thoughts- my machine- an Bolens HT-20 - does not have adjustable control valve. it has a charge relief and implement relief valve internal to the hydro. although I did remove it and replaced the o rings- just to eliminate that possibility


  • KennyP said thank you

#6 KennyP OFFLINE  

KennyP

    FORDoholic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2253
  • 37,551 Thanks
  • 45,533 posts
  • Location: Collinsville, Oklahoma

Posted January 04, 2018 - 02:15 PM

I know nothing about Bolens, but it was a thought!



#7 HowardsMF155 OFFLINE  

HowardsMF155

    Tractorholic

  • Senior Member
  • Member No: 4243
  • 2,841 Thanks
  • 2,979 posts
  • Location: Central NC

Posted January 04, 2018 - 04:32 PM

Are you running the machine at WoT or whatever throttle position is recommended?



#8 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 04, 2018 - 07:19 PM

hi Howard- yes- wot I get the 120 to 125 psi reading- when at about 1/4 throttle I get around 75 psi - I just cannot figure out why if I have the specified pressure coming from the charge pump -why the power steering will not have much power- when I take the bracker off the frame and operate the steering wheel the cylinder movers in and out- and my lift cylinder looks like it is slow also- and when I dead head the cylinder it should jump to around 550 to 800 psi according to the manual-- i.e. implement relief pressure- but mine jumps up about 10 psi then drops back - it should have been as simple as replacing the implement relief valve-


  • Mark 149 J. said thank you

#9 chieffan ONLINE  

chieffan
  • Senior Member
  • Contributor
  • Member No: 62695
  • 9,623 Thanks
  • 6,434 posts
  • Location: SW Iowa

Posted January 04, 2018 - 08:40 PM

I still think it is the cylinder seals.  If they are bad it would not build pressure due to the by passing of fluid in the cylinder.


  • Mark 149 J. said thank you

#10 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 05, 2018 - 06:36 AM

wow chieffan -you have quite a herd their! I was hoping that was it too- but after I replaced the o rings in the control valve- and I have the spools centered- still cannot get the relief pressure to build- my tractor has dual hydraulic aux. ports also- and  I use that to dead head the system still will not build implement relief pressure- maybe today I will take the hoses off the lift cylinder and connect together and just to see thanks for you input



#11 Alc OFFLINE  

Alc

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 1094
  • 6,751 Thanks
  • 7,399 posts
  • Location: Bangor Pa

Posted January 05, 2018 - 06:49 AM

This is just a long shot but since this tractor has an unknown past could the relief valves be switched ?  I might not even be possible I'm just throwing it out there

 

Attached Thumbnails

  • pump.gif

  • Mark 149 J. said thank you

#12 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 05, 2018 - 07:20 AM

I did replace the implement relief with all new parts- however I did not replace the charge relief- I do see the spring in the charge relief is a heck of lot weaker or softer than the implement relief- I wonder if I have the correct spring? thanks for the heads up alc!


  • KennyP and Mark 149 J. have said thanks

#13 KennyP OFFLINE  

KennyP

    FORDoholic

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2253
  • 37,551 Thanks
  • 45,533 posts
  • Location: Collinsville, Oklahoma

Posted January 05, 2018 - 08:16 AM

That might just be the issue!


  • Mark 149 J. said thank you

#14 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 05, 2018 - 08:59 AM

first thing I will do is replace that charge relief spring- also want to do the aux leak test


  • Mark 149 J. said thank you

#15 BOLENSBOY60 OFFLINE  

BOLENSBOY60
  • Member
  • Member No: 33108
  • 40 Thanks
  • 47 posts
  • Location: wisc

Posted January 05, 2018 - 02:17 PM

I swapped the charge relief spring- no luck -I drained the fluid- this looked a lot darker and thicker than type F after new filter and fluid- I have zero charge pressure- nothing- I filld the pick up line- filled the new filter andremoved the plugs and rotated the engine like the book says- nothing- maybe someone put thick fluid in their to compensate for wear?


  • Mark 149 J. said thank you




Top