318 Charge Check Valve? - MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information
John Deere Forum John Deere Garden Tractor talk

 
LinkBack Thread Tools Display Modes
post #1 of 7 Old 10-01-2019, 10:32 PM Thread Starter
MTF Member
 
Join Date: Aug 2017
Posts: 57
318 Charge Check Valve?

Hello
Can someone explain how the Charge Check Valve on a Sauer Danfoss 15 series U Type tranny works? I checked mine out and they both were pushed down. I took them out cleaned them but I had to manually push the pin up and down. Seems like the spring inside is not automatically pushing the pin up. Is the spring inside supposed to automatically push the pin up, or does pressure from the dydro supposed to push it?
They both seemed sticky and stuck.
It does not seem to come apart for repair or cleaning.
Thank you
peksav44 is offline  
Sponsored Links
Advertisement
 
post #2 of 7 Old 10-01-2019, 11:27 PM
Super Moderator

 
mrbeef's Avatar
 
Join Date: Jul 2012
Location: South Dakota
Posts: 13,138
Barn
Re: 318 Charge Check Valve?

The pressure from the pump will push them up if they are stuck down.

Was something wrong with them to prompt the cleaning/desire to rebuild?

The true test of skill is when you can put something back together and it works... not the dusty half disassembled pile of junk in the corner....

Tractors:
'17 JD 4066R, '08 JD 1445, '07 JD X748, '88 JD 318,'83 JD 214, '74 JD 140, '69 JD 140, 60's Power King, '57 JD 820

The Round Fenders: '67 JD 112H, '67 JD 112H, '67 JD 110H "The Frog", '67 JD 110, '66 JD 110, '65 JD 110, '64 JD 110
Former Machines:
60's Power King, '64 JD 110, '65 JD 110, '65 JD 110, '66 JD 60, '66 JD 110, '66 JD 110, '66 JD 110H, '66 JD 110H, '67 JD 112, '67 JD 112, '69 JD 112, '69 JD 140H3, '69 JD 140H3, '70 JD 112, '72 140 H1, '77 JD 212, '79 JD 212, '80 JD 317, '80 JD 317, '80 JD 317, uk Cushman 898807, '83 JD 318, '84 420, '86 JD 318, '86 JD 420, '87 JD 430, '87 JD 318, '88 JD 318, '88 JD 318, '88 JD 855, '89 JD 318, '90 JD 318, '91 JD 430, uk Cab Cadet 2140, '92 JD 320, '93 JD 320, '96 JD 445, '98 JD 425, '99 JD 3215A, '00 Sabre 2046, '01 JD 455, and '01 LX277


Want to watch a guy fumble through a project where he has no clue what might be next......
Kohler Light Plant

mrbeef is offline  
post #3 of 7 Old 10-02-2019, 02:18 AM
Senior MTF Member
 
Join Date: Aug 2018
Location: Tennessee
Posts: 395
Re: 318 Charge Check Valve?

Pek, A little over a year ago, the check valves on my 317 were sitting in a puddle of oil. Deere wanted $147 each so I looked around online. I found places that rebuilt them and places that sold new ones. I found LJ Fluid Power in Delton, MI. (269) 623-4150 that supplied 2 new valves for $140. A quick phone call, and 3 days later I had new valves installed! Bob
rwmeyer is offline  
Sponsored Links
Advertisement
 
post #4 of 7 Old 10-02-2019, 07:57 AM Thread Starter
MTF Member
 
Join Date: Aug 2017
Posts: 57
Re: 318 Charge Check Valve?

Thank you for info and Thanks for asking
318 runs fine until it gets hot. Then it either starts off slow then speeds up and/or with the control rod all the way forward it still is not full speed or is difficult to go up small hills. The linkage does have very little play and I will tighten that up on the S shaped control rod. I found there is play at the top of the shock absorber #11, in the bracket #12, and the arm #23 where pin goes through, the hole got bigger.
Since I was messing with that I also decided to replace my disintegrating fuel lines and tranny fluid level site tube hoses, and pump filter.
But I thought I mind as well check the charge check valves and charge relief valves. I don't know enough about either to know if the are working properly, so I was just going to replace them. But they cost more that I expected.
I also thought it could be the charge pump too but lots of $$ for rebuild parts.
I'm kind of going through process of elimination.
peksav44 is offline  
post #5 of 7 Old 10-02-2019, 08:55 AM
Senior MTF Member
 
Join Date: Aug 2018
Location: Tennessee
Posts: 395
Re: 318 Charge Check Valve?

Pek, The check valve need to do 2 things: NOT leak, and pop up when the engine/hydro runs. With seat pan removed, start tractor, warm for 2-5 minutes, and shut down. Move free wheeling lever to depress valves and then raise up to "storage" position. Start tractor and watch valves, they should pop up...no need to move hydro Frd/Rev lever.

Charge relief valve is actually for your hydraulic control levers for moving attachments. A pressure gauge can be installed in a front hydraulic outlet. Moving your lever should give a reading, ~around(??)~ 900 psi I believe. If you've got that, your fine.

After repairing/replacing site tube asm, drain oil, replace filter, and refill oil. I'd recommend JD Hy-Guard or Lo Vis, depending on temps where you live. You may find that your slowing down when hot went away!

One more! While your replacing fuel line components, pull hoses from fuel tank. You should have a filter or screen on the end of the tubes...clean or replace. Bob
rwmeyer is offline  
post #6 of 7 Old 10-07-2019, 01:01 AM Thread Starter
MTF Member
 
Join Date: Aug 2017
Posts: 57
Re: 318 Charge Check Valve?

Good advise
I found in tank fuel filter had a hole in it and the grommets where fuel lines enter tank were cracked and leaking..
replaced hydro fluid, filter and cleaned both check valves and replace it's o rings.
i will advise on status after start and bleed off air.
peksav44 is offline  
post #7 of 7 Old 10-07-2019, 09:08 PM Thread Starter
MTF Member
 
Join Date: Aug 2017
Posts: 57
Re: 318 Charge Check Valve?

Hello
Got her all put back together and gassed up. Started up ran great, then saw a second hydro leak at charge pump seal-lip.
Time to research how to replace that booger.
I will update
thank you
peksav44 is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the MyTractorForum.com - The Friendliest Tractor Forum and Best Place for Tractor Information forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in











Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome