2120 SCV Adjustment

[nokiddin]

Hi there.

I was hoping someone might be able to tell me the proper way to adjust the SCV on my 2120.

The story is that the lever suddenly felt like it wasn't engaging anything, so I pulled the top cap off, and seeing the 4 adjustment bolts, took them off thinking I might be able to get further into the unit to see what was wrong. I now realize my mistake and wish I did some research first.

Turns out the problem is a broken roll pin.

When I removed the adjustment bolts, two of them broke, and they must have been mostly broken before I touched them as it barely took any force. So I will need to replace at least two of them.

The other thing is, in mine, they are a short threaded rod with a nut on. There is no slot or Allen key for adjustment, so I'm wondering if there is a different way to set it up? All I have found discusses doing 1/8 or 1/4 turns, which seems hard to do accurately, with no slots in the bolts etc.

Lastly, with no slots in the bolts, can I just make my own replacements out of a 1/4 bolt and not, cut to the right size?

Thanks in advance for the help.

 

[Tx Jim]

Factory valve adjusting screws had hex(Allen) recess in each screw. Valve clearances are not easily adjusted for the inexperienced person. John Deere 22H1025 Screw, Set, Hex Socket Head or John Deere Set Screw 22H1025

 

[beenthere]

Factory valve adjusting screws had hex(Allen) recess in each screw. Valve clearances are not easily adjusted for the inexperienced person. John Deere 22H1025 Screw, Set, Hex Socket Head or John Deere Set Screw 22H1025

This your valve?

https://partscatalog.deere.com/jdrc/sidebyside/equipment/7600/referrer/navigation/pgId/3010937

 

[nokiddin]

No. It is this one.

https://partscatalog.deere.com/jdrc/sidebyside/equipment/7601/referrer/navigation/pgId/1754930

 

[nokiddin]

I should also mention that I did take another look in better lighting, and there are Allen key holes on the set screws.

I have the adjustment protocol in my service manual, which mentions a lot of use of a dial indicator. I also saw some online people that stopped using this dial indicator method for a more simple method in some models, so I'm curious what is the best way to go about it.

 

[beenthere]

Missed what you said, due to typo ??

I also don't people online that stopped using

 

[nokiddin]

Sorry about that. I edited the above post

 

[Tx Jim]

I also saw some online people that stopped using this dial indicator method for a more simple method in some models, so I'm curious what is the best way to go about it.

I've read of using air pressure to set those valve settings on some JD scv's but I've never fully understood the adjustment process. All I know is IMHO JD engineers made those valves entirely too complicated because a simple spool type valve will control a hyd cylinder & is much less complicated.