Lowering amount of pressure required to release detent on SCV

[Tx Jim]

Is there an adjustment to make detent on scv easier to release on my M7040? I have my JD 467 rd baler attached to my Kubota tractor & the scv detent is very strong. I looked in WSM but didn't locate an answer. My M7040 pulls my 467 very well making 4X5.5 bales. Can I change detent pressure by screwing set screw out on opposite end of valve than spool?
Thanks,Jim

 

[twomany]

Take a look at this video for "ideas".
https://www.youtube.com/watch?v=eKCbIfRQAsg

Balls are common detent elements. The spring also.

One could select a softer spring, remove some of the detent balls or reprofile the spool to allow the balls to slide past more easily.

The detailed working of your valve can help make the selection. It's all under that end cap, and has NOTHING to do with fluid flow or sealing of the spool in the block.

 

[North Idaho Wolfman]

Why do you want the detent to be easier to release?
Or should I say what do you want to gain by making the detent easier?

 

[Tx Jim]

When I close tailgate on my rd baler I have to manually force scv control lever to neutral. If I don't put lever in neutral it will stay stuck forward which would heat hyd oil which is a big "no-no". Raising tailgate detent although stiff seems fine as lever will return to neutral automatically. To me detent is too strong especially compared to my JD 4255.Set screw key 180 is part I was inquiring about.
Thanks for all replies,Jim

 

[twomany]

Items labled "W" look to be the detent balls.

The collar and spring also seem to be very much like the video example.

Try removing two opposing detent balls, or try to locate a softer spring.

cutting the spring "R" shorter may work, but it is not the same as a softer spring. In fact, a shorter spring is always stiffer than the long spring it was cut from. The cut spring may have less preload however.

 

[Tx Jim]

If I disassemble to remove detent balls(key W) I'll probably remove all of them as I don't need detent unless it balls are required to hold spool in neutral. I'd still like to know what set screw is intended to do. I guess I'll have to experiment.

 

[twomany]

It looks like that screw counters parts K V and J. Do those parts have descriptive names?

If you play with the adjuster and discover something, please post your observations! ;-)

 

[D2Cat]

I think you need the detent balls left in place or it won't stay. I would go to your local hardware store and go through their "spring" collection. Find one close to same dia. and a tad weaker in compression. You can take a side cutters and modify one that is too long.

 

[twomany]

A spring can have it's spring rate reduced by grinding material off the Outer diameter.

It's not difficult to mount the spring on a close but loose fitting shaft to serve as a handle and then bring the spring up to a spinning bench grinder wheel. Just don't let the spring spin freely! They can get going mighty fast. A gloved thumb pressing on the spring is enough.
Take care not to build heat, or else spring temper will be lost. Light pressure! Cooling water and take your time.

 

[Tx Jim]

I discussed my handle stiffness caused by detent with a long time Kubota dealer & he advised me to alter the part that detent balls fit into or if I didn't desire detent just remove the detent balls.

 

[Tx Jim]

I discussed my handle stiffness caused by detent with a long time Kubota dealer & he advised me to alter the part(keys W & D) that detent balls fit into or if I didn't desire detent just remove the detent balls. He stated he thought changing where setscrew is sitting won't solve my problem.

 

[D2Cat]

The advise doesn't seem probable. How you going to alter the shaft the balls set in when in detent (D in the schematic)?

You can easily remove the balls and have no detent, that would be the only altering to "W" in the schematic. It's simple a metal ring that hold the balls in position.

I still think a weaker spring is the solution.

If you get another similar spring and install it, if you're not satisfied you can go back to the original.

 

[Tx Jim]

Update: Another Kubota dealer that's local that I had tried to contact earlier called me & advised me that I could loosen set screw in parts schematic which I did and currently detent is soft enough to suit me. I baled 65 rd bales with M7040 just fine.

 

[D2Cat]

Jim, it's just aggravating when things are so simple!

I think I'd rather have mechanical problems then bale hay in this weather!

 

[Tx Jim]

I agree the humidity in N central TX is a killer. I heard on the radio that the weather guessers are forecasting no 100° days in August for my area. Woo-Hoo

 

[russell.still.5]

I know you have gotten it to a satisfactory level now but, a friends tractor had a cable that was almost frozen up. The detent couldn't work because the cable was so stiff to move.


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