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Discussion Starter #1
I have an issue with my 2040 John Deere’s hydraulic system. When the loader bucket reaches its limit or sometime when just working with the loader the SCV (selective control valve) kicks out. I’ve got a piece of wire holding the SCV leaver in place to keep it from kicking out. What could be causing the SCV to kick out and will keeping the SCV leaver wired in place damage the hydraulic system ?
 

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How is your loader plumbed into the hydraulics?:dunno:

It sounds like you are using one SCV and have the lever in a detent position. There is a detent that is designed to "kick out" (return to center) when the hydraulics reach full pressure (end of cylinder stroke). :good2:

I use a SCV this way for my grapple, I put it detent and as it closes, I might shifting gears, or put it in detent to open and as it opens, I can be using the "dump" of the loader to make sure it empties, or be putting the tractor in reverse, to leave the brush pile and go get the next load. :greentractorride:
 

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Sounds as if your FEL has an independent control valve powered by SCV? If so your FEL would have faster reaction time if control valve was attached directly to tractor hyd system & return oil routed to a ported hyd filter cover. See photo below for the way JD engineers thought closed-center control valve should be attached to hyd system UNLESS your 2040 is early model before serial # 266749 which would have open-center hyd's.
 

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Discussion Starter #4
Thank you (both) for your response ! I’ve attached a couple pictures of the device and lever that’s been kicking out leaving the front end loader without hydraulic power. From photographs and what I’ve been reading online I’ve assumed it’s the selective control valve (please correct me if I’m wrong). As for the hydraulic plumbing, the discharge line at the rear of the hydraulic filter (pic1) runs up to the loader control valve’s and the hydraulic line that comes out of front of the selective control valve or whatever the device is called (pic2) also go up to the loader control valve’s. Currently I use the loader with the leaver tied to a bracket with wire to keep it engaged. Will using the loader with the leaver wired open damage the system ?
 

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Serial # of your tractor isn't required after you posted photo of scv. I can determine your tractor SN is above 266749 with closed center hyd's. I've never seen a FEL control valve receive it's hyd pressure attached to scv in that manner. The way JD recommended for FEL to get pressure is removing fitting(key 4) in photo below & installing fittings(keys 13 & 21) in 2nd photo. Back when your 2040 was new I installed or supervised installing FEL on new/used JD tractors during my 21 yrs of employment at a JD dealership. If you attach hyds as I described & JD engineers recommended your scv control lever will no longer require being moved for loader to operate. Part #s for keys 13 & 21 are the following.
C19280 Adapter Fitting - ADD 15.00 USD
AW16707 Union Fitting - ADD 38.34 USD
HTH's,Jim
 

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You are half way plumbed correct. Your return is going to the ported transmission filter cover. :good2:

I agree with TxJim, you need to change the supply. You are currently supplying from your SCV, which is why you have to wire it open.

You want to connect the loader valve supply after the PCV (Pressure Control Valve) key 7, which TxJim showed you removing key 4 from AND before the SCV. It's simpler and CHEAPER to use a tee after the PCV. See drawing in post #5 for keys 3, 4, & 7

You have two options:

1) Add a JIC M/JIC F/ JIC M size 8 (1/2") swivel tee. Connect the JIC F (female swivel) to key 4 from your PCV. Then connect the line key 3 to SCV to one port of the tee and the loader valve supply hose to the other port of the tee. CHECK to see if you have room to ADD a tee to key 4! If not use option 2

2) If you do not have room for the above mentioned tee, you can REPLACE key 4 with a JIC M/ SAE M/ JIC M size 8 Run Tee. The SAE M of the tee will thread into your PCV, the SCV line key 3, and loader valve supply hose, will connect to the JIC M ports of the tee.

In the tee descriptions I am describing the horizonal tee ports left to right, then the vertical/bottom port of the tee.
JIC = JIC 37° flare. M = Male. F = Female swivel
SAE = Straight thread o ring boss
8 = size 8 which is 1/2" tube with 3/4-16 threads.

I guessing you can buy either fitting for about $5
 

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Discussion Starter #7
money pit

Thanks Gentlemen ! You’ve given me a starting place to correct the hydraulics on my 2040 (serial number 392779). I have a 40 page John Deere Shop Manual (that gives limited information) so I depend on folks like you (and what I can google on the internet) to address issues with my tractor. If you have any suggestions on manuals or web sites I’d really be appreciative !
 

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Excellent and very helpful replies were provided by both TexasJim and Zebra5. Very Well done on both counts.

I can add nothing to the discussion, other than to inquire and assume that the "Money Pit" is not a specific factory offered model, but rather the owners opinion on his tractor..:laugh:...hopefully improved with these two helpful replies.

Sounds like the helpful replies will have him solving an annoying and frustrating problem.

Well done to both TexasJim and Zebra5.....:good2:
 

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JD tech manual is night and day better. Search ebay.
 
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