Need help ASAP please.

[diesel97]

Got a snowstorm coming and trying to figure out why my snowplow is acting up.I recently rigged up a jeep snow plow onto my JD 790 tied into my dump /curl circuit.Problem is now when I tilt the plow using dump line for left turn on plow its fine ...but when I use curl to tilt plow to the right I can only move my control stick a tiny bit or else it wont move the plow to the right.Now I just hooked up my forklift attachment to the tractor and when I pull the lever toward me to curl up it works fine.but when I push away from me to dump I can only move the lever a tiny bit to dump ..maybe a half inch anything farther and it starts to curl up on me when its supposed to dump.Anyone have any ideas.Thank you.

 

[RobS]

Hardly an expert but I believe plow cylinders are single action and loader cylinders are double. In other words, loader cylinders will push AND pull as they have a hydraulic connection on either side of the piston (both ends of the cylinder). Plow cylinders only push, having a hydraulic connection at one end only. There's probably a way to make it work but I can't help with that.

Good luck!

 

[glastron23]

can you send a photo of the plumbing, how did you hook the plow single acting cylinders to the bucket dump/curl circuit?? just on the way to the shop to finish hooking up and wiring the plow for the Jeep. we are getting a 1 1/2 feet to 2 feet on sunday/monday.. YESSS

 

[bandaidmd]

some more background on how you have this plumbed would help but it sounds like you possibly have quick disconnects that are not snapped all the way together.

 

[LD1]

If your tractor is similar to most newer ones, when dumping, it has re-gen. Meaning that it applies pressure to both sides of the cylinder, and naturally it dumps because the the piston has a greater surface area on that side. It is done to speed things up. BUT....if you push the lever ALL the way to the right, should be non-regen. Slower for loader work, and more power, but is what you need for being hooked to two SA cylinders. Cause in regen, you are opening the valve to allow full pressure to both cylinders.

My guess would be that one side opens a tad sooner than the other, that is why it moves if you just crack the valve open, and would also guess that there is a slight differences in geometry between the two sides of the plow, allowing equal pressure to both cylinders still angle the plow one way.

This is the best I can do without more info.

 

[diesel97]

Yes the plow cylinders are single...one hose hook up per cylinder.I basically just unplugged the 2 dump curl lines from my scv ports and ran 2 lines up from the plow into the 2 I unplugged from the scv.

 

[glastron23]

your control valve for the curl/dump is more than likely a regeneration spool or an external valve, it takes fluid from the rod side of the cylinder and moves it to the base side of the cylinder to increase speed when curling the bucket back.You can not get regen on a single acting cylinder. if you reverse the hoses on the plow it will more than likely just change the problem to the other side, if it does then you are will need to change the hydraulic circuit for this . it may be in the spool or it could be a remotely installed valve for the regeneration circuit.. Jim BOOK 2, CHAPTER 17: Regeneration circuits | Other Technologies content from Hydraulics & Pneumatics

 

[LD1]

your control valve for the curl/dump is more than likely a regeneration spool or an external valve, it takes fluid from the rod side of the cylinder and moves it to the base side of the cylinder to increase speed when curling the bucket back.You can not get regen on a single acting cylinder. if you reverse the hoses on the plow it will more than likely just change the problem to the other side, if it does then you are will need to change the hydraulic circuit for this . it may be in the spool or it could be a remotely installed valve for the regeneration circuit.. Jim BOOK 2, CHAPTER 17: Regeneration circuits | Other Technologies content from Hydraulics & Pneumatics

Shouldnt have to change anything. Just push the lever all the way and OUT of regen mode. Regen usually ISNT the only way the valve can work.

Diesel97, try what I suggested. Push the joystick all the way right. Its like the float function on the lift, the joystick has two positions when moving left. Most people are none the wiser.

 

[diesel97]

Shouldnt have to change anything. Just push the lever all the way and OUT of regen mode. Regen usually ISNT the only way the valve can work.

Diesel97, try what I suggested. Push the joystick all the way right. Its like the float function on the lift, the joystick has two positions when moving left. Most people are none the wiser.

no dice it didn't work..i have no clue.

 

[diesel97]

I got it figured out...somehow I confused the two lines reconnecting to the scv and I just swapped them and all is fine now.Thx for the replies and happy holidays.