Jay4200
Veteran Member
- Joined
- Nov 23, 2005
- Messages
- 2,053
- Location
- Hudson/Weare, NH
- Tractor
- L4200GST w/ LA680 & BX2200D w/ LA211
I've posted a bunch of times regarding my squealing valve on my snowblower rig. The 2-spool DA valve appeared to go to relief just about every time I pulled a lever, almost regardless of load. I never did find resolution - the chute controls did function, so I've just been living with the noise. Odd that the 3pt didn't trigger the relief valve - still don't understand that part.
Anyway, as I was just about finishing up using the blower Saturday, I realized that the chute controls weren't squealing. How cool - it fixed itself, I thought. Then I dropped my tractor to idle, and quickly found that my 3pt hitch wasn't working. It worked OK when I revved the tractor up though. Then I heard the hissing coming from the 'blower valve. So, it now appears that the relief valve is stuck/broken open and bypassing to tank, such that there remains insufficient pressure to operate the 3pt hitch (next function downstream) while at idle. The relief remains in bypass regardless of valve position, but (at least when I stopped working) allows enough pressure to build downstream for 3pt operation with the tractor revved up.
So, it looks now like the valve was probably defective all along - but now what to do? What do you think? Is there anything to be gained by taking the relief valve out and taking it apart? Can I get a replacement relief valve, or do I need to change out the entire valve assy.? I'm at a bit of a loss. Are the reliefs simply springed plungers, or shim-valved like motorcycle suspension?
Figures - this was my first hydraulic system project. While everything should've worked, with zero experience, as simple as the system is, there is still always that thought that I did something fundamentally wrong. Defective part - infuriating. My industry 100% tests components, billions of them per year - I just don't get defective parts.
JayC
Anyway, as I was just about finishing up using the blower Saturday, I realized that the chute controls weren't squealing. How cool - it fixed itself, I thought. Then I dropped my tractor to idle, and quickly found that my 3pt hitch wasn't working. It worked OK when I revved the tractor up though. Then I heard the hissing coming from the 'blower valve. So, it now appears that the relief valve is stuck/broken open and bypassing to tank, such that there remains insufficient pressure to operate the 3pt hitch (next function downstream) while at idle. The relief remains in bypass regardless of valve position, but (at least when I stopped working) allows enough pressure to build downstream for 3pt operation with the tractor revved up.
So, it looks now like the valve was probably defective all along - but now what to do? What do you think? Is there anything to be gained by taking the relief valve out and taking it apart? Can I get a replacement relief valve, or do I need to change out the entire valve assy.? I'm at a bit of a loss. Are the reliefs simply springed plungers, or shim-valved like motorcycle suspension?
Figures - this was my first hydraulic system project. While everything should've worked, with zero experience, as simple as the system is, there is still always that thought that I did something fundamentally wrong. Defective part - infuriating. My industry 100% tests components, billions of them per year - I just don't get defective parts.
JayC