Jay4200
Veteran Member
- Joined
- Nov 23, 2005
- Messages
- 2,053
- Location
- Hudson/Weare, NH
- Tractor
- L4200GST w/ LA680 & BX2200D w/ LA211
I would say that the chute is binding, causing undue force on the cylinder, and causing the valve to go into relief. However, it should go into relief at the stops as has been mentioned. Undo the cables and try to rotate the chute. If you can not, spray it down with penetrating oil, then lube it good. You should be able to rotate the tube by hand.
I can rotate the chute manually, but the mounting system is far from desirable. The chute itself is mounted on 4 pieces of slotted nylon - when everything is centered, it slides easily, but there is side-to side play, and it tends to hang up. I cleaned and greased all of the bearing surfaces, so it's as good as it is ever going to be. When the cable actuates the chute, the chute is pulled against the hoop-side guides, so I could guess that a lot of friction is created in the slotted guides on that side. The chute hoop does turn easily through the middle of travel, but seems to hang up right at the ends a little bit, although that area might already be outside the normal travel range. I have also removed cleaned and lubed the piston pivots, but have not disassembled the hoop pivot - it does have a grease fitting and I lubed it - I will take it apart and clean and lube it eventually. I agree, it is a weird setup - not only does it use excessive mechanical disadvantage, but it also creates a large moving object with sharp edges that is right in the middle of all of the hydraulics. Oh well, I'd expect no less from a French Canadian company
I've been thinking of various ways to re-engineer the chute mounts - getting the chute riding on bearings would be infinitely better and would likely reduce the operating force by an order of magnitude.
That being said, lets assume for now that there is NOT undue mechanical force required to turn the chute, and it is moving as designed. There will still be a fair amount of pressure required due to the mechanical disadvantage designed into the system. Since the chute is moving at a reasonable clip while the valve is squealing, I'd have to assume that the relief blow-off is premature. Given all of that, what could cause a premature blow-off of the relief, and even more importantly, why would it squeal AND how can I make it stop squealing?
It is also possible that there is something either wrong with my valve, or the valve could be put together with incorrect spools maybe - don't know, although all of the functions seem correct. My downstream 3pt works, so the valve is OC and the PB works, and the work ports appear to be functioning as expected (except for the squealing).
JayC