New loader valve not working properly

[jd4310man]

Just got done with a new valve installation on my loader. Im using the 10 gpm Brand LV series loader valve that uses one control stick to operate two spools. it has float position and regen mode. I installed a power beyond plug to feed an auxiliary valve down stream. All lines to loader are correctly connected, flow from pump comes in to the new valve and exits out threw the power beyond. It then feeds the aux valve downstream. I also installed a bypass hose to the return line as per instructions. My problem is the loader will raise normal but lowering it puts a load on the engine. The bucket also will put a load when moving in either direction. There is no load on loader to cause a strain to the engine, but from just moving it back and forth, it is causing a buildup of pressure when there is no load on hydraulics. The speed is not very fast so I don't think its because of too much flow, although im not exactly sure as im using a flow divider that is preset from factory. Any ideas what would cause this strain on the system with no load on system?

 

[Harry in Ky]

Better check your bypass/return hose. This needs a free return to sump. Sounds like you don't have that.

 

[J_J]

Re-set any QD's in the loader circuit.

Install a hyd gage so you monitor and trouble shoot the hyd system.

Check and see if any of your fittings are restrictors.

Is your 3pt lever in neutral?

 

[Fedup]

If the return hose from the new valve is correct, why would the three point lever have any effect on loader operation? Seems like pressure is stacking up because return oil flow has nowhere to go. Return oil goes to tank, not through power beyond to three point.

 

[J_J]

If the return hose from the new valve is correct, why would the three point lever have any effect on loader operation? Seems like pressure is stacking up because return oil flow has nowhere to go. Return oil goes to tank, not through power beyond to three point.

What would you think would happen if the 3pt was in the up position. If the lever is friction controlled, then the arms would be up and the valve relieving, and providing back pressure back up through all the valves. It will cause problems.

The 3pt when not is use, should be in neutral, so all pass through fluid will go directly to tank.

 

[jd4310man]

I was messing around with it today and I think the problem is with the fittings im using on the out ports to the loader cylinders. They seem to be causing a restriction of flow. I turned down the flow divider and it didnt stall the engine but the speed was too slow. I think im going to change to a larger size fitting at the loader valve and see what that does.

 

[J_J]

Some people make a mistake of buying restrictor fittings which will restrict flow.

Remove any fitting you suspect might be a restrictor fitting.

Similar to this.

http://agandfarmsupply.com/shop/art...ITTING.html?shop_param=cid=161&aid=1404R-8-8&

https://www.google.com/search?q=hyd...tricted-orifice-my-hydraulic-4.html;1200;1187

 

[Fedup]

Three point is downstream from loader valve isn't it? Loader valve is first in line for oil flow, so anything past the valve won't affect it's operation. The problem has to in the loader circuits or the return. Position of three point lever makes no difference.

 

[J_J]

Sure it will, just block the flow downstream for the PB and the return .

If the 3pt lever is up, you are already providing back pressure.

Stop the return flow, and the cyl will stop.

Install a gage in the IN port of the FEL valve and tell me what you see when the 3pt lever is full up.

Now, try working the FEL levers and tell me what you see.

 

[oldnslo]

3PH position,
A lot of what JJ is saying depends on the type of control on the 3PH. On my Kubota BX it operated like a directional valve where the lever was supposed to spring center allowing the flow to return to tank under no load. On my Branson 2400H it has position control so moving the 3PH lever moves the arms to a given position and then holds them close to this position. There is linkage on the lift arms that provides feed back to the directional valve that centers the spool and allows the oil to return to tank under no load. If the directional valve for the 3PH sticks or is held in the raise position it will create back pressure on your system.

Fedup is also correct that if the "Tank" line on the loader directional valve is connected properly, the position of the 3PH valve would have no bearing on how the loader valve operates since the return flow from the loader cylinders should be going directly to tank and NOT to the 3PH valve.