My Henan Qianli 304 Tractor

[Bradtot]

Hello Below is My tractor I imported direct from China into australia.
Someone said about Rules and pics so here they are.
I dont know of anyone else with this brand, but it looks similar to a Foton/Nortrac/Jinma etc etc.
I orderd it with a bucket and backhoe(not in the picture) and a large slasher.
It is a 3cyl diesel, Laidong is the brand of engine.
I optioned it up with the backhoe, FEL, multiway valve, Canopy, ROP's,Hydrolic steering, airpump,double stage clutch, 2 speed PTO and hydrolic booster pump.
all up inc gst and delivery 13.5k.
Problems I had
1 no water in radiator and no warning of such, so I did not know when tring to drive it out of the container, lucky I was not running it for very long.
2 alternator wire rubbing on fanbelt
3 flat front tyre
4 hand throttle cable rubbing on rear wheel
5 fuel gauge did not work
6 all bolts to wheels and swivel pins all very loose
7 air tank weld had hole in it so it was leaking.
8 multiway valve leaking
9 hydrolic pump connections leaking/loose
10 FEL controls leaking/loose
11 Canopy damaged scratched
12 hood/ bonet catch would not release

All of the above I could fix.
I am still left with one problem and that is the 3 point linkage I cant get to go up unless I have the valve under the seat tightened and the diverter lever in the up position and then I have to use one of the multiway valves(the ones with the red caps on the rear) It doesnt matter wich lever of the valves I push as long as one is pushed , then the 3 point linkage will go up. Note however I dont have to have anything connected to the connectors for this to work.
If I have the diverter lever in the down, or forwat position , the 3 point linkage will not move it just stays in te up position.
The only way i can get the 3 point linkage to go down is to undo the valve under the seat.
However if what I am lifting is very heavy, say the slasher then I cant undo the valve under the seat as there is too much pressure on it. If I use a big spanner then it will move but is very tight. If I have nothing on the 3 point linkage to lift then the valve I can turn by hand.
I have been trying to get the manufacturer to understand my problem via Skype but it is very hard to make them understand my problem I have even sent them a video, but they are saying a have a "partial seperated lifter" Can anybody tell me what this is?
All I want to be able to do is use the diverter lever to lift up my slasher or whatever I have and then to lower it to the height I want push the diverter lever forward, but this does not happen for me.
Can anyone give me some guidence as to where to look?
I believe that because I have added the multiway valves which appear to be in series with the hydrolic line back into the side of the reservoir tank, that when I move one of the levers that I am blocking that flow therefore causing pressure and then thats what makes the piston of the 3 point linkage move.
Its all new to me and I am trying to understand how it all works.
Brad

 

[greg_g]

The knob under the seat is what regulates the rear lift rate-of-fall. It basically controls how fast the hydraulic fluid returns to the sump. No-load or light load, you want a fast flow. So that heavy loads do not drop too quickly, you want a slow flow. So you adjust the rate of fall based upon what - if anything - is attached to the rear lift. But in the closed position, there's no return at all. Hence the lift arms refusing to drop.

I'm not familiar with your specific configuration, but some flow control valves also act as diverters. To achieve that, the valve must be completely in the opposite direction of closed. If that doesn't apply to yours, other configurations have what appears to be an otherwise unexplained hex head bolt coming out of the left side of the hydraulic sump. Innocuous as it looks, this is another variation on the diverter valve.

If neither of those observations prove applicable, it may indeed be the way the post-purchase hydraulics are plumbed in.

//greg//

 

[Bradtot]

The knob under the seat is what regulates the rear lift rate-of-fall. It basically controls how fast the hydraulic fluid returns to the sump. No-load or light load, you want a fast flow. So that heavy loads do not drop too quickly, you want a slow flow. So you adjust the rate of fall based upon what - if anything - is attached to the rear lift. But in the closed position, there's no return at all. Hence the lift arms refusing to drop.

I'm not familiar with your specific configuration, but some flow control valves also act as diverters. To achieve that, the valve must be completely in the opposite direction of closed. If that doesn't apply to yours, other configurations have what appears to be an otherwise unexplained hex head bolt coming out of the left side of the hydraulic sump. Innocuous as it looks, this is another variation on the diverter valve.

If neither of those observations prove applicable, it may indeed be the way the post-purchase hydraulics are plumbed in.

//greg//

Hi Greg thanks for the posting.
I understand and agree with what you have said.The tractor is basically working with the valve under the seat the way you say.
Regarding the speed of dropping and when the knob is turned it locks the height, all this is working as it should except that to raise the 3 point linkage i have to have the diverter lever pushed to the rear and then also move any one of the aux valves to the open position.
I played around again last nite and actually got the diverter lever when in the position to lower the equipment to actually do that, To accomplish this I had to hold the aux valve lever in the open position, its seemed to me that the valve under the seat may not be moving correctly as one minute it would work ok up and down and then it was either too loose or too tight as it would either drop in a hurry or not drop at all.
I will have a look at this valve under the seat next weekend and see if anything may be sticking/ jammimg.
I still dont know why I have to have one of the aux valves open, this has me stumped.The way I got it to work was to jam something in the lever so it was open and then play with the valve under the seat until when I used the main diverting lever it would go up and down as I believe it should work.
I will take a picture of the pipe layout and aux valve levers plumbing and from that you may see something that I dont?

Ta
Brad

 

[greg_g]

Again, I've no hydraulics qualifications other than those obtained from years of tractor ownership. But what you describe suggests a return flow problem. With both levers in that control box in the center position, fluid should be flowing straight through the box and back to the sump. Using a lever re-routes the fluid around whatever may be restricting flow through the open center. What does the Allen-style protrusion (the six sided rusty one) do? Looks like it could be unlocked at the black hex, then turned with a socket wrench (12mm?). Might that have something to do with regulating flow through the open center?

//greg//