Hydraulic Pump Destruction

[Dave_Lilly]

I have read several posts in the past about the internal hydraulic pump being destroyed on various Chinese tractors when you have a FEL with quick disconnect fittings. It seems that if either quick disconnect fitting comes loose the pump will deadhead and blow the pump because the pressure relief valve is located in the FEL control valve. This seems quite odd to me because I once owned a Ferguson TO-30 tractor that had a pressure relief valve built into the pump so there was no chance of overloading the pump. Is there some way to add a pressure relief valve close enough to the pump to avoid overloading it? I have a KAMA 354 that is used to bushhog brush and saplings on a heavily wooded acreage and with my experiences with the TO-30, the limbs, trunks and stalks always seem to get jammed into the worst possible places.

 

[RonMar]

Yes, you can add a reliefe valve on the pump outlet. I know of at least one other forum member here who has done that. I think his install is documented on John's Jinma website at the following link.

http://www.johnstractor.com/HydReliefValve.html

Short of doing that, there is a cheap trick to make the quick connects more secure. Add a large ty-wrap/zip-tie around the female connectors just behind the locking collar. This prevents the locking collar from being retracted by brush/debris or inadvertently released by someone who dosn't know better.

 

[Soundguy]

It's an all to common issue that gets a fair amount of attention here. One of the dealers has posted that he offered the extra relief kit for a added price of?? a couple hundred I think.. but said most of his customers scoff at it.

If I owned a system plumbed with QD's like that.. you can bet I'd have an integral relief.. etc.

Your to-30 pump uses the same design as my ford 2n.. etc. Good low volume low pressure long life scotch yoke pump.. they knock for 60 years and still keep on pumping...

Soundguy

I have read several posts in the past about the internal hydraulic pump being destroyed on various Chinese tractors when you have a FEL with quick disconnect fittings. It seems that if either quick disconnect fitting comes loose the pump will deadhead and blow the pump because the pressure relief valve is located in the FEL control valve. This seems quite odd to me because I once owned a Ferguson TO-30 tractor that had a pressure relief valve built into the pump so there was no chance of overloading the pump. Is there some way to add a pressure relief valve close enough to the pump to avoid overloading it? I have a KAMA 354 that is used to bushhog brush and saplings on a heavily wooded acreage and with my experiences with the TO-30, the limbs, trunks and stalks always seem to get jammed into the worst possible places.

 

[JohnS]

If you leave your fel on most of the time (like me), consider the other "low cost" fix, of removing the spring closure to the QDs. Someone posted about doing that a while ago, on a Jinma. A Kama QD should be similiar. It will make a little more of a mess when you do take the fel off. The next time I ever have to seperate mine, plan to do this. For the last X years, the wire tie solution has worked fine. I believe I changed them once because I rerouted the hoses. I did damage my pump via the QD on the initial fel install, but it took about a year before it started causing problems (sucking air).

The relief at the pump is better, and will protect against other blockages (whatever they may be?) before the first relief valve, either fel or diverter valve. The above fix will probably solve 95% of the dead heading problems.

 

[schmalts]

Its not just chinese... My brothers JD is the same. He removed his loader and didnt know enough to loop the lines and did the same thing.

 

[bones1]

Its not just chinese... My brothers JD is the same. He removed his loader and didnt know enough to loop the lines and did the same thing.

What is this loop the lines ?

 

[RonMar]

You have a line comming from the pump that mates with a QC to the loader, you have a line comming out of the loader that mates with a QC back to the rest of the tractor(3PH and resovoir). When you take the loader off, you disconnect both QC's. The two on the loader(should be a male and a female) you connect together to keep the connections clean while the loader is off. The other two on the tractor(should also be a male and a female) you connect together so the output from the pump has somewhere to go and won't deadhead and fail, and the 3PH will get fluid to still work.

As John mentioned above, the other cheap fix is to remove the check balls from all the QC's so if you forget to do this or a QC inadvertently separates, the worst that happens is that you blow fluid all over the place if you start it up with the fittings not made up. The disadvantage is that you will loose a little fluid while you are swaping the QC's around to put the loader on or off.

 

[EFC]

Soundguy, I was the one that offered it as an option but nobody took it. Doesn’t really matter though. Even with a pressure bypass if you don’t notice the problem right away the pump still goes south. For the bypass to work the pressure bypass pressure has to be exceeded by the pump........ seems easy except you don’t want the bypass kicking in every time you lift a heavy rock. So you have to set the bypass at 90+ percent of total pump pressure. Running the pump at full load will cause the pump to heat up VERY fast. It works on an old Massy because the pump is built with real steel and can handle abuse compared to a pot aluminum Chinese pump that can’t. We stopped using the Chinese disconnects after I saw the first one.

Buck

 

[3RRL]

So I don't get too confused, are you guys telling me that his tractor loader valve does not have a bypass or power beyond? If his loader valve has those, then it wouldn't matter if the QD's are not hooked together (looped)? Is that right? Or am I missing something here?

 

[Soundguy]

On the chinese pump setup.. the qd is plumbed right inline with the pump.. actually just a short piece of hose away. If the qd is not hooke dup, or mated correctly.. pretty much turning the engine over destroys some metal...

EFC: i agree The aluminum chinese pump are probably no where near as robust as good old ver engineered iron pumps like many antiques used..

Soundguy

 

[Brad_Blazer]

On my KM554 with Koyker 195, the loader valve stays on the tractor when the loader is removed. I am assuming that I am therefore protected from this problem.

I would think the engine load would be noticeable if you were running all of the fluid through a 2500 psi relief valve. That said it would be cool to have a hydraulic pressure gauge on the dash plumbed to the outlet of the pump. With a little calibration I could use the loader as a scale!.

Brad

 

[3RRL]

Brad,That's how mine is set up...like yours....that's why I asked. Your loader valve should have a power beyond and sump return on it.

 

[johnk]

I sold my Jinma 224. I didn't sell it because I didn't like it but I needed a bigger tractor. I moved a lot of gravel, dirt, augered holes with it and it performed pretty well. It had the slight problems like everyone elses but for the price it got the job done. I bought a kubota a few weeks ago and have 25 hours on it already. I bought more property so that was the reason I needed more tractor. I hjave a jinma hydraulic pump for sale on ebay that was a spare for mine. It was weeping fluid and I put a rebuild kit in it so its as good as new. If anyone cares to view it on ebay you're welcome.
eBay: Jinma 200 Series Hydraulic Pump Standard pump (item 190023314737 end time Aug-26-06 16:08:12 PDT)

You are a great bunch of guys and have great comaradirie. Yous' were a great help when I asked questions about my Jinma and the Parts suppliers were great also in the fast delievery of the goods. I look down an Orange hood now but I appreciated the Red hood and Black Koyker loader also.


Here is my website with pics of bothe tractors if anyone is interested. Take care and have a great weekend.

http://users.adelphia.net/~gizmo/

John K