MCconnell Marc 425 XL

RealMav · Jan 5, 2014

Hi ,I have a MCconnell Marc 425 XL , I think it is built by Jinma and nearly the same as Jinma 284. The tph has issues lifting when it feels like it, Also today after using fel for awhile the engine started sputtering and smoking when revved up. then all at once it blew oil out the breather on the right side of the engine. Shut it down quick. oil was over filled. Drained out more than 2 gallons filled up with 6 liters and seems fine now. Coollant level is normal , Fuel tank still full, Maybe Hydro fluid in oil, The fel and steering is slow to not working when cold. I need to get this tractor working proper.I need a new oil filter, and the filter under seat in hydro sump.Would like info and ideas on getting this tractor working.Thanks.
ps The hydro fluid looks clean, The hydro oil in the rear sump for tph looks cloudy and aerated, Are there seperate pumps and sumps for thp and fel ,steering? The only time the tph worked was when I filled it and then it bubbled out arond lift arms and plug.

quicksandfarmer · Jan 5, 2014

Sounds like a Jinma. Jinma's have a tendency to blow out the seal on the hydraulic pump, which results in hydraulic fluid entering the engine sump. Sounds like that is what happened to you. The usual cause is restriction in the hydraulic lines, there is no pressure relief and if the pressure is allowed to get too high the pump suffers.

The most common cause is the quick disconnects for the FEL coming apart.

You need to find the cause of the obstruction. Then you need to find out if your pump is blown or just the seal. Then the hydraulic fluid level. Both the steering and the FEL rely on the hydraulic pump so once you're hydraulics are working those should shape up. In cold weather the hydraulics on mine tend to be slow until the fluid warms up a little.

The balky tph lift cylinder is a common Jinma problem and probably not related to everything else, it's usually fixed with a new seal.

Diamondpilot · Jan 6, 2014

It's the same old issue. Get rid of the quick connect fittings and replace with swivels. Then fix the pump seal, change engine oil and hydraulic fluid with filters.

Chris

RealMav · Jan 8, 2014

Diamondpilot said:
It's the same old issue. Get rid of the quick connect fittings and replace with swivels. Then fix the pump seal, change engine oil and hydraulic fluid with filters.

Chris

Ok Chris , are you saying the QD 's are the restriction even if none came off or apart? thanks Ric

Diamondpilot · Jan 9, 2014

RealMav said:
Ok Chris , are you saying the QD 's are the restriction even if none came off or apart? thanks Ric

Yes, they can be restrictive internally. The Chinese QC leave a lot to be desired.

Chris

greg_g · Jan 10, 2014

The use of Teflon tape to seal hydraulic fittings is a common cause of QD blockage. Bits of it that got cut off while rethreading/tightening fittings flow in the circuit, accumulating at choke points like valves and QDs. Thread sealing compound (or liquid Teflon) is the preferred method.

//greg//

RealMav · Jan 12, 2014

Hi all, did a bad thing, trouble shooting the tph I took a plug out of the lift lever control ,not knowing what was under it out popped a spring and maybe more small parts,I have been unable to find them if they came out in the snow. They would be a ball 5v part number gb/t308-89-5v and a spring seat part number 14fp.57.118. from my book on this tractor. Can I order just these parts or do I need the whole control? I auctually did this before the overfilled engine oil issue. could they be related? Still need to remove pump and replace front seal. And figure a cure for relief valve.It was warmer out today so I cleaned out a spot under cover for the tractor and moved it . the loader and tph worked and now its under where I can work on it. Just where to start? Thanks for all help and tips. Ric

RealMav · Jan 12, 2014

I traced out all of the hydr lines and find a line coming out of the spool thru byd port and one out the output port . the one from out goes to a tee. the tee connects to two hoses .one goes to back of tractor to a qc that is connected to the hose back to byd. the other side of this tee goes to the divider valve,then out of divider one goes to steering and one goes to ift control, and a 4th goes to return to tank which is teed into return from steering. there is a relief valve in the spool but do no under stand where relieved pressure would go? the spool is feed directly from pump. thanks Ric
http://www.generalimp.com/sites/default/files/product-pdf/kelley_loaders_dl1000.pdf this is the loader I have.

erj · Jan 13, 2014

Ric, let's see if this helps any. Here are pictures showing the hydraulic flows on my Jinma.
1. I don't understand why you have a hose coming out of the Power Beyond port unless it was to mount a piece of equipment that is no longer attached.
2. When you say 'spool' are you meaning the FEL control valve?
3. Please clarify "one goes to ift control".
4. The FEL control valve contains spools that drive the cylinders to raise/lower/tilt the bucket.
5. On my control valve, when the relief valve is engaged the fluid escapes through the outlet port.

RealMav · Jan 13, 2014

I traced out all of the hydr lines and find a line coming out of the fel control valve thru byd port and one out the output port . the one from out goes to a tee. the tee connects to two hoses .one goes to back of tractor to a qc that is connected to the hose back to byd port. the other side of this tee goes to the diverter valve,then out of diverter one goes to steering and one goes to tph lift control, and a 3rd goes to return to tank which is teed into return from steering. there is a relief valve in the fel control valvel but do no under stand where relieved pressure would go? the fel control valve is feed directly from pump. thanks Ric
http://www.generalimp.com/sites/defa...ers_dl1000.pdf this is the loader I have.
erj ,mine is like yours except the byd port being connected back to the out port, I think there by disableing the relief valve in the fel control valve. I think it had a back hoe at one time. Today I un coupled the two lines and then it will not lift fel at all. New pump is on the way.With those quick disconnects undone do you think the pressure relief valve in the fel control valve will protect the pump.?
Take a close took at the photo in my first post and you can see the line out of byd port, then look by the back light a you can see the quick connects together. I have unconnected those two lines . It does not seem like they should be connected, Thanks Ric

erj · Jan 13, 2014

Ric, I would:
1. Remove the hose that goes between the Power Beyond and that tee. Plug the PB Control Valve outlet and also that now open tee outlet. I don’t think that it is a good idea to ever leave QDs disconnected.
2. Get a pressure gauge to hook up between the pump and the inlet for the FEL control valve to see what pressure is being generated. I would do this before I installed a new pump.

RealMav · Jan 13, 2014

Will do and thanks for all help, Ric

erj · Jan 14, 2014

Ric,
Don't know your knowledge about hydraulics - so in case you don't know.
Use hardware that is made for the High psi of hydraulics - don't just grab anything from a hardware store.

RealMav · Jan 14, 2014

thanks erj, I have very limited hydraulic knowledge and believe that the only dumb question is the one not asked, That said on my kelley dl 1000 fel and controls, should I be suspecting the four QC on the loader control valve as a possible obstuction and cause for deadhead of system?

erj · Jan 15, 2014

The 4 QCs could possibly be a problem. First let's get done the 2 items I previously mentioned. Once a pressure gauge is on there, we can look further.

RealMav · Jan 17, 2014

Ok I have another question. first off I am woking on taking the power behond off I had to order a plug to go where the power behond conversion plug is . Is it possible that uncoupling the quick connect with engine running that was at the back of the tractor caused the dead head? This would stop flow thru the power behond

Affordable · Jan 17, 2014

There's not a doubt that caused a dead head !!!

Tommy
Affordable Tractor Sales
"Your Jinma Parts Superstore"
Home of compact Jinma, Foton, and Koyker Tractors and Parts, Wood Chippers, Backhoes - Affordable Tractor Sales Company

RealMav · Jan 19, 2014

I just removed the pump and pushed the seal back in position and put the pump back on.. First time running with new pressure gauge.The engine was overfull and the hydro was way low. I then took a video of operation of fel with gauge . What should the pressure be running at? I have a new pump but will wait to put system pressue relief check valve on before installing new pump hydraulic gage 004 - YouTube

Diamondpilot · Jan 19, 2014

RealMav said:
I just removed the pump and pushed the seal back in position and put the pump back on.. First time running with new pressure gauge.The engine was overfull and the hydro was way low. I then took a video of operation of fel with gauge . What should the pressure be running at? I have a new pump but will wait to put system pressue relief check valve on before installing new pump hydraulic gage 004 - YouTube

At the end of the stroke it should have reached 2000 psi minimum. You have a damaged pump.

Replace it.

Chris

erj · Jan 20, 2014

Ric,
As Chris mentioned, you should have at least 2000psi when controls for FEL go into 'relief' mode.
I suggest:
1. Get that plug installed for the Power Beyond.
2. Get that Power Beyond hose removed.
3. Plug that Tee at the other end of the PB hose.
4. Repeat what you did in the video and see if there is any change in pressure.

You now have 2 outlets on the FEL control valve that are feeding fluid into a tee fitting that has only one outlet for going to drain. I don't know for sure, but I suspect that can affect the reading that you saw today on the pressure gauge.

Personally, I would not install the new pump until these things have been done.