Jinma / JW03 Backhoe Hydraulic pressure release valve

[Jimbr549]

With a screwdriver, remove the adjusting screw being careful to count the number of turns (write it down).

Ooops. I guess I'll be getting a pressure gauge, and installing a port for it.

 

[Bob Rooks]

Ooops. I guess I'll be getting a pressure gauge, and installing a port for it.

Good call. And be sure to use schedule 80 pipe or hydraulic fittings.

 

[IBPALLETS]

Thanks Bob

Anybody used this one ?- is 11 GPH ok for this application. Do you need to replace hose for this application ?

 

[Bob Rooks]

Thanks Bob

Anybody used this one ?- is 11 GPH ok for this application. Do you need to replace hose for this application ?

Eleven gallons per minute is fine for this application (I believe your tractor system is 7 gpm).
Yes, you will have to replace hose assemblies or hose end fittings with reusable fittings (this is what I had to do), or take to a hydraulic shop. One end of the hose has the metric ORFS fitting, the other end of the hoses for the new valve need to be:

• A & B Work Ports: #8 SAE O-Ring (3/4”-16) Thread
• Inlet Port: #10 SAE O-Ring (7/8”-14) Thread
• Outlet Port: #10 SAE O-Ring (7/8”-14) Thread

 

[IBPALLETS]

Eleven gallons per minute is fine for this application (I believe your tractor system is 7 gpm).
Yes, you will have to replace hose assemblies or hose end fittings with reusable fittings (this is what I had to do), or take to a hydraulic shop. One end of the hose has the metric ORFS fitting, the other end of the hoses for the new valve need to be:

• A & B Work Ports: #8 SAE O-Ring (3/4”-16) Thread
• Inlet Port: #10 SAE O-Ring (7/8”-14) Thread
• Outlet Port: #10 SAE O-Ring (7/8”-14) Thread

OK Bob great info thanks so much- one more thing - Do you know what size the ORFS fittings are on the current hose at valve stack now. [ I presume both ends are the same ] I will see if someone makes a adapter from that to the 8 and 10 SAE ports.?

 

[Bob Rooks]

OK Bob great info thanks so much- one more thing - Do you know what size the ORFS fittings are on the current hose at valve stack now. [ I presume both ends are the same ] I will see if someone makes a adapter from that to the 8 and 10 SAE ports.?

IIRC, the working hoses are 14mm (~1/2"), and the inlet/outlet hoses are 18mm (~3/4").
Tommy at Affordable Tractor used to sell adapters.

Affordable Tractor Sales Co

www.affordabletractorsalesco.com

 

[IBPALLETS]

Ok thanks - I already sent Tommy a email about possibility of scrap china stack for the part. will see if he has converter adapters - he is out of those actual parts.

 

[Bob Rooks]

Ok thanks - I already sent Tommy a email about possibility of scrap china stack for the part. will see if he has converter adapters - he is out of those actual parts.

I have done business with these folks before, they may have what you need. I might add that they can also make hoses for you.

Metric Fittings: DiscountHydraulicHose.com

Metric fittings can be tricky, but they don't have to be with Discount Hydraulic Hose. Our wide selection of Metric adapters will connect your imported equipment for less money and hassle.

www.discounthydraulichose.com

 

[PAULWILKIE]

Well we got it apart with tractor mech help - now we have another problem one part fell into the hole from hell where ever that is . looked three days and cant find - anybody have a junked control box they want to parts out - And BTW there was chewed up O ring which has been my problem before . now I have a new one.
ANY BODY WITH A SCRAPED CONTROL BOX THEY WANT TO MOVE I DOUBT THATS A ORDER PART ???

Be careful there is O rings that are rated for hot fluids. I kept using a normal one and it keep going through the system when it got hot. Once I found out there is different o rings I was good. I changed my control valves over. What a mess the original fittings are a special metric type . I ended up buying fittings and had them welded onto the original fittings. I would take your hoses off and turn your valve upside down to get what ever fell in there