Flatrockcorner
New member
- Joined
- Sep 17, 2019
- Messages
- 12
- Tractor
- Massey Ferguson GC1725M
Just curious how you guys tied up or stowaway the hydraulic lines when you don't have the backhoe on the tractor?
Speaking of backhoe lines anybody have any good information on how they connect to FEL "BP" port and "P" port of 3PH control... Think I am getting handle on how to do power beyond with same lines as BH but have a idea that the diagram in shop manual has some errors...
Dale
Here is the information I think you are looking for in the thread of the link listed below, Post #9, #12, & #14 especially.
https://www.tractorbynet.com/forums...89305-can-hydraulics-backhoe-used-adding.html
This is the way I understand the flow of hydraulics from the FEL to the BH to the 3 point hitch:
The hydraulic supply line from the FEL Power Beyond (PB) port has a male coupler end located at the rear of the tractor, and is called "the Pressure Hose (1)" in the MF Backhoe Manual, which connects to the female coupler end coming from the backhoe's Pressure Port (P) valve assembly.
The male coupler end of the hose coming from the backhoe's Power Beyond (PB) port valve assembly connects to the female coupler end of the hose called "the Return Line (2)" in the MF Backhoe Manual, and is located at the back of the tractor and then goes to the Pressure Port (P) of the tractor's "3 point hitch" valve assembly.
The couplers in red above connect together when the Backhoe is removed.
The male coupler end of the hose coming from the backhoe's Return (T) Port valve assembly connects to the female coupler end (this hose coupler end remains loose when the backhoe is removed) of the hose called "direct return to the transmission sump (3)" in the MF Backhoe Manual, and goes to the "transmission sump tank".
I have been thinking about these hydraulic flows/connections for about 11 years now and I still do not have a real good grasp of it.
I hope this helps you with our tractors hydraulics flow...
KC
I am pretty much in agreement with your description, but the two things the elude me is what connection is used on control valve body of 3PH as the "P" (from BP of BH) port for 3PH..
Graphic provided is what I believe to be a "correct" copy of partial hydraulic system as I believe the one in shop manual has at least 3 errors in way its drawn...
View attachment 644707
Dale
All I know is what I have learned over the years and am still learning about tractor hydraulics.
The main flow of these valve assemblies is:
Hydraulic flow into the valve connects to the "P" port,
and hydraulic flow out of the valve connects to the "PB" port,
and the hydraulic so called over pressure flow back to the tank from the "T" port of the valve.
Our tractor valves appear to be an "Open Center" valve and each valve has a power beyond port to flow to the next valve.
This is why it's a must to connect the 2 hoses from the backhoe when it's removed, to complete the flow of hydraulic fluid to the 3 point hitch.
I'm not sure if I answered your post above, but I'm sure if I was to read my post above 10 years ago it would of been way over my knowledge back then about hydraulics.
Back then it was more important and hard enough to figure out all of the tractor levers.
KC
View attachment 644732