Loader on a 784 international is not getting full pressure when there is a load on the rear arms. Works fine when I place a bar on the hitch to support the arms. Also works when there is no load on the arms in the raised position. The rear weight is not attached to the top link. There is external light rams fitted with the ih connection to the release valve location. The rear linkage supports a load when the engine is stopped for a considerable time eg overnight. Any ideas
International hydraulic problem
- Thread starter murrayp39
- Start date
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J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,973
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
Hydraulics:
Type: open
Capacity: 9 gal [34.1 L]
Valves: 1 or 2
Pump flow: 13 gpm [49.2 lpm]
15.4 gpm [58.3 lpm] (optional)
The amount of the load will determine the pressure developed.
Tractor data says your 3pt capacity is about 3600 lbs.
What is full pressure?
Is there a loader on the tractor?
Do you have a hyd gage to check pressure?
Type: open
Capacity: 9 gal [34.1 L]
Valves: 1 or 2
Pump flow: 13 gpm [49.2 lpm]
15.4 gpm [58.3 lpm] (optional)
The amount of the load will determine the pressure developed.
Tractor data says your 3pt capacity is about 3600 lbs.
What is full pressure?
Is there a loader on the tractor?
Do you have a hyd gage to check pressure?
full pressure 2500 tested with a gauge, there is a silage grab on the loader with about 300kgs on the rear as a ballast weight. no prblems with the front pressure when the 3pt linkage is supported, but when the support is removed the front speed is slowed.
As stated the front loader works fine when the link arms are supported when carrying a weight, when the support is removed to allow the arms to carry the weight the front loader responds very slow and requires additional rpm but the loader is still slower. When there is no weight on the back arms and they are raised there is no problems, only when loaded. There is assistor rams on this tractor.
The High pressure carry over (HPCO) is the correct method to supply oil to a loader or other valves
mounted on the tractor!!
How many spools are fitted to tractor 1or 2 ?? Question?? If loader is supplied from the SA valve, where is the return piped to ??
However i suspect an oil leak on the draft control valve to lift cylinder mounting allowing oil loss from the hitch when the hitch is in any position but fully up!!
Under the seat is an inspection plate in the cab deck, remove this, then you will see the heads of 4 large bolts, just put a spanner on these and see if they are tight!!
mounted on the tractor!!
How many spools are fitted to tractor 1or 2 ?? Question?? If loader is supplied from the SA valve, where is the return piped to ??
However i suspect an oil leak on the draft control valve to lift cylinder mounting allowing oil loss from the hitch when the hitch is in any position but fully up!!
Under the seat is an inspection plate in the cab deck, remove this, then you will see the heads of 4 large bolts, just put a spanner on these and see if they are tight!!
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As I am not a mechanic I never thought of that problem, where do you suggest that I should connect the return too. I take that is ok to use the s/a spool valve as the feed. Would it be. Advise able to use the d/a valve as the feed and return.
J_J
Super Star Member
- Joined
- Sep 6, 2003
- Messages
- 18,973
- Location
- JACKSONVILLE, FL
- Tractor
- Power-Trac 1445, KUBOTA B-9200HST
All three of my hyd pumps return the fluid below the level of the tank.
So even if you are adding the return fluid to the filler cap, the opening of the tube should be below the level of the tank fluid. You can also make the return a dip stick level.
So even if you are adding the return fluid to the filler cap, the opening of the tube should be below the level of the tank fluid. You can also make the return a dip stick level.
"Murray"
Supplying avalve bank from another bank is not ideal also??
I will post some documents later, the correct way to supply loader from the (HPCO) high pressure carry over, which fits on the end of the valve bank, ( may be there already) and the return goes to the bottom of the transmission case, a large 1 5/16 AF plug under the r/ hand axle carrier.
This reduces noise and heating and ensures longer pump life by reducing cavitation and turbulence in the hydraulic system.
Supplying avalve bank from another bank is not ideal also??
I will post some documents later, the correct way to supply loader from the (HPCO) high pressure carry over, which fits on the end of the valve bank, ( may be there already) and the return goes to the bottom of the transmission case, a large 1 5/16 AF plug under the r/ hand axle carrier.
This reduces noise and heating and ensures longer pump life by reducing cavitation and turbulence in the hydraulic system.
Thanks a lot for your att's they have solved my problem as where to connect the flow and return, much appreciated my friend. Will have to adjust the connections asap. If only I can get the flow problem sorted now.
Thats o/k, have you checked the bolts yet ??
Do you have a service manual?? I sell PDF copies of the genuine IH manuals which i supply as a download. They can be stored and viewed on the computer and you can print off the odd page as you need it. If you needfurther info, please send me a PM with your e mail address.
Do you have a service manual?? I sell PDF copies of the genuine IH manuals which i supply as a download. They can be stored and viewed on the computer and you can print off the odd page as you need it. If you needfurther info, please send me a PM with your e mail address.
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I have not checked the bolts yet as I am attending to the sheep lambing, early mornings-late nights. No I do not have a service manual yet, send me the details please to murrayp39@yahoo.co.uk
Looked at your guides for the hose connections which I think will help me to connect the hoses the correct way.
Many thanks for your help
Looked at your guides for the hose connections which I think will help me to connect the hoses the correct way.
Many thanks for your help
Yes i understand the time of year only too well, been there, done that!!., spent my first 20 odd years on family farm in Cumbria, dairy, pigs, sheep, beef & poultry!!!
Get back to us when u can and we can progress the diagnostics till we find the cause??
Get back to us when u can and we can progress the diagnostics till we find the cause??
Tyrotownship
New member
You seem to be the guy to contact regarding HPCO and IH 784 tractors. I installed the HPCO end plate on my S/A valve and routed to an external valve. The tank line is routed to the transmission plugged as commonly suggested. Also, there's a power beyond port on this external valve which is currently dead ended. I will tie this to my loader valve (a second external valve). The purpose of the first external valve is to add a pairs of auxilliary outlets. After a test run, I have flow coming from the HPCO (after cracking a line), but no high pressure. 3 point, steering work fine. I don't quite understand the HPCO. Normally this is plugged off. So if adding a HPCO end plate is same as adding an end plate with a port, why doesn't the tractor pump dump over relief valve when the HPCO is plugged or capped off (or in configuration with original end plate with no port)?
