I have a massey 275, however - it is an english model I guess. I usually need several manuals to work on it and several different parts books to get parts, depending what it is. Its main issue is the pto will not work correctly, no brake and poor rpm on the shaft. I split it and found the hydraulic housing, seals and drum and brake pawl all junk.Put it back together after replacement, and found I couldn't get any pressure from the auxiliary pump. Can this pump be tested? No multipower and only uses remotes with pressure off the top of the 3-point housing. How is that pump regulated. I have 0 pressure outside lh housing cover. Should I test at line to the pto housing from the pump?What should pressure b there? Thanks
Masseynut(Australia)
Member
Hello Tom,
Now there's a lot of questions posed in the one posting. First off, the system pressure is regulated around 250 to 275 PSI, depending on the tractor specs.
To cut to the chase here, the one area that is forgotten when relating to pressure problems with the low flow/pressure side of the auxillary hydraulics circuit, is the regulating valve.
With 8 or 12 speed transmission tractors, this valve is located either before the external hydraulic filter (on the upper LHS of the engine), or at the connection to the oil cooler. With Multi-power or 4wd tractors, it is located in the transmission input shaft housing, and is often over looked as a problem when diagnosing IPTO, multi-power and 4wd clutch pack hydraulic problems.
It's function is to obviously regulate the pressure within the low pressure circuit. It is NOT a relief valve, but a "shuttle" valve if you like.
The common problem with this valve is that it will often "stick" in the open position, against it's regulating spring, and in turn, dump oil flow in the circuit. This can occur from small particles of metal jamming the valve.
From what you have explained here, I'd suggest removing and cleaning this valve. Polish the spool if necessary to ascertain that the valve is free in it's bore within the valve body. I would certainly recommend buying a genuine workshop manual for the tractor, as this details the test procedure for the hydraulics circuits. This will help you understand the intricate steps needed to be taken in turn to diagnose any future hydraulics problems with either the lift or auxillary hydraulic circuits.
hope this helps,
Evan.
Now there's a lot of questions posed in the one posting. First off, the system pressure is regulated around 250 to 275 PSI, depending on the tractor specs.
To cut to the chase here, the one area that is forgotten when relating to pressure problems with the low flow/pressure side of the auxillary hydraulics circuit, is the regulating valve.
With 8 or 12 speed transmission tractors, this valve is located either before the external hydraulic filter (on the upper LHS of the engine), or at the connection to the oil cooler. With Multi-power or 4wd tractors, it is located in the transmission input shaft housing, and is often over looked as a problem when diagnosing IPTO, multi-power and 4wd clutch pack hydraulic problems.
It's function is to obviously regulate the pressure within the low pressure circuit. It is NOT a relief valve, but a "shuttle" valve if you like.
The common problem with this valve is that it will often "stick" in the open position, against it's regulating spring, and in turn, dump oil flow in the circuit. This can occur from small particles of metal jamming the valve.
From what you have explained here, I'd suggest removing and cleaning this valve. Polish the spool if necessary to ascertain that the valve is free in it's bore within the valve body. I would certainly recommend buying a genuine workshop manual for the tractor, as this details the test procedure for the hydraulics circuits. This will help you understand the intricate steps needed to be taken in turn to diagnose any future hydraulics problems with either the lift or auxillary hydraulic circuits.
hope this helps,
Evan.
Masseynut(Australia)
Member
Hello Tom,
Now there's a lot of questions posed in the one posting. First off, the system pressure is regulated around 250 to 275 PSI, depending on the tractor specs.
To cut to the chase here, the one area that is forgotten when relating to pressure problems with the low flow/pressure side of the auxillary hydraulics circuit, is the regulating valve.
With 8 or 12 speed transmission tractors, this valve is located either before the external hydraulic filter (on the upper LHS of the engine), or at the connection to the oil cooler. With Multi-power or 4wd tractors, it is located in the transmission input shaft housing, and is often over looked as a problem when diagnosing IPTO, multi-power and 4wd clutch pack hydraulic problems.
It's function is to obviously regulate the pressure within the low pressure circuit. It is NOT a relief valve, but a "shuttle" valve if you like.
The common problem with this valve is that it will often "stick" in the open position, against it's regulating spring, and in turn, dump oil flow in the circuit. This can occur from small particles of metal jamming the valve.
From what you have explained here, I'd suggest removing and cleaning this valve. Polish the spool if necessary to ascertain that the valve is free in it's bore within the valve body. I would certainly recommend buying a genuine workshop manual for the tractor, as this details the test procedure for the hydraulics circuits. This will help you understand the intricate steps needed to be taken in turn to diagnose any future hydraulics problems with either the lift or auxillary hydraulic circuits.
hope this helps,
Evan.
Now there's a lot of questions posed in the one posting. First off, the system pressure is regulated around 250 to 275 PSI, depending on the tractor specs.
To cut to the chase here, the one area that is forgotten when relating to pressure problems with the low flow/pressure side of the auxillary hydraulics circuit, is the regulating valve.
With 8 or 12 speed transmission tractors, this valve is located either before the external hydraulic filter (on the upper LHS of the engine), or at the connection to the oil cooler. With Multi-power or 4wd tractors, it is located in the transmission input shaft housing, and is often over looked as a problem when diagnosing IPTO, multi-power and 4wd clutch pack hydraulic problems.
It's function is to obviously regulate the pressure within the low pressure circuit. It is NOT a relief valve, but a "shuttle" valve if you like.
The common problem with this valve is that it will often "stick" in the open position, against it's regulating spring, and in turn, dump oil flow in the circuit. This can occur from small particles of metal jamming the valve.
From what you have explained here, I'd suggest removing and cleaning this valve. Polish the spool if necessary to ascertain that the valve is free in it's bore within the valve body. I would certainly recommend buying a genuine workshop manual for the tractor, as this details the test procedure for the hydraulics circuits. This will help you understand the intricate steps needed to be taken in turn to diagnose any future hydraulics problems with either the lift or auxillary hydraulic circuits.
hope this helps,
Evan.
Masseynut(Australia)
Member
Apologies for the double post.
thanks for the reply- sorry for the confusion-I have several IT manuals and also a factory 275 and nothing is close. That is possibly the most frustrating part! This tractor has no exterior hydraulic filter and does not have the steel framing under the seat to support the hydraulics like a normal 275.The ferguson pump runs the 3-point as well as the remotes because on top of the transfer plate there is a valve with a lever on rh by seat to choose which one you want. The auxiliary pump runs only the ipto. This tractor uses the smaller of the 2 pumps. That pump will make zero pressure and no flow.It has a staked valve in the front of it(the safety?) as well as a regulator valve on a pipe coming out of the same casting as the pressure to the pto, but dumping back into the case. I can find no pictures of this pipe and valve anywhere, but must assume that it regulates the pto pressure and is probably my problem. Your thoughts?
Masseynut(Australia)
Member
Can you give me the tractor serial number from the I.D. tag, or the country of origin maybe?
I've never seen the regulating valve mounted internally on the feed pipe to the clutch pack before?
Is there also a pipe leading up towards the front of the tractor, either travelling thru the gearbox case, or externally via a banjo fitting on the side of the centre housing(diff) case?
The only other thought I had was that if you have absolutely NO FLOW at all from the low pressure side of the Aux. pump, there is a chance that the drive coupler fitted internally in the auxillary pump, may have sheared.
This small coupler provides drive from the high flow element of the pump to the low flow section of the pump. Just a thought.
Let us know,
Evan.
I've never seen the regulating valve mounted internally on the feed pipe to the clutch pack before?
Is there also a pipe leading up towards the front of the tractor, either travelling thru the gearbox case, or externally via a banjo fitting on the side of the centre housing(diff) case?
The only other thought I had was that if you have absolutely NO FLOW at all from the low pressure side of the Aux. pump, there is a chance that the drive coupler fitted internally in the auxillary pump, may have sheared.
This small coupler provides drive from the high flow element of the pump to the low flow section of the pump. Just a thought.
Let us know,
Evan.
This tactor may possibly be an Ursus....from the writing on the position control quadrant or even a Turkish Uzel built tractor. I notice the side mounting pads on the front cradle are not drilled. These would have been drilled and tapped on a British built tractor.
I am going to ask something stupid, but did you install the idler gear on the drive to the pump? Sometimes little mistakes like this happen the best of us! Also check the splines have not sheared inside the pump drive,where they go through the gears. Check the inlet to make sure it is getting oil supply and, as Evan says, check the dump valve. I have had a few tractors that have gave me problems like you describe and it turned out to be those valves.
Sam
I am going to ask something stupid, but did you install the idler gear on the drive to the pump? Sometimes little mistakes like this happen the best of us! Also check the splines have not sheared inside the pump drive,where they go through the gears. Check the inlet to make sure it is getting oil supply and, as Evan says, check the dump valve. I have had a few tractors that have gave me problems like you describe and it turned out to be those valves.
Sam
Masseynut(Australia)
Member
Tom,
By the writing on the quadrant, I'd say you have possibly a Turkish built tractor in your workshop.
The pump looks to be a single element pump which only supplies low pressure oil for the IPTO. The one pipe with the "wrap" around it takes oil to the IPTO unit. The second pipe dumps excess oil from the pump back into the sump. This pipe looks to have a valve body of sorts fitted to it.....maybe your regulating valve. Have you had this assembly dismantled yet?
Let us know,
Evan.
By the writing on the quadrant, I'd say you have possibly a Turkish built tractor in your workshop.
The pump looks to be a single element pump which only supplies low pressure oil for the IPTO. The one pipe with the "wrap" around it takes oil to the IPTO unit. The second pipe dumps excess oil from the pump back into the sump. This pipe looks to have a valve body of sorts fitted to it.....maybe your regulating valve. Have you had this assembly dismantled yet?
Let us know,
Evan.
Thanks guys-- I did pull it apart and found the shaft to the bottom gear in the pump worn with no splines. I have located parts and am on the way to recovery. Have you heard of this Hitchings of Hereford before? And the valve on the pipe going back to case has an orifice in it and then is able to open wider.I appreciate it. Under 300# to ipto right?
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