I'm trying to flow test a 2950. I have my inlet plugged into the pressure line off the pump before the pressure control valve. My outlet is plugged into the right scv, right port with the scv lever tied back. I'm only getting about 5 gpm and not steady. That cant be right can it? I had 2200 psi at the scv with my gage plugged into it. Reason for flow testing- draft goes up slowly, pump is a little noisy, and the loader will raise slowly and hop. I installed a new filter, and cleaned the pump screen. I checked stroke control valve and the seat is a little worn but not to bad. What am I missing?
- Thread starter fordfx413
- Start date
What pressure is your flow rater working at?. Without going to a book I believe your method is ok, I would send my return oil into a ported filter cover if there was one available.
Any chance you could tell us what the lube pressure is with the main pump in and out of stroke?
Any chance you could tell us what the lube pressure is with the main pump in and out of stroke?
I measure lube pressure at the resevoir above the main pump. Once you have a fitting to work there it is an easy spot.
This does not tell what the transmission pump is doing, it tells if your main pump is feeding a high pressure leak....rereading what you have posted would say this is not the case. The values you are seeing would show with little power steering.
This does not tell what the transmission pump is doing, it tells if your main pump is feeding a high pressure leak....rereading what you have posted would say this is not the case. The values you are seeing would show with little power steering.
Ok. I don't feel anything getting warm and squealing... The front pump doesn't chatter like its starving for oil. Power steering works as it should but the is a little drag. When the wheels are cranked all the way the steering wheel does shake though. Do I need to check lube pressure like you stated? Just use a fitting, hose and a gage? What can I expect for pressure? Which hose is the best to use for this test?
Lube will be anywhere from 5psi to 25 depending on oil temp etc. The figure to watch is the DIFFERENCE in pressure when the main pump is in stroke/out of stroke. There may be a manual destroking valve already on the pump on the top side, it may be a 7/16 head screw or a T handle made from a small roll pin. Turning the screw in takes the pump out of stroke, turning it back out puts the pump back in stroke. Lube pressure may change between the two settings. 3-5psi difference is ok, more than that indicates a leak on the high pressure side, possibly in the rockshaft valve or SCVs
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
What type valve controls loader?(scv or ind spool)? What type diagnostics have been performed? Do hyd's operate the same with pto both on & off? With 3pt raised,engine running look in hyd filler hole behind seat for moving oil? Have you ever tested hyd pressure with power steering supply line capped?
ind spool valve. 1 hose from pressure control valve, other hose to filter base. yes they operate the same with pto on and off. I looked in the hyd fill hole and no oil spraying or anything. There is some moving oil down below the differential. I had not tested with PS supply capped. I put a gage in the scv and am getting 2200 psi. Hooked up my flow rater- inlet before the pressure control valve and oulet in scv. At high idle I had 6 gpm at 400 psi. Needle valve open all the way.
buickanddeere
Well-known Member
2950 was built with the 40cm3 , 2000 series pump which was optimistically rated at 23 USgpm at redline.
Front pump can move more oil than what is supplied to the front pump through the line from the transmission pump. Unless a ported filter is used . iirc transmission pump capacity is around 7gpm or so.
5gpm is about all the front pump can do until the oil flow supplied to it is increased.
Do you think if have a transmission pump issue? My reservoir above the pump is full and the pump doesn't sound like it starving for oil. I would think since the reservoir is full, its getting plenty of oil to the front pump. But maybe I'm wrong. Is there a quick trans pump flow test I can do? I need to split this tractor for a clutch but I don't want to split until I get this hydraulic problem figured out.
Tx Jim
Well-known Member
- Location
- Coyote Flats, Texas
Why did you attach flow meter out hose to scv? For brief GPM test with flow meter I'd put out hose in hyd filler hole opening or better yet attach to ported filter cover. Is frt end loader valve the convertible type that can be changed from open to closed center?
buickanddeere
Well-known Member
Vast improvement over the scrawny pump used in the four cylinder 40 series Utility tractors.
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