Ford 4000 Hydraulics

Hello,

I have a 1965 ford 4000 with the gear driven pump. The lift is generally unresponsive for a few seconds and then it will go up with no problems and stays up fine while Im running it. I dont know if it stays up over night I normally put it down when Im done using it. The other day I hooked a work saver post driver to it (it has the single remote valve on it) when you turn on the hydraulics to the post driver it drops the lift to the ground and the driver doesnt work. I know its pushing fluid but Im afraid the pumps just worn out. Anyhow, before I go wild and go down the parts chasing path I wanted to see if anyone else had any ideas as to what my problem is. Any ideas would be greatly appreciated! Thanks!

[i:654c4848f0]"before I go wild and go down the
parts chasing path I wanted to see if
anyone else had any ideas as to what my
problem is."[/i:654c4848f0]

I guess I would put a gauge on it and
check pressure first.
You can buy one of these for about $20
from many places - amazon, ebay,
northern, etc.

Where would a fella hook one of those in at?

are you using an aux control valve or a remote hydraulic valve to select the driver... How does the driver return the fluid to the tractor?

The 3pt dropping means you have interrupted the flow to the 3 pt by some means. to help, we need to know the rest of the flow picture including the return to tractor.
Also if acv, what position is the draft lever in?

Hook it to the hose on the remote valve
then crack the handle open.
Don't hold it open long as you are dead
heading the pump. Just pull the handle
long enough for the guage to show the
pressure then release it.
Let us know what pressure you're
getting. A good pump should make 2000
psi or better. A new pump probably
closer to 3000 psi.

(quoted from post at 04:46:19 10/23/19) Hook it to the hose on the remote valve
then crack the handle open.
Don't hold it open long as you are dead
heading the pump. Just pull the handle
long enough for the guage to show the
pressure then release it.
Let us know what pressure you're
getting. A good pump should make 2000
psi or better. A new pump probably
closer to 3000 psi.

Click to expand...

At 1600 rpms or higher... a good pump will go up to around 2175, then pop the relief valve and then the gauge will vibrate around 1900 lbs for a 4000. 4600 would be higher, 4610 higher, again iirc.

A bad pump might go to 2175 at first when cold,, but start dropping to 1600 or even 1200 lbs after a few minutes. A really bad pump will never get close to 2175..

A glycerin filled gauge from northern tools or other places with a 1/2 iso hydraulic connector works well on tractors with quick disconnects .

https://www.ebay.com/itm/TL37-M-1-2-NPT-Thread-1-2-Ag-Hydraulic-Quick-Coupler-Poppet-Valve-Pioneer/323910004391?_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D1%26asc%3D60256%26meid%3Dd465061bf10c42f1819078dd536812d1%26pid%3D100005%26rk%3D1%26rkt%3D12%26mehot%3Dpf%26sd%3D401813989675%26itm%3D323910004391%26pmt%3D1%26noa%3D0%26pg%3D2047675&_trksid=p2047675.c100005.m1851

https://www.ebay.com/itm/2240GXB3000-Valley-Instrument-Pressure-Gauge-Glycerin-Filled-0-3000psi/193036296979?hash=item2cf1dc2313:g:KVkAAOSw0lldSzEn

and you will need a 1/4 inch to 1/2 inch reducer bushing

https://www.ebay.com/itm/1-2-1-4-Male-to-Female-Thread-Reducer-Bushing-Pipe-Fitting-Brass-Metal-NPT/183782327823?hash=item2aca47c60f&_trkparms=ispr%3D1&enc=AQAEAAADMKvsXIZtBqdkfsZsMtzFbFsbX3WcW5fmB%2Fx7ZbaZTyexL1IIkRAVlexSUhRdI5g8cPKblYDWO7I94vK0b3yPeD02DJa3cjMw8EkQVWNothXqn3U0jbIO6yiBgilTZkiqQMXbg6a3T2IxqVPz7KrGJxh%2FsemKc4oUQ1GAg%2FuZsp5%2FOQuUL4QiVAyFdlKP1fqTfpIUTcPITr6yOoUxliCn6fT5k0dfD8awYV9FAS81SPgvzx7oRg09HKbHfMJWHDBAE1KqlhxbV9OLLIcN3fwiZnGAHjMy06BXz1nfVTUvxbIzL611cqZjF0RKHgG7BJWosVh3wJr07pExHlSBEt9X855LnnKcTNpVMwQwiz8F58QaGKgZ0%2FUNuuuJUMX48zV3Pm70fGJDTfDxOG4mZQbDmX4sFNh4N3ddRASKIFOGX1SSXE4eqqWiMV0OwcR9avTwSSFx%2BA1BDhn5YXrdWPi72EoKPe%2B0WVuOhQxzJNEdLui5aW4xVyDMHnBT9fSDE9ylzTkFhZ2y2VdPo7BjP5D6a6UaJb4xN%2BoaFlpixcQ77JRerLChgbbawIiibRt1KCXFAs0sN7nJyXR0EOyLOpk63nSHB%2FlMT%2FXJ4daYGnFwM7UtJuUknw%2BfPRucmJiqlXkiE59l%2F%2FBc%2BMWtpruPK52JLI%2BxySBFgR1fMGJUxssaCTcXH6WXBoIX3RLLOCx2hqVlSVHNIndLPKOALAaYscINA3fZlahnbIae%2BwpOw0wS34q%2FxRgdkqOZGBqtidwFl3E06LNzCW9zaxcOhJfW0WrXriE0SMHbR6uZRy4UQx8X%2F0Ym%2BImdgnQRY5SY6IhZmCjcUhB6f4sd7GTeANjfRP7FxDkUVTtQ5fzPglNrL6snSO5o5D6B%2BA2FnkCAUT9iyDcm2ZlTcvN%2FQc9iHovgMEfzTyHulXtI2S3cz8XS68WtdYWrfqlkTcelhM%2B4HPPAr66ojzyLj94bIjZDrxGRXYXwzl3YJ23RoIn8iTUyqUnBO%2B3ZwbKDAJ8jx7RCRE6x7yKrDL5yIeRIXGO%2Fe34VpnCAkV1qE6vxLAuMOmO9uGNQjv%2FSllhqSa1B8kYk%2BfSIPa6bxg%3D%3D&checksum=1837823278230a7f9c60e10d423c8420f90b8ee3ca0f

good luck.

At 1600 rpms or higher... a good pump will go up to around 2175, then pop the relief valve and then the gauge will vibrate around 1900 lbs for a 4000.

Click to expand...

Is the relief valve before or after the remote valve in that circuit?

So what it is is a selector valve like this one that i have run to a quick connect on the rear end. https://www.yesterdaystractors.com/E0NND960AA_Selector-Valve_15547.htm?gclid=CjwKCAjw9L_tBRBXEiwAOWVVCTn2-ahyUncNBlPhXehwqIVSMrxD46TDOsPy7VKYCA_ypztc2q0GshoCofIQAvD_BwE
The return line on the driver is just a 1 inch hose with a pipe fitting on it that goes directly into the rear end. that way the hydraulics dont slow it down on the way down because its a gravity driver.

I didnt get a gauge, but i did take a 5 gallon bucket and i took the quick connect off and ran a funnel to the bucket and ran it for a little over a minute at different speeds and it just filled up about half the bucket. Im also quite certain that i can block the flow out the pipe with my thumb, it dont have much more pressure than a water hose.