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Ford 8n slow loader

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brownell3387
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PostPosted: Sun Feb 21, 2021 9:44 am    Post subject: Ford 8n slow loader Reply to specific post Reply with quote

Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.
 
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Jim.ME
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PostPosted: Sun Feb 21, 2021 9:59 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 13:44:55 02/21/21) Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.


First, check the drive between the engine and pump. Those have been known to wear out. You changed to oil, does it have a suction filter or screen? If so did you changed or clean that? If the problem is just in the lift, not the bucket functions, you could have bad packings in one or both cylinders. If the problem is both, the lift and bucket, the pump could be worn out or a relief valve stuck open/broken.
 
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brownell3387
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PostPosted: Sun Feb 21, 2021 10:04 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

The drive from the engine to pump seems to be spinning fine.and I didnt see a screen or filter for the fluid. And its both bucket and lift they are super slow. I took the pump apart to inspect and everything looked good not worn out or anything
 
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SkipperII
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PostPosted: Sun Feb 21, 2021 10:07 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

I would look at the pressure relief valve first. It is possible that it isn't seating, due to crap in the system, or a rusty seat. Tee a
pressure gauge into the pressure line from the pump, bottom a cylinder out, and see what kind of pressure you are getting. I'm not sure what
your system is capable of, you might need to research it. If the relief valve looks good, try increasing tension on the spring and see if
the pressure increases, if it doesn't it may be the pump.
 
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brownell3387
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PostPosted: Sun Feb 21, 2021 10:27 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

Where on the system would the pressure relief valve be?
 
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8NChris
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PostPosted: Sun Feb 21, 2021 11:34 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 11:27:48 02/21/21) Where on the system would the pressure relief valve be?
The screen will be inside the reserve tank where the larger low pressure line feeds the pump.
 
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TheOldHokie
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PostPosted: Sun Feb 21, 2021 1:06 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 13:44:55 02/21/21) Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.


Take the hose from the pump loose at the valve inlet and stick it in the filler on the reservoir. Make sure its not going to fall out by tying it to the reservoir. Now start the tractor and set RPM to mid throttle. Observe the flow coming from the pump. If its flowing like a garden hose the pump is moving oil. If its just a trickle the pump is either shot. not spinning, or starved of oil on the supply side. Once you do that report the result and we can move to step 2.

TOH
 
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brownell3387
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PostPosted: Sun Feb 21, 2021 2:38 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote


Its flowing like a garden hose seems to
Have good pressure coming from pump
 
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brownell3387
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PostPosted: Sun Feb 21, 2021 3:52 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

TheOldHokie wrote:
(quoted from post at 14:06:56 02/21/21)
brownell3387 wrote:
(quoted from post at 13:44:55 02/21/21) Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.


Take the hose from the pump loose at the valve inlet and stick it in the filler on the reservoir. Make sure its not going to fall out by tying it to the reservoir. Now start the tractor and set RPM to mid throttle. Observe the flow coming from the pump. If its flowing like a garden hose the pump is moving oil. If its just a trickle the pump is either shot. not spinning, or starved of oil on the supply side. Once you do that report the result and we can move to step 2.

TOH


Flowing like a garden hose seems to have good pressure from the pump
 
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TheOldHokie
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PostPosted: Sun Feb 21, 2021 3:57 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 19:52:37 02/21/21)
TheOldHokie wrote:
(quoted from post at 14:06:56 02/21/21)
brownell3387 wrote:
(quoted from post at 13:44:55 02/21/21) Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.


Take the hose from the pump loose at the valve inlet and stick it in the filler on the reservoir. Make sure its not going to fall out by tying it to the reservoir. Now start the tractor and set RPM to mid throttle. Observe the flow coming from the pump. If its flowing like a garden hose the pump is moving oil. If its just a trickle the pump is either shot. not spinning, or starved of oil on the supply side. Once you do that report the result and we can move to step 2.

TOH


Flowing like a garden hose seems to have good pressure from the pump


OK that's encouraging. Next is a pressure test. Do you have a hydraulic pressure gauge good for 3000 PSI?

TOH.
 
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brownell3387
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PostPosted: Sun Feb 21, 2021 6:31 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

TheOldHokie wrote:
(quoted from post at 16:57:51 02/21/21)
brownell3387 wrote:
(quoted from post at 19:52:37 02/21/21)
TheOldHokie wrote:
(quoted from post at 14:06:56 02/21/21)
brownell3387 wrote:
(quoted from post at 13:44:55 02/21/21) Hello I have a ford 8n with a loader on it auxiliary hydraulic pump on the front loader body is the reservoir has hydraulic bucket also. I replaced all the lines and fluid because when I got it the fluid was contaminated with water and lines leaking bad loader wouldnt move at all so new hoses new fluid now loader will only go up with throttle all the way up and even then it goes super slow and can not lift any extra weight looking for ideas on what issue could be. I do not no how it ran before I replaced everything because the tractor didnt run when I got it.


Take the hose from the pump loose at the valve inlet and stick it in the filler on the reservoir. Make sure its not going to fall out by tying it to the reservoir. Now start the tractor and set RPM to mid throttle. Observe the flow coming from the pump. If its flowing like a garden hose the pump is moving oil. If its just a trickle the pump is either shot. not spinning, or starved of oil on the supply side. Once you do that report the result and we can move to step 2.

TOH


Flowing like a garden hose seems to have good pressure from the pump


OK that's encouraging. Next is a pressure test. Do you have a hydraulic pressure gauge good for 3000 PSI?

TOH.

I do not have one Ill see if I can get one
 
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TheOldHokie
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PostPosted: Mon Feb 22, 2021 4:50 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 22:31:29 02/21/21)

I do not have one Ill see if I can get one


You will need a gauge with a short hose and adapters for connecting to various test points in your hydraulic system. Don't spend a lot of money. The gauges are not expensive - $15 for a nice liquid filled one. The hose and adapters can add up quickly. Post a picture of the hose connections on your loader valve . I should have everything you will need and it won't cost you sn arm and a leg. If you own a tractor and especially one with a loader this is a toolbox essential.

TOH


 
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brownell3387
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PostPosted: Mon Feb 22, 2021 7:44 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

TheOldHokie wrote:
(quoted from post at 05:50:25 02/22/21)
brownell3387 wrote:
(quoted from post at 22:31:29 02/21/21)

I do not have one Ill see if I can get one


You will need a gauge with a short hose and adapters for connecting to various test points in your hydraulic system. Don't spend a lot of money. The gauges are not expensive - $15 for a nice liquid filled one. The hose and adapters can add up quickly. Post a picture of the hose connections on your loader valve . I should have everything you will need and it won't cost you sn arm and a leg. If you own a tractor and especially one with a loader this is a toolbox essential.

TOH



Where do I start the tests? I got a hydraulic pressure gauge and connectors
 
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TheOldHokie
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PostPosted: Mon Feb 22, 2021 8:20 am    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

brownell3387 wrote:
(quoted from post at 11:44:52 02/22/21)
Where do I start the tests? I got a hydraulic pressure gauge and connectors


Excellent. First test is at one of the work ports on the loader valve. I would suggest the one that raised the loader. Remove the hose going to the cylinder and svrew the the gauge into that port. Leave the hose disconnected while you conduct test. Once the gauge is in olace start the tractor and operate the control valve as you would to raise the loader. DO NOT move the lever to the lower position - that will make an oily mess!!!

With the lever held in the raised position you have the pump deadheaded at the gauge. If the pump and relief valve are working the gauge should immediately register and hold at 1600-2000 PSI. Hold that pressure for seversl seconds to get a reliable number. After running the test reconnect the hose and report the pressure you observed. Also post a couple pictures of the valve so we can decide where to go next.

TOH
 
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brownell3387
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PostPosted: Mon Feb 22, 2021 3:24 pm    Post subject: Re: Ford 8n slow loader Reply to specific post Reply with quote

TheOldHokie wrote:
(quoted from post at 09:20:07 02/22/21)
brownell3387 wrote:
(quoted from post at 11:44:52 02/22/21)
Where do I start the tests? I got a hydraulic pressure gauge and connectors


Excellent. First test is at one of the work ports on the loader valve. I would suggest the one that raised the loader. Remove the hose going to the cylinder and svrew the the gauge into that port. Leave the hose disconnected while you conduct test. Once the gauge is in olace start the tractor and operate the control valve as you would to raise the loader. DO NOT move the lever to the lower position - that will make an oily mess!!!

With the lever held in the raised position you have the pump deadheaded at the gauge. If the pump and relief valve are working the gauge should immediately register and hold at 1600-2000 PSI. Hold that pressure for seversl seconds to get a reliable number. After running the test reconnect the hose and report the pressure you observed. Also post a couple pictures of the valve so we can decide where to go next.

TOH

So I wanted to make sure the pump was really good so I connected the gauge to the pressure line coming out of the pump it went up to 700psi then dropped all the way to 0psi and stayed there no matter what the throttle was at so Im guessing I have a bad pump just when it has a load on it
 
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