Ford 1500 hydraulic pump

[RichardLThompson]

I am new to the forum. I just bought my first tractor: Ford 1500 (1979). I got a real good deal including several of attachments. Well I found out my why it was a good deal. The hydraulic pump is bad. It worked good enough when I tried the tractor I tested it so I bought the tractor. It is still a good deal if I can find a pump. Any one have one or a line on one?

 

[jones6780]

Are you sure it is the pump and not a dirty screen/filter or low oil level or weak pressure valve. Could be just worn lift cylinder "O" ring.

 

[RichardLThompson]

Are you sure it is the pump and not a dirty screen/filter or low oil level or weak pressure valve. Could be just worn lift cylinder "O" ring.

I cleaned the screen, I rebuilt the pump (new seals), I had the pump volume tested - it's putting out 2 gallons per minute, should be 6.5 gpm.

 

[andreiwright]

I am not against ford but I bought the same part at Ford but after a week the pump has leak. I returned it and have a new one as a replacement but here it goes again the pump went really bad.

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[jones6780]

Did you check the pump gear and end clearance when you replaced the seals the pump?

 

[RichardLThompson]

Did not do this. Do you know what the clearance should be? And would this make a difference in the volume per minute that it would pump?

 

[jones6780]

View attachment Oil Pump.PDF

Excessive wear/clearance will allow oil to seep past and not be pumped as designed. How did you measure flow rate, was pump turning at the correct RPM?

 

[jones6780]

If you rebuild the pump there is a "break-in procedure" with specified rpm for a period of time at no-load and progress to a pressurized for a specified time and test temperature to not exceed.

I would think that a pressure gauge would be a better method than flow rate.

 

[RichardLThompson]

Was measured at a tractor dealer/maintenance business on a special machine.

 

[jones6780]

Whats your next step?

 

[RichardLThompson]

The pump was "rebuilt" but had only the seals replaced. Did not have access to gears/bushings. When the seals were replaced the mechanic said that the original ones in it looked pretty good. I suspect the previous owner possibly replaced them prior to selling and found that it did'nt solve the problem and sold it.

 

[RichardLThompson]

Current update and problem. I found a new pump and when I went to install it I thought I would check the filter screen one more time. Now I had cleaned this prior to all my hydraulic problems and put in new fluid. But when I rechecked it it was pluged again (looked like silicone or something like it). I also noticed that the fluid at the screen was a dirty black color but that the fluid at the dip stick was still very clean. I cleaned and reassembled the screen and everything worked fine. I figured that when I had the volume testing done that they forced a plug somewhere to come free and it plugged the filter. I ran it about 4 hours and the problem reoccured. I took it apart again and again it was dirty. Cleaned it and it works fine. I had a fitting that I replaced and it leaked a little so I used silicone tape to seal it (still leaks). Could it be the tape getting sucked into the system? Is there a way to filter the whole system? Someone suggested that I should take the large tube that feeds the pump free and make sure that is clean. Any comments or suggestions?

 

[RichardLThompson]

Current update and problem. I found a new pump and when I went to install it I thought I would check the filter screen one more time. Now I had cleaned this prior to all my hydraulic problems and put in new fluid. But when I rechecked it it was pluged again (looked like silicone or something like it). I also noticed that the fluid at the screen was a dirty black color but that the fluid at the dip stick was still very clean. I cleaned and reassembled the screen and everything worked fine. I figured that when I had the volume testing done that they forced a plug somewhere to come free and it plugged the filter. I ran it about 4 hours and the problem reoccured. I took it apart again and again it was dirty. Cleaned it and it works fine. I had a fitting that I replaced and it leaked a little so I used silicone tape to seal it (still leaks). Could it be the tape getting sucked into the system? Is there a way to filter the whole system? Someone suggested that I should take the large tube that feeds the pump free and make sure that is clean. Any comments or suggestions?

 

[RichardLThompson]

Well, I took both tubes off, the pickup tube and the return tube, and they appeared to be unobstructed. I flushed them and put them back on. However, I think I found the problem though. The pipes had been taken off previously and the o-rings on the smaller pipe was replaced with smaller o-rings. It looks like they used silicon paste to hold them in place when installing, as there was some on all the o-rings, and maybe they intended to have the paste make up the difference in the smaller o-rings. I drained the hydraulic fluid out, it was pretty dirty even though it only had about 5 hours on it. It was suggested that I may have to drain it one more time.

 

[jones6780]

Read post #8 http://www.tractorbynet.com/forums/new-holland-owning-operating/88973-sos-i-have-my-first.html

JC had thick "snot" in the bottom of the hydraulic reservoir that would not drain and had to vacuum it out.