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Restoration & Repair Tips Board

9n hydraulics won't lower - looking for help

Author  [Modern View]
Will Cotter

12-17-2013 10:30:24
208.53.79.199



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Hi All,
I recently inherited my father-in-lawís 9n (I think it"s a "44 or "45), and got it running thanks in no small part to all the great info on this forum and the other 9n forums. But now Iím having three point lowering issues again.

When I first got the tractor, the hydraulics would lift the box scraper just fine, but wouldnít lower. I dropped the pump, cleaned it all out (including the tiny little ports inside the pump bushing), ran several gallons of diesel through the tranny and pump cavities, and wiped out as much of the sludge as I could. Dried it with air, put it all back together with new gaskets and a new safety valve (just in case), and everything worked great. For about two days.

Now Iím back in the same boat: it will lift fine, but will not lower unless I loosen the top bolts by the hydraulic drain tube and let some of the fluid drain out and bleed the pressure off (the test port on the bottom pump plate was welded or brazed closed at some point, so that isnít a pressure relief option right now.) Iíve pulled the inspection plate, and the hydraulic valve is definitely connected to the control arms and moves back and forth fine.

Iíve read every post I could find related to the hydraulics not lowering, and now Iím stuck. Just wondering if anyone has any suggestions of something else I could try, or do you think I just have to drop the pump and try cleaning everything again?

Thanks,
Will

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soundguy

12-17-2013 17:40:21
207.30.46.70



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
i'd be drilling thru that weld at the test port and tapping it for a pipe thread fitting. like 3/8 pipe.. etc.

it's too usefull not to have.



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Will Cotter

12-17-2013 21:23:26
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to soundguy, 12-17-2013 17:40:21  
Already got the tap kit; next time I drop the pump, that's on the list.
Thanks,
Will



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soundguy

12-18-2013 05:30:56
108.112.243.143



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 21:23:26  
if it is braze.. you will be more lucky.. :)



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JMOR

12-18-2013 06:25:51
72.181.173.171



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 Re: 9n hydraulics won't lower - looking for help in reply to soundguy, 12-18-2013 05:30:56  
Quoting Removed, click Modern View to seeWill, not to beat the point, but when you said you felt in the oil & the valve moves, I thought it important to point out that just because the 'bar' and the 'stem' moves, that does not mean that the valve spool moves. Not a hard/rigid connection.



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Will Cotter

12-19-2013 07:26:59
205.162.166.43



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 Re: 9n hydraulics won't lower - looking for help in reply to JMOR, 12-18-2013 06:25:51  
Thanks JMOR - I'll get back in there and double check that the spool itself is moving back and forth.



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Will Cotter

12-17-2013 14:41:25
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
Thanks for the clarification, Jason & JMOR. My valve assembly is complete (not broken yet!), so I think I need to try a quadrant adjustment to see if that will get my hydraulics to lower.

I'll keep you posted.

-Will



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Will Cotter

12-17-2013 13:35:02
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
Hey JMOR,

I might be confused here. Is that small metal rod the connector between the crossbar and the round valve , that goes through the spring? Or an additional piece? I have a complete valve (the whole T assembly), just not sure if that rod is an additional piece to the assembly.

Thanks,

Will



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JMOR

12-17-2013 13:58:20
72.181.173.171



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 13:35:02  
This is Ferguson, but same as Ford, except the tail oscillator/wiggler is not used by Ford.

[URL=http://s192.photobucket.com/user/JMOR_photo/media/Hydraulics_PTO/FERGY_hyd_ctrl_valve_Fergy2.jpg.html][/URL]

[URL=http://s192.photobucket.com/user/JMOR_photo/media/Hydraulics_PTO/Fergy_hyd_ctrl_valve_Fergy1.jpg.html][/URL]

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Jason S.

12-17-2013 13:53:28
174.237.40.242



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 13:35:02  
That little rod you are talking about is inside the control valve. That"s the piece you see inside the spring and goes thru cross bar. That is the piece that gets broken when someone removes the lift cover without unhooking the control valve first.



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Will Cotter

12-17-2013 13:31:27
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
Hi JMOR,
Does that little metal rod lock into the control valve somehow? Who knows how long it's been missing...

I assume if I buy a new control valve it will come with that metal rod as well?

Thanks,

Will



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old

12-17-2013 11:50:26
209.86.226.34



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
JMOR pretty much has the lift problem covered but just for your info. The 9N was made from 1939 to 1942 and the first year is what gives it the model. So if you have a 1944 or 1945 tractor it is a 2N and should have tube type radius rods. The 9N had I-beam radius rods by the way. The 2N was made from 1942 to 1947 note the first year and model are thew same as in 42=2N. Then in 1948 the 8N came out and was built till 1952. JFYI

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Will Cotter

12-17-2013 11:54:27
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to old, 12-17-2013 11:50:26  
Hi Old,
Thanks for the info - that explains the rounded rods... I appreciate the help, I'm slowly learning more and more about what I have.
Take care,
Will



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old

12-17-2013 12:14:11
209.86.226.34



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 11:54:27  
Takes time and the willingness to learn. By the way down lower is a forum just for the 9N/2N/8N fords and you will get a whole lot more answers down there



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Will Cotter

12-17-2013 13:23:34
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to old, 12-17-2013 12:14:11  
Thanks Old - appreciate the help.



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JMOR

12-17-2013 11:25:04
72.181.173.171



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
FIRST......remove the round inspection port by your right heel and reach into the oil at rear of pump & be certain that the control valve can be pulled rearward. Be sure it can easily be moved fore & aft.

[URL=http://s192.photobucket.com/user/JMOR_photo/media/Hydraulics_PTO/9N_controlvalve_fork.jpg.html][/URL]

be sure spool is moving, not just linkage

[URL=http://s192.photobucket.com/user/JMOR_photo/media/Hydraulics_PTO/9n_2n_CNTRL_VALVE.jpg.html][/URL]

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Will Cotter

12-17-2013 11:42:41
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to JMOR, 12-17-2013 11:25:04  
Hi JMOR, Thanks for the quick reply. I reached in the oil, and the control valve moves back and forth just fine, and is connected to the control arms but your picture raises a question: Is that little piece of metal next to the control valve supposed to go inside the control valve? Mine doesn't have one...
Thanks,
Will



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JMOR

12-17-2013 12:37:44
72.181.173.171



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 11:42:41  
Quoting Removed, click Modern View to seeYes sir. If it isn't there then there is nothing to pull the spool out of the bushing, therefore, no way to lower lift.



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Jason S.

12-17-2013 10:56:47
204.54.36.245



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 Re: 9n hydraulics won't lower - looking for help in reply to Will Cotter, 12-17-2013 10:30:24  
Have you adjusted the draft control spring and lift quadrant? Is the spring that hooks from the control fork to the lift cylinder still there?



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Will Cotter

12-17-2013 11:45:40
208.53.79.199



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 Re: 9n hydraulics won't lower - looking for help in reply to Jason S., 12-17-2013 10:56:47  
Hi Jason,
The spring between the lift cylinder and forks is there and seems to be in good repair, but I haven't made any adjustment to the draft control spring or lift quadrant. I'll give that a try - thanks for the info!
Thanks,
Will



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