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Harry Ferguson Tractors Discussion Forum

f40 lift pressure

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03-09-2019 17:04:30

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I have went through pump with orings and relief valve and new lift piston and rings...a lot of water and sludge..lift worked ok before i did it but it sure needed the cleaning..question,i installed a 5000 psi gauge to see if it checked out...with nothing hooked to 3 point hookup no pressure showed on gauge till it was at very top.had 3000 and relief bought it down to 2700..didn't leave it there long...should you adjust the top stop down so this wouldn't happen if you pulled the control all the way up..have never checked one with gauge but looks like it would be bad to have full pressue all the time in travel setting...i adjusted top cover settings and everything works to my liking but this don't seem right but i don't know

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03-09-2019 19:49:41

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 Re: f40 lift pressure in reply to dg7766, 03-09-2019 17:04:30  
Thanks for both replys...the manual says pressure 2550 to 2750.the relief i bought is a 2700..tractor is a 1957 model and relief is identical to what i had.........lift didn't slam..comes up slow with cold 90w gl1...thanks for telling me how to set the top stop...from the both of you i gather i should not see any pressure on gauge with nothing on lift at top....i take it the only way to show pressure is to chain the arms which i by accident have already tested max pressure...it would be interesting how many tractors top travel setting is like this one...how would you know without a gauge... manual i have doesn't go into this at all..so glad i ask..thanks again

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Dan S (NY)

03-10-2019 09:07:43

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 Re: f40 lift pressure in reply to dg7766, 03-09-2019 19:49:41  
I have come across several TO35 and MF50 tractors for sale that when running and the lift arms are fully raised you can hear the engine pull down slightly as the arms go up to far and the relief valve starts blowing. I know to listen for it so I notice it but I think a lot of people have no idea it is doing that all the time. If something ever clogs their relief valve there will be a bang!


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03-10-2019 05:24:44

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 Re: f40 lift pressure in reply to dg7766, 03-09-2019 19:49:41  
That's why the "scribe line" method is used to set the lift stop, to make sure there's no pressure against the system at the top with arms empty.

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03-09-2019 19:11:10

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 Re: f40 lift pressure in reply to dg7766, 03-09-2019 17:04:30  
That pressure is more than I'd like to see, and the top stop needs reset down a bit. The system should NEVER blow the relief valve with the arms fully raised! Lift the arms by hand all the way up, and scribe a line across the arm and cover. Now with the lift stop set it to stop the arms with the scribe line 1/8 inch apart to protect the system.

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John Deere D

03-09-2019 18:41:42

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 Re: f40 lift pressure in reply to dg7766, 03-09-2019 17:04:30  
Hi ...I'am not familiar with the F40...with that said......I would do what ever the service manual suggests to ensure the lift arms / lift PISTON never slam/bottom out at the top travel.

When I check the HYD. PSI on my MF FE 35 X I secure lift arms down...see picture:

Install HYD. PSI GAUGE as per picture:

Here's a picture of a lift cover that failed..."YT" Archives....probably due to lift travel out of adjustment,and or relief valve faulty:

With lift arms secured down,as per picture, GAUGE installed,and ENGINE NOT RUNNING...Crank engine on starter with lift control lever in the UP position.

Check HYDRAULIC PSI at point relief Valve relieves.

If gauge indicates a HIGHER PSI than specified as per service manual....I would NOT operate HYDRAULIC system until problem rectified:

Bob...Owner MF FE 35 X

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Brendon Warren

03-09-2019 20:42:24

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 Re: f40 lift pressure in reply to John Deere D, 03-09-2019 18:41:42  
Same system as the 35x

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