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John Deere Tractors Discussion Forum
Show Parts for Model:

4020 Wont lift 12' batwing mower

Author  [Modern View]
Dane Bumsted

01-20-2013 07:46:43
166.181.3.70



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I recently bought a 1965 4020, previous owner told me that he ran a 15 foot bat wing mower on it for years. I just bought a 12 foot bat wing yesterday to find out my tractor wouldn't fold it up. I can lift the middle deck up fine and one wing but the other wing just moves about 3 inches and wont go any further until i put a little pressure under it with my hand. I've never had any trouble with steering, braking or the 3 point.

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Retired Farmer

01-20-2013 18:11:22
64.12.117.12



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 Re: 4020 Wont lift 12' batwing mower in reply to Dane Bumsted, 01-20-2013 07:46:43  
Swap your hyd. hoses and see if it raises it. If not, hyd. cylinder may be leaking internally.



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430

01-20-2013 10:09:58
66.87.93.56



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 Re: 4020 Wont lift 12' batwing mower in reply to Dane Bumsted, 01-20-2013 07:46:43  
Could the cylinder on the mower be junk?



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donmyeil

01-20-2013 08:25:19
74.32.241.119



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 Re: 4020 Wont lift 12' batwing mower in reply to Dane Bumsted, 01-20-2013 07:46:43  
Check standby pressure and check if that side may be binding due to rusty hinge. If the stand-by pressure is low chances are the stroke-control valve in the front pump is getting bad. Most of the time dirty filters just slow you down.



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Tx Jim

01-20-2013 08:02:20
67.142.163.22



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 Re: 4020 Wont lift 12' batwing mower in reply to Dane Bumsted, 01-20-2013 07:46:43  
First thing to do if you haven't already is change hyd filter and clean sump screen, Then I'd suggest to check stand-by pressure which should be 2250-2350 psi.



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Dane Bumsted

01-20-2013 08:07:04
166.181.3.217



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 Re: 4020 Wont lift 12' batwing mower in reply to Tx Jim, 01-20-2013 08:02:20  
thank you for your reply, planning on changing the oil, filter and cleaning the screens friday.i was told that you can turn the pressure up on the pump?



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