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4020 Wont lift 12' batwing mower


 
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Dane Bumsted
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Joined: 20 Jan 2013
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PostPosted: Sun Jan 20, 2013 7:46 am    Post subject: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote

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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Tx Jim
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Joined: 14 Feb 1999
Posts: 17691
Location: Coyote Flats,Tx

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PostPosted: Sun Jan 20, 2013 8:02 am    Post subject: Re: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote


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
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PostPosted: Sun Jan 20, 2013 8:07 am    Post subject: Re: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote

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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DONMYEIL
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PostPosted: Sun Jan 20, 2013 8:25 am    Post subject: Re: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote

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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430
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PostPosted: Sun Jan 20, 2013 10:09 am    Post subject: Re: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote

Could the cylinder on the mower be junk?
 
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retired farmer
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PostPosted: Sun Jan 20, 2013 6:11 pm    Post subject: Re: 4020 Wont lift 12' batwing mower Reply to specific post Reply with quote

Swap your hyd. hoses and see if it raises it. If not, hyd. cylinder may be leaking internally.
 
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