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Rob Lewellen
New User
Joined: 08 Aug 2012
Posts: 1
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 Posted: Wed Aug 08, 2012 6:28 am Post subject: John Deere 4430 clutch problem |
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I have a 1975 John Deere 4430 quad range that the clutch has started slipping in all gears. System pressure measures 2250 psi. At the clutch port I only have 50 psi and oil is airated. I removed the rockshaft housing and checked the cast iron plate underneath for cracks and it was ok. Now I'm stumped. Any help greatly appreciated!!
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buickanddeere
Tractor Guru
Joined: 31 May 2003
Posts: 23638
Location: in front of computer
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| Posted: Fri Aug 10, 2012 3:54 am Post subject: Re: John Deere 4430 clutch problem |
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Given the vintage and hours. Odds are it needs the uptime trans oil pump. A clean screen and new filters. Is the pto valve moving full stroke to. 100% open?
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JDseller
Tractor Guru
Joined: 09 Jul 2010
Posts: 4483
Location: North-East Iowa
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| Posted: Fri Aug 10, 2012 7:25 pm Post subject: Re: John Deere 4430 clutch problem |
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The problem is in the Hi-Lo clutch pack not the main clutch. The power shift Hi-Lo(1-2 or 3-4 shift) uses oil pressure to engage. 50 PSI is way low. It should be in the 135 PSI range. You need to split it and check the Hi-Lo clutch pack out. I would bet that you have blown an oring in a piston. I would rebuild it completely while I was in there.
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430WLPG
Long Time User
Joined: 03 Aug 2004
Posts: 1059
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| Posted: Sun Aug 12, 2012 4:00 pm Post subject: Re: John Deere 4430 clutch problem |
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The main clutch shares the same oil with the two speed and the pressure should be 185psi if it's been run long at 50psi they are all burnt up
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