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Restoration & Repair Tips Board

John Deere 4430 clutch problem

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Rob Lewellen

08-08-2012 07:28:00

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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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08-12-2012 17:00:20

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 Re: John Deere 4430 clutch problem in reply to Rob Lewellen, 08-08-2012 07:28:00  
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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08-10-2012 20:25:50

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 Re: John Deere 4430 clutch problem in reply to Rob Lewellen, 08-08-2012 07:28:00  
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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08-10-2012 04:54:25

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 Re: John Deere 4430 clutch problem in reply to Rob Lewellen, 08-08-2012 07:28:00  
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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