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John Deere Tractors Discussion Forum
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4430 Powershift transmission pump ?

Author  [Modern View]

05-21-2013 15:26:21

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Looks like I m going to have to put a charge pump in the transmission on my 4430 it only had a maximum of 6 gpm when they checked it with a flow meter. Does everyone replace the whole assembly or just the parts inside ? Are they available from somewhere besides Deere as a rebuilt unit like the clutch packs are ?

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05-24-2013 18:35:25

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 Re: 4430 Powershift transmission pump ? in reply to jd720, 05-21-2013 15:26:21  
the trans. pump rarely goes bad. you need to hookup a 100 psi gauge to the lube port on the traction valve housing. engage pto on & off to see if one position robs your pressure which should be 10 psi or higher. then look for trans. element internal leak by shifting thru each gear looking for 5psi or more drop. next put a destroke screw in main pump. with oil warmed up watch gauge & destroke pump. if pressure raises you have a high pressure internal leak & this robs your overall hydralic performance. if so go around & feel your control valves after a 15 min. run to see what is heating up. fix the hot spot.

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05-21-2013 17:48:13

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 Re: 4430 Powershift transmission pump ? in reply to jd720, 05-21-2013 15:26:21  
I believe it also provides the front pump and that is the problem. The front pump isn t getting enough flow so the hitch chattersas it goes up and sometimes you loose the steering and brakes.

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Tx Jim

05-22-2013 04:17:34

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 Re: 4430 Powershift transmission pump ? in reply to jd720, 05-21-2013 17:48:13  
Yes you're correct as frt pump must be supplied oil as it can't suck oil. If one of the components I listed is leaking badly enough the leak could rob flow from the trans pump.

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Tx Jim

05-21-2013 15:42:02

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 Re: 4430 Powershift transmission pump ? in reply to jd720, 05-21-2013 15:26:21  
It's been a long time since I was a service manager but I thought 6 gpm for trans pump was sufficient.

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05-21-2013 15:59:06

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 Re: 4430 Powershift transmission pump ? in reply to Tx Jim, 05-21-2013 15:42:02  
The bad thing is it goes down to almost nothing when you idle it down.He took the valve off and is going to take it apart to see if anything is bad in there. I guess if the valve is all good then it will need a pump unless there is something else to check ?

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Tx Jim

05-21-2013 17:39:30

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 Re: 4430 Powershift transmission pump ? in reply to jd720, 05-21-2013 15:59:06  
The pto clutch/brake and trans are operated from trans pump pressure.

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