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Show Parts for Model:

4030 Hydraulics

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Randy H.

07-09-2014 07:53:24

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Recently I have been losing speed in my loader when I carry any kind of load in my 3 pt hitch. I am thinking the seal on my internal ram for the 3 pt. Before I tear it apart could it be anything else? Also, how big of a job am I in for if this is the problem? thanks

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Tim S

07-09-2014 18:35:35

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 Re: 4030 Hydraulics in reply to Randy H., 07-09-2014 07:53:24  
Rarely is it the piston seal,, and it will pop out the rear 4 bolt cover, easy,, go ahead and look at it but your problem is most likely valve ajustment...

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07-09-2014 19:45:42

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 Re: 4030 Hydraulics in reply to Tim S, 07-09-2014 18:35:35  
thanks for the advice. I was thinking it was the piston seal as the 3pt settles quite quickly after shut down. If it was valve adjustment which ones and how would I go about that. thanks again.

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Tx Jim

07-10-2014 03:35:12

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 Re: 4030 Hydraulics in reply to randyh., 07-09-2014 19:45:42  

To start with I'd recommend to adjust L/D & rockshaft control linkages following the adjustment procedure outlined in a JD 4030 service manual.

Adjusting clearance on rockshaft control valves is accomplished by turning screw(parts key 2)

Access adjusting screw by removing plug(parts key 34)

This post was edited by Tx Jim at 03:39:39 07/10/14.

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07-10-2014 11:49:07

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 Re: 4030 Hydraulics in reply to Tx Jim, 07-10-2014 03:35:12  
I went and set the load adjustment to max and turned the set screw for 3pt drop tighter. It seems to work better now, could it really be that simple? thanks

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Tx Jim

07-09-2014 08:28:08

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 Re: 4030 Hydraulics in reply to Randy H., 07-09-2014 07:53:24  
Rockshaft piston seal is easy to R&R by removing external piston cover. Is L/D control lever in minimum?
This post was edited by Tx Jim at 08:31:14 07/09/14.

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07-09-2014 15:52:05

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 Re: 4030 Hydraulics in reply to Tx Jim, 07-09-2014 08:28:08  
I have tried different positions on LD lever, does not help. Tractor has a cab on it, will I need to lift it off to get at the plate? thanks a bunch!

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