JD 4430 power steering problem

lemroy

Member
I changed the main filters and cleaned the screen that is located on the firewall under the hood and the power steering is still hard to turn. This is a 1977 model. Any help would be appreciated. Roy
 
I have seen this problem several times, It can be one of a couple things. It makes you think there is resistance in the steering "Brick" or valve under the hood but that is rarely the reason, and a good thing to, they are Pricey. The little filter is rarely the problem ether,, but the check valve in the metering pump at the base of the steering wheel is a lot of times the problem, as it can let too much low pressure oil back past from the charge circuit to enter the pump. If you decide to change this out take the extra time and labor to "up Grade" the fittings and do away with the push on lines that use a clamp to hold them on with the stuff from a 40 series unit. You will be changing the 2 hoses and the 4 fittings to change them to JIC connectors, a much better set up, make sure that you pay attention to where the check valve fitting needs to be. I will try to show you more about this after while, it is an up grade that will also do away with pesty leaks under the dash..and possibly fix your problem. The steer motor can also be suspect.
 
AR86492 Hydraulic Hose ADD 34.87 USD 34.87 USD
AR86490 Hydraulic Hose ADD 43.07 USD 43.07 USD
R55243 Shim ADD 1.06 USD 2.12 USD
AR88771 Check Valve ADD 82.74 USD 82.74 USD
R68220 Fitting ADD 19.12 USD 19.12 USD
R28776 O-Ring ADD 1.09 USD 4.36 USD
R72858 Seal ADD 5.88 USD 5.88 USD
R27272 Fitting ADD 6.01 USD 6.01 USD
R26286 O-Ring ADD 1.30 USD 1.30 USD

Parts that have an issue will display a flag. *Subtotal 199.47 USD
*Total 199.
 
I'm having trouble with a parts pic, but go to 4440 steering metering pump, and rear steering lines in the parts site to see what i'm talking about
 
Tim I'll give you a little help.
mvphoto19319.gif

mvphoto19320.gif
 
Yep that's what I was trying to get on
there,,seemed like every time I would set the
image it took over the entire screen,,Darn it,,I
am having a bit of trouble with my Mozilla
program,,waiting on my "Geek" to make a house
call...Changing these over helps a lot with those
darn push on hoses and the check valve is a lot of
times the reason for hard steer, I haven't found a
real good way to prove these yet, but I am working
on a way to bench test the metering pump on my
stand...
 
Could I have air in the lines since I had several lines disconnected? I can cycle the steering wheel several times and the PS works for a while. Thanks for your help. Roy
 
No, air in the lines has a way of purging it's self out,,I'm still leaning to the check valve in the steering metering pump. You will need to disassemble it to remove the valve fittings, and it's not as bad as it seems...
 

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Back
Top