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· Registered
1,377 Posts
Discussion Starter · #1 ·
HI guys,

I have an 89 322 which is exhibiting low implement pressure. The TM1591 states implement pressure should be between 850-975psi.

Background info: I purchased a 3000 psi hydro gauge with the correct JD quick connector a few years back and I tested the pressure at my front hydro ports (at that time) @ 950psi. Recently I observed my OR Bilt FEL's sluggish movement and apparent lack of gusto when picking up some heavy objects that it previously lifted w/o issue. This made me check my pressure reading again. Yesterday it showed 800psi.

Additional info: my rmps are slightly low (using my coil wire style tachometer, permanently installed on my 322) at 3300-3350 rpms. I will double check this reading tonight with my laser tach which is very accurate. Also, I can not remember when the hydro fluid was last changed, but I will check my notes at home. most likely in the last three years and I average 30-50 hrs per year. Hydro fluid is clear and level is good.

As I read through the TM1591, looks like I need to check the pressures at the hydro. I will need to pull my cozy cab and fender pan to do this.
Here is what I plan so far unless you guys recommend something else first.

1)conduct a charge pump pressure test and possibly adjust the charge relief valve.
2) conduct an implement pressure test and adjust the implement relief valve if necessary.
3) conduct a charge pump flow test.

It is noted that any adjustments to the relief valve will only improve conditions if there are no other internal leaks anywhere. I hope I don't have any internal issues. What might they be if I do?

Anything I should do before I remove my cab and fender pan?

Thanks guys.

· Registered
939 Posts
Are all your hydraulic levers in the center detent position? Make sure one is not in the down or "float" position.

This may not be your cause but I will mention it just to cover all bases - When you changed fluid, did you also change the filter? Is it the Deere filter recommended for your 322?
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