4430 Slow loader hydraulics when in a forward gear

Loader is slow and shaky, sometimes wont even move when transmission is in a forward gear. Works fine when the tractor is not in gear or in a reverse gear. This is a Quad range 4430, 260 self leveling loader. Any ideas as to what the problem may be?
 

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Sounds as if the hyd hi-lo has a bad seal or possibly broken clamp on hi-lo shift line. Does loader lose hyd power in both high & low speeds of 2-speed?
 
That don't make sense,,same components used in both directions...since she said it was a Quad Range...
 
This is my daughter asking the question. They run the tractor most of the time to move round bales, manure, etc.

Loader is plumbed using a power beyond block on the left side SCV. We have a Deere manufactured joystick kit that we installed to control the loader. Both supply and return go to the power beyond block. No ported cover.

My use of the tractor shows that when in low idle, we get quite a lot of vibration in the lines. I was thinking that the charge pump may be weak at low rpms. When we run it above 1500 rpm it runs much better. I have observed that if you try to use the loader while turning the steering, you will see it slow down. I have not observed this overall slowdown since I run it very seldom.

I will get her to better describe the slowdown.

I assume there are some priority valves in use. Can someone describe how they work?

I picked up a new filter and plan to change that out as well as check the sump screen.

John
 
The priority valve is located where the oil enters the rockshaft at the front right side, they seldom give any trouble,,the valves is set to shut the oil supply off to the rear functions if the stand by pressure goes below 1750psi, this lets you maintain steering and brakes, if the pressure gets weak or low at lower RPM's it could be,1-filter plugging, 2-sump screen plugged, 3-weak charge pump... When she said it worked in reverse but not forward, that confused me..The way you have the remote hooked to the power beyond is okay...
 
Hi Tim, et.al.

Finally got some nice weather and am proceeding to clean the sump screen and replace the filter. Looking for the sump screen plug, I found this -

5561.jpg


The line routes along the frame up to the front pump here -

5562.jpg


It is the big green hose in the foreground. It goes into some sort of a fitting - perhaps a filter? Then it loops around to the top of the pump. I am guessing that someone rerouted the pump return into the sump screen. Is this kosher? Is there likely to be a sump screen under this fitting that is accessible? Could this filter (if that is what it is) cause weak return flow and contribute to the slow loader hydraulics?

Worried...

John
 
I just did away with another of those,,they were put on after delivery,on the early ones,,some thing about cold oil letting the PTO or clutch drag,,they didn't make any difference as far as I ever saw,,I put a dozen or so on when I worked at the dealership in the early 70's,,I have taken more than that many off since then. You can ether get a new plug or cap that one with a #10 plug and washer with o-ring insert,,go up front and remove that funky valve and Tee fitting...
 
So, on the back, I can remove all of that stuff and get a regular cap from Deere? Please explain the #10 plug approach more fully. What do I cap the front with - will a black pipe plug of the appropriate size do? I bet with all of that stuff covering up the sump screen it was rarely serviced with any frequency.

John
 

correct plug to replace bushing(key 4) R40147 Fitting ADD 17.51 USD. One needs no fitting for frt of tractor just slip longer hose on fitting where hose(key 12) was located then secure clamp.

mvphoto5577.png
 
Wow Jim, you are good! I just spent 30 min on the jdparts site trying to find this. OK, My plan plan is to remove all of that stuff and put a regular cap on the back.

I still don't fully understand what you are saying about how to close off the front. Can you try again. Also, the pic is clipped so I can't see what is connecting into the front pump.

How much oil will I have to drain?

John
 

Photo doesn't show what hose(key 12) attaches to BUT IIRC it attaches to oil cooler. A visual inspection would reveal what it attaches so remove the other hose attached to tee not shown then attach it to where hose(key 12) is attached.

mvphoto5578.png
 
ok, I understand. I did not see the tee until I looked closer in my second picture. BTW hose 12 attaches to a right angle fitting that is mounted on the top of the pump.

Thanks much,
John
 
Remove and discard the stuff in the red circle,,attach the hose coming from the oil cooler to the top fitting on the pump.. the hose in the green circle will be the hose going to the back to the sump screen.
a177036.jpg
 
Well, got the issue resolved it seems. The main filter was quite dirty and much heavier than the new filter. Sump screen was not too bad. Removed all of the superfluous piping and buttoned it back up. Loader speed seems much improved!

thanks guys!

John
 
I still don't understand how that affected the loader more going forward and not in reverse???? But I'm glad it's working better now..
 
Is it possible for the return plumbing, that was removed, to have been leaking under a vacuum causing the transmission/charge pump to aerate?

(quoted from post at 09:12:58 11/05/17) I still don't understand how that affected the loader more going forward and not in reverse???? But I'm glad it's working better now..
 

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