Adding a front end loader to 4020

Cheers - Alan

Gerald J.

Gerald J.

My 148/158 manual doesn't specify the size of the cylinders but they look to be even smaler than those on the MF-236 so 5 gpm is plenty flow in my opinion. I used the flow restrictor valves on my set up for that reason. I had a 22 gpm PTO pump when the loader was on my MF-135 and it was hard to operate because the flow was too great. After that pump was stolen I put on a crankshaft driven 5 gpm pump and it was plenty. Those were open center systems.

Gerald J.

Should work, I want to use other hydraulics while the loader is mounted, so I did the tap.

Gerald J.

Once again, thanks to all of you for your input. This forum is heaven sent for novices like me.

Cheers - Alan

The elbow changed to a T down by the brake pedals works fine for me. I included a flow restrictor valve for both my loader and my back hoe to slow them for more convenient operation. That may already be a part of the 158 valve and plumbing.

My 148/158 manuals don't show the tapping parts for the early 4020, only for the later 4020 and later tractors.

I went the route of having JD parts look up that elbow and had to special order the fitting to match. It didn't fit. The place I ordered through bought the wrong one first so they won't take this one back.

To get the right part, I took the elbow (turned ut to be 3/4 O-ring to the tractor and 3/4 male JIC to the three point) and matched up a stock fitting from the JD Dealer's stock.

The official cover for the oil filter return is from a 2640, costs over $70. The cover was thick aluminum so I drilled and tapped 1/2" pipe thread and then mounted a hydraulic elbow to slow the oil a bit. So far its worked for several years. The Deere cover has a large O-ring fitting offset so the return oil doesn't hit the paper filter which may contribute to the filter lasting longer.

Gerald J.

Some "tee" into the line by the driver's right foot, which feeds the rockshaft, if so equipped, or into the bottom of the steering priority valve, which is plugged on NON three-point tractors.

All 3 methods source the oil from a common circuit, so there's NO difference in functionality betwen the methods.

I like the method of installing the "tee" in the valve under the hood, as it is easy to do, and keeps the high-pressure line more removed from the operator, "just in case".

Deere has the "tees", I don't have the part # at hand. The last time I bought one, I took the old elbow in to the parts counter, and had them match it up with a "TEE".

The oil comming BACK from the loader valve needs to return to the oil cooler/front pump charge circuit. If you do NOT do this, you will quickly loose hydraulics any time the clutch pedal is depressed. (ASSUMING it's a synchro-range.)

Deere sells a replacement cover for the tranmission oil filter that has a port built in, for this purpose. Some have simple tapped a hole in their existing filter cover.