New JD 440

[fictional31m]

Just picked up a 440 but had some basic questions my blade is a 6 way hydro powered blade but I don’t seam to have much down pressure on the blade it raises up when dragging and digs in when pushing all hydro works but very slow is this normal?
second question is how do I grease the bottom rollers I don’t see any fittings for grease no button head either

third question on tightening the tracks I see a center threaded bold and it has a grease fitting so do I loosen the nut and screw the screw out or is it adjusted with a grease gun?

[1010c]

I dont have a 440 but i think it is similar to my 1010 your problem with your blade is that it is in the float position ( no down or upward preesure). Your rollers have probally been replaced with sealed units ( no matiance). So their is no way to oil them. And your hydralic tensioner is tensioned using a special grease gun and that button head fitting on it. The bolt is for un tensioning. Hope this helps

[Lavoy]

If not in float, then air in lines, or cups are bad in the cylinders.
Lavoy

[fictional31m]

My blade set up is like the one pictured here
http://www.jdcrawlers.com/messageboard/ ... 9d185f6e36

on my control valve on the blade up and blade down when you push the lever to make it go down it has a "lock" like a log splitter is that float mode?

should there be enough force on the down pressure to lift the front of the dozer up at-least?

on the mc I have it would lift the front of the tractor easy and seamed to move the hydraulics much faster

also on my track adjuster there is a standard zerg fitting on the side

[1010c]

The dozer should have enough down pressure to lift the front of the dozer. Is the tensioner zerk on the side Or on the top. mine is on the top of the cylinder. If it is a standard zerk someone has replaced it. it is 1/8 pipe thread both standard and button head fittings are available in this size

[jtrichard]

on the adjuster just use a regular grease gun to adjust..... YES the lock on the valve is float just before it locks is full down pressure and it should lift the front of the crawler off the ground

[fictional31m]

Interesting I’m getting no lift off the ground I wonder what could be causing it to not lift I don’t think a pump could cause that?
The other cylinders for tilt and angle don’t seam very strong either and very slow movement its not a jerky movement and fluid is full just acts like a very low GPM pump any ideas where to start troubleshooting?

[Lavoy]

Pump bearings could be worn, you could do a pressure test to see if system pressure is correct. As for the up and down on the blade, as long as pressure is good, I would still blame it on the cylinders.
Lavoy

[fictional31m]

ok so i fired it up an pushed lever in just before it locked and slowly it lifted the tractor up very slowly but fluid was nasty looking and thin so I changed it to some new stuff after changing the fluid it worked a little better but after cycling blade up and dropping it and then going for down force its very slow it seamed to work fast as I was adding more fluid and I noticed tiny air bubbles in the fluid tank I’m thinking maybe the pump or the intake line is sucking air maybe?
the engine that’s on this machine is really similar to the mc I have I think same hydro pump
the engine does have a water pump/theremo housing but block is painted green while dozer is yellow

[Lavoy]

If the block has the dipstick on the RH side, it is the correct block. Pump is similar, but larger. Yes, you could have an air leak, and you will likely need to change the fluid again as the old fluid works out of the cylinders and lines.
Lavoy

[fictional31m]

Dipstick is on the carb side tractor data says 4.25 gpm on the pump that seams very low

[Lavoy]

Then you have a 420 block, but displacement is the same.
Tractor data is wrong almost always on older stuff. Pump on a gas is about 9GPM at 1000PSI.
Lavoy

[fictional31m]

I have another pump from an MC would it be better or? they look identical but that’s just going by shape/location of lines
just trying to determine the cause of the slow hydraulics it takes about 2-3 minutes of holding the control lever and it lifting front

[Lavoy]

MC pump is different, lower volume, suction line will not hook up. Have you verified that you don't have an air leak in the suction line?
Lavoy

[whiteclipse16]

I somewhat agree with Lavoy on the pump and/or cylinders.

A simple check would be to check your relief valve spring and setting. If the spring is broken you will have very low pressure. Mine was broken into 4 pieces, however my blade would not lift the front of the machine.

It may also not be adjusted correctly.