JDcrawlers Messageboard

Thanks Dr. The Tech Manual is a little lacking.

Finally had a chance to check the pressure on the transmission pump. Set the transmission in neutral started it up and the pressure hit about 110 at 1800 RPM. I put three washers in the regulating valve and the pressure did not move. I put in two more and still no movement. I put in one more shim an...

sullyt28 wrote:Due to the number of bends I was hoping to find a factory type replacement. Sounds like I'll have to go this way. Thanks for the replies.

I have a 450 but that entire circuit was available online aftermarket.

If you replaced that drive without taking off the nose you are my hero. You either have small hands or the patience of a saint. For me getting the nose off is a 2 person job. WHen I saw your picture I did a quick search on the drive and shaft. Saw what JD wanted and what the others were selling tha...

From looking at the picture you ended up changing the drive and the shaft. That would certainly make a sound like the pump is bad. Did you get the parts from the JD dealer? The splined shaft was actually in pretty good shape surprisingly enough so I did not have to replace it. Bought all the parts ...

Looks like that screen is in the accumulator itself. According to the Tech manual the accumulator is in the range change compartment of the trans. Looks like the cover would need to come off to get it out.

Looks like there is a small screen in the accumulator valve. I don't see any kind of filter in the manifold and shift valve.

Not quite what I was expecting. The old pump was working just fine but I changed it anyway as the rear seal had a small leak. All in all it was a pretty easy fix.

A couple of questions for those of you who have conducted major fluid changes in the past. I don't want to have to reinvent the wheel when I have your experience to draw from. I plan on changing the transmission fluid (9 gallons) and the hydraulic fluid (13 gallons). First, what are you guys draini...

You may have fried the pump. I know mine is a gear pump and generally speaking they aren't rebuildable. You can try taking off the nose and loosening the inlet line to the pump to make sure it is getting oil. Bit the bullet and purchased another pump. I could hear a pretty good rattle from the pump...

When you say quit working, do you mean nothing worked or things operated slowly? That is the return filter, that wouldn't make the hydraulics stop working. When it gets clogged it will spit open like you see. See if you can cut it open, if so look to see what the debris is. Since it was 2 gallons l...

Was working the dozer when the hydraulics quit working. Checked the fluid level was about two gallons low. Put in more fluid, nothing. I have changed every filter on the dozer except the hydraulics so I pulled the cover off and found this little jewel. I suspect this is the culprit. My question is i...

Straight 350 service manual in PDF downloadable is $118.00 and is likely 600+ pages. I highly recommend you get the parts manual as well. If you just have to have a hard copy burn the PDF to a disk or USB stick and let the local office supply make you some hard copies.

Just purchased a 450C. I changed the fluid in the transmission and the steering clutches, fluid looked like milk. The dozer pushes good for about an hour but then has trouble pushing in 1st. I plan to change the fluid again this weekend to see if it helps. I changed the spin on filter but still need...