JD 450C hlr trouble in reverse only

[Dkc923]

Needing some help with a 450c I recently purchased. I bought the dozer knowing it needed steering clutches and brake bands. I just finished changing steering clutches and brake bands on both sides and now it turns perfect just as she should. The problem I have now is that it has no power in reverse. It will move if its in gear 1 and on flat ground but don't even attempt to climb a hill. I went through the entire sequence of clutch and pressure adjustments (followed Roy Suomi's post on how to do it). Ive managed to get my free play just right and my pressures dialed in to 185psi all except for reverse. Its 185 in neutral, L,and H but in reverse its about 125. Ive changed hydro filter and cleaned screen in side of transmission. Changed fluid twice to get it good and clean because the old fluid had a lot of water in it and was milky. I just wanna get this thing working like it should so I can use it. Ive enjoyed working on it but its starting to get frustrating because I want to be able to use the thing. My assumption is its gotta be something in the transmission at this point with my pressure only being low in reverse but I just need to know what to do next. Im assuming pull the top cover? Once top cover is pulled what do I look for? I sure would appreciate any advice.

[dtoots1]

Hang in there...s/b some with 450c experience to help guide you...
add your location to your profile...someone may be nearby to look see!

[B Town]

Your situation as you have described sounds like the reverse clutch pack is slipping. I would be suspicious of leaking oring in the reverse pack.

[Dkc923]

yeah it definitely feels like it is slipping. Im guessing my next step would be to pull it and see what I can find out on it. To remove it I just need to pull everything back off the top to be able to pull the transmission top cover and I will need to remove the engine as well correct?

[B Town]

Yes, engine will need to come out. Several good things that you don’t need to remove. Final drives, steering clutches. Sorry for you situation. When done it will be a great machine.

[Dkc923]

that is great news!! I wasn't sure if I needed to break the tracks and pull axles out again or not. Thats a huge relief because geez those steering clutches and brake drums are heavy. From what I've read pulling the engine isn't a huge job if I remember correctly. Doesn't look like there is too much to it.

[B Town]

The engine is mounted with four bolts to the bell housing. The unfortunate thing is that all the stuff attached and ahead of the engine need to come out.

[Dkc923]

I gotcha. I will probably try to pull it with radiator and hydraulic pump all still attached and just pull them all as one. When I get the hlr out would I be able to replace the seals in it or would I need to purchase a remanufactured one?

[B Town]

The HLR is something that can be re-sealed.

[Dkc923]

Thats good news. Will probably start pulling everything off the top this afternoon and pull the top cover off of the transmission.

[Dkc923]

Made some progress this morning. Got everything pulled off the top and the top plate off the transmission. Also went ahead and pulled the engine. Do you know in which order the hlr clutches are in the transmission on the shaft? From front to back I'm curious which pack is in the middle because from what I can see there is no lining at all left on the the disc. The front and rear pack look to still have decent linings on them. There was definitely some water that sat in it for a while as there is some rust spots in the transmission. Also, when we got the engine out the splines on the input shaft that go inside the engine clutch are worn really really bad. Definitely gonna have to replace that shaft. The throw out bearing is in pretty rough shape as well. I'll probably go ahead and rebuild the engine clutch while I'm in there and replace that bearing. I took several pictures and am gonna upload them on here so you can see if I can figure out how to do it. Thanks again for the help.

[Dkc923]

Well the hlr is finally out of it. Won't lie it's a pretty good bit of work to get it out. Waiting on parts now to rebuild hlr and then gonna go back together with it. Can't wait to get this thing finished up.