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1972 JD 450B Dozer Not moving in forward grears


 
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JsB1
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PostPosted: Mon Apr 29, 2019 7:43 am    Post subject: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

I have read several posts that are similar to the issue with my dozer, but not exactly - Hopefully someone will be able to shed some light.
As stated I have a 1972 JD 450B dozer. A few months back I had the steering clutches and brakes replaces - all works well.
Just recently the 450B started not wanting to shift into any gear (R/H/L) upon first start up. After it warmed up for quite some time it would go into gear forward and reverse. Then it got where the transmission would not shift into Forward until operating it in Reverse for a bit. Then a few days ago I was pushing some dirt and it quit going into Reverse or Forward. It acted like it wanted to shift but wouldn't move. Finally I go it to go into Reverse after letting it sit for quite some time and got it back to the shop. It would not shift into High or Low Forward.
I read in my Service manual about adjusting the free play on the clutch and made the adjustment to 3.75". I also checked the transmission pressure which is supposed to be 170-180 psi. The pressure I recorded was less than 100 psi. I did not check the pressure when trying to shift to high or high to low.
I hope I have provided enough info explaining the situation. If you need more just let me know. Thank you.
 
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Jim.ME
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PostPosted: Tue Apr 30, 2019 2:19 am    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

Have you checked/cleaned the screen in the transmission?

You say you have the service manual, follow the diagnostic process in it. I would suggest checking all the linkages, transmission as well as clutch, and making all the adjustments as laid out in the service manual, then run all the diagnostic checks with pressure gauges, per the manual to get as complete picture of what is going on.
 
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jon corbett
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PostPosted: Tue Apr 30, 2019 2:42 am    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

screen/filter blocked
 
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JsB1
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PostPosted: Wed May 08, 2019 3:40 pm    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

CVPost-jon corbett wrote:
(quoted from post at 03:42:54 04/30/19) screen/filter blocked


Guys, sorry about being slow to get back with you. We have had lots of rain (still getting it) and a tornado came through our place on Friday. Mainly destroyed trees and fencing. Came close to the house, but thankfully no damage.
Anyway, I changed the transmission filter/screen in the tranny today. There was very little in the screen, but installed a new one. I don't know really what the issue is as yesterday during no rain I tried the dozer and it operated normally. I pushed a good deal of brush and trees. After operating it for a couple of hours I did notice that it was getting sluggish about going from forward to reverse, but it did not stop moving as it had previously.
After changing the filter and adding another 5 gallons of fluid it moved fine, but I did not get the opportunity to operate it much as it started raining heavily again. I need to check the fluid level first to make sure it is full. As soon as I get the chance I'll check the levels and the operation more in depth and let you know how it goes.
I thank all of you for your replies.
 
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JsB1
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PostPosted: Wed May 22, 2019 6:31 pm    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote


It has been a bit since I changed the transmission filter screen. I have used the dozer a few of time since, today being the last. It operated as it should until everything gets "heated up" then it quits wanting to go in reverse and is very sluggish about going into a forward gear. I did notice to day that there was a definite burnt clutch smell.
Being all considered and since changing the transmission screen, is it reasonable to suspect that the clutch is the culprit?
Any thoughts are appreciated.
 
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Jim.ME
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PostPosted: Thu May 23, 2019 2:37 am    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

Burnt clutch smell is often an indicator of a slipping clutch. Does it feel different than after your previous adjustment? Check all the adjustments again to be sure nothing changed. It might have oil on it. If you can see the bottom of the clutch housing there is a cotter pin in a weep hole. The pin should be free and wiggle, it keeps the hole open. If there is oil dripping from the hole it indicates oil getting into the clutch area. A couple possible sources of oil there could be the engine rear main seal or leaking from the reverser input shaft. You might be able to see in there though the plug you remove to adjust the clutch valve, the area should be dry.

Did you check the pressures, after you changed the screen and transmission filter, to see if they improved from the first set of readings you mentioned in your first post? You might have a couple things going on with it.
 
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JsB1
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PostPosted: Thu May 30, 2019 5:48 pm    Post subject: Re: 1972 JD 450B Dozer Not moving in forward grears Reply to specific post Reply with quote

Jim.ME wrote:
(quoted from post at 03:37:46 05/23/19) Burnt clutch smell is often an indicator of a slipping clutch. Does it feel different than after your previous adjustment? Check all the adjustments again to be sure nothing changed. It might have oil on it. If you can see the bottom of the clutch housing there is a cotter pin in a weep hole. The pin should be free and wiggle, it keeps the hole open. If there is oil dripping from the hole it indicates oil getting into the clutch area. A couple possible sources of oil there could be the engine rear main seal or leaking from the reverser input shaft. You might be able to see in there though the plug you remove to adjust the clutch valve, the area should be dry.

Did you check the pressures, after you changed the screen and transmission filter, to see if they improved from the first set of readings you mentioned in your first post? You might have a couple things going on with it.



Sorry about getting back...Rain and other things going on. I do have a question. When checking the transmission pressure through the bung fitting should fluid be shooting out through that hole? I have my pressure gauge installed correctly but fluid pumps out through the bung hole opening. Wondering if this may indicate a problem.
 
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