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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

JD 450B no reverse or low gear - need more help

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Jerome

09-24-2005 11:05:47




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I finally figured out why I have no reverse or low gear but high works fine. I took the top off the transmission, and there is a "pin with a sleeve around it" that is broken. There is an "arm or plate" that rotates when you move the shifting lever. This plate has two grooves or channels in it. Each channel has a sleeved pin in it. Each pin is connected to a piece that moves horizontally over the main gear shaft. When the arm rotates, the pins move in the channel causing the other piece to "select" the gear on the main shaft. One of these pins is broken, thus the piece that selects the low and revers gear doesnt move. My question is this: Can this be fixed without taking the tranny out? It looks like the "arm or plate" that rotates when you shift can be removed by taking a nut off inside the transmission thus allowing a new pin to be installed. Does anyone know if this is correct? I appreciate any info you can provide (as I am screwed right now without the dozer working) and appologize for my lack of technical knowledge to describe this better. Thanks in advance...

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Roy Suomi

09-24-2005 19:49:54




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 Re: JD 450B no reverse or low gear - need more hel in reply to Jerome, 09-24-2005 11:05:47  
Hey bud, Thats a problem , but not yours.. Low and reverse are on the clutchpack shaft in the compartment in front of the gear change compartment. There are 3 clutches on that shaft. High , low , and reverse. there is no reverse in the gear change compartment..



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Jerome

09-25-2005 06:14:09




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 Re: JD 450B no reverse or low gear - need more hel in reply to Roy Suomi, 09-24-2005 19:49:54  
Whatever is wherever, I am not sure which is which. All I know is in the front compartment, the front pin is broken. When you shift, this is the cam that moves and because the pin is gone, it doesnt move the shifter (BTW this model doesnt have a reverser). I just need to know if I am wasting my time trying to replace the pin with the top off or do I need to remove the shaft the shifters ride on.... What do you mean it isnt my problem.... it sure feels like it since my property is a wreck and if I cant get it fixed here, it wont be back.....

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Roy Suomi

09-26-2005 05:27:10




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 Re: JD 450B no reverse or low gear - need more hel in reply to Jerome, 09-25-2005 06:14:09  
Hey Jerome , Which pin is broken ?? Is it the pins on the clutch actuating shaft? The clutch actuating shaft operates the clutch valve in the manifold assembly. This shaft starts inside the engine clutch housing and goes back to the manifold at the rear of the clutchpack assembly. There is another shifter assembly that operates the HLR transmission . [ high, low , reverse ]. There is a piece of linkage that comes up the inside of the transmission case that operates the range valve [ high low reverse].Now if you're refering to the gear change section , behind the 3 clutchpacks. There are pins that move the shifters , into the 4 speeds. These pins ride in " channels" that direct the shifter to actuate the gears. The shift valve sits on top of the manifold. There are 2 5/16" bolts that hold it down. [ you will have to remove the lube line that goes over the shift valve first..] There is a small e clip that secures the hlr shifter linkage onto the shift valve.By removing the shift valve you can see the clutch valve operation.watch for the o-rings.If the problem is in the gear change section , you might be in over your head.It's quite an undertaking to repair the 4 speed shifters...

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Jerome

09-26-2005 07:25:49




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 Re: JD 450B no reverse or low gear - need more hel in reply to Roy Suomi, 09-26-2005 05:27:10  
Thanks for the advice Roy. The pin I am talking about is in the grooves on the cam that is directly connected to the shaft that the shifting linkage is directly connected to (the low high neutral reverse shifting lever between your legs. It rides in the cam groove and moves the "shifter apparatus" on the center gear shaft. The pin that is pressed into this shifter is broken and therefore doesnt ride in the groove and select the appropriate gearing when you move the shifting lever. I had a nechanic stop by today and look at it. He said there is no way to replace it without removing it. We pulled the engine, bellhousing and front tranny cover (took about 6 hours +/- with a lunch and beer break. Once the front tranny cover was off, the shaft that these two shifters ride on in the front compartment of the tranny was slid out thus "releasing" them to remove it and have it fixed. That almost worked. It still wouldnt quite come out. We had to very carefully slide the center gear shaft foraward to give us a bit more room to get the shifter out. It is on its way to a JD dealer right now for repair. While it is torn apart, we are going to rebuild the clutch (disc, plate etc), replace damaged solenoid, oil & fuel filters, fan belt, misc worn & missing bolts, obviously gaskets.... any onther suggestions to replace or inspect while we have this thing opened up? Thanks again Roy...

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Roy Suomi

09-26-2005 14:38:30




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 Re: JD 450B no reverse or low gear - need more hel in reply to Jerome, 09-26-2005 07:25:49  
Not unless you suspect another problem. I'd leave it alone. I didn't realize you had an early B . Its been so long since I've seen one of the HLR floor shift machines. Good Luck



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Jerome

09-24-2005 11:55:14




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 Re: JD 450B no reverse or low gear - need more hel in reply to Jerome, 09-24-2005 11:05:47  
I did some research and here are some proper part names. The pin with a sleeve are called a "pin fastener and roller". The arm or plate is called a "cam" and the thing that moves horizontally is the shifter. This is according to the john deere website. The part that is broken is the pin fastener. John deere part #R26206. I was wondering if I can remove the locknut holding the cam in place, thus removing the cam and replacing this pin fastener? Thanks for any help....

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