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Bobcat  > Skid Steers  > transmission light is ON Bobcat 843  
 
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 Author Thread: transmission light is ON Bobcat 843
donald73d is not online. Last active: 7/20/2014 6:19:59 PM donald73d
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transmission light is ON Bobcat 843
Posted: 01/23/2012 04:40 PM
I replaced both bulbs (engine oil pressure and transmission) in the gauge cluster. Both were broken. The engine oil press. light comes on when key is turned to on but goes off once engine is running as expected. The transmission light stays on when the engine is running, at least for the three minute test I did today. I added 2 QT of fluid to bring it to exactly full and it still happens. Its warm here in upstate NY (40F) for winter. I guess change the hydraulic filter as the next step?

Bobcat 843 IBM retired Where every day is Saturday and every night is Friday night.
OldMachinist is not online. Last active: 10/24/2014 9:07:30 PM OldMachinist
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Re: transmission light is ON Bobcat 843
Posted: 01/23/2012 07:06 PM

First check wire to the sender isn't grounded somewhere.

Next put a gage into the port where the sender is to check the actual pressure. I think the light is supposed to go off between 17-20 psi.

 


Bobcat 453F ,Loegering steel tracks, Grouser steel tracks, 48" Dirt bucket, 48" toothed bucket, grapple bucket, 72" hydraulic vee snow plow and utility forks, 1954 Ford 860, 1952 Allis Chalmers CA, 1947 Case SC, Nashville IL USA
donald73d is not online. Last active: 7/20/2014 6:19:59 PM donald73d
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Re: transmission light is ON Bobcat 843
Posted: 01/24/2012 10:34 AM
Well since the previous owner probably never change the hydraulic filter, this was a good push to do it. I changed the one thats straight down under my right arm. No luck yet. Does the hydraulic fluid oil need to come up to temp before the light goes off?

Bobcat 843 IBM retired Where every day is Saturday and every night is Friday night.
Tazza is not online. Last active: 10/23/2014 8:42:33 PM Tazza
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Re: transmission light is ON Bobcat 843
Posted: 01/24/2012 01:57 PM

No, it should turn off as soon as you start the engine.

It could be a bad sender too. My 743 uses a common light for hyd temperature, low charge pressure and plugged hydraulic filter. If yours is wored the same, any of those three senders could be bad.


Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
donald73d is not online. Last active: 7/20/2014 6:19:59 PM donald73d
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Re: transmission light is ON Bobcat 843
Posted: 01/24/2012 07:55 PM
Also with skidder cold, when I turn the key to ON (but do not start it) only the engine oil pressure light comes on. Not the transmission light. And the hour meter does not work, but does when I pull it out and connect it to 12V directly. I think the dual function pressure switch is not working, or at least the part that gives power to the hour meter. Tazza - you are correct there is one temp and two pressure sender, and any could be defective.

Bobcat 843 IBM retired Where every day is Saturday and every night is Friday night.
Tazza is not online. Last active: 10/23/2014 8:42:33 PM Tazza
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Re: transmission light is ON Bobcat 843
Posted: 01/25/2012 01:50 AM
I think you are on to something. If the pressure switch does not work right, you get no power to the hour meter. A new sender shouldn't be too expensive at the dealer either.

Bobcat 763 burntSadbut i'm working on it!, 04 S150 with air and a smooshed cab, S250 turbo.
donald73d is not online. Last active: 7/20/2014 6:19:59 PM donald73d
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Re: transmission light is ON Bobcat 843
Posted: 02/01/2012 10:09 AM
I did things one at a time. I just replaced the hydrostatic filter (in engine bay) and the light does not come on when running. It did before. The old filter in there was a WIX which is not as long as the Bobcat filter. I still think there is a problem in that the trans light should come on before the engine is started. The WIX seems to be a replacement for an old Bobcat number. They changed numbers and maybe the replacement number is longer.

Bobcat 843 IBM retired Where every day is Saturday and every night is Friday night.
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