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Author Topic: 450 timber jack skidder automatic transmission  (Read 2703 times)

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Offline TUCKER 2005

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450 timber jack skidder automatic transmission
« on: June 15, 2015, 09:05:35 PM »
I have a 450 timber jack skidder with a automatic transmission it backs up in all 3 gears but pops out of gear when you go forward . I [put a new transmission pump in it did not help any ideas

Offline kiko

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Re: 450 timber jack skidder automatic transmission
« Reply #1 on: June 15, 2015, 10:11:27 PM »
Slack in shift cable or shifter it self not allowing complete forward engagement before shift lever hits it's stops.  With machine off shift from reverse into forward then locate where shift cable attaches to transmission control valve, you  will likely find it not detented into forward all the way.  If trans pressure drops when forward kicks out it is likely internal.

Offline TUCKER 2005

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Re: 450 timber jack skidder automatic transmission
« Reply #2 on: June 15, 2015, 10:25:27 PM »
could it be oil leaking by   shift spool

Offline thecfarm

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Re: 450 timber jack skidder automatic transmission
« Reply #3 on: June 16, 2015, 06:48:21 AM »
TUCKER 2005,just want to welcome you to the forum.
Model 6020-20hp Manual Thomas bandsaw,TC40A 4wd 40 hp New Holland tractor, 450 Norse Winch, Heatmor 400 OWB,YCC 1978-79

Offline so il logger

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Re: 450 timber jack skidder automatic transmission
« Reply #4 on: June 16, 2015, 06:06:06 PM »
Welcome to the forum, mine leaks a little oil around the shift spool. it only does when shifted from rev to fwd without using declutch. I even replaced the seals, I have the 4 speed clark. I can't help you on the other problem sorry. Kiko know's his stuff  :)
stihl ms 660's 661's husky 395's 450c tj Learning something new everyday

Offline kiko

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Re: 450 timber jack skidder automatic transmission
« Reply #5 on: June 16, 2015, 11:12:31 PM »
Thanks for the compliment So IL.  I just like to share what I know and increase my knowledge from people that have had different experiences than me.  If I accidentally start talking about the internal workings of a skidder in mixed company everybody develops a blank stare as it is obviously going to be a one way conversation.  This is one of the few places I can let it out. Anyway,  It is not to likely that the shift spool is bypassing, although it is theoretically possible .  Watching trans pressure is key to diagnosing transmission problems.  What does the pressure do when when it won't go forward? 
Your skidder has a 2800 Clark transmission.

Offline xalexjx

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Re: 450 timber jack skidder automatic transmission
« Reply #6 on: June 21, 2015, 09:36:02 PM »
does the prime pressure drop when shifting? could be the shift forks or linkage or cables wore, there is an adjustment on the end of the cables on the transmission side. Where are you located?
Logging and Processed Firewood


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