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Author Topic: Tree farmer tranny lock up issue  (Read 1320 times)

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Offline quilbilly

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Tree farmer tranny lock up issue
« on: August 18, 2023, 06:26:18 PM »
97 tree farmer C7F transmission 4F 2R power shift 

Having problems getting into reverse. All forward gears work, I can hear the tranny pop into reverse and draw down the motor but itís acting like the neutral lock-up wonít release. Checked for blown fuses and shorts but couldnít find any. Doesnít mean they donít exist of course. Any other thoughts?

Fluid levels are normal also. 
a man is strongest on his knees

Offline Southside

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Re: Tree farmer tranny lock up issue
« Reply #1 on: August 18, 2023, 07:06:59 PM »
How does the shifter work on that model? My 92 PGS has a series of neutral safety switches on a circular, dimpled plate so basically on or off, which controls the valves for the transmission. Had one go bad and all kinds of strange things were happening.
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Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #2 on: August 19, 2023, 12:43:45 PM »
I think it works the same way. We were also thinking the same thing. 
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Offline Southside

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Re: Tree farmer tranny lock up issue
« Reply #3 on: August 19, 2023, 03:16:05 PM »
With a multi meter it was easy to depress each switch and figure out which one had gone bad.
Franklin buncher and skidder
JD Processor
Woodmizer LT Super 70 and LT35 sawmill, KD250 kiln, BMS 250 sharpener and setter
Riehl Edger
Woodmaster 725 and 4000 planner and moulder
Enough cows to ensure there is no spare time.
White Oak Meadows

Offline kiko

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Re: Tree farmer tranny lock up issue
« Reply #4 on: August 19, 2023, 06:53:32 PM »
I hope you that your issue is the forward switch in the shifter sticking.  The forward clutch and the reverse clutch are one the top shaft where the driveline comes from torque convertor.   Directly opposite on the rear of the transmission is a cap, you can take that off and get to the seals that seperates the two oil flows to the f and r clutches. Those seals could be blown allowing it to lock both clutches at the same time causing the lock down.  Unfortunately the most likely senerio is the forward clutch has failed and stacked on top of itself keeping it mechanically locked in all the time regardless of gear selection.  So it will pull in for and lock in Rev.  The transmission can be drained and suction hose removed to check the strainer for debris.  The transmission will come out the door.

Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #5 on: August 19, 2023, 07:44:51 PM »
Kiko so it will still shift to all different forward gears in that scenario?

Also we had it rebuilt about 4 years ago. I have never thought it was quite right though. Donít have tons of hours on the rebuild. Maybe 500. 

Could the pressure be the issue?
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Offline kiko

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Re: Tree farmer tranny lock up issue
« Reply #6 on: August 19, 2023, 11:27:12 PM »
Low pressure could have caused the failure, letting the clutches slip and heat. This was the most common transmission failure on the P4-376 transmission when there was a population around here.

Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #7 on: August 20, 2023, 10:57:29 AM »
Kiko would I have noticed it slipping? One thing that was happening is that I had to wait for it to warm up for about a half hour before it would go into reverse and move. But if I drove it in forward for ten or so minutes it would then kick into reverse. I never noticed the clutch ďslipĒ like you might with a car
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Offline kiko

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Re: Tree farmer tranny lock up issue
« Reply #8 on: August 20, 2023, 07:22:04 PM »
The slip could have happen on one drag. I was just finish the troubleshooting steps the others started.  You should verify that none of the swifter switches are sticking first.  If no problem  is found there then I would recommend  draining the oil and checking for clutch debris in the suction strainer. And forget that you can check the shaft seals without removing the transmission. 

Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #9 on: August 25, 2023, 12:40:06 AM »
So we swapped power between the two plunger/solonoids on the front of the tranny, underneath floor pan and for some reason it works now. Any ideas? Is there somewhere I can get a schematic of the tranny? 
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Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #10 on: August 30, 2023, 07:04:58 PM »
Finally got it tracked down. Had a bad ground on a solenoid. Very annoying. 
a man is strongest on his knees

Offline kiko

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Re: Tree farmer tranny lock up issue
« Reply #11 on: August 30, 2023, 11:46:54 PM »
Annoying and good news at the same time it seems.  I can provide that schematic. 

Offline quilbilly

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Re: Tree farmer tranny lock up issue
« Reply #12 on: August 31, 2023, 09:59:35 AM »
Is it the same one youíve posted on here before? If not Iíd love to have it. 
a man is strongest on his knees

Offline kiko

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Re: Tree farmer tranny lock up issue
« Reply #13 on: August 31, 2023, 08:21:28 PM »
It is the same .


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