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post #1 of 24 Old 01-02-2008, 11:29 AM Thread Starter
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It's Back! Bobcat Error Code 50-56

I experienced a drive issue in September (see posting Error Code 50-56) which seemed to have resolved itself after going through a lot of dismantling and reassembling. Now the issue is back with a twist. The most recent occurrence did not show an error code at first. Error Code did show up after multiple events. Now this particular ToolCat will come to an immediate stop (engine keeps running) and refuses to allow the transmission to engage. If the unit is shut down and restarted it will move again until the next event. It appears that once the engine reaches normal operating temps, the problem goes away. By normal temp Iím not referring to the warm up period (grey area on gauge), but after the temp enters the green on the gauge, but before it reaches about half way into the green. My Driver counted 8 different events of the transmission shutting down in less than 2 miles.

The dealer has been on the phone to the engineers and they are only coming up with a Communications error between the drive controller and the console controller. They believe it is a wiring problem but when testing the wires indicated by the engineers, the meter says the wires are good. It has been suggested that I replace the drive controller which I suspect is $1,000.00 but no one can tell me that this will solve the problem. Any experiences, suggestions, would be greatly appreciated as I have a large storm comming!

Tim

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post #2 of 24 Old 01-03-2008, 12:21 PM Thread Starter
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Follow up:

This particular TC is an early 2005 B series. I spent quite a few hours last night trying to check and find (suggested by dealer) possible bad grounds. I also spoke with my Brother in Law who is in charge of trouble shooting and repairs at a large steel plant with lots of hydraulic equipment. He asked quite a few questions, one of which may be an indication that this is not a CPU issue. He asked if the boom/bucket still operated after the error code came up and the transmission would not engage. The answer is yes, which leads him to believe that this may be a sticking control valve. He suggested that if I could get the unit to fail again, try and run the boom to warm up the fluid as see if the transmission will engage again without shutting down and clearing the error code. I tried repeatedly this morning to get the error code to come up with no luck. One thing I do know for sure. If you allow the unit to reach normal operating temp, it will run without any issue. Iím hoping and praying that this will continue as the National Weather Service has issued a Blizzard Warning for our area.

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post #3 of 24 Old 01-03-2008, 04:37 PM
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Good luck timm, hope you get through the storm without any problems.

Let us know what (if) the problem is when you find it.




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post #4 of 24 Old 01-03-2008, 06:34 PM Thread Starter
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Mark,

Thanks for the kind words!

I'm about desperate enought to just pay the $1,300 (plus Tax & shipping) for the drive & console CPU's and hope and pray that solves the problem. If that does not resolve the issue I guess I could just keep them as reserve parts...?

After posting earlier today the driver of that unit picked it up, completely warmed it up, and "it" promptly failed about 3 miles from the shop. I guess our previous deductions didn't hold much water....

I'm thinking that if I can get through the next series of storms, I'll pull the CPU's out of another unit and swap them and see if the problem follows the CPU's. If it does not, then I know it not the CPU's.

Tim

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post #5 of 24 Old 01-04-2008, 05:48 AM
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*disclaimer* I know nothing about toolcats. The only thing I know about bobcats comes from the 8 hours I spent in one last week.*

But, trying to follow a logical process for troubleshooting... if you suspect that it's a hydraulic problem, and operating temperature seems to impact the occurrence of this problem, maybe it's the temperature of the hydraulic fluid that's causing the problem. I know you were exploring this option, but it seems to be a logical road to follow, especially if the computer swap doesn't pan out.

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post #6 of 24 Old 01-08-2008, 05:52 PM
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Tim,

I was feeling real nervious about your recurring drive problems on your TC with that BIG storm(s) heading your way.

How did things turn out?

Rip

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post #7 of 24 Old 01-09-2008, 11:43 AM Thread Starter
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Rip,

Thanks for the concern! We have made it through the last series of storms with a few "occurances" of the drive system shutting down.

Still working with the dealer to find a solution. In two more days we are supposed to get a break in the weather and I going to try the CPU swap and see what happens. While I'm extremely far from knowledgable about the inner workings of the TC, I still think this is something other than a CPU issue. I think it's going to be a "ghost" in one of the sensors that is giving a false code to the CPU.

Sooner or later we will find the answer and when we do I will be sure to share!

Thanks again!

TimM9
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post #8 of 24 Old 01-09-2008, 02:52 PM
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Glad it did not shut you down just when you needed everything working 110%for all that Sierra Cement!

Does sound like a possible bad or intermittant sensor signal.....look forward to hearing what it turns out to be.

Good Luck, Rip

Bailey CO:
'98 Chevy K2500
Western 7.5' PolyPlow w/rubber edge
PowerTrac 1845 Articulated Tractor
QA-2000 73" Blower
PT Blade & Snow Bucket
BC Canada:
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post #9 of 24 Old 01-17-2008, 02:52 PM Thread Starter
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I thought I would post (what I'm hoping is) a final update to the 50-56 error code. During the last series of storms the intermittent problem with the TC refusing to allow the transmission to engage was increasing in frequency. At one point the Driver of that unit radioed that it had quit on him 5 times in one driveway. It was no longer functioning properly even at operating temps, which had proven to temporarily solve the issue in previous storms.

Out of desperation I finally loaded the unit on a trailer and hauled it the two hours to the dealer. I arrived just before closing and the TC would not allow me to move it off the trailer. It took approximately 20 attempts (shutting off and restarting) to even back the TC off the trailer. I felt bad because the employees were waiting to go home and had to wait for me.

In the morning the Service Manager drove the TC around and could not get it to fail again! Finally, on the following day the Service Manager called and said he got it to fail and that the first thing they found when the laptop was hooked up was the diagnostics could not find the CPU! It appears that the problem intermittently resides in the Console CPU. The Service Manager ordered a new Console CPU and was told that they are on back order. Somehow, he found one and with overnight shipping, it arrived today! They are installing the new CPU and reprogramming it. They want to keep the TC an additional day to see if that is the only problem. I'm keeping my fingers crossed! Another storm due in on Sunday night! If there are any additional issues I will post them. Thank you to everyone that responded! I have tried to post all of the symptoms. I'm hoping that by posting all this it will save someone else all the time and frustration.

TimM9
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post #10 of 24 Old 01-17-2008, 02:54 PM
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Tim,

Other than the code # it is throwing , it sure sounds like the speed sensor is throwing the CPU for a loop.
Can you realte the problem having anything to do with the front wheels either coming off the ground or having alot of the pressure taken off of them from downpressure on the boom? Not sure if you are running a blade , pusher box or just a bucket on the front of the TC.

Scott

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post #11 of 24 Old 01-17-2008, 03:14 PM Thread Starter
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Scott,

There does not seem to be any connection to which attachment is on the TC. The failures have occured with the following attached; blower, bucket, and no attachment. When we played h*ll getting it off the trailer at the dealer, there was nothing attached. In addition, most of the failures occured when it was "roading" between job/contract sites.

I sure hope (and pray) this was the only issue....

TimM9
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2004 2500HD Boss 8-2V
2001 2500HD Boss 8-2V
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post #12 of 24 Old 01-17-2008, 04:21 PM
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Tim,

Sure will keep fingers crossed that the new CPU really fixes the problem although it is certainly an expensive fix (out of warantee I assume?) compared to a sensor or connector.

Hope to hear a Thumbs Up in a week or two that all is well !!

Good Luck !

Bailey CO:
'98 Chevy K2500
Western 7.5' PolyPlow w/rubber edge
PowerTrac 1845 Articulated Tractor
QA-2000 73" Blower
PT Blade & Snow Bucket
BC Canada:
Toolcat 5600-C Hi-Flo
QA-2000 73" Blower
Western 8 ft Pro w/wings
Thomas Self-Loading Sander
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post #13 of 24 Old 01-22-2008, 04:45 PM Thread Starter
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Hi All,

I think this will be my final "update" on the Error Code 50-56.

The console CPU was replaced and the unit was picked up last Friday. It's been snowing since Sunday night and more predicted non-stop into the weekend. This TC has been running thru the storms and has not had anymore issues!

Thanks again for all the responses, suggestions, and well wishes!

TimM9
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2004 2500HD Boss 8-2V
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post #14 of 24 Old 06-18-2008, 01:40 PM Thread Starter
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Dreaded Error Code 50-56 Back Again!

Iím assuming the correct thing to do is resurrect this thread as opposed to starting a new one. If this is incorrect please accept my apology and move it where ever you feel is appropriate.

As you can see from the previous post(s), I had an issue with the Bobcat Error Code 50-56. After the new console CPU was installed all was good until February when we had 15 days of straight snow totaling 6 Ĺ feet, and the Toolcat started to lock up again with the 50-56 error code.

The dealer found that they could not find an available console CPU in the country! The dealer actually cannibalized another unit in their yard to get me back up and running. The temporary CPU worked for about 3 or 4 days and then it too was locking up with the 50-56 error code.

The dealer was able to find a new console CPU and came to me to install it. Everything was fine for approximately 60 to 70 hours which finished off the season. About a month ago, I started collecting my equipment from the driverís residences and bringing them back to the barn. The Toolcat sat unused until Monday night when I used it (or more accurately tried to use it) to move a trailer. It had only run about 10 minutes and locked up again with the error code 50-56. To make matters worse, it locked up sideways at my home blocking both garage doors and our daily drivers.

Out of desperation I pulled the driverís seat, center console, etc. and disconnected the wiring harness to the drive CPU controller and popped the dash console and disconnected the corresponding wiring harness. I reconnected both harnesses again and was able to move it out of the way. While the disconnect/reconnect does not solve the problem, it does allow some sort of reset so you can move the unit. Thank God itís summer!

The dealer is working on the issue but I wanted to post the most recent chain of events. Hopefully we will get to the bottom of this once and for all this time. I will post what ultimately happens! I still love my Toolcat(s), and I really love my dealer!

TimM9
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post #15 of 24 Old 06-18-2008, 07:25 PM
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I think it's lemon law time, and time for you to get a new toolcat... I'd be so pissed I'd have driven off a cliff or taken the admiral's lead and drowned it. There's no place in any professional's stable for a piece of equipment that fails repeatedly and for the same reason each time. When time is money, this machine is costing you alot of both...
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post #16 of 24 Old 06-19-2008, 02:04 AM
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Something is causing the CPU to lock up i would think after three units this would be a no brainer your abilty to reset even though temp just reinforces that.

Fred Pickering
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post #17 of 24 Old 06-19-2008, 08:58 AM Thread Starter
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I fired it up again last night to move it to a different location and no issues. The last time I disconnected (last fall) and reconnected the two harnesses it didn't lock up again for quite a few hours. On the bright side, it's summer and I don't have to stress like I did in the middle of a 15 day long storm!

TimM9
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post #18 of 24 Old 06-23-2008, 03:53 AM
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I'm thinking a short in the wiring harness.

Had a truck that had the coil wire wear through on the air filter cover years ago. Truck would die while plowing, we'd push\pull the truck to the shop, remove the air cleaner cover, mess with the coil wire and plug wires, truck would fire up until the next time. Finally dug deeper and found the bare wire.

Are they testing the CPU's that have been replaced to see if they are bad?




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post #19 of 24 Old 06-23-2008, 07:25 AM Thread Starter
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Mark,

I think you are on the right track. I had the same conversation with the service manager. How can I have gone through 3 console CPU's in 6 months? They can't all be bad. As I mentioned to the dealer, there has to be something else that is causing the error code and the computer does not know how to report it. I'm not going to make any "final reports" until I know that it's really fixed this time.

TimM9
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post #20 of 24 Old 07-05-2019, 07:01 AM
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Error Code 50-56

Hello, timm9,
Did you ever find the solution to Error Code 50-56? I am getting it on my 5610. Fuse 4 is blowing. Same symptoms as you experienced.
Thank you,
at5610
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post #21 of 24 Old 07-05-2019, 09:10 AM Thread Starter
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at5610,

I'm a little stunned that I never came back and posted the resolution which drives me nuts when I'm desperately looking for a fix. Please forgive me...

The issue was resolved with the discovery of a loose connector at the dash controller.

After re-securing the connection I have had zero issues.

Hope this helps!

Tim

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post #22 of 24 Old 07-09-2019, 03:28 PM
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Error Code 50-56

That's great. Gives me a little hope. I had a new harness installed less than a year ago and I bet there are just some loose connections. Appreciate the response.
at5610
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post #23 of 24 Old 07-28-2019, 08:39 PM
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Error Code 50-56

Well, after 2 weeks at Bobcat, they thought they had solved the Error 50-56 code by replacing the wiring harness that goes from the dash to the 7-pin connector on the loader arm. They claimed there was a rub on the harness at some point. I have no reason to doubt them but I haven't seen the evidence, yet. Anyway, got it back to the ranch and was raking hay at about 8 mph when all of a sudden it came to a sudden stop. The weather was hot, I had the A/C on and it's dusty so the machine was working hard and hot but not overheating by any stretch. I let it rest for a few minutes, cleared off the dust from the rear radiator cover while I was waiting and replaced Fuse 4. Tried to restart it and it immediately blew Fuse 4 again and gave Error Code 50-56. So, we switched the rake to another machine and let the machine sit there for the rest of the weekend. I was getting ready to winch the unit onto a trailer the next day and I decided to try another 20 amp fuse in Fuse 4. I started it up and it loaded without issue. At least it saved me the time and effort from loading a dead machine. Anyway, it's heading back to Bobcat tomorrow for them to continue troubleshooting.

I don't recall whether the machine was hot the first time I encountered this issue but, at least this time, it didn't blow Fuse 4 when the machine was cold. When I say cold, I mean Texas cold. It was 90 degrees outside when we were loading it and it hadn't been run in 24 hours.

A little history on the unit, during some extended off season time, a rat got into the machine and chewed the main wiring harness literally in half. I had the entire wiring harness replaced with a new one at significant cost. Worked fine for about 100 hours. Then 50-56 started showing up and it blows Fuse 4.

I was very skeptical and have told them about the posts about the faulty wiring harnesses that others have experienced but they seemed determined to do it their way.

I'd be very interested if anyone else experienced a similar failure.
Thanks.

AT5610
Coldspring, TX
Bobcat T-300 CTL
Bobcat 5610 Toolcat
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post #24 of 24 Old 08-20-2019, 01:48 PM
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Error Code 50-56

OK, it's August now and we finally solved the Error Code 50-56. The dealership initially thought it was a rub through of the harness that goes from the drive controller to the 7-pin connector. Unfortunately, it was not. After another 2 weeks in the shop they finally found the drive controller gel pack was cracked and had allowed dust and moisture into the drive controller. It's a pretty beefy computer panel that has about a 1" think gel poured into it. After several years, it must get brittle and probably couldn't handle the heat in Texas. Anyway, $400 later, we're up and running again. The dealership was fair and didn't charge me any labor to install it since they charged me full price for the harness replacement. I'll post again if it reoccurs.

AT5610
Coldspring, TX
Bobcat T-300 CTL
Bobcat 5610 Toolcat
Bobcat 3400XL UTV
Bobcat 3400 UTV
Bobcat E85 Excavator
John Deere 6415 Tractor
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