Construction and Road Equipment

Construction and road equipment repair questions? Ask a mechanic ASAP

Connect one-on-one with {0} who will answer your question

This answer was rated:

2000 bobcat 773 will not move. Parking brake locked. Appears…

2000 bobcat 773 will not...
2000 bobcat 773 will not move. Parking brake locked. Appears no power is going to brake solenoid. Both circuits, pull and hold, check good. Fuse, relay, foot switch, and seat lock all good. All lights except park brake come on when "push to operate" is engaged. Pushing traction lock bypass has no effect. Codes read "none". All visible wiring appears good. Appears to electrical problem. Are there other solenoids/switches that I have overlooked. What wiring should I check for conductivity. I have a wiring diagram and have checked about everything associated with the brake. Thanks, Tommy
Show More
Show Less
Ask Your Own Construction and Road Equipment Question
Answered in 37 minutes by:
6/24/2015
Mechanic: Fieldtech59, Shop manager replied 7 years ago
Fieldtech59
Fieldtech59, Shop manager
Category: Construction and Road Equipment
Satisfied Customers: 201
Experience: Construction equipment repair technician since 1986, JLG certified, Shop manager since 2006.
Verified
Hello, is this a 773 G series with triangle shaped headlights?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 years ago
yes
Mechanic: Fieldtech59, Shop manager replied 7 years ago
Ok, thanks. I had to make sure because 2000 is just about the time they stopped making the F series and started the G series and they're totally different. The problem you're having is curious, all other BICS lights come on except traction lock, and it is locked, but you can work bucket lift and tilt. That indicates the fault is not with the seat bar sensor. Two possibilities is either a fault with the left panel (where the BICS controller is) or a fault with the main controller (ECU). Again, I say possibilities, I don't recommend going out and replacing either without some kind confirmation that either are the cause of the failure. The problem is there's no way for you to test either, the only way to do that is have Bobcat plug their laptop into the comm port and run the diagnostics. The things is, if there is a fault with the electrical system, harness, or components for the parking brake solenoid the ECU should see this and give you three beeps from the alarm and a fault code(s). That ECU can see pretty much any problem with the circuit or components. If you cut a wire, you'll get a code. Disconnect the P brake solenoid, you'll get a code. Fault with the relay, code. The fact you're not getting codes is what's curious.One question, do you (or anyone) frequently use the parking brake rocker switch on the center console? If so, maybe it's went south and developed an internal fault. Wouldn't be hard to check, simply remove those two allen head screws that hold the center panel in place, pull the panel out and unplug the connector on the back of the parking brake switch, that will eliminate the switch from the traction lock circuit.BTW, is this a standard control machine, foot pedals only for lift/tilt functions and sticks for drive functions? Or is it a Selectable Joystick Control (SJC) machine?
Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 years ago
I checked the ECU by unplugging different circuits and the controller always gave me a code so I assumed it was functioning. My guess was the BICS was malfunctioning also. This unit has SJC. I may have overlooked it but I don't recall any center console, only a left and right, I will recheck asap. I was wondering if the parking brake has a relationship to the hand controls other than the parking brake switch (checks good) which appears to be on a circuit connected to both (L & R) hand controls. It appears both have been replaced but the machine has been functioning and all wires had resistance (the best I could check) . I will contact you as soon as I can about the rocker switch. Thanks for the help, Tommy
Mechanic: Fieldtech59, Shop manager replied 7 years ago
I'm not real sure about the SJC machines, haven't had much experience with them to know, but I wager if the left and right controls are not calibrated properly (after replacement of either control(s) or actuator(s)) then you will get some funky things happening and may even affect parking brake. I know on standard control machines the engine has to be running to send a signal from the RPM sensor before parking brake will release, and on AHC and SJC machines they also get input from the drive motor speed sensors. But even with those things, I still can't imagine they would be the problem as a fault with them should bring up a fault code. That's the part that has me stumped, you have no fault codes. That's what made me consider the parking brake switch, if it were either tripped or messed up inside causing a closed circuit, the ECU wouldn't see a problem, it would just think you've engaged the parking brake via the switch.
Aside from the parking brake switch, my best guess is the BICS controller inside the left panel isn't sending an input to the ECU to release the parking brake. I've never see a BICS controller do this before so I don't know how the ECU would react, if it were even able to see no input to release the brake from the BICS controller or even to put up a code. Typically, when there's a communication problem between the BICS controller and the ECU you see INPUT in the hour meter display, but this is typically a total no communication issue, not a no communication from just one function of the BICS controller, in this case the parking brake.
At this point I'm just stumped. If you don't find a problem with the parking brake switch or circuit, I'm afraid you may have to get some more advanced diagnostics from Bobcat. But I'm still going to be thinking about this and see if somethings pops in my head.
Ask Your Own Construction and Road Equipment Question
Mechanic: Fieldtech59, Shop manager replied 7 years ago
BTW, just so you know how the parking brake works on your machine, the solenoid itself has three wires, red black and white. The red wire goes to the low magnetic power hold coil inside the solenoid, the white wire goes to the high magnetic power pull coil in the solenoid, and the black wire is ground for the two coils. The hold coil doesn't have enough power to pull the solenoid spool in, that's where the pull coil has to be powered up to help pull the spool, but that coil can only be powered up for a few seconds or it will burn up the solenoid. Once the spool is pulled in the hold coil takes over to hold the spool in.
When you push the enable button on the BICS controller it (well, is supposed to) send a signal to the ECU (main controller) to release the parking brake by powering up the solenoid. The ECU then does two things, 1) is sends a direct voltage signal to the red wire (hold) on the solenoid, and 2) it sends a voltage signal to the parking brake relay in the fuse box. This trips the relay to send battery voltage to the white wire (pull) on the solenoid, after a few seconds (long enough to pull the solenoid spool) the ECU takes power away from the parking brake relay which kills the power on the white wire. By this time the spool is pulled and the red wire holds the solenoid spool in. When you have the parking brake released via the BICS controller and you flip the parking brake switch on the center cab panel, the switch sends a voltage input to the ECU to tell it to "turn off the power to the parking brake" thereby releasing the spool and engaging the brake. It doesn't "take away" the input from the BICS controller, that way when you again flip the parking brake switch again to release the brake you don't have to push the enable button again because the BICS input is still active and remains until you raise the seat bar.
As for the parking brake override button, that function only works when the seat bar is up. This is typically used when you have something like a backhoe attachment on the front of the machine. With the seat bar up the lift/tilt won't work, which is a good thing since the backhoe is attached to the coupler, but in this case you can press the traction lock override and drive the machine from the backhoe seat, but the seat bar has to be up for this to work.
Fieldtech59
Fieldtech59, Shop manager
Category: Construction and Road Equipment
Satisfied Customers: 201
Experience: Construction equipment repair technician since 1986, JLG certified, Shop manager since 2006.
Verified
Fieldtech59 and 87 other Construction and Road Equipment Specialists are ready to help you
Ask your own question now
Customer reply replied 7 years ago
I have tried the override with the bar up with no success. This machine does not have any switches on the center upper console. Is the parking brake switch, center of floor board, the only one or am I overlooking one. I have checked and double checked everything we have communicated about just in case but found nothing. If there is a switch that I may have missed please let me know. Thanks for all the help, Tom Bright
Mechanic: Fieldtech59, Shop manager replied 7 years ago
Does your machine have that orange colored metal parking brake pedal in the center floor board, in between the two foot pedals? That type of parking brake switch was used on the earlier C and F series machine and it spilled over into the very early G series machines (which yours would be), the later model G series machine used a rocker switch on the center cab panel in between the left and right control panels.
If you have that floor board parking brake you definitely want to check that out as a likely cause of your problem. That pedal depresses a push button switch to activate the parking brake.
And thank you very much for the positive rating. I try my best to earn a positive rating from a customer by doing all I can to help them with their problem. I'm hoping we find what's causing your machine to be unhappy.
Ask Your Own Construction and Road Equipment Question
Customer reply replied 7 years ago
I have tested the foot operated switch which tested good. There is no power to this point so I am assuming the problem must be either in the BICS or between it and the foot switch. I just hate for something to whip me but I believe Bobcat will need to hook the machine up to help me further. I just don't understand why I don't get any codes on the problem. I disconnect anything at any point and receive a code. Thanks for all the information and thoughts about this machine and the problem. Please contact me if you think of anything else. I know I can bypass everything and jump to the brake solenoid with a momentary rocker switch and a hold switch but persons other than myself use this machine and I am afraid it would just cause more problems down the road. I will contact you with the problem and fix so maybe if you experience this again you will have another diagnosis. Oh, by the way, my son had a self proclaimed master who said he could diagnose and repair any problem come by and after a couple of hours left for lunch and he has not been heard from since. Sometimes it's best to not brag until you meet the foe. Thanks again, Tom
Mechanic: Fieldtech59, Shop manager replied 7 years ago
Agreed, at this point I think it's time to get Bobcat to plug the laptop into the machine to help crack the little nut. Best of luck Tom, I hope you get it sorted out in short order. Paul
Ask Your Own Construction and Road Equipment Question
Was this answer helpful?

How JustAnswer works

step-image
Describe your issueThe assistant will guide you
step-image
Chat 1:1 with a mechanicLicensed Experts are available 24/7
step-image
100% satisfaction guaranteeGet all the answers you need
Ask Fieldtech59 Your Own Question
Fieldtech59
Fieldtech59
Fieldtech59, Shop manager
Category: Construction and Road Equipment
Satisfied Customers: 201
201 Satisfied Customers
Experience: Construction equipment repair technician since 1986, JLG certified, Shop manager since 2006.

Fieldtech59 is online now

Related Construction and Road Equipment Questions
I have a Bobcat 763 which is an old machine... mid 90's.. my
hello, i have a Bobcat 763 which is an old machine... mid 90's.. my traction lock will not click (disengage) when i hit the button. The bucket and arms still function but the brake lock will not disen… read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have a bobcat t300 vin 532013172. My problem is with
i have a bobcat t300 vin###-##-#### My problem is with traction lock control ...fuses are good swapped relays out still doesnt unlock ..if i send power to solenoid with a power probe3 it clicks and li… read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have bobcat 753 F that i bought. brake was held upwith
I have bobcat 753 F that i bought. brake was held upwith vice grips. I want a parking brake. I replaced the solenoid and the parking brake will not release.... BIC flashes 4 times. THe seat switch is … read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have a 773 G series. I keep blowing the traction fuse and
I have a 773 G series. I keep blowing the traction fuse and the machine acts like the parking brake is on. Is there a way I can isolate the problem by disconnecting harnesses? I disconnected the harne… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
Bobcat 773 (500K11347). the foot pedals locked up and I
Bobcat 773 (500K11347). the foot pedals locked up and I can't use the lift or tilt functions. The lights on the "Press to operate" button don't turn on. Even though the engine starts fine it wouldn't … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
I have a 99 753 bobcat that won't release the traction
I have a 99 753 bobcat that won't release the traction interlock? All functions work except moving forward or backward. The diagnostic light panel all light up, I have replaced the the foot brake swit… read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
My bobcat 773 I was running it with a grapple on it and the
My bobcat 773 I was running it with a grapple on it and the arms would go up when I tried to go down and the bucket would curl all the way forward and not come back … read more
JimmyM827
JimmyM827
Bobcat specialist
Automotive technologies
70 satisfied customers
I have a bobcat 763 series F. The traction lock was not
I have a bobcat 763 series F. The traction lock was not releasing. I changed the override switch and the solenoid for the traction lock. The bobcat starts. The solenoid will release the traction lock … read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have a 2004 Bobcat 773. It will not move or the bucket
I have a 2004 Bobcat 773. It will not move or the bucket will not raise. it will title. … read more
Curtis B.
Curtis B.
Technician
Associate Degree
2,324 satisfied customers
I have a 773 Bobcat that won't move. The bucket and boom
I have a 773 Bobcat that won't move. The bucket and boom both work as they should. Parking brake light flashes six times and then pauses. This repeats itself. The parking brake lever between the foot … read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have replaced the traction lock solenoid but it is still
I have replaced the traction lock solenoid but it is still locked in gear. Everything I read looks like it should be a ground wire problem. Where would I go from here? … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
Our bobcat 751 will not go forward or backward. We put a new
Our bobcat 751 will not go forward or backward. We put a new seleniod in it and check all fuses. New emergency brake also. … read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
Seat safety switch on a bobcat. 773. I an trying to, their
i an trying to, their is 3 wires going to it. i can set in the seat and all of the green lights lite up for a second and the seat light goes out, … read more
Fieldtech59
Fieldtech59
Shop manager
201 satisfied customers
I have a bobcat 773 that I am having an issue with. Bobcat
I have a bobcat 773 that I am having an issue with. … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
Can I get an specialist in bobcat s175? thn, bobcat S175
yes, I have troubleshoot the traction lock solenoid that does not work because is not getting power from the controller … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
My bobcat S130 has an error code of M1507, how do I fix it,
My bobcat S130 has an error code of M1507, how do I fix it … read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
I have a 753G Bobcat skid steer I was plowing snow and everything
I have a 753G Bobcat skid steer I was plowing snow and everything was good I shut the machine off restarted it and now the lift/tilt doesn't work and the lift/tilt valve light on the console is flashi… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
on a 773 bobcat, is the safety valve on the drivetrain set
on a 773 bobcat, is the safety valve on the drivetrain set mechanically or electronically? How do you get it opened when all the safety switch indicator lights are green, yet it still won't move?… read more
Daniel Wilson
Daniel Wilson
Auto Mechanics 1&2/diesel mech
1,198 satisfied customers
Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

JustAnswer in the News:

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help.

Mary C.Freshfield, Liverpool, UK

This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!!

AlexLos Angeles, CA

Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult.

GPHesperia, CA

I couldn't be more satisfied! This is the site I will always come to when I need a second opinion.

JustinKernersville, NC

Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around.

EstherWoodstock, NY

Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know.

RobinElkton, Maryland

He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here.

DianeDallas, TX

< Previous | Next >

Meet the Experts:

Curtis B.

Curtis B.

Technician

2,324 satisfied customers

Technican turned service manager with multiple lines of equipment and rental units.

Wayne

Wayne

Journeyman

1,298 satisfied customers

worked on many road graders, Bull dozers , skid steers, Rollers

Cat Man

Cat Man

Cat Engine Expert

578 satisfied customers

I am ASE Master Certified.

dieseldan55

dieseldan55

Mechanic

299 satisfied customers

Road Mechanic for Volvo Construction Equipment.

Chris (aka- Moose)

Chris (aka- Moose)

Technician

85 satisfied customers

24 years of experience diagnosing & repairing

Steve

Steve

Mechanic

42 satisfied customers

Heavy Equipment Mechanic for 25 years

JBFixxer

JBFixxer

Mechanic

22 satisfied customers

16+ years experience, hydraulics,hydrostatics, engines, fuel injection systems. And everything in between.

< Previous | Next >

Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

Show MoreShow Less

Ask Your Question

x