I am posting this thread to try to get help from others, but also to help others who are searching for this same issue because I assume I will fix it and from all the reading I have done I will hopefully save others time by consolidating some information here.
Searching google and/or this site brings up a lot of hits about lift/tilt problems with Bobcats. However, none of the other post's descriptions of the BICS indicators show the same indicators as I am seeing.
I have a 2001 Bobcat 863F with BICS and Advanced Hand Controls (AHS). The bobcat has a key, a manual hour meter (no codes).
The problem is that the lift/tilt functions do not always operate. Usually turning off/on the bobcat allows the lift/tilt to work again. Most recently I can't get the lift/tilt functions to work at all. The bobcat can drive around no problem once I push the override button, but lift/tilt do not work (and don't even try to work indicating electrical problem, not hydraulic problem).
The BICS indicator is showing the seat light blinking (the seat sensor is disconnected because it didn't fit right with the new seat I put in). This has never been a problem as I have always pushed the yellow seat override button below the key (I think that's what that button is called but could possibly be called the Press to Operate / Traction Control Override button).
The Seat Bar indicator is on. In many other threads this switch is the culprit to lift/tilt problems but in my case the light is always on when the bar is down.
The Valve indicator is off. This is the indicator that the lift / tilt functions do not work, but the service manual does not indicate why the light might stay off. When there is a problem the light is supposed to blink 1, 2 or 3 times, but it does not turn on at all.
The Traction indicator is on.
The Power indicator is on.
The service manual has a section on diagnosing the joysticks by looking at the LED indicators on the left joystick, but the indicators do not turn on. The indicators not turning on indicate that the joysticks are not being supplied power from the BICS controller (at least that's what I deduce from the service manual).
I have tried moving the joysticks around and then turning on the machine in case they weren't centered, but that has not solved the problem.
My question is, does anyone have any idea what could cause the Control Valve indicator on the BICS controller to not turn on? I can't find anything in the service manual or online that explains the cause of the light not turning on at all. The only thing I have come across that seems plausible is that pin 1 on the BICS controller has a bad connection from the hydraulic lock solenoid:
From the poster named "special tool" in another post:
https://www.heavyequipmentforums.com/archive/index.php/t-222.html
Hydraulic lock solenoid supplies a ground only to bics at pin#1....(maybe
check chassis ground continuity here? oxidation????)
My next step will be to look at that wire, but I've read about a relay that apparently controls the control valve solenoid but I don't see anything on the wiring diagram.
Things I am not 100% sure of and may be throwing me off, ie. the problem may be the seat bar even though the BICS indicator is correct:
1. From my understanding, the bobcat should both not drive or lift/tilt if the park brake is set indicating that the park brake circuit is not the problem since the bobcat does drive.
2. The bobcat should both not drive or lift/tilt if the seat bar is not down or malfunctioning indicating that the seat bar switch is not the problem since the bobcat does drive.
Thank you,
Luke
Searching google and/or this site brings up a lot of hits about lift/tilt problems with Bobcats. However, none of the other post's descriptions of the BICS indicators show the same indicators as I am seeing.
I have a 2001 Bobcat 863F with BICS and Advanced Hand Controls (AHS). The bobcat has a key, a manual hour meter (no codes).
The problem is that the lift/tilt functions do not always operate. Usually turning off/on the bobcat allows the lift/tilt to work again. Most recently I can't get the lift/tilt functions to work at all. The bobcat can drive around no problem once I push the override button, but lift/tilt do not work (and don't even try to work indicating electrical problem, not hydraulic problem).
The BICS indicator is showing the seat light blinking (the seat sensor is disconnected because it didn't fit right with the new seat I put in). This has never been a problem as I have always pushed the yellow seat override button below the key (I think that's what that button is called but could possibly be called the Press to Operate / Traction Control Override button).
The Seat Bar indicator is on. In many other threads this switch is the culprit to lift/tilt problems but in my case the light is always on when the bar is down.
The Valve indicator is off. This is the indicator that the lift / tilt functions do not work, but the service manual does not indicate why the light might stay off. When there is a problem the light is supposed to blink 1, 2 or 3 times, but it does not turn on at all.
The Traction indicator is on.
The Power indicator is on.
The service manual has a section on diagnosing the joysticks by looking at the LED indicators on the left joystick, but the indicators do not turn on. The indicators not turning on indicate that the joysticks are not being supplied power from the BICS controller (at least that's what I deduce from the service manual).
I have tried moving the joysticks around and then turning on the machine in case they weren't centered, but that has not solved the problem.
My question is, does anyone have any idea what could cause the Control Valve indicator on the BICS controller to not turn on? I can't find anything in the service manual or online that explains the cause of the light not turning on at all. The only thing I have come across that seems plausible is that pin 1 on the BICS controller has a bad connection from the hydraulic lock solenoid:
From the poster named "special tool" in another post:
https://www.heavyequipmentforums.com/archive/index.php/t-222.html
Hydraulic lock solenoid supplies a ground only to bics at pin#1....(maybe
check chassis ground continuity here? oxidation????)
My next step will be to look at that wire, but I've read about a relay that apparently controls the control valve solenoid but I don't see anything on the wiring diagram.
Things I am not 100% sure of and may be throwing me off, ie. the problem may be the seat bar even though the BICS indicator is correct:
1. From my understanding, the bobcat should both not drive or lift/tilt if the park brake is set indicating that the park brake circuit is not the problem since the bobcat does drive.
2. The bobcat should both not drive or lift/tilt if the seat bar is not down or malfunctioning indicating that the seat bar switch is not the problem since the bobcat does drive.
Thank you,
Luke