seat-bar sensor malfunction

[Axel]

could scraping rust close to the seat bar sensor cause it to malfunction?

 

[OldMachinist]

Yes, The sensor is a magnetic switch. You'll need to clean it.

 

[Axel]

Yes, The sensor is a magnetic switch. You'll need to clean it.

when removing the seat bar to get to the sensor, is there anything I should be aware of? for example will the springs be difficult to reinstall?

 

[OldMachinist]

when removing the seat bar to get to the sensor, is there anything I should be aware of? for example will the springs be difficult to reinstall?

You don't have to remove the seat bar to take the sensor out.

http://i245.photobucket.com/albums/gg49/calfranch/Bobcat/863/SeatBarSensor_zpse53b50ab.jpg

 

[Flip57]

when removing the seat bar to get to the sensor, is there anything I should be aware of? for example will the springs be difficult to reinstall?

There is an allignment pin on the magnet that is easily twisted off when removing the bolt to the seat. I had the Dealer in Flagstaff replace my seat but they twisted off the pin. They then aligned the magnet just enough to get it out the door. My machine ran for about 10 minutes befor the magnet became out of alignment. I took a pan head machind screw and ground it down to fit the spot the pin should have been. It's stll there and working fine.

 

[Flip57]

There is an allignment pin on the magnet that is easily twisted off when removing the bolt to the seat. I had the Dealer in Flagstaff replace my seat but they twisted off the pin. They then aligned the magnet just enough to get it out the door. My machine ran for about 10 minutes befor the magnet became out of alignment. I took a pan head machind screw and ground it down to fit the spot the pin should have been. It's stll there and working fine.

I realize that this was about the safety bar but you might want to check the seat sensor as well.

 

[Axel]

There is an allignment pin on the magnet that is easily twisted off when removing the bolt to the seat. I had the Dealer in Flagstaff replace my seat but they twisted off the pin. They then aligned the magnet just enough to get it out the door. My machine ran for about 10 minutes befor the magnet became out of alignment. I took a pan head machind screw and ground it down to fit the spot the pin should have been. It's stll there and working fine.

two weeks ago When I tried loosening bolt (item 3)[D] , the bolt on the other side(item 1)[D] was also spinning and there was no room for a wrench to grab it. it seems to be a matter of about 1/8" too little clearance for the width of a combination wrench to fit.

 

[antfarmer2]

two weeks ago When I tried loosening bolt (item 3)[D] , the bolt on the other side(item 1)[D] was also spinning and there was no room for a wrench to grab it. it seems to be a matter of about 1/8" too little clearance for the width of a combination wrench to fit.

Is there room to tack weld the nut or JB weld it

 

[antfarmer2]

Is there room to tack weld the nut or JB weld it

Or just grind down a cheap wrench

 

[Axel]

Or just grind down a cheap wrench

Yesterday I ground down my cheapest 9/16 wrench and got the left side of the seat bar detached to remove the sensor. However, the pin for the spring would not move, seems to have a groove worn that's created a ridge preventing any movement(probably would have to hit it very hard or cut to remove) But I managed to clean the magnet in place. The magnet looked a little dusty so I brushed it off while holding another magnet next to it to catch the debris. just put it back together and got the bobcat warmed up. The only things that would light up on the BICS besides the power light was the traction. and it wouldn't turn off when I raised the seat bar(even multiple times). I hear a click which I'm guessing is the traction solenoid? it's sometimes louder and sometimes quieter when I press the traction button after lowering the seat bar.

 

[Axel]

There is an allignment pin on the magnet that is easily twisted off when removing the bolt to the seat. I had the Dealer in Flagstaff replace my seat but they twisted off the pin. They then aligned the magnet just enough to get it out the door. My machine ran for about 10 minutes befor the magnet became out of alignment. I took a pan head machind screw and ground it down to fit the spot the pin should have been. It's stll there and working fine.

What was the symptom of the misalignment? When you say "seat" do you mean "seat bar"? The magnet part of the sensor has about 20° of free rotation around the bolt, how can I ensure that it's aligned when reinstalling the sensor?

 

[Axel]

What was the symptom of the misalignment? When you say "seat" do you mean "seat bar"? The magnet part of the sensor has about 20° of free rotation around the bolt, how can I ensure that it's aligned when reinstalling the sensor?

In my previous post I was referring to the post made by Flip57 Posted: 01-05-2015 11:22 AM.

 

[Axel]

In my previous post I was referring to the post made by Flip57 Posted: 01-05-2015 11:22 AM.

So I've now realized that the alignment pin is missing. I'm trying to understand how it's supposed to work so I can make a new one... I would think it should be removed once the magnet and sensor are aligned and installed but then where should it be kept?..how do I adjust alignment if the magnet will not rotate? also having difficulty removing the magnet, the outer nut has some protrusions on it so that a socket will not slide over it, should they be ground down? it's really on there. When I rotate the bolt inside the magnet, the resistance varies as it goes full 360°, is this normal.

 

[Tazza]

So I've now realized that the alignment pin is missing. I'm trying to understand how it's supposed to work so I can make a new one... I would think it should be removed once the magnet and sensor are aligned and installed but then where should it be kept?..how do I adjust alignment if the magnet will not rotate? also having difficulty removing the magnet, the outer nut has some protrusions on it so that a socket will not slide over it, should they be ground down? it's really on there. When I rotate the bolt inside the magnet, the resistance varies as it goes full 360°, is this normal.

The part with the magent should have a pin or groove that acts as a locator. It will be fixed in place on the seat bar so as the seat bar moves, so does the magnet. The sender is fixed to the frame so it will not move and when the magnet rotates enough it will activate the sender.
The key is to get everything moving that should move and lock down everything that should not move. Over time you get rust that breaks things off, especially locking tabs for the magnet.
Does the light come on when you start the machine and with the sender and magnet in hand, rotate it slowly while watching the dash?

 

[Axel]

The part with the magent should have a pin or groove that acts as a locator. It will be fixed in place on the seat bar so as the seat bar moves, so does the magnet. The sender is fixed to the frame so it will not move and when the magnet rotates enough it will activate the sender.
The key is to get everything moving that should move and lock down everything that should not move. Over time you get rust that breaks things off, especially locking tabs for the magnet.
Does the light come on when you start the machine and with the sender and magnet in hand, rotate it slowly while watching the dash?

Tazza, you say that the magent should have a pin or groove that acts as a locator. yes it does have a groove, however the pin which is missing is supposed to be on the sensor according to the service manual. what I don't understand is why would the pin remain after the magnet and sensor are aligned? Also, where would the locking tabs for the magnet be? there seem to be some worn tabs at the end of the metal bushing inside the magnet, but where it mounts to the cab there is an oval hole unlike what the photo in the manual which has a round hole with two square tab sides. I have a hard time imagining that the tabs could have created such a clean oval hole in the cab..but maybe. still haven't managed to get the magnet off the bushing(not much space for tools between the cab and seat bar)... thanks for all of the responses everyone, i'm on a steep learning curve with this machine

 

[Tazza]

Tazza, you say that the magent should have a pin or groove that acts as a locator. yes it does have a groove, however the pin which is missing is supposed to be on the sensor according to the service manual. what I don't understand is why would the pin remain after the magnet and sensor are aligned? Also, where would the locking tabs for the magnet be? there seem to be some worn tabs at the end of the metal bushing inside the magnet, but where it mounts to the cab there is an oval hole unlike what the photo in the manual which has a round hole with two square tab sides. I have a hard time imagining that the tabs could have created such a clean oval hole in the cab..but maybe. still haven't managed to get the magnet off the bushing(not much space for tools between the cab and seat bar)... thanks for all of the responses everyone, i'm on a steep learning curve with this machine

Not sure the locator should be on the sensor too. The sensor should be stationary, but the magnet should move with the seat bar. Sadly i don't have one easily accessable to show you what i mean.
The magnet needs to rotate with the seat bar, i do remember that the locator was small and easily broken off as there should be very little to no load on the magnet.