Hey, I'd like to get mine repaired
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Cat 226b thumb wheel switch replacement
- Thread starter Shan Singh
- Start date
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- Tags
- 226b cat skid steer
Nige
Senior Member
Depends which type of thumbwheel you have. What model of machine did it come from.?
stefuel
Well-Known Member
Somewhere in this huge thread I seem to recall a physically identical switch but it was designed for a 5V reference voltage. What do you think might happen if you simply put a resistor between Cat's 8V reference line into that switch, dropping that voltage to 5V?
matthewbelson
New Member
What magnets did you use to replace the switch magnet?
I have tried a magnet that is magnetised north to south on the flat surfaces. It works but only turns my attachment in one direction until I flip the magnet. Then only in the other direction.
Any suggestions?
Cheers
matthewbelson
New Member
What magnets did you use to replace the switch magnet?
I have tried a magnet that is magnetised north to south on the flat surfaces. It works but only turns my attachment in one direction until I flip the magnet. Then only in the
Any suggestions?
Cheers
Jwhalen123
Member
Hey all, my aux hydraulics aren’t working on my new to me 247B2. Am I correct in understanding that as long as the aux hydraulic lines are hooked up, they should function when the thumb switch is rolled forward or backward right off the bat without having to press any other button sequence first?
Nige
Senior Member
That is correct.
If the AUX hydraulics are not activating the first thing to check is the power supply to and voltage output from the thumbwheel roller switch. Somewhere in this thread will be a schematic illustrating the connections.
Can't see a 247B2, only a B3 model. What's your machine Serial Number.?
Jwhalen123
Member
Okay, thank you. My serial is MTL06131. When back probing the connector to test voltage, would regular multi meter probes do the trick or do I need special probes to test each wire? Also, is the magnet in the switch this round piece inside? I already took it apart to check. It was easier than getting the stubborn romps bolt nuts off.
Attachments
Nige
Senior Member
It is, and it looks fine to me.
Provided the probes are smaall enough to get in from the back side of the connector along the wire they will be fine. I've seen it done using a couple of paper clips pushed into the back of the connector. The tests need to be done without unplugging the connector.
Measure between 1 & 2 with the key ON. The engine does not have to be started.
Then measure between Pins 2 & 3 with the thumbwheel in the centre, rolled fully forward, and rolled fully back. Come back with your results.
Jwhalen123
Member
A
Hey Nige! Across - 1 and 2 I’m seeing 8v. Across 2 and 3 I’m seeing -7.5v regardless of what position the thumb switch is in. I tried this with just the key on and also with the key on, interlock bar down, and parking brake off. Same results.
Nige
Senior Member
That means the thumbwheel roller switch is farked, despite the magnet looking to be in reasonable condition. Between Pins 2 & 3 the output should be about 4.5v in the centre then increase/decrease by about 2.5v when you roll it fully one way or fully the other way.
The only solution is a replacement joystick handle. The switch is not sold separately.
Jwhalen123
Member
Roger. Luckily, I found a used one ebay that should be arriving today/tomorrow. The guy confirmed the thumb switch was working before removal so hopefully I didn’t get scammed.
Nige
Senior Member
I hope for your sake it does work because used handles seem to be like hen's teeth.
Jwhalen123
Member
Tested the used joystick and it worked! The rubber coating on it is failing pretty bad, instant black sticky hands, so I removed the guts and replaced the ones in my joystick with them. Everything is back together and working fine!
To help others, I kept my magnet since it was in good condition. If someone wants to try and replace theirs, happy to ship it to you. Just cover shipping. I’m assuming the hall sensor went on mine instead of a deteriorating magnet.
Jeffcarvalho79
Member
Hi do you still have the magnet? I will be taking mine apart tomorrow and I’m thinking that will be my problem. Thank you
Jwhalen123
Member
I do. Shoot me your address and I can drop it in the mail.
Jeffcarvalho79
Member
Jeff Carvalho 14136 Hexam road Brooksville FL 34613
I can send you some $ through cash app or PayPal whatever is easier for you. Thank you
Jeffcarvalho79
Member
I did end up taking it apart and the magnet was crumbed in to pieces. So I’m pretty confident now the magnet will fix it. Thanks again
Jwhalen123
Member
Hey man, totally had slipped my mind shipping it. But definitely will, sorry for the delay. I know it sucks having a machine sitting.
Jeffcarvalho79
Member
Yes thank you I could really use it, I appreciate it.