Nige
Senior Member
For some reason it seems that your profile will not accept PMs. Try PM'ing me and you can have the schematic by return.
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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
quiksilvr
Well-Known Member
ok i fixed it
quiksilvr
Well-Known Member
ok well heres the latest update. i got the switch (htwm-1a11a22) from mouser.com. and its not working at all. i connected a dmm to the switch ground and output wires while it was connected to the skidsteer and engine running i have 8v and when i roll the switch to full travel in either direction, i see no change in voltage at all. HOWEVER, i did manage to fix the old switch by replacing the disintegrated magnet with a different magnet. it works in forward and reverse. YAY! it took me a few hours with a dremel tool and a neodydmium, or however its spelled, magnet. i basically had to trim the magnet into 2 tiny square blocks and super glued them in place making sure that both magnets that were facing downward toward the sensor were the same polarity.
Nige
Senior Member
That’s disappointing. I wonder if the manufacturer would supply some details about how it’s supposed to work such as input voltage requirements, etc.
quiksilvr
Well-Known Member
yea i hope they do something bcuz that switch cost $100 delivered to my door lol
quiksilvr
Well-Known Member
here is what i have as far as specs go for that switch...
Nige
Senior Member
Well there's something straight off. Required supply voltage is in the range of 4.5-5.5v DC with 5v being the target figure.
In a Cat SSL the switch is being supplied with a stabilized 8v DC supply produced internally within the ECM.
Do you have any way of supplying it with 5v DC and see how it behaves then.?
Also try connecting a DMM between the switch "output signal" wire and machine frame ground instead of the stabliized power ground that you connected it to before. See if that makes any difference.
Not sure about the voltage output options TBH. Can you measure the voltage from your repaired switch at 3 positions (centre, full FWD, & full REV) and post up the results.
In a Cat SSL the switch is being supplied with a stabilized 8v DC supply produced internally within the ECM.
Do you have any way of supplying it with 5v DC and see how it behaves then.?
Also try connecting a DMM between the switch "output signal" wire and machine frame ground instead of the stabliized power ground that you connected it to before. See if that makes any difference.
Not sure about the voltage output options TBH. Can you measure the voltage from your repaired switch at 3 positions (centre, full FWD, & full REV) and post up the results.
quiksilvr
Well-Known Member
ya know i was thinking the same thing. ill see what i can do as far as supplying it with 5v. as for the ground, i tried ground at the switch and the machine ground and the reading was the same. i will take measurements of the repaired switch and post them here in a lil bit
quiksilvr
Well-Known Member
ok well i supplied the NEW switch with 5.08vdc, and the readings i got at center: 2.89vdc, full forward: 4.52vdc and full reverse: .508vdc
Nige
Senior Member
So that would seem to indicate that it doesn’t like being supplied with 8v....
quiksilvr
Well-Known Member
yea ur right about that. i guess i didnt do my homework as well as i thought i had. interestingly enough, on the old switch being modified, with the supply voltage obviously being 8vdc the voltage on the output wire was 5vdc@ center, 6vdc@ full forward and 4vdc@ full reverse. so the internals of the switch must have a voltage regulator? but none the less, i have no choice but to eat the cost of this switch and chalk it up as a lesson learned.
quiksilvr
Well-Known Member
so i guess the trick is going to be locating a similar switch that will function with 8vdc supply.
Nige
Senior Member
Or contact the switch manufacturer and inform them that you have an application where, due to machine on-board limitations, the supply to the switch MUST be 8v DC rather than 5v, and ask them if they can suggest a solution. You could also mention that it is a piece of mobile equipment that you are talking about.
quiksilvr
Well-Known Member
im on their site now looking to see if they have any listed. ill contact them and ask. im about 99.9% certain its made by otto, because the trigger switch on that same joystick says otto on it. why this switch doesnt have any markings is beyond me
Shan Singh
Member
Has anyone had success with any switches thus far?
quiksilvr
Well-Known Member
i had luck repairing mine, i just dug out the old magnet and replaced it with a rare earth magnet that was cut into 2 tiny pieces
Shan Singh
Member
Mine is completely missing unfortunately.
quiksilvr
Well-Known Member
the entire switch? damn that sucks. i do know that the maker of the switch is otto, at least mine was. i gave up looking after i fixed my switch. u can try contacting them. the switch needs to be designed to operate with an 8vdc power source. all the switches on their website are designed for 5vdc power source, so they wont work. i already tried one of them and ended up wasting around $100. lol
Shan Singh
Member
Do you have any idea on what is the output voltage for the switch when using 8vdc?
quiksilvr
Well-Known Member
yes, mine had 5.72v at center, 3.93v forward full travel and 4.94v reverse full travel. those were the initial readings prior to repairing the switch. i did not take any measurements after the repair tho.