Hello everyone, recently I took apart my dash, part number k2771-62510 because the seal was bad and I wanted to get rid of the condensation inside. Upon opening it up there was a lot of rust on the tachometer gearing so I cleaned it up. Once I sealed it up properly and plugged it back in I noticed the rpm was showing less than what it should at idle. I probably just messed it up permanently but does anyone know of how to align the gears so its accurate?
Tachometer on dash not displaying properly
- Thread starter vbkubota
- Start date
How did you 'clean it up' ? Old skool tachs are based on mechanical clock tech... so they need to be properly cleaned and very.,very lightly oiled with 'clock' oil not '10W30'.
Low reading would indicate 'drag' or 'friction', so could need to be cleaned again and once more for good luck. It's nice to use low pressure air to lightly blast 'gunk' (you can't see) out of the mechanism. I've got 80 year old MECCANO clockwork motors that still run fine. I use a toothpick to give the bearings a wee drip of 'sewing machine' oil.
Low reading would indicate 'drag' or 'friction', so could need to be cleaned again and once more for good luck. It's nice to use low pressure air to lightly blast 'gunk' (you can't see) out of the mechanism. I've got 80 year old MECCANO clockwork motors that still run fine. I use a toothpick to give the bearings a wee drip of 'sewing machine' oil.
Old Machinist
Well-known member
Equipment
Kubota LX3310 cab, JD4120, JD4410, JD F725, Swisher 60", etc.
I recently cleaned up a panel off one of my John Deere tractors. I pulled all the indicator needles off and later discovered I didn't need to. To get them back kind of where they needed to be I set the fuel and temp needles back on at the bottom with it plugged in and ignition turned on. For the tach I used an inductive digital and set the RPMs around 1500 then set the needle back on with it running. Then I checked and cross referenced with the inductive tach at idle and 2500. This particular tractor gets it's RPM reading off the alternator so I adjusted the alternator belt before I started to make sure it wasn't slipping.
The glass on this JD had a "anti-fog" coating on the glass that had turned cloudy and I had to clean that off with brake cleaner. I don't know if or how it will hold up but I treated both sides of the glass with Rain-X Interior Glass Anti-Fog glass cleaner.
The glass on this JD had a "anti-fog" coating on the glass that had turned cloudy and I had to clean that off with brake cleaner. I don't know if or how it will hold up but I treated both sides of the glass with Rain-X Interior Glass Anti-Fog glass cleaner.
The magnets on the tach were all rusted up so I just used a soft toothbrush and isopropyl to clean it up. I don't really remember it having oil in there. I think I should clarify that when I say low reading I also mean that the pointer would go below 0 rpm. Almost as if the gears were misaligned.
hmm, to clarify, the pointer is below zero... 'sitting on the bench' ?
if so, remove pointer and press it back on at zero.
if so, remove pointer and press it back on at zero.
