California
Super Star Member
- Joined
- Jan 22, 2004
- Messages
- 14,344
- Location
- An hour north of San Francisco
- Tractor
- Yanmar YM240 Yanmar YM186D
This is the first clear picture I've ever seen showing how the YM differential lock mechanism works. I thought others might be interested.
I'm linking to relhogh's picture here, he posted it in his thread about repairing the brakes on his YM1500D Green.
The way the difflock works is sort of Mickey Mouse. Push the pedal under your right heel, that rotates the shaft going into the transmission. This forces the doubled rollpin to climb the ramps of the shifter fork. The fork then forces the diff lock collar sideways, engaging its pins into the recesses of the gear next to it.
This is notable to me because my YM186D needed this repaired before I put it in service. That ramp was worn away where the rollpin meets it, I think because the tractor was used for a couple of decades clearing snow and the operator was on the difflock pedal all the time. Welding some metal on the ramp (then grind/polish) to restore its shape was all it needed, now it's good again for many years.
And here's the badly worn ramp on my YM186D before repair.
I'm linking to relhogh's picture here, he posted it in his thread about repairing the brakes on his YM1500D Green.
The way the difflock works is sort of Mickey Mouse. Push the pedal under your right heel, that rotates the shaft going into the transmission. This forces the doubled rollpin to climb the ramps of the shifter fork. The fork then forces the diff lock collar sideways, engaging its pins into the recesses of the gear next to it.
This is notable to me because my YM186D needed this repaired before I put it in service. That ramp was worn away where the rollpin meets it, I think because the tractor was used for a couple of decades clearing snow and the operator was on the difflock pedal all the time. Welding some metal on the ramp (then grind/polish) to restore its shape was all it needed, now it's good again for many years.
And here's the badly worn ramp on my YM186D before repair.