M-series 2-speed MWFD: how does it "know" when to switch?

Gb540

New member
Jan 9, 2021
21
3
3
Central US
Looking into a more recent M-series, and one of the features is a two-speed for the front axle. Guess it switches itself to a higher speed when turning for a tighter turning radius.

Question is: how does the system "know" when to switch?

Looked at the parts illustrations, found the clutch packs but didn't see anything that senses steering angle. Wondering what makes the system work.
 

eserv

Well-known member

Equipment
BX24, A1000 Kubota Generator
May 27, 2009
2,101
93
48
Hardisty, Alberta
Looking into a more recent M-series, and one of the features is a two-speed for the front axle. Guess it switches itself to a higher speed when turning for a tighter turning radius.

Question is: how does the system "know" when to switch?

Looked at the parts illustrations, found the clutch packs but didn't see anything that senses steering angle. Wondering what makes the system work.
It is activated by a switch at the top of the left kingpin on the front axle
 
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SDT

Well-known member

Equipment
multiple and various
Apr 15, 2018
2,482
525
113
SE, IN
Looking into a more recent M-series, and one of the features is a two-speed for the front axle. Guess it switches itself to a higher speed when turning for a tighter turning radius.

Question is: how does the system "know" when to switch?

Looked at the parts illustrations, found the clutch packs but didn't see anything that senses steering angle. Wondering what makes the system work.
Didn't know that Kubota still offered Bi-Speed Turn.

I have it on my 1994 B1750HSD.

Mechanical linkage connects steering arm to gearbox shifting to Hi when steering within 30% of full lock.

SDT
 

eserv

Well-known member

Equipment
BX24, A1000 Kubota Generator
May 27, 2009
2,101
93
48
Hardisty, Alberta
Didn't know that Kubota still offered Bi-Speed Turn.

I have it on my 1994 B1750HSD.

Mechanical linkage connects steering arm to gearbox shifting to Hi when steering within 30% of full lock.

SDT
It is on the Kubota built power shift tractors