Deore XT front changer problems...?

[Kenneth]

Howdy,

I am having trouble with my Deore XT front changer on my 3 X
8 touring bicycle. The levers are Shimano 600.

(I get the triple front with a cam gadget...)

The problem is that if I am on the large ring and click to
shift to the middle ring, I jump instead to the small ring.

If I am on the middle ring, the upshift to the large ring is
perfect.

I no longer have the installation or adjustment information.

Might you assist?

Sincere thanks for any information,
--
Kenneth

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