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[Marks DTM Calib]

If your seat is no longer going up and down on the electric height adjuster but, the motor can still be heard then this may be for you.

First off all look under the seat and wipe and lube the worm drive (note  PTFE spray or a similar dry lube is best) and remove the plastic cover by easing the pegs in the side out of the locating holes in the seat frame.



If you look up the tube where the worm drive mounts you will see a 13mm nut on the end of the worm drive.



Insert a small 13mm socket (i.e. 3/8 drive) on an extension bar into the tube and using the ratchet, rotate the drive a few turns.



Job done, refit the plastic cover and operate the electric height adjuster through its full travel a few times.

Note, it can be difficult to get at the worm drive if the seat as at its full bottom travel, if this is the case it may be best to remove the 4 torx headed bolts, one at each end of the seat runners (slide the seat to gain better access) and tilt it toward the B post (saves disconnecting the wiring!)