2. Disconnect the connector and vacuum hoses from the drive. Loosen the bolts and remove the drive.
3. At the 1st drive nipple, create a vacuum of 20 torr, and the fork should move to the right.
4. At the 2nd drive nipple, create a vacuum of 20 torr, and the fork should move to the left.
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5. If the drive operation differs from the specified one, replace the drive.
6. Install the drive in reverse order. Remove any remaining sealant and apply fresh sealant. Check the condition of the hoses and connector contacts. Replace damaged hoses.