wiper cable motor access?

[Neo]

I did search first, but to no avail,
My wipers are making a loud knock when at the far left part of the swing. I figure they probably need a little TLC (cleaning, grease etc) and want to get in there and perform the needed service. Do I access all the through the dash? I took the part with the guages off, and can't see the motor or cable there. Any suggestions? Thsi seems like it shoudl not be that difficult. Thanks for any help.

[Maryland 110]

The lower left corner of the dash (padded black part) that is about 8-10 inches long is called the wiper cover. Some trucks have switches mounted here depending on year model. The wiper motor is held to the bulkhead by a band (two screws) and a single bolt. The wiper "rack" is a simple worm drive cable. With the arms and blades removed from the posts out on the windsheild you can simply pull the motor and cable out as a unit once you have removed the fasteners and unpluged the wiring multi plug @ the top of the motor. These things are supposed to be liberally greased. I suggest using synthetic-especially if you are in an area that gets below 0 f. Suggest you get a workshop manual.