This is from http://refrigeratedtrans.com/mag/transportation_replace_original_equipment/
"A good clutch adjustment begins by identifying the location of the
bearing. It should be positioned 1/2" to 9/16" from the clutch brake."
"After the bearing is set, adjust the truck linkage to allow the
clutch brake to squeeze a .010" feeler gauge between the bearing and
clutch brake when the pedal is no more than 1" to 1.5" from the floor.
Setting the clutch brake position too far from the floor reduces the
stroke to the clutch and could cause release problems and reduce brake
All that remains is checking the free-pedal
distance in the cab. With the pedal in the up position, there should be
1" to 3" of free pedal. The clutch is now adjusted correctly."