National Vacuum Equipment WPT 480/P Owner's Manual And Operating Instructions - page 24
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5.
Loosen the bolt holding the
endplate to the housing and remove
the endplate.
Push the lock ring toward the fitting
while pulling the oil line out of the
fitting.
3. Remove the coolant line from the rear endplate.
4. Remove the bolts holding the water pump to the
endplate and remove the water pump assembly.
Make sure not to lose the pump drive tab.
For pumps without the built-in water pump, simply
remove the bearing cover with the oil pump
attached.