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Model 640 & 640CC Instruction Manual
D01206676
Revision A February 2016
39
9.
Make certain that heater gaskets came out with the heater. If the gaskets did
not come out, a 7/16-inch bolt or rod inserted through the bottom of the heater
holes will normally snag the gasket and push it out. In lieu of this, a
screwdriver may be used to push the gasket out. Be careful not to damage the
sealing surface inside the heater holes.
10.
Clean the bottom of the pressure vessel and the heater holes before installing
new heater. Assembly is the reverse of assembly.
A deep socket or a piece of 3/8-inch tubing may be placed over
the heater terminals and used as punch to loosen the heater
ferrules.
With the heater gaskets removed from the heater insure that the
heater is bent so that it drops through the heater holes with
minimal effort and that the heater coils lay flat against the pressure
vessel bore. Forcing the heater into the holes usually deforms the
heater and makes the slurry rub the heater. An installed heater is
almost impossible to bend.