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5-9
Maintenance
Gear Pumps with Gland
The gear pump is equipped with a self-sealing pump shaft seal. Material
may seep out of the seal at irregular intervals. The gland must then be
tightened.
NOTE: When the pump shaft seal needs to be replaced, Nordson
recommends replacing the pump and sending the old one in to be repaired.
Only trained personnel can replace the pump shaft seal.
Retighten gland
NOTE: Retighten only when the melter and the pump are warm.
Retighten the gland approx. ¼ of a revolution in the operating direction of
the pump. If tightening is no longer possible, the gear pump must be
replaced.
Fig. 5-8
Retightening Fixing Screws
Normal heat cycling (heating and cooling) can cause the fixing screws to
become loose.
NOTE: Retighten the fixing screws only when the melter and the pump are
cold. Retighten only with a torque wrench (25 Nm / 220 Ibin).
VBN w/o Control System
P/N 7146386A
E 2008 Nordson Corporation
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Troubleshooting
