Nordson VersaBlue VB Series, Manual

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Maintenance
5-10
P/N 7105144G
2008 Nordson Corporation VersaBlue_NW
Gear Pump
Checking for Leakage
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.
Tightening Gland
NOTE: Tighten only when the melter and the pump are warm.
Tighten 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
Pumps with Variseal
TM
NOTE: Pumps with Variseal
TM
differ from the pumps normally used in
Nordson melters (with gland) in that the shaft sealing bush is longer. If the
pump leaks, it must be replaced completely.
Tightening Fixing Screws
Normal heat cycling (heating and cooling) can cause the fixing screws to
become loose.
NOTE: Tighten the fixing screws only when the melter and the pump are
cold. Tighten only with a torque wrench (25 Nm / 220 Ibin).