Installation
3-15
Part 237478_03
E 2012 Nordson Corporation
Relieving Hydraulic Pressure
WARNING: Hydraulic pressure must be properly relieved before you can
safely complete many of the installation, troubleshooting, maintenance, and
repair activities in this manual. Follow this procedure whenever you are
instructed to relieve hydraulic pressure.
CAUTION: Hot! Risk of burns. Hot applicator parts, splashed hot melt
material, and hot gun surfaces can cause severe burns. Wear long‐sleeved,
heat‐protective clothing, safety goggles, and heat‐protective gloves. Hot melt
material may be released forcefully.
Follow this procedure before disassembling and replacing any gun
components.
1. Allow the system to reach operating temperature.
2. Re‐tighten all gun‐to‐applicator and gun‐to‐hose fittings.
3. Wipe off any hot melt material on the gun fittings.
NOTE: The following procedures for relieving pump hydraulic pressure
are general. Refer to the applicator product manual for specific
instructions.
4. Relieve pump hydraulic pressure:
Table 3‐2 Procedure for Relieving Hydraulic Pressure
Unit Type
Procedure
Blue Series and Series 3000
(Piston Pump)
Reduce pump pressure to zero.
Disconnect the incoming air line.
Series 3000 Gear Pump (with AC drive) Push the motor START/STOP switch to
the OFF position.
Series 3000 Gear Pump
(with DC drive)
Turn the motor speed dial to 0%.
OmniScan control panel Push the pump touchpad until the LCD
shows PMP OFF.
Series 6000 Stop the motors by placing the
MOTOR ON/OFF switches in the OFF
position.
All other units Consult the applicator product manual.
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