Page 11
November, 2003
400 Operator And
455 D Control Panel Installation Manual
BLEED THE OPERATOR
Air bubbles in hydraulic fluid cause erratic performance
in a hydraulic system, so you must rid the 400
Operator of that air to insure smooth operation.
If you have removed the vent screw, the 400 operator
should bleed itself. Running the operator should
remove any air from the system. If the operator runs
smooth throughout the swing, no attempt to further
bleed the unit is necessary.
If the operator runs erratic, perform 10 bleeding
operations. One bleeding operation consists of
automatically opening and closing the gate and then
pausing for two minutes. The 2-min pause allows the
air bubbles to escape through the vent screw hole.
Figure 8. Install the locking cap cover
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