OPTIMIZER
TM
56
3.3 TAILGATE LOCKING MECHANISM TROUBLESHOOTING
The tailgate locking mechanism is equipped with hydraulic safety systems that prevent
accidental unlocking of the tailgate during operation. One of the systems is the velocity fuse
with the “power bleed” and the other is the holding valve.
The spool inside the tailgate section of the valve is designed in such a way, that it will allow
pressure to pass through it each time the pressure is building up in the hydraulic system (i.e.:
when the packer is working). The pressure “burst” goes to the holding valve into port “D1”
and then out to the cylinder by port “U1”. This will keep the tailgate cylinders pressurized and
the tailgate closed when packing material.
The velocity fuse, located on the valve (Figure #3.3), will make sure to drain any slow moving
oil coming from the piston side of the tailgate cylinders. Since the rod side is being pressurized
with the “Power bleed” system, the other side has to drain to avoid any pressure build-up.
The velocity fuse makes the piston side open to tank when the oil is moving under 3 gallons
per minute and will shut when a flow signal is sent.
NOTE: Refer to the main hydraulic schematic.
Holding valve
Tailgate
Port
U2
Port U1
Port D1
Port D2
FIGURE #3.2
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