340 Troubleshooting
Figure 8-7
Injecting compressed air
IMPORTANT: If air is leaking by the opposite port of the pressurized side of the actuator when both tubes are
removed, this could indicate that the o-ring on the air actuator piston is leaking. If needed
disassemble, clean, and lubricate with grease, or replace the o-ring.
Tailgate-Locking Mechanism
NOTE: Refer to “Hydraulic Schematics” on page 305.
The tailgate-locking mechanism is equipped with hydraulic safety components that prevent
accidental unlocking of the tailgate during operation. One of the safety components is the velocity
fuse with a power bleed feature, the other is the holding valve (see Figure 8-9).
The spool inside the tailgate section of the valve is designed in such a way as to allow pressure to pass
through it every time pressure is building up in the hydraulic system (that is 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 (see Figure 8-9). This will keep the tailgate cylinders pressurized and the tailgate closed
when packing refuse.
The velocity fuse (see Figure 8-8) 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 close when a flow signal
is sent.
Inject
compressed
air here
Hydraulic spool
should move back
and forth
To Next Page
Loading...
Need help?
General
