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9.6
TAILGATE OPERATION
9.6.1
OPEN TAILGATE
The tailgate must be unlocked prior to significantly elevating the body; otherwise, the load builds up
against the tailgate, causing undue forces on the body structure and greatly increases the risk of
tip-over. The locking mechanism should be checked daily for proper operation.
9.6.2
LOCK TAILGATE
The dump must be completely down to close the tailgate and lock it. Also some automatic latches
must be activated from the cab to lock the tailgate. Manufacturers’ recommendations must be
followed to insure proper locking. Tailgate should be closed and locked before leaving dump sight.
9.6.3
TAILGATE SAFETY REMINDERS
Check tailgate lock for proper operation and hook engagement. Check tailgate hook area for
possible load material interference. Check tailgate contact with body before opening gate. Pushing
on the tailgate with bulldozers or loaders will damage the tailgate and affect tailgate operations.
9.7
HOIST OPERATION
9.7.1
POWER TAKE-OFF CONTROLS
The power take-off (PTO) unit is an auxiliary unit, which bolts onto the transmission and is used to
drive the hydraulic pump to lift the body. Most hydraulic pumps are rated from 1,000 to 2,000 psi.
The motor should not exceed rated rpm, as high speeds shorten pump life and create high
pressures that may cause seal blowouts in the cylinder.
9.7.2
HOIST CONTROL
The hoist control is usually a three-way valve, having three positions—“LIFT”, “HOLD” and
“LOWER”—and is located in the tractor cab. The valve controls the flow of hydraulic fluid from the
pump to the hoist cylinder.
9.7.3
OPERATION OF HOIST
The power take-off is engaged, the pump valve is shifted into the “LIFT” position, and the engine is
speeded up as required to lift the body. If necessary, the pump valve can be shifted into the “HOLD”
position to maintain proper material discharge speed and then again shifted into the “LIFT” position.
SPREADING MUST BE RESTRICTED TO LEVEL, COMPACTED
ROAD SURFACES AND TO MATERIALS WHICH ARE FREE
FLOWING. THE BODY MUST BE RAISED IN INCREMENTS SO
THAT THE LOAD IS KEPT TOWARD THE REAR.
DISENGAGE POWER TAKE-OFF BEFORE LEAVING THE DUMP
SITE BECAUSE OVERSPEEDING THE PUMP CAN PRODUCE
ENOUGH PRESSURE TO PARTIALLY RAISE THE BODY.
LINK TO VENDOR FILE
