2. STRUCTURAL CHARACTERISTICS AND WORKING PRINCIPLE
HAVA1000PI/PIK manual stacker consists of a hydraulic system, mast and forks.
The stacker uses a manual hydraulic pump (hydraulic device) as a force to lift heavy goods, which are pushed,
pulled and handled manually. The hydraulic device is equipped with an oil return valve and the fork decline
speed is controlled via a hand lever to make the operation of the hydraulic system correct, safe and reliable.
The mast is welded with high quality profile steel with features such as good rigidity and high strength.
Universal wheels with braking device are adopted as the back wheels, which can rotate freely, easily and
flexibly. Both front and back wheels are installed on wheel shafts with ball bearings so as to rotate flexibly.
Wear-resistant and durable Nylon wheels are adopted so that it is not easy to damage the operation ground.
When lifting goods, insert the forks under the pallet of the goods. When necessary, break the back wheels.
Set the control hand lever to the lowest position and pull the handle. The pinch roller presses the pump core
to make the oil in the pump cylinder flow into the piston cylinder, in order to push the piston rod move upward
and lift the forks upward via a chain for a two times travel. Pull the handle back and forth so as to lift the goods
and achieve the purpose of lifting. When the forks are lifted to the maximum height, the pressurized oil flows
back into the oil tank via an oil draining hole and in that case, even the handle is pulled, the forks raise no
more to avoid damaging components by impacting the top. Stacker is also equipped with a leg operated pump.
By pumping the pedal (control hand lever in the lowest position) the forks will rise.
When handling heavy goods, the stacker is able to travel via manual pushing (pulling).
When unloading, pull the control hand lever slowly. The oil return valve opens and with the effect of the dead
weight of the heavy goods and forks, the operational oil in the piston cylinder flows back into the oil tank
through the oil return valve. When the piston rod and the forks decline to the lowest position, the goods are
unloaded and the forks can be withdrawn. For safety reasons, when lowering the goods, the control hand lever
should be operated slowly and in a controlled manner.
3. OPERATION CONDITIONS
The operation of HAVA1000PI/PIK manual stacker should meet following conditions:
1. Ambient temperature for operation: -25ºC~+40ºC.
2. The relative humidity of the environment should be less than 90%RH.
3. The stacker can only operate in an environment without rain and harmful gas erosion.
4. The stacker can only operate indoors on even and solid ground.
4. OPERATION AND MAINTENANCE
1. The oil must be filtered and clean. Sufficient oil quantity and quality must be ensured.
2. Before operation, inspection must be conducted for the stacker to ensure the stacker is in
normal condition and there are not any loose or defective components. It is forbidden to use a
defective product, it must be removed from service immediately.
3. The load should be smoothly distributed on the forks and no overload is allowed.
4. After the operation is completed, the goods should be unloaded. Heavy goods are not
allowed to be on the forks for a long time.