10
Hydraulic
Requirements
The life of the hydraulic componentry is almost entirely dependent upon
cleanliness of the oil. Instructions in your vehicle operator’s manual regarding
filter and oil changes should be carefully followed. Even small amounts of dirt
in the hydraulic oil can cause premature hydraulic componentry failure that is not
covered by warranty.
Filtration Requirements:
•
A filter of, at least, 25 micron filtration is required. A filter capable of 10 micron filtration
is preferred. The majority of paper type filters are 25 microns or better.
• A low pressure type filter can be installed in the return line from the control valves to the
sump. A low pressure type filter can also be installed in the sump or pump intake line but
must be sized large enough to avoid starving the pump.
• A high pressure type filter can be used between the pump and the control valves.
• If the source of the hydraulic power does not have a filter, it will be necessary to install
one at some point in the system so, at least, part of the hydraulic oil is being filtered
whenever the system is operating. After a filter is installed and before attaching the Post
Driver, the entire hydraulic system should be drained, filled with new oil, and operated
for 30 minutes or until the system is warm. During this run time, operate all valves,
cylinders, and hydraulic components on the equipment.
Pressure and Flow Requirements:
• The Post Driver is designed to operate up to 30 GPM and 1500 – 3000 PSI.
Valve Requirements:
• The hydraulic system used to power the Post Driver should be equipped with a four-way
valve large enough to carry full pump outlet without restricting flow and causing oil
heating.
•
The four-way valve requires a relief valve which will open and relieve extreme pressures
between the Post Driver and control valve, even when the control valve is in a neutral
position. This feature can be obtained by connecting two external relief valves between
the main lines running from the control valve to the Post Driver in such a way that high
pressure in either line will be relieved to the other line.
Hydraulic Fluid Selection Requirements:
• Premium grade petroleum based fluids will provide the best performance.
• Fluids that contain anti-wear agents, rust inhibitors, anti-foaming agents, and oxidation
inhibitors are recommended.
• The viscosity of the fluid should never fall below 70 SUS (13 cST). The best viscosity
range for the Post Driver is 100-200 SUS (20-43 cST).
