MKT V-22/HP-380T4, Руководство по эксплуатации, техническому обслуживанию и каталог запасных частей

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V. START UP PROCEDURES (CONTINUED)
F. HYDRAULIC CIRCUITRY (CONTINUED)
The hydraulic motor on the V-22 hammer is powered by a piston pump operating
in a closed-loop circuit. A small amount of motor flushing oil is taken through an
orifice fitting on the clamp close line. The pressure compensated clamp pump
will continuously flush the motor with approximately 3/4 - 1 GPM of oil while the
clamp is in the closed position.
The hydraulic motor also has a relief valve installed in the case drain port. This
relief valve is set at 80 PSI to provide protection from over-pressurization of the
case drain line due to blockage or high internal motor leakage.
The pump is stroked from the zero position by the means of a hydraulic pilot
signal. The signal is received from a small, 12 volt solenoid operated, directional
control valve which may be located on the power unit skid or as an integral part
of the pump. The pump has its own charge pump built into the pump housing
and a pressure limiter system which destrokes the pump when a maximum
pressure has been reached. Hydraulic fluid returning from the V-22 hammer
motor is directed through a hydraulic filter before returning to the pump. The
filter is located just inside of the power unit behind the bulkhead. Charge
pressure oil on the pump is directed through a spin-on type filter located on the
bottom of the pump. Warm hydraulic fluid is split off from the closed-loop circuit
through a hot oil shuttle valve. The hot oil shuttle valve is mounted to a manifold
which also supports the hydraulic filter. Warm oil from the shuttle valve is
directed through the pump case and into a hydraulic oil cooler located in front of
the engine radiator. Oil is then routed from the cooler back to the hydraulic
reservoir.
G. START UP LIST
1. Open all enclosure doors.
2. Check engine water, fuel, and shut down solenoid to be sure it is locked in
the proper position. Check hydraulic fluid.
3. Connect electrical pendant if the hammer will be operated from the remote
pendant position.
4. Turn the control panel power switch to the remote or panel position. The
remote pendant should not be connected if the hammer is being operated
from the controls located on the control panel. A green lamp on the control
panel will indicate that the power is on.
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