Hydraulic system _____________________________________________ Major hydraulic components (Reference Fig. 30) hydraulic oil tank
The hydraulic oil tank located on the left hand side of the machine has a 175 gallon capacity and is equipped with a oil level sight glass, high temperature switch and low oil level switch.
hydrostatic pump
The hydrostatic pump located within the power unit is an axial piston, variable displacement and hydraulic displacement control pump that supplies hydraulic power to the conveyor. The gear pump located within the power unit supplies hydraulic power to the primary and secondary valve banks. The pump stroke and direction of flow is controlled by the proportional detented valve.
primary valve bank
The primary valve bank, located on the right hand side of the machine, is used to control the machine’ s tilt, lift, tram, and power fill functions and to control flow to the secondary valve bank. All sections of the valve bank are spring return (self centering) except for the power fill section which is detented.
secondary valve bank
The secondary valve bank, located at the head shaft on the right hand side of the machine, is used to control tailpiece steering and tilt, the roof cylinders, and the foot cylinders.
tank fill pump
The tank fill pump is located on the right hand side of the discharge section of the machine, to the left of the starter box, and is used to replenish oil to the hydraulic tank from an external source. The pump is capable of delivering approximately 5 gallons of fluid per 30 seconds.
tank fill hand pump
The tank fill hand pump is located directly behind the tank fill pump on the right side of the discharge section of the machine, to the left of the starter box, and is used to manually replenish oil to the hydraulic tank from an external source.
tilt hydraulic cylinders
The tilt hydraulic cylinders are located at the end of the crawler under the hopper on each side of the machine and are used to adjust the discharge height of the machine. Both cylinders are controlled by one section of the valve bank.
lift hydraulic cylinders
The lift hydraulic cylinders are located at the pivot point of the crawler on each side of the machine and are used to adjust the ground clearance of the machine. Each cylinder is individually controlled by separate sections of the valve bank. WARNING! The tilt and lift hydraulic cylinders have counterbalance cartridges which serve as load holding valves. Do not replace these cylinders with different style cylinders or the machine may fall. The machine could be damaged or you or other personnel could be seriously injured or killed by the falling machine. The machine is equipped with lock pins that should be installed when the unit is not being moved. Pin are located near the lift cylinders on both sides of the machine.
________________________________________________________________ 5.32 Bucyrus –Model 7MFBHM-48DD Feeder Breaker
© BUCYRUS AMERICA, INC.
gear pump
