4 minute read
Major hydraulic components (feeder breaker) .........5
hydraulic oil tank
hydrostatic pump
tandem gear pump
primary valve bank
power fill pump
tilt hydraulic cylinders
lift hydraulic cylinders
tram motors
conveyor motor Major hydraulic components (feeder breaker)
(Reference Fig. 24)
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 and thermometer.
The hydrostatic pump located within the power unit is a axial piston, variable displacement and electronic displacement control pump that supplies hydraulic power to the conveyor.
The tandem gear pump located within the power unit supplies hydraulic power to the tram drive motors, tilt and lift cylinder circuits.
The primary valve bank located on the left hand side of the machine is used to control the machines, tilt, lift, tram and power fill functions. All sections of the valve bank are spring return (self centering) except for the power fill section which is detented.
The power fill pump is located on the left hand side of the discharge section of the machine on top of the oil tank and is used to replenish fluid to the hydraulic tank from an external source. The pump is capable of delivering approximately 5 gallons of fluid per 30 seconds.
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.
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 tram motors are located to the inside of each crawler assembly and are used to supply power to the torque hubs for tramming operations. Each tram motor is individually controlled by separate sections of the tram valve bank.
The conveyor motor is located on the left hand side of the head shaft and is a radial piston motor that receives hydraulic fluid from the hydraulic pump. The motor is controlled from the two position conveyor direction control valve.
© DBT AMERICA 2007
loop flush valve
heat exchanger
two position conveyor direction control valve
charge filter
pressure filter (s)
return filter
tank fill filter
pressure filter (hydrostatic)
ball valve
Conveyor speed pressure reducing valve
discharge boom valve bank The machine is equipped with a loop flush valve located on the discharge end of the machine on the frame side plate behind the hydrostatic pump. The valve is used to dump approximately 30% of the charge oil to the low pressure side of the circuit.
The heat exchanger located on the right side of the machine is used to remove heat from the hydraulic circuit prior to dumping into tank.
The two (2) position conveyor control valve located above the left hand crawler is used to control the conveyor direction of travel.
The charge filter located under the gear pump on the right hand side of the machine is used to filter the charge fluid. The filter removes hot oil from the circuit, allowing the charge pump to replenish the circuit with cooler oil.
Two (2) pressure filter (s) are located above the crawler on the left hand side of the machine and are used to filter fluid on the pressure side of the circuit.
The return filter located on the left hand side of the of the discharge end of the machine is used to filter fluid from the case drains of the hydraulic pump and motors.
The power fill filter located on top of the oil tank is used to filter fluid that is being pumped with the power fill system from an external source to the hydraulic oil tank.
The pressure filter located under the gear pump is used to filter fluid that is being pumped by the hydrostatic pump.
The ball valve is located on the left hand side of the discharge section of the machine on top of the oil tank and is used to control the flow of hydraulic fluid from the power fill pump.
The pressure reducing valve located above the left hand crawler of the machine is used to control the speed of the conveyor.
The discharge boom valve bank located on the left hand side of the machine is used to control the discharge boom’s steering and lift functions. Both sections of the valve bank are spring return (self centering).
