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Hydraulic system ................................................................5
Hydraulic system
The following pages contain a brief description of the hydraulic components and assemblies that are on the feeder breaker.
The primary hydraulic system for this machine has been designed to provide hydraulic power for the conveyor drive motor, tram motors, tilt cylinders and lift cylinders.
WARNING! This section is intended only to familiarize the user with the hydraulic components of the feeder breaker. All hydraulic maintenance should be performed only by a qualified technician with the knowledge of the function of the components involved.
WARNING! Never disconnect a hydraulic hose if the circuit is pressurized or if there is a load on the circuit. If a hose is disconnected while the circuit is pressurized or a load is on the circuit, the load will fall causing damage to the machine or serious injury or death to you or other workers.
valve bank
enabler valve
system pressure gauge
open loop load sense pump
piggyback gear pump
return filter
pressure filter
power fill, hydraulic oil
air/oil heat exchanger
water/oil heat exchanger
hydraulic oil tank with sight glass and thermometer Major hydraulic components
The valve bank is used to control the machine’s conveyor 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 conveyor/tram enabler valve is located behind the valve bank. The valve is used to disable the conveyor sections of the valve bank when the “TRAM/OFF/CONVEYOR”switch is in the “TRAM”position or to disable the tram, tilt and lift cylinder, and jet fill sections of the valve bank when the “TRAM/OFF/CONVEYOR”switch is in the “CONVEYOR”position by blocking the load sense signal from the valve section intended to be non-functional.
The system pressure will display the system pressure for the active function.
The open loop load sense pump is a part of the power unit and supplies hydraulic fluid to all hydraulic functions on the machine.
The piggyback gear pump is bolted to the rear of the open loop load sense pump. This pump supplies hydraulic fluid to the main pump and the conveyor motor for cooling purposes. This pump also supplies hydraulic fluid to drive the fan motor on the hydraulic oil/air heat exchanger, if equipped.
The return filter is used to filter fluid on the return side of the hydraulic circuit and as the power fill filter.
The pressure filter is used to filter fluid on the pressure side of the hydraulic circuit.
The hydraulic oil power fill system consists of a ball valve and fill pump. This power fill function on the valve bank must be opened engaged before opening the ball valve. The tank fill pump is a flow divider that is hosed to run backwards from normal flow divider operation and is used to replenish oil supply. It is capable of delivering approximately 5 gallons of fluid per 30 seconds.
The air/oil heat exchanger is used to cool the hydraulic fluid during tramming and conveying. It is equipped with a hydraulic motor driven fan.
The water/oil heat exchanger is used to cool the hydraulic fluid when conveying and is part of the dust suppression system.
The hydraulic oil tank has a 125 gallon capacity. The hydraulic oil temperature and level is monitored by a temperature probe and float switch. The tank is equipped with a sight glass and thermometer.
The frame 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.
The frame 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. The cylinders are controlled by one section of the primary valve bank.
frame lift cylinders
frame tilt cylinders
tram motors 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.
The tram motors are located to the inside of each crawler assembly and are used to supply torque to the torque hubs for tramming operations. Each tram motor is individually controlled by separate sections of the primary valve bank.
