power unit, and the relief valves are located at the insideof the left door. The return and suction filters are locatedat the top of the hydraulic tank.A pressure-compensated valve to change rod rpmaccording to drilling conditions is located at the insideof the left door.The four pumps provide oil as follows:l Pump one provides oil for right side trammingand slow and fast feed drilling.. Pump two provides oil for left side tramming,drill, and fast feed.. Pump three provides oil for high-speedtramming, rotation, and cooler.. Pump four provides oil for high-speed tramming,dust collector, centralizer, cylinders, and auto rodchanger (if so equipped).Oil CoolerThe oil cooler maintains safe temperatures forhydraulic oil and compressor oil in all climates and islocated at the top of the power unit. At lowtemperatures, the oil bypasses the coder through thecold bypass valve.Air SystemThe air system consists of a compressor air end,receiver tank, blow air circuit, dust collector (if soequipped), and air lube system.The air end is connected to the engine with a flexiblecoupling. The compressed air is delivered to thereceiver tank, located at the backside of the power unit.The compressed air, mixed with compressor oil, isseparated from the oil in the receiver tank and isdistributed to each system. The separated compressoroil is sent to the oil cooler from the receiver tank underpressure. The compressor discharge air volume is 230cfm, and the discharge air pressure is 100 psi.NOTE: A common cause of low discharge airpressure is a clogged orifice muffler, located on theupper rear left comer of the rock drill.The dust collector is equipped with a stepping pulserthat sends discharged air every 20 seconds to knock offthe cuttings on the filter into the dropout chute, locatedat the bottom of the collector.CONTROL CONSOLEControls on the drill guide are only for drilling andcylinder movement.All other engine controls,tramming valve, and cylinder valve are located aroundthe operator’s seat, as shown in figure 14-22.BOOMThe rock drill is equipped with an expendable boom,commonly called a mast. The boom can vary 5 feet inlength from the fully retracted to the fully extendedposition. The extendable booms are constructed ofsquare steel tubing with a dump base holder at the frontend and a clevis at the rear end. The clevis is hinged toa pedestal that is held in the boom base clevis by akingpin.Figure 14-22.—Operator's control console.14-17
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