Figure 9-40.—Remote hand throttle assembly.4. The loader is equipped with a remote handthrottle assembly (fig. 9-40) located on the front coverof the loader, which is behind the backhoe operator’sseat. The hand throttle is preset to the backhoespecifications to deliver the proper amount of hydraulicoil flow for backhoe operations. The speed of the enginedetermines the volume of hydraulic oil delivered to thebackhoe and the speed of the cylinder movements.Because of this, you should set the engine at a low speeduntil you are familiar with the control lever pattern.NOTE: The backhoe is designed to operate effi-ciently at a preset gallons per minute flow of hydraulicfluid. Setting the engine throttle in excess of that set forbackhoe operations creates excessive hydraulictemperatures and pressures that can damage hydraulicand structural components.5. Lower the backhoe stabilizer legs to fix thebackhoe in position.6. Warm up the backhoe hydraulic system byextending and retracting each hydraulic cylinder pistonrod several times to circulate warm oil through thehydraulic system. When the backhoe hoses feel warmwhen touched, the backhoe is ready for operation.WARNINGBefore performing maintenance on thebackhoe, you must extend the dipper stick fullyand set the bucket and stabilizer on the ground.Shut down the engine, and actuate all of thecontrol levers back and forth to relieve thehydraulic pressure in the system.Loader BackhoeThe loader backhoe tractor (fig. 9-41) is equippedwith a 1.3-cubic-yard bucket mounted on the front andthe backhoe mounted on the rear.The loader is equipped with a four-speed transaxlethat permits the gears to be shifted from first or secondto third or fourth and back again to third withoutstopping. When shifting gears, always make sure theengine speed remains in the green area of thetachometer.The loader also has a differential lock that givesequal power to both rear wheels when the machine isstuck or before the loader is operated through a soft ormuddy area. When the loader is stuck, the differentiallock is actuated as follows:1.2.3.4.5.Make sure the rear wheels are not turning.Push down the clutch cutout pedal (fig. 9-42).Push down the differential lock pedal.Release the clutch cutout pedal.Increase the engine speed and release thedifferential lock pedal.NOTE: The differential lock releases automaticallywhen the load is removed.9-16
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