Service and Repair Manual April 2017Boom Components20 GTH-844 Part No. 1272854How to Adj ust the Boom Angle Proxi mity Swi tchHow to Adjust the Boom AngleProximity SwitchThe boom angle proximity switch is attached to amounting bracket, located between the boom andthe chassis directly beneath the boom pivot pin.The switch location is adjustable.1 Start the engine.2 Raise the boom to 60°. Confirm with a digitallevel.3 Working at the pivot end of the boom, locatethe boom angle proximity switch. Loosen thefasteners, securing the proximity switchassembly to the chassis, just enough to allowthe bracket to move.4 Move the proximity switch assembly until thelight of the proximity switch turns on, thenmove the proximity switch assembly until thelight of the proximity switch just turns off.5 Securely tighten the fasteners. Do not overtighten.6 Lower the machine to 55°.Result: The light of the proximity switchassembly is illuminated.7 Raise the boom to 60°. Confirm with a digitallevel.Result: The light of the proximity switchassembly is not illuminated. The proximityswitch is properly calibrated.Result: The light of the proximity switchassembly is illuminated. The proximity switchis not calibrated correctly. Repeat thisprocedure beginning with step 4.1-2BoomHow to R eplac e the Boom Wear PadsHow to Replace the Boom WearPads1 Lower wear pads: Using a lifting strap from anoverhead crane or a fork lift of sufficientcapacity, lift the boom tube just enough toremove the weight from the pads.2 Remove the wear pad retainer plates andremove the wear pads from the boom.3 Lubricate the wear surface of the new pads.Refer to Maintenance Procedure, Lubricatethe Boom.Note: Do not lubricate the side wear pads.4 Install the wear pads. Install and securelytighten the retainer plates. Do not over tighten.
