CHAPTER 4MAINTENANCE4-1INTRODUCTION4-1.1 Scope. This chapter provides instructions for locating and correcting failures and unsatisfactory performanceproblems. Where repair requires that a component be disassembled, these instructions should only be accomplished tothe degree necessary to effect repairs. Some components of the drilling machine, due to their complexity andmanufacturing process, are not recommended for repair by other than the manufacturer. When instructions are notprovided in this manual for an item, repair should not be attempted.4-2 TROUBLESHOOTING4-2.1Introduction. The troubleshooting table, Table 4-1 is provided to assist operation and maintenance personnel inlocating the cause of a malfunction. This table is designed to cover the most common or likely problems that may occur,but cannot cover every conceivable malfunction. In providing possible causes to a problem consideration is not given tocauses such as improper control settings or empty reservoirs. Any time a problem occurs, check first to see that allcontrols are positioned correctly, that switches are correctly set and that liquids are at their proper levels.Table 4-1. TroubleshootingPROBLEMPOSSIBLE CAUSEREMEDYPOWER TAKE-OFFClutch slippingOut of adjustmentAdjust clutch.Greasy/oily platesClean.Clutch self-engages.1.AdjustmentCheck and correct adjustment.2.Worn partsCheck linkage and release collar forwear.Clutch will not re-Pilot bearingCheck for broken or frozen pilot bear-leaseing.Excessive heatOutput shaft bearingsCheck bearing adjustment and for over-running hot.supply of lubricant.SUBDRIVE ASSEMBLYOutput shaft ro-Stretched drive chain;Replace drive chain.tates unevenlyworn chain rollers; orbinding on sprockets.Excessive noise1.Drive chain binding.Replace drive chain and sprockets.2.Worn or burnedReplace bearings.bearings.4-1
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