CHAPTER 4
MAINTENANCE
4-1
INTRODUCTION
4-1.1 Scope. This chapter provides instructions for locating and correcting failures and unsatisfactory performance
problems. Where repair requires that a component be disassembled, these instructions should only be accomplished to
the degree necessary to effect repairs. Some components of the drilling machine, due to their complexity and
manufacturing process, are not recommended for repair by other than the manufacturer. When instructions are not
provided in this manual for an item, repair should not be attempted.
4-2 TROUBLESHOOTING
4-2.1 Introduction. The troubleshooting table, Table 4-1 is provided to assist operation and maintenance personnel in
locating 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 to
causes such as improper control settings or empty reservoirs. Any time a problem occurs, check first to see that all
controls are positioned correctly, that switches are correctly set and that liquids are at their proper levels.
Table 4-1. Troubleshooting
PROBLEM
POSSIBLE CAUSE
REMEDY
POWER TAKE-OFF
Clutch slipping
Out of adjustment
Adjust clutch.
Greasy/oily plates
Clean.
Clutch self-engages.
1.
Adjustment
Check and correct adjustment.
2.
Worn parts
Check linkage and release collar for
wear.
Clutch will not re-
Pilot bearing
Check for broken or frozen pilot bear-
lease
ing.
Excessive heat
Output shaft bearings
Check bearing adjustment and for over-
running hot.
supply of lubricant.
SUBDRIVE ASSEMBLY
Output shaft ro-
Stretched drive chain;
Replace drive chain.
tates unevenly
worn chain rollers; or
binding on sprockets.
Excessive noise
1.
Drive chain binding.
Replace drive chain and sprockets.
2.
Worn or burned
Replace bearings.
bearings.
4-1
