4-7. INTRODUCTION TO PMCS TABLE-Continued.
It is necessary for you to know how fluid leakage affects your equipment. The following classification
system defines three types of leaks you may encounter while doing PMCS. Become familiar with the
system so that you can determine readiness status of your hydraulic impact wrench.
Class I leak-Seepage of fluid (indicated by wetness or discoloration) not great enough to form drops.
Class II leak-Leakage of fluid great enough to form drops, but not enough to cause drops to drip from
item being checked or inspected.
Class Ill leak-Leakage of fluid great enough to form drops that fall from item being checked or
Equipment operation is allowable with minor leakage (class I or
class II). Of course, consideration must be given to fluid
capacity in item or system being checked or inspected. When
in doubt, notify your supervisor. When operating with class I
or class II leaks, continue to check fluid levels as required in
your PMCS to prevent damage to equipment.
Class III leaks should be reported to your supervisor.
Table 4-1. UNIT MAINTENANCE PMCS.
Perform operator PMCS listed in table 2-1 of
Service impact head in accordance with
Section IV. UNIT MAINTENANCE TROUBLESHOOTING PROCEDURES
4-8. INTRODUCTION FOR UNIT MAINTENANCE TROUBLESHOOTING.
The following table lists common malfunctions which you may find during the operation or maintenance of the
hydraulic impact wrench or its components. Perform tests/inspections and corrective actions in the order listed.
This manual cannot list all malfunctions that may occur, nor all tests, inspections, and corrective actions. If a
malfunction is not listed, or is not corrected by listed corrective actions, notify your supervisor.
Before you use this troubleshooting table, ensure you have performed all applicable operating
checks in Chapter 2.