Troubleshooting procedures are grouped by system, containing information you need to locate malfunctions on the
621B Scraper. A troubleshooting symptom index in WP 0011 00 is provided to aid in locating a malfunction or symp-
tom and direct you to the appropriate troubleshooting prodecure in WP 0012 00.
The troubleshooting table contains a listing of malfunctions, test and inspection procedures, and corrective actions. The
corrective action column further directs you to the required corrective maintenance procedure within this manual by
work package number. However, if the required maintenance procedure is beyond Operator level capabilities, the direc-
tion is to notify Unit Maintenance.
PRELIMINARY TROUBLESHOOTING PROCEDURES
Fluid leaks are classified as either Class I, Class II or Class III.
Seepage of fluid (as indicated by wetness or discoloration) not great enough to form drops.
Leakage of fluid great enough to form drops, but not enough to cause drops to drip from item
Leakage of fluid great enough to form drops that fall from item being checked/inspected.
Before starting any specific troubleshooting procedures, perform the following:
Visually check for ruptured oil hoses or tubes and for Class II or Class III leaks.
Check for mechanical jamming or binding caused by rocks or other foreign matter.
Analyze the symptoms and conditions and use common sense and logic to determine the most likely cause for the prob-
lem, then troubleshoot that circuit first. The more information you have concerning the problem, the easier it will be to
Isolate to the subsystem level (in cases where more than one subsystem is involved); next isolate the problem to a single
circuit within the subsystem; then, isolate the problem to the faulty component using the troubleshooting symptom index
Frayed, broken, loose or corroded wiring is a common source of problems in any electrical circuit. Always perform a
visual inspection before starting detailed troubleshooting. Observe in particular contacts to ground. Components with
case grounds are especially troublesome.
END OF WORK PACKAGE