4-4 Change 1
4-8. PMCS PROCEDURES (Continued)
TABLE 4-1. PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS)
Not Fully Mission
a. Test operation of pressure relief
Pressure relief valve does not
Relief Valve valve (Paragraph 4-12).
Section IV. UNIT TROUBLESHOOTING PROCEDURES
Unit troubleshooting is based on malfunctions or failures observed during operator PMCS (Chapter 2, Table
2-1), Unit PMCS (Table 4-1) or operational use of the HWR.
4-10 TROUBLESHOOTING INSTRUCTIONS FOR MODEL RAK-15
ELECTRIC SHOCK. Do not be misled by the term "low-voltage".
Whenever possible turn off and disconnect the HWR power supply
before performing any work. Potentials as low as 30 V dc can cause
severe electric shock or death under adverse conditions.
HIGH TEMPERATURES (1). Be aware that normal operating
temperatures within the HWR are up to 190 *F (88 'C) and can reach
higher temperatures under abnormal conditions. Use gloves or other
hand protection as necessary. Unprotected exposure to high
temperatures can cause serious burn injuries.
FIRST AID. Never work on the HWR unless there is another person
present who is competent in administering first aid. The absence of
first aid can result in serious personal injury or even death. Refer to
FM 21 -11 (First Aid for Soldiers) for appropriate first aid instructions.
DISASSEMBLY. Do not attempt disassembly beyond that which
is necessary for unit troubleshooting and maintenance.
Unauthorized disassembly can result in the HWR becoming
This troubleshooting flowchart describes typical malfunctions, which are most likely to occur when operating the
HWR. To use the flowchart, commence at the START function and check each set of fault conditions against
the observed malfunction. When matching fault conditions are identified, rectify the malfunction by following the
corrective action instructions in the order in which they appear.
The flowchart cannot contain all the malfunctions that may occur or all the corrective actions needed to rectify a
particular malfunction. If a particular malfunction cannot be identified, or is not cleared by the corrective actions,
notify your supervisor.