TM 9-6115-660-13&P Table 2-2.  Operator Preventive Maintenance Checks and Services - continued Location Item Interval Procedure Not Fully Mission No. Item to Capable if: Check/Service 42 During CONTROLS AND Observe the following indicators and ensure Frequency or AC INDICATORS they are operating properly voltmeter inoperative. COOLANT TEMP. 170-200°F (77-930C) OIL PRESSURE.    25-60 psi (172- 414 kPa) FREQUENCY 60 Hz (AN/MJQ-37, PU-798, and PU-798A); 400 Hz (AN/MJQ-38, PU-799, and PU-799A) VOLTAGE 120-240 Vac 43 During GROUND ROD Inspect ground rod and cable for loose Cable is missing CABLE AND connections, breaks, damage and corrosion or damaged. CONNECTIONS 44 After HOUSING a.  Check doors, panels, hinges, and clamping Cannot secure catches for damaged, loose, or corroded doors. items. b    Inspect air intake and exhaust grills for debris. 45 After IDENTIFICATION Check to ensure identification plates are PLATES secure. 46 After SKID BASE Inspect skid base for cracks and corrosion Skid base is cracked or shows signs of structural damage. 47 After ENGINE Check for loose, damaged, or missing ASSEMBLY hardware. 48 After FUEL SYSTEM Inspect fuel system for leaks, and damaged, Any fuel leaks, loose, or missing hardware and damaged, loose, or missing parts. WARNING The fuels used in this generator set are highly explosive.  Do not smoke or use open flame when performing maintenance Flames and explosion can occur resulting in severe injury or death. Change 2  2-25