Table 4-1. Organizational Preventive Maintenance Checks and Services - Continued
Q - Quarterly
Total man-hours required:
ITEM TO BE INSPECTED
ENGINE FUEL FILTER
Replace engine fuel filter every 100 hours of operation (figure 3-8).
Check for worn, frayed, or broken drive belt. Check tension of belt (figure 3-9). Tighten drive belt as
The 6TN and/or the 6TL batteries will perform properly in hot weather as long as electrolyte
levels are carefully monitored. If the electrolyte expands and causes the level to rise, some
fluid must be removed. If the level becomes too low due to evaporation, distilled water may
be used to obtain the proper level. A good grade of drinking water(excluding mineral
waters) may be used if distilled water is not available .
and should be used in these batteries. Do NOT adjust the electrolyte in wet batteries to a
lower specific gravity.
Check battery cable connections and mounting (figure 3-10). Check filler cap vent holes, electrolyte
level and specific gravity. Clean and lubricate battery terminals (figure 3-18).
SPEED CONTROL LINKAGE
Check speed control linkage for freedom of movement (figure 3-11). Clean and lubricate the linkage
to Direct or General Support maintenance.
Check restriction indicators in instrument panel (figure 2-3). Remove element and clean cup assembly
CONTROLS AND INSTRUMENTS
Check operation of instrument panel lamp. Replace a defective bulb (figure 3-13). Check for any
damaged control cables and for loose mounting (figure 4-7). Check gauges for proper operation. Normal
Restriction indicators: Normally green; red when air cleaners are restricted. Receiver pressure
gauge: 80 PSI load (5.6 kPa) - 105 PSI unload (7.4 kPa)
Engine water temperature gauge: 160F to 190F (71C to 88C)
Engine oil pressure gauge: 15 to 25 PSI idle (1.1 to 1.8 kPa) 40 to 60 PSI full load(2.8 to 4.2 kPa)
Fuel pressure gauge: 3 to 5 PSI (0.2 to 0.4 kPa)
Compressor oil temperature gauge: 1700 to 220F (770 to 1040C)
Tachometer-hourmeter: 1100 rpm idle; 2200 rpm full load.
QUICK START ASSEMBLY
Remove the fuel cylinder (figure 3-14 and 3-22). Weigh the cylinder to determine amount of fuel
remaining. A full cylinder weighs 35 ounces (992.25 grams). An empty cylinder weighs 17 ounces
481.95 grams). The actuating valve is a measured shot of 2 1/2 cc per shot. Calculate remaining shots
in the cylinder [15.6 shots (or 39 cc) per ounce (28.35 grams) of weight]. Replace the fuel cylinder
when 95% used, or when the cylinder weighs approximately 18 ounces 510.27 grams). Install new
Check engine mounting for tightness.
Check fuel injection pump and fuel injection nozzles for proper operation. Notify Direct and General
Support Maintenance personnel of engine malfunctions.
Check fur uneven running and excessive vibration. Check for noisy operation. Notify Direct and
General Support Maintenance personnel of any compressor malfunction
Change 2 4-5