TM 5-3820-245-14&P
4-5
PREVENTIVE MAINTENANCE (Continued)
will be in storage. When the digger is in continual, daily use, a program of daily service requirements should be
established with preventive maintenance being performed on a "before operation;" "during operation;" and "after
operation" schedule.
4-6
COOLING SYSTEM MAINTENANCE
The engine's cooling system is designed to provide adequate cooling during all normal operating conditions.
Engine over-heating can become the primary cause for extensive repair work, lost operating time, and possibly
result in the eventual and complete engine and/or transmission failure. Cooling system maintenance should,
therefore, hold an important place in the digger maintenance program.
4-7
COOLING SYSTEM FREEZE PROTECTION
In the late fall, before temperatures drop below 32F, the complete cooling system should be drained and
flushed. The thermostat should be removed during flushing. Check for proper operation or replace before
reinstalling. When refilling, add a sufficient amount of antifreeze for your climate. A 50-50 mixture is
recommended for maximum protection.
4-8
DRY-TYPE AIR CLEANER
Under normal conditions, dry-type filters should be serviced each 500 hours of operation. Extreme conditions
will require daily service. Element can be cleaned best by blowing compressed air from inside out. Do not apply
air closer than 2 inches and do not use more than 30 pounds pressure. Do not damage gasket surface or bend
element. Cleaning can only be done a few times as the element will finally clog and restrict air flow. The
element must then be replaced.
4-9
ELECTRICAL SYSTEM
So far as electrical system maintenance is concerned, the operator's primary responsibility is restricted to making
sure the wiring remains in good condition and the battery is filled and kept charged. Repair and replacement of
worn or damaged parts must be done according to the maintenance allocation.
4-10
TRANSMISSION
This unit requires very little preventive maintenance. The clutches are self-adjusting and pressure is internally
regulated. Before operation, the operator should start the engine and run for two minutes and stop engine and
check oil level. Add if necessary, using automotive automatic transmission fluid - MIL-L-2104 only. Do not over
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