TM 5-2420-232-10
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EXTREME COLD WEATHER OPERATION +32 TO -25F (0 TO -31C) CONTINUED
Maintenance - Continued
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CAUTION
Care must be taken when cleaning the hydraulic cylinder chrome piston rods. Do not use abrasive
materials of any kind on the chrome piston rods. Clean only with a soft brush or soft cloth. Failure
to follow this caution could result in damage to equipment.
Hydraulic Cylinder Chrome Piston Rods.
Clean snow, ice, and mud from the cylinders before it freezes. Report any signs of corrosion to Field Maintenance.
Plastic and Rubber Parts.
Any parts made of plastic or rubber material must be handled carefully. These become brittle in cold weather and may
break due to vibration or handling. To prevent insulation from cracking and causing short circuits, warm plastic or rubber
insulation before bending and be sure all cables are secure in the machine.
Shutdown in Temperatures Below +32F (0C)
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1.
If a machine is to be switched off for extended periods at temperatures below 32F (0C), it is advisable the suspension
should be set in transport mode (lowered) (WP 0004).
2.
The machine should be parked on level ground.
END OF TASK
COLD START GENERAL PROCEDURES
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Ensure Field Maintenance has installed the proper grade of oil in the engine, transmission, and hydraulic systems. Field Main-
tenance should flush out and refill the oil reservoirs prior to operating under extreme cold weather conditions.
In extreme cold weather, the engine electronic control system modifies the normal engine startup in the following ways:
1. The system will automatically increase the engine idle speed from 750 rpm to 900 rpm until the engine coolant tempera-
ture reaches +32F (0C), at which point it will revert to 750 rpm.
2.
The engine will not accelerate above 900 rpm until the engine oil pressure has stabilized at the required level.
3.
Allow grid heaters to operate as controlled by engine ECU.
4.
If the engine has not started after 30 seconds cranking or cranking speed drops noticeably, release the starter key and key
back on to initialize grid heaters - unless operator deems engine is about to start. Wait 2 minutes before cranking again.
NOTE
Engine block heater is piped up to bypass the cab heater, therefore cab heater control is OFF.
Start defined as successful when normal throttle operation achieved.
5.
After each successful start, run engine for at least 10 minutes to prevent internal condensation.
END OF TASK
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