TM 5-2420-232-10
0006
PREPARATION OF HYDRAULIC SYSTEM FOR OPERATION IN
EXTREME COLD WEATHER 32 TO -25F (0 TO -31C)
0006
Before operating the hydraulic system in extreme cold weather conditions, +32 to -4F (0 to -20C), perform the following
procedures:
1. Start the engine (WP 0005).
2.
Close all doors and windows and operate cab heater (WP 0004).
CAUTION
In cold start conditions of below +32 to -4F (0 to -20C), avoid running the engine above 1,000
rpm or operation of the hydraulic system during the first 3 minutes after start up. This will avoid
possible damage to the hydraulic system.
3.
Slowly operate all hydraulic systems control levers to warm the hydraulic oil (WP 0004). Cycle each control lever several
times. Normal warm-up period is 3 to 10 minutes.
4.
Operate under light load for first 5 minutes of operation.
END OF TASK
EXTREME HOT WEATHER OPERATION
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WARNING
Machine operation in hot weather can increase the risk of heat stress to the operator. Follow
individual preventative medicine measures in FM 4-25.11 to reduce the risk of heat stress in the
HMEE-I. Failure to follow this warning may result in injury or death to personnel.
CAUTION
Failure to follow the following step may result in damage to equipment.
The machine may overheat during long, hard loading/excavating operations or when driving at high speed. Check the temper-
ature gauge and warning lights often. Allow the engine to recover at idle speed. If the temperature does not reduce or if the
warning buzzers continue to operate, shut down the engine. Keep the ventilation cooling system on during operation. Inspect
the air cleaner and coolers often. Inspect the cooling pack and clean as necessary (WP 0019). Have Field Maintenance add
tropical electrolyte to the batteries.
Operation of Hydraulic System
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CAUTION
Failure to follow the following step may result in damage to equipment.
In hot weather and during continuous operation, the hydraulic system may generate more heat than can be removed by the
hydraulic cooler. If the hydraulic temperature gauge rises to the red section or the high hydraulic temperature warning buzzer
sounds, stop the engine as soon as possible (WP 0004). Notify Field Maintenance.
Change 1
0006-12
