TM 5-3820-256-10Section VI. OPERATING UNDER UNUSUAL CONDITIONS2-20.Drilling Rig.a.ColdWeatherOperation.(1)Enginecoolant. Make sure the truck engine is filled with the proper engine coolant. Add anti-freezecoolant, NEVER WATER, as necessary.(2)Lubricationsystems. Change oil and lubricants with lubricants recommended for cold weatheroperation. Refer to the lubrication instructions in Chapter 3 for recommended lubricants.CAUTIONUse caution during entire warmup procedure. Run the truck engine at the slowest possible speed andactuate all controls slowly.(3)Hydraulicsystem.CAUTIONThe hydraulic oil provides lubrication to the hydraulic pump. When the oil in the suction line is too coldand stiff to flow easily, it cannot keep the pump inlet supplied with oil, thus cavitation occurs. If thiscondition continues for more than a few moments, serious damage may result.(a) To prevent cavitation, "jog" the PTO/hydraulic pump on and off by depressing and releasing theclutch until oil has warmed enough to permit adequate flow to the pump.(b) If jogging the pump for 10 minutes does not produce acceptable results, do not attempt to operatethe unit until the rig can be taken inside a heated enclosure and serviced for cold weatheroperation. Refer to the lubrication instructions in Chapter 3.(4)Waterinjection. Do not fill the water injection tank with water until just before you intend to use waterinjection. If necessary, use external heat or a small immersion heater to keep the water from freezing.After use, drain the water tank, pump, suction lines, and discharge lines. Also, drain the foam chemicalreservoir and its lines.(5)Mudcirculationsystem. After use, remove the drain plugs and drain the mud pump fluid end. Drain alldischarge lines, allowing all fluid to drain from the swivel and kelly hose. Under severely cold conditions, itmay be necessary to erect temporary shelter around the mud pits and use portable heaters to keep the mudabove freezing temperatures. Maintain circulation of the fluid as much as possible.2-88
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