CORE-OCLR-YM 3744720 - Caterpillar

Keep the engine speed slow until the indicator light for the engine oil pressure goes out.If the light does not go out within ten seconds, stop the engine and investigate the cause before starting the engine again. Failure to correct the problem can cause engine damage.
Allow the engine to warm up at low idle.
Look at the indicators and the gauges frequently during operation.Note: During extreme cold conditions, the alert indicator for the hydraulic oil filter bypass may come on. As the hydraulic oil warms up, the alert indicator should go out.Also, in order to help the hydraulic oil to warm up, hold the bulldozer blade control lever in the LIFT position for periods of ten seconds or less. This will allow the hydraulic oil to reach relief pressure, which causes the hydraulic oil to warm up more rapidly.Cycle all controls in order to allow warm hydraulic oil to circulate through all hydraulic cylinders and through all hydraulic lines.When you idle the machine for warm-up, observe the following recommendations:
If the temperature is greater than 0°C (32°F), warm up the engine for approximately 5 minutes.
If the temperature is less than 0°C (32°F), warm up the engine for approximately 15 minutes.
If the temperature is less than - 18°C (0°F) or if hydraulic functions are sluggish, additional time may be required.