BOLT 1C3803 - Caterpillar

The hydraulic activation control lever must be in the UNLOCKED position, before the hydraulic controls will function.1. Allow the engine to warm up at LOW IDLE for at least five minutes. Engage and disengage the implement controls to help speed warm up of hydraulic components.When idling the engine for warm-up, observe the following recommendations:* In temperatures above 0°C (32°F), warm-up requires approximately 15 minutes.* In temperatures below 0°C (32°F), warm-up requires approximately 30 minutes.* In temperatures below -18°C (0°F) or if hydraulic functions are sluggish, more time may be required.
The hydraulic control valve may become overheated if the bucket is operated continuously under relief conditions.Operate the control valve for 10 to 15 seconds and then return the control lever to the HOLD position for five to ten seconds.
2. To warm up the hydraulic oil, turn the engine throttle switch to medium engine speed. Run the engine for about five minutes while intermittently modulating the bucket control lever with the bucket stalled (cylinder fully extended).3. Turn the engine throttle switch to the maximum engine speed. Run the engine for an additional five minutes while intermittently modulating the bucket control lever.This allows the oil to warm more rapidly.Cycle all controls to allow warm oil to circulate through all cylinders and lines.4. Observe the gauges and indicators frequently during the operation.