3-10 Operation 022-00028AE Operation and Maintenance Manual
7. Rotate starter key to "O" (OFF) position.
Remove key.
HYDRAULIC SYSTEM WARM-UP
1. Correct operating temperature of hydraulic oil is 50° - 80°C (120° - 175°F). Make sure to follow
procedures listed below for hydraulic fluid warm-up.
2. Run engine at idle (no load) for 5 minutes.
3. Run engine for approximately 5 minutes at middle of speed range, without a load.
4. Cycle bucket until bucket cylinder bottoms out (extended and retracted) without a load to circulate the
oil through the system. Do this for 5 minutes.
NOTE:
Do not allow cylinders to pass hydraulic oil over relief valve for more than twenty seconds
at a time.
5. Cycle boom, and bucket about five times without a load to circulate oil through system.
HYDRAULIC SYSTEM WARM-UP – COLD WEATHER
1. Follow Steps 1 through 3 in Hydraulic System Warm-up.
2. Do not operate machine at full speed until system has fully warmed up.
3. If working speeds continue to be slow, repeat initial hydraulic warm-up procedures again. If repeating
warm-up procedures does not improve working speeds, continue to operate, but use extreme caution
because machine function may be erratic.
HAOC342L
Figure 21
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