4-17
4.6
ABOUT USE OF BIO-OIL (BIODEGRADABLE
HYDRAULIC OIL)
4.6.1
GREASE AND OIL FOR USE
Regarding greases and oils for use, ask your KOBELCO authorized dealer.
4.6.2
PRECAUTIONS FOR BIO-OIL
• When charging bio-oil to a machine using conventional mineral oil, perform flushing three times. Without
flushing, the mineral oil in the circuit is not completely cleaned and the effect of biodegradability cannot be
expected.
• Because the friction coefficient of bio-oil is smaller than that of mineral oil, the performance of parking brakes for
swing and travel decrease.
4.6.3
REPLACEMENT INTERVAL OF BIO-OIL
Bio-oil should be replaced every 2,000 hours.
For replacing procedures, see ”CHANGING HYDRAULIC OIL" in Chapter 4.
4.6.4
FLUSHING PROCEDURES OF BIO-OIL
1.
Drain all mineral oil from the hydraulic oil tank.
2.
Drain all mineral oil from the cylinders.
3.
Charge new bio-oil in the hydraulic oil tank fully.
4.
After starting the engine, operate each cylinder for 10 strokes respectively.
Rapid operation may burn the seal because of the air remained in the cylinder. During the first 4 strokes, operate
the cylinder slowly with the engine speed at low idle to charge the hydraulic oil in the cylinder.
5.
Idle the right and left travel motors for about 3 minutes respectively.
6.
Perform the swing operation for 10 turns.
7.
Drain all bio-oil from the hydraulic oil tank.
8.
Drain all bio-oil from each cylinder.
9.
Charge new bio-oil in the hydraulic oil tank and repeat the procedures 4 to 9 twice.
10. In the final state, analyze the hydraulic oil and check the remaining amount of mineral oil.
Copyright©2020 Kobelco Construction Machinery Co.,Ltd. All rights reserved. [S2YY00041ZE03] [0701CsCshWbYs]