OP000756
Inspection, Maintenance and Adjustment
4-66
6.
Install hydraulic oil tank drain plug. Refill tank by pouring oil
in through breather cap opening. Install and tighten
breather cap.
7.
Start engine and operate controls to raise and lower bucket
a few times. (Figure 103). Raise and lower boom a few
times. (Figure 104). Lower bucket to ground.
8.
Check hydraulic oil tank sight gauge (Figure 17). Oil level
must be between upper limit and lower limit on sight
gauge. Remove breather cap and add oil if necessary.
Check Brake Accumulator
Test the brake accumulator for proper precharge of Nitrogen
gas:
1.
Park the machine on a level surface, apply the parking
brake, lower the attachment to the ground.
2.
Run the engine at low idle for five minutes to fill the brake
accumulator with oil.
3.
Shut down engine.
4.
Turn the starter switch to "ON" position.
5.
Count the number of times you can depress the right-hand
brake pedal before the brake warning light comes on.
6.
If the number counted is less than five (5), there is some
problem with the accumulator. Contact your nearest
DOOSAN
dealer.
Figure 103
Figure 104
WARNING!
Pressurized Nitrogen gas in brake accumulator may
explode causing serious injury or death.
Never service brake accumulator unless properly trained.
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