5-29
D. Discharge the air in the rotary motor (when the oil in the housing of the rotary motor is discharged)
Note: During the exhaust, the machine cannot be rotated under any circumstances.
1) Run the engine at idle speed, loosen the exhaust plug, and check whether the oil flows out from the exhaust
plug.
2) If there is no oil flowing out, remove the exhaust plug and fill the motor housing with hydraulic oil.
3) After the exhaust is completed, tighten the exhaust plug.
4) Finally, run the engine at a low idle speed and slowly turn the upper part of the car body left and right at
least twice. So that the air is completely discharged.
Note: If the air in the motor is not discharged, the bearings of the rotary motor may be damaged.
E. Discharge the air in the walking motor (when the oil in the casing of the walking motor is
discharged)
1) Run the engine at idle speed and loosen the
exhaust plug. If oil comes out, tighten the screw
plug.
2) Run the engine at idling speed and rotate the
working device in 90 degree so that it is located on
the side of the track. (As shown on the right)
3) Jack up the machine with the working device,
keep the track on one side slightly away from the
ground, and rotate the track for 2 minutes under no
load. Repeat this action on the left and right tracks
and rotate the tracks forward and backward equally.
F. Discharge the air in the accessories
If the accessory is installed, run the engine at idle speed and operate the accessory pedal several times (about
10 times) until the air is discharged from the accessory oil circuit.
Note:
1. If the manufacturer specifies a specific exhaust method, which shall be followed strictly.
2. After the exhaust operation is completed, turn off the engine and let the machine stand for at least 5
minutes before starting operation to eliminate air bubbles in the oil in the hydraulic cylinder.
3. There shall be no leakage during the inspection. Wipe the spilled oil if any.
4. After the exhaust operation is completed, check the oil level, and fill it if the oil level is low.
Summary of Contents for U27
Page 1: ...U27Hydraulic Excavator Instruction Manual Guangxi Yuchai Heavy Industry Co Ltd...
Page 5: ...1 1 Preface...
Page 17: ...2 1 Safety regulations...
Page 44: ...3 1 Parts introduction...
Page 49: ...3 6 Panel meter Oil level pointer Timing display Water temperature pointer Indicator area...
Page 55: ...4 1 Operation guide...
Page 89: ...5 1 Maintenance...
Page 130: ...6 1 Accessories guide...