5-26
Hydraulic system
Maintenance instruction
Hydraulic oil tank capacity ......................................................................................................................... 25 liters
Check the oil level ...................................................................................................................................... every 10 hours
Change filter element ................................................................................................................................. every 2000 hours
Change the hydraulic oil ............................................................................................................................ every 2000 hours
Check the system pressure ....................................................................................................................... every 400 hours
Warning: If hydraulic oil or grease is injected into the skin, which may cause serious injury and
death. To prevent your hands or body from approaching the pressure oil leakage area. Cardboard or
paper shall be used to check for leaks. If hydraulic oil is accidentally injected into the skin, go to the
hospital for treatment immediately.
Warning: To avoid scalding, maintenance shall only be carried out after the hydraulic oil has cooled
down or the oil is cold before daily work.
During removing the oil filler flange cover, in order to prevent the oil from spraying out, slowly turn
the cover to release the internal pressure.
1. Check the oil level in the hydraulic oil tank
Check the oil level of the hydraulic oil tank every 10 hours.
1) Park the machine on a level surface.
2) Start the engine to make each cylinder reciprocate.
3) Retract the stick cylinder, extend the bucket cylinder,
and then the bucket falls to the ground, the bulldozer
shovel shall be placed on the ground and shut down. As
the figure shows.
4) Observe the hydraulic oil level through the oil gauge
tube on the hydraulic oil tank.
The level of the hydraulic oil shall be observed through
the oil gauge hole.
The hydraulic oil level shall be clearly seen on the oil
gauge, and the oil shall not be filled over much, otherwise
the level can not be seen the oil gauge tube. Since this
may cause damage to the hydraulic oil circuit or injection
of oil. If the refueling is too full, stop the engine and drain
the excess oil from the oil drain plug after the oil cools. If
the oil gauge shows that the liquid level is too low or the
liquid level is not visible, oil shall be refilled in time through
the oil filler port on the top of the hydraulic oil tank.
Note: The hydraulic oil level will change with the increase of oil temperature during operation. Before
operation, the oil level shall be in the middle of the oil gauge tube. During normal operation, the oil
temperature will rise, and the oil level will be closer to the upper end of the oil gauge tube.
Open the upper
right cover
Air filter (fuel
filler port)
Hydraulic oil
tank
Hydraulic oil
level observation
Fuel tank
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...