5-30
5. Replace the oil return filter element
The first replacement shall be carried out after
working for 2000 hours, and thereafter it shall be
done every 2000 hours. The oil return filter is in the
hydraulic oil tank, so:
1) Fully extend the piston rod of each hydraulic
cylinder, and then stop the engine.
2) Remove the oil tank bolt 1.
3) Screw out the filter element 6 and replace it with a
new oil return filter element (grease the sealing
washer before installation).
4) Start the engine and operate the excavating
mechanism.
5) Check the hydraulic oil level and replenish it if
necessary.
6) Retighten the screw plug and close the sight glass
cover.
7) In order to pressurize the hydraulic oil tank to
retract the piston rod of the hydraulic cylinder.
6. Replace the fuel filter element of pilot oil circuit
The first replacement shall be carried out after 1000 hours working for a new machine, and thereafter it shall
be done every 1000 hours.
Note: Be sure to discharge the air pressure in the hydraulic oil tank before removing the filter element.
1) Unscrew oil filter housing.
2) Remove the filter element.
3) Install the new O-ring in the filter head groove.
4) Before assembling the new filter element, apply a
layer of hydraulic oil on the sealing surface of the
filter element and install the filter element into the
filter head.
5) Clean the oil filter housing and soft magnet, and
be careful not to allow dirt, dust or water to enter the
oil filter housing.
6) Tighten the oil filter housing and filter head with a
torque of 25~35 N.m.
7) Connect the pipeline and start the engine slowly.
Operate continuously for 3-5 minutes to discharge
the air in the system.
8) Park the machine on the level ground, stop the
machine to check the oil level, and add oil if
necessary. Pay attention that the oil filling shall not
exceed the required maximum oil level limit.
Air filter (fuel filler port)
Oil return filter
Oil drain seat
Oil suction
filter
Hydraulic oil
dipstick
Filter head
O-ring
Filter element
Soft magnet
Oil filter housing
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...