2-26
Hydraulic system
1. Safety rules for high pressure oil
There is always pressure inside the hydraulic system.
When inspecting or replacing pipes or hoses, be sure to
check whether the pressure in the hydraulic oil circuit has
been released. If the oil circuit is still under pressure,
serious injury or damage will be caused, so follow these
regulations:
1)
Do not check or replace when there is pressure in the
hydraulic system.
2)
The surrounding area is wet if there is any leakage in
the pipe or hose. So check if the pipe or hose is
broken, and the hose is swollen. Wear goggles and
leather gloves when performing an inspection.
3)
The high pressure oil leaking from the small holes will
penetrate into the skin, and there will be a risk of
blindness if it directly touches the eyes. If you are
injured by high pressure oil hitting your skin or eyes,
rinse with clean water and contact your doctor for
treatment immediately.
2. Safe operation of high pressure hoses
If the high pressure hose leaks oil or fuel, it may cause a fire or operation failure, resulting in serious injury or damage. If
the bolts are found to be loose, stop the work and tighten the bolts to the specified torque. When welding the machine, it
is strictly forbidden to do it without isolating the hydraulic oil pipeline (hose). If any damage to the hose is found, stop the
operation immediately and get in touch with the Yuchai agent.
If the following problems are found, replace the hose:
1) Damaged or leaking hydraulic pipe joints;
2) The cladding is worn or broken, or the steel wire of the reinforcing layer is exposed;
3) The cladding swells in some places;
4) The movable part is twisted or crushed;
5) There are impurities in the cladding.
3. Safety rules for high pressure oil
The hydraulic oil that is not cooled during or after work is at high temperature and high pressure. To prevent scalding
caused by sprayed oil or contacting hot parts when checking or draining oil, wait until the oil cools to the temperature that
can touch the cover or plug before starting operation. Even if the oil has cooled, slowly loosen the cover or plug before
removing the cover or plug to drain the internal pressure.
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...