Hydraulic pump failure reason-hydraulic tools
(1) check the leakage of the boom cylinder. The easiest way is to raise the boom to see if there is a clear free fall. If the whereabouts of the obvious removal of oil cylinder inspection, such as the wear ring should be replaced.
(2) check valve. First clean the safety valve, check whether the valve wear, such as wear should be replaced. After the installation of the safety valve, if there is no change, and then check the control valve spool wear, the gap is generally limited to the use of 0.06mm, severe wear should be replaced.
(3) measuring the pressure of hydraulic pump. If the pressure is low, then the adjustment, plus the pressure is still not up, indicating the serious wear of hydraulic pumps.
In general, the main reason for the failure of the boom is that:
A. hydraulic pump serious wear. In the low-speed operation of the pump leakage is serious; high speed operation, the pump pressure slightly increased, but because of the pump wear and internal discharge, volumetric efficiency decreased significantly, it is difficult to achieve the rated pressure. The hydraulic pump for working for a long time and wear, the temperature, the resulting wear of hydraulic components and seals of aging, damage, loss of sealing capacity, hydraulic oil deterioration, resulting in failure.
B. hydraulic components selection is not reasonable. The specification of the arm cylinder is 70 / 40 non-standard series, and the sealing parts are also non-standard parts. Boom cylinder bore small, is bound to make the adjustment for high pressure system.
C. hydraulic system design is not reasonable. Control valve and hydraulic steering gear for a single pump in series, the safety valve set pressure 16MPa, and the rated operating pressure of hydraulic pump is also 16MPa. The hydraulic pump is often at full load or overload for a long time (high pressure) case, and system hydraulic impact, long-term oil, hydraulic oil pollution, increased pump wear, so pump pump shell burst (after he was found such failure).
2, improvement and effect
(L) improved hydraulic system design. After a number of arguments, and finally the use of advanced priority valve and load sensing hydraulic steering mode, see figure 2. The new system will shift in accordance with the requirements, give priority to the distribution of traffic, regardless of load size, the level of the steering wheel speed can ensure adequate supply, the rest can all work equipment supply circuit, thereby eliminating the loop due to the excess oil as losses, improve system efficiency and reduce the work pressure of hydraulic pump.
(2) optimize the design of the boom cylinder and hydraulic pump to reduce the working pressure of the system. Through optimization calculation, the arm cylinder adopts standard series 80 / 4. The displacement of the hydraulic pump is increased from 10ml/r to 14ml/r, and the setting pressure of the system is 14MPa, which meets the requirements of lift and speed of the boom cylinder.
(3) in the use of the process should also pay attention to the correct use and maintenance of the loader, regularly add or replace hydraulic oil, to maintain the cleanliness of hydraulic oil, strengthen routine inspection and maintenance.
YUHUAN SITUTE(SITOOT) TOOLS CO.,LTD.
Add:BinGang Industrial Zone,Yuhuan County,Taizhou City,Zhejiang Province,China
Tel:0086-576-87229709
Fax:0086-576-87296000
E-mail:sitoot@sitoot.com
sitoot@126.com
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