Hangzhou WREN Hydraulic Equipment Manufacturing Co.,Ltd


1.Company in USA :
American Torque Wrench, Inc
803 Summer Park Drive Suit 150 Stafford, Texas 77477, USA
P:+1-713 581 8904
CELL: +1-281 707 6545
E: info@wrenchina.com

2.Factory in China:
Hangzhou WREN Hydraulic Equipment Manufacturing Co.,Ltd
No.24, Xingxing Road, Xingqiao, Yuhang, Hangzhou, China
P: +86-571-88115720
F: +86-571-88110210
E: info@wrenchina.com

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Maintenance Of Ultra High Pressure Manual Hand Pump

              Failure phenomenon and cause analysis of ultra high Pressure manual pump: Find the cause of the failure from three points below, and improve the system: (1) Check the internal leakage of the oil cylinder of the movable arm. The easiest way to do this is to raise the arm to see if there is a noticeable drop in freedom. If the whereabouts of the obvious removal of ultra-high pressure manual pump cylinder inspection, seal ring if worn should be replaced. (2) Check the control valve. First cleaning safety valve, check whether the valve core wear, such as wear should be replaced. If the safety valve is not changed after installation, then check the control valve spool wear condition, its clearance use limit is generally 0. 06mm, wear seriously should be replaced. (3) measure the pressure of ultra-high pressure manual pump. If the pressure is low, then the adjustment, add pressure is still not up, then the hydraulic pump serious wear. In general, the main reasons for the inability to lift the movable arm belt are:Hand Pump

              A. The hydraulic pump is badly worn. In the low-speed operation of the pump leakage is serious; high-speed operation, ultra-high pressure manual pump slightly improve, but because of the pump wear and leakage, volume efficiency significantly reduced, difficult to achieve the rated pressure. Long-time hydraulic pump work and increased wear, oil temperature rise, resulting in hydraulic components wear and sealing parts of aging, damage, loss of sealing capacity, hydraulic oil deterioration, and finally lead to failure. b. The selection of hydraulic components is unreasonable. Dynamic ARM cylinder specifications for 70/40 non-standard series, seals are not standard parts, high manufacturing costs and inconvenience of sealing parts replacement. The cylinder diameter of the movable arm oil cylinder is small, which will make the system adjust the pressure high. C. The design of hydraulic system of ultra high pressure manual pump is unreasonable. Control valve and full hydraulic steering gear for single Pump series, the relief valve to adjust the pressure of 16MPa, and the hydraulic pump rated working pressure is 16MPa. Hydraulic pump often in full load or long time overload (high pressure), and the system has a hydraulic impact, long-term oil, hydraulic oil pollution, aggravate the hydraulic pump wear, so that the hydraulic pump shell burst (after the failure of this type).Hand Pump

             Improvement and effect of ultra-high pressure manual pump (l) improving hydraulic system design. After many arguments, the final use of advanced priority valve and load sensing fully hydraulic steering gear, the new system can be in accordance with the steering requirements, priority to its distribution of traffic, regardless of the load size, steering wheel speed can ensure adequate supply of oil, the rest can be fully supplied with the working device circuit, thus eliminating the steering circuit due to excessive oil and power loss, improve the system efficiency, reduce the ultra-high pressure manual pump work pressure. (2) Optimize the design of the movable arm oil cylinder and ultra-high pressure manual pump, reduce the system working pressure. Through the optimization calculation, the movable arm cylinder adopts standard series 80/4. The displacement of ultra-high pressure manual pump is increased from 10ml/r to 14ML/R, and the system pressure is 14MPa, which satisfies the lift and speed requirement of the dynamic arm oil cylinder. (3) in the use of the process should also pay attention to the correct use and maintenance of loaders, regularly add or replace hydraulic oil, maintain the cleanliness of hydraulic oil, strengthen the ultra-high pressure manual pump daily inspection and maintenance.Hand Pump


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Address: No.24, Xingxing Road, Xingqiao, Yuhang, Hangzhou, China
Tel: +86-571-88115720
Fax: +86-571-88110210
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