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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How To Repair The Hand Pump

          In the 90 's, China's electromechanical industry imported advanced assembly and fastening technology, the use of high-strength hydraulic nuts, hydraulic tensioner at the same time, as a power source synchronous introduction of ultra-high pressure manual hydraulic pump.Hand Pump

           First, in the maintenance from the following three points to find the cause of the failure, and improve the system: 1, check the internal leakage of the boom cylinder: The simplest way is to raise the boom to see if there is a clear drop in freedom. If the whereabouts are obvious, remove the cylinder check and the seal ring should be replaced if it has been found to be worn. 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. Measuring pressure of hydraulic pump:Hand Pump If the pressure is low, then the adjustment, add pressure is still not up, then the hydraulic pump serious wear.Hand Pump

          Second, the main reason for the failure of the movable arm belt is: 1, the hydraulic pump serious wear. In the low-speed operation of the pump leakage is serious; High speed operation, pump pressure slightly increased, but because of the pump wear and leakage, volume efficiency significantly reduced, it is difficult to reach 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. 2. The selection of hydraulic components is unreasonable. Dynamic arm cylinder size of 70/40 non-standard series, seals are not standard parts, high cost 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. 3. The design of hydraulic system is unreasonable. Figure 1 shows that the control valve and the full hydraulic steering gear for the single Pump series, the relief valve to adjust the pressure of 16MPa, and the hydraulic pump rated work 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


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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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