252101217 oil return block for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

Part Number：252101217
Product Name：Oil Return Block
Applicable Model：XCMG ZL50G, ZL50GL Wheel Loader
Material：High strength cast alloy
Rated working pressure：OEM standard back pressure
Matching accessories：Return filter seat, sealing gasket, threaded pipe joint
Medium：L-HM46 anti-wear hydraulic oil
Working temperature：-20℃ ~ 80℃, suitable for all-season outdoor construction
Connection form：Bolt fixed installation, matched with oil return hose and hydraulic tank
Inspection Items：Pressure test, leakage test, dimension inspection, flaw detection, flow test

Application Scenarios

It is used for return oil confluence and filtering transition of hydraulic system of 5-ton wheel loaders, suitable for earthwork, quarry mining, sand yard and bulk cargo loading high-intensity working conditions.

• Integral casting and precision machining structure, compact layout, smooth internal flow channel, low flow resistance, effectively suppress return oil turbulence and pressure fluctuation, stable back pressure of oil return circuit.
• High-strength alloy base material, good rigidity, resistant to vibration and impact, not easy to deform under long-time cyclic hydraulic impact, anti-fatigue performance outstanding.
• Multi-port integrated design, realize multi-way oil confluence in a small space, simplify the pipeline layout, reduce the number of intermediate joints, and lower the risk of oil leakage at pipeline joints.
• Standard interface design, compatible with original return filter elements, sealing gaskets and return hose assemblies, convenient for spare parts stocking and quick on-site replacement.
• Surface anti-corrosion treatment, resist mud splash and rust, adapt to dusty, humid outdoor construction environment, stable performance for long-term continuous operation.

FAQ 

Q1: Can this oil return block work under pressure exceeding the rated back pressure for a long time?
A1: No. Long-term overpressure will cause deformation of the block body, seal extrusion failure, serious oil leakage, and even crack the casting body, bringing safety risks to the whole hydraulic system.

Q2: What are the common causes of oil leakage of the oil return block?
A2: It may be loose fastening bolts, aging and damage of sealing gaskets, thread joint wear, casting body cracks caused by heavy impact, or mismatched installation surface leading to uneven compression of seals.

Q3: What should be noticed before installation?
A3: Clean the internal oil passage and fitting surface to remove casting sand, debris and dirt; check all gaskets and threaded joints intact; tighten the bolts crosswise and evenly to avoid local stress concentration.

Q4: Can a slightly cracked return block be welded and reused?
A4: It is not recommended. Welding will change the internal stress of the casting alloy, new cracks are easy to generate under hydraulic shock, and leakage will occur again under pressure. It is safer to replace the entire oil return block assembly.

Q5: What are the requirements for the hydraulic oil matched with this return block?
A5: It is recommended to use L-HM46 anti-wear hydraulic oil. Dirty, deteriorated or water-emulsified oil contains hard particles, which will scratch the inner flow channel and accelerate the wear of filter elements and hydraulic components.

Q6: What will happen if the oil passage of the return block is blocked?
A6: Blocked flow channel will cause return oil back pressure to rise sharply, oil return not smooth, the hydraulic cylinder action becomes slow and weak, and the filter element is easily damaged by high back pressure.