252101868 rear chassis for XCMG ZL50G/ZL50GL Wheel Loader

product parameters

- Product Name: Rear Frame
- Part No.: 252101868
- Applicable Model: XCMG ZL50G, ZL50GL wheel loader
- Main Material: High-strength low-alloy structural steel plate
- Forming Process: Plate cutting, bending forming, automatic robot welding
- Post-welding Treatment: Stress relief annealing, weld seam UT ultrasonic flaw detection
- Surface Treatment: Sand blasting + anti-rust primer spraying
- Assembly Matching: Match front frame, upper & lower articulation pin, drive axle, engine support, counterweight bracket
- Welding Standard: Follow XCMG original factory welding technical specification
- Overall Dimensional Tolerance: Controlled within original drawing tolerance range
- Storage Requirement: Dry indoor stacking, avoid long-term outdoor rain soaking, support anti-deformation placement

▪ Adopt high-strength low-alloy steel as raw material, with good toughness and fatigue resistance. It can withstand long-term alternating torsion and impact, not easy to crack or deform under heavy load and bumpy working conditions.
▪ Automatic robotic welding with stable weld forming, uniform penetration. Weld seam is inspected by ultrasonic flaw detection to eliminate internal defects such as slag inclusion and air hole, guaranteeing welding reliability.
▪ Stress relief treatment after welding effectively releases internal welding stress, greatly reducing the risk of slow deformation and cracking in later service, and improving the long-term stability of the frame.
▪ Strictly copy the original drawing structure, all mounting holes, hinge lug positions and connection dimensions are consistent with original parts. Each assembly can be directly installed without cutting, welding or hole expansion modification.
▪ Complete surface sandblasting and primer anti-corrosion treatment, remove surface oxide scale, improve coating adhesion, slow down rust corrosion during storage and use, extend service cycle.

FAQ 

Q1: What is the main function of the rear frame?
A1: It is the rear load-bearing base of the loader, used to install engine, transmission, rear axle and counterweight, and form the whole machine hinge structure together with the front frame to bear driving and working loads.

Q2: What signs indicate that the rear frame needs to be replaced?
A2: Visible main weld cracking, permanent bending deformation, seriously torn hinge lug seat, multiple repair failures, out-of-tolerance installation hole position which cannot be aligned normally.

Q3: Can this rear frame be used on other loader models?
A3: It is specially matched for ZL50G and ZL50GL. Do not install it on other models without confirming the drawing and assembly structure.

Q4: What should be paid attention to during installation?
A4: Check all matching hinge parts and installation supports before assembly; ensure the hinge center distance is correct; tighten connecting bolts according to torque requirements, and check the gap after assembly.

Q5: Can we repair the cracked frame instead of replacing it?
A5: Minor surface cracks can be repaired by professional welding. If the main force-bearing weld or lug seat is severely cracked and deformed, replacement is recommended to avoid safety risks.

Q6: What are the common causes of frame cracking and deformation?
A6: Long-term overload operation, violent impact during shoveling hard materials, poor road conditions, untimely inspection of hinge clearance leading to abnormal stress concentration.