402236 is recorded as an O-ring for an XCMG loader sealing position. Small seals are easy to overlook, yet an incorrect cross-section, damaged groove or incompatible elastomer can cause repeated leakage, pressure loss or contamination. The part number is the starting point; the installed location and working conditions complete the match.
Identify the Sealing Position Before Ordering
| Part number | 402236 |
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| Product type | O-ring |
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| Recorded application | XCMG loader assembly; confirm the exact installed position |
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| Critical checks | Groove diameter and width, seal cross-section, mating surface, pressure direction, working fluid and temperature exposure |
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Send a photo that shows where the ring is installed, not only a loose used seal. A removed O-ring can stretch, flatten or swell, so its measured dimensions may no longer represent the original specification. If available, include the assembly part number and machine serial number.
Why O-Rings Fail More Than Once
A fresh ring will not solve a cut groove edge, corroded sealing face, excessive clearance or incorrect alignment. Examine the old seal pattern. A clean slice can indicate installation damage; flattened or extruded material can point to clearance or pressure issues; swelling or unusual softness can suggest fluid incompatibility; and a hardened surface may reflect heat or ageing.
The material, hardness and exact dimensions of 402236 are not stated on this page. Confirm these properties from verified documentation or by matching an unused reference. Colour alone is not a reliable material identifier.
Installation Practices That Protect the Seal
Release system pressure and clean the assembly before opening it.
Remove the old ring without scratching the groove or sealing face.
Inspect the groove for burrs, contamination, corrosion and sharp edges.
Confirm that the replacement ring sits naturally without twist, excessive stretch or loose clearance.
Use only a lubricant compatible with the specified working fluid and seal material.
Protect the ring while it passes threads, splines or ports.
Reassemble evenly and check the joint under a controlled pressure test.
Never reuse an O-ring that has been compressed in service. If the joint also uses a back-up ring, washer or shaped seal, confirm the order and orientation of every component.
Use the Leak Location to Guide Diagnosis
An external leak may come from the O-ring joint, but oil can travel along a housing and appear away from its source. Clean the area, run the function under the specified condition and identify the first wet point. Internal leakage requires circuit testing because the seal may be only one part of the pressure path.
Related XCMG Loader Parts
Seal diagnosis may connect with the XCMG pressure reducing valve YJ320-01000Z, the XCMG loader gear pump 403601-608 and the XCMG loader seal 75700439. These pages support parts identification; they do not confirm compatibility with 402236 or inclusion in the same order.
Frequently Asked Questions
Can I identify O-ring 402236 from the old ring dimensions?
Measurements help, but a used ring may be deformed. Combine the part number, assembly location, groove dimensions and machine serial number.
What material is O-ring 402236?
No verified elastomer specification is published here. Confirm material and hardness for the actual fluid, pressure and temperature conditions.
Why does the joint still leak after replacement?
Check for a damaged groove, scratched mating face, incorrect cross-section, twisted installation, housing distortion, excess clearance or leakage from a nearby joint.
Is a back-up ring included?
The supply scope is not defined here. Request an itemized quotation and specify whether companion seals or back-up rings are required.
Quotation checklist: send part number 402236, loader model and serial number, assembly location, groove or housing photos and the working fluid if known.
