OEM 801138356 The XCMG O‑ring 45×3.55‑S (801138356) is a genuine OEM sealing component engineered to provide reliable, leak‑free sealing in hydraulic and pneumatic circuits of XCMG hydraulic excavators. This precision‑moulded O‑ring, identified by part number 801138356, ensures consistent sealing performance, exceptional resistance to hydraulic fluids, and long‑term durability in the most demanding construction, mining, and demolition environments.
Manufactured from high‑quality Nitrile (NBR) compound with excellent oil and temperature resistance, the 801138356 O‑ring delivers superior compression set resistance and sealing integrity. Its exact dimensions – 45 mm inside diameter and 3.55 mm cross‑section – guarantee a direct replacement without modification, ensuring seamless integration with your XCMG excavator’s existing sealing grooves and preserving the machine’s original leak‑free performance and safety characteristics.
The 801138356 O‑ring features a robust, precisely‑sized design that accommodates the sealing requirements of hydraulic cylinders, valve blocks, and fluid connectors. Its smooth surface finish and consistent cross‑section provide uniform sealing pressure, preventing fluid leakage and contamination ingress. By providing reliable static or dynamic sealing, this O‑ring plays an essential role in preventing system failures, reducing maintenance costs, and extending the service life of your excavator’s hydraulic system in the toughest working conditions.
The 801138356 O‑ring is manufactured from a high‑grade Nitrile (NBR) compound specifically formulated to deliver excellent sealing performance in hydraulic and pneumatic applications. Its precise moulding and consistent cross‑section ensure uniform compression and reliable sealing pressure, even under fluctuating loads and temperature variations.
The O‑ring’s geometry is engineered to fit perfectly into standard O‑ring grooves, providing a reliable barrier against fluid leakage and contamination ingress. The smooth, flash‑free surface finish reduces friction and wear during assembly, ensuring a long service life and minimising the risk of installation damage.
By providing stable, leak‑free sealing, the 801138356 O‑ring plays a vital role in preventing hydraulic fluid loss, maintaining system pressure, and protecting sensitive components from contamination – all of which contribute to reduced maintenance frequency and extended equipment life.
Its exact dimensions – 45 mm inside diameter and 3.55 mm cross‑section – guarantee a perfect fit in OEM‑specified grooves, eliminating the need for trimming or adjustment. Whether used in static or dynamic sealing applications, this O‑ring delivers consistent, reliable performance that keeps your XCMG excavator operating at peak efficiency.
The 801138356 O‑ring is produced using advanced compression moulding and post‑curing processes that achieve tight tolerances on all critical dimensions, ensuring consistent sealing performance across every unit.
The Nitrile rubber compound is selected for its excellent resistance to mineral oils, hydraulic fluids, and water‑glycol mixtures, as well as its good compression set resistance and low‑temperature flexibility. The compound is mixed in‑house to ensure batch‑to‑batch consistency, and each moulding cycle is carefully controlled to eliminate flash and surface defects.
After moulding, each O‑ring undergoes a post‑curing process to achieve optimal cross‑link density, ensuring maximum durability and resistance to ageing. Dimensional inspection is performed using laser measurement systems to verify that ID, CS, and hardness meet the required specifications.
Sample units from each production batch are subjected to compression set testing, accelerated ageing, and fluid immersion tests to validate long‑term sealing performance. The result is an O‑ring that delivers consistent, reliable sealing throughout the service life of your XCMG excavator.
O‑rings are among the most critical sealing elements in hydraulic systems. A single failed or deteriorated O‑ring can lead to internal or external leakage, pressure drops, and eventual system failure. In excavators, where hydraulic circuits operate at high pressures (up to 35 MPa or more), the reliability of each seal is paramount.
The 801138356 O‑ring provides a robust, precision‑engineered solution that ensures leak‑free operation in cylinder glands, valve body connections, and fluid port fittings. Its Nitrile compound is specifically formulated to resist degradation from hydraulic oil and maintain its sealing properties over thousands of operating hours.
Field data from heavy equipment maintenance programmes shows that using genuine XCMG O‑rings significantly reduces the frequency of seal‑related repairs. The 801138356’s excellent compression set resistance ensures that it maintains effective sealing pressure even after prolonged compression, reducing the likelihood of leaks that can lead to downtime and environmental contamination.
Regular inspection of O‑rings for signs of hardening, cracking, or extrusion is recommended; any compromised seals should be replaced promptly with genuine 801138356 components to restore leak‑free integrity and prevent costly collateral damage.
The 801138356 O‑ring is designed for straightforward installation using standard tools and practices, minimising downtime during seal replacement or assembly work.
Before installation, carefully inspect the O‑ring for any signs of damage, deformation, or surface defects. Ensure that the sealing groove and mating surfaces are clean, dry, and free from burrs or sharp edges that could damage the seal during installation.
Lubricate the O‑ring with a light coat of hydraulic oil or assembly lubricant compatible with NBR to reduce friction and prevent rolling or twisting. Fit the O‑ring into the groove, ensuring that it sits uniformly and is not over‑stretched. Assemble the mating parts with care, avoiding pinching or shearing.
During routine maintenance, inspect visible O‑rings for signs of leakage, hardening, or extrusion. If leakage is detected, replace the O‑ring immediately with a genuine 801138356 part. Always use the correct size and compound to maintain original sealing performance.
By following these simple practices, you can ensure that your XCMG excavator’s hydraulic system remains leak‑free and reliable over its service life.
Investing in the genuine 801138356 O‑ring yields significant long‑term savings by preventing hydraulic fluid leaks, reducing system pressure losses, and avoiding the costly downtime that often accompanies seal failures.
A single leaking O‑ring can lead to a gradual loss of hydraulic fluid, increased operating temperatures, and accelerated wear of pumps and valves – risks that are virtually eliminated with a properly specified OEM seal.
Over a typical 10,000‑hour service life, an excavator’s hydraulic system may contain dozens of O‑rings. The 801138356’s superior compression set resistance and oil resistance ensure that it maintains its sealing effectiveness far longer than non‑genuine alternatives, reducing the number of seal replacements and associated labour costs.
Field data shows that maintenance programmes using genuine XCMG O‑rings experience up to 30% fewer seal‑related failures. This translates to lower fluid consumption, reduced environmental impact, and higher machine availability – all of which contribute to a lower total cost of ownership.
XCMG is committed to sustainable manufacturing, and the 801138356 O‑ring reflects this commitment through the use of environmentally responsible materials and production processes. The Nitrile compound is free from hazardous substances such as lead, cadmium, and mercury, and complies with RoHS and REACH directives.
By preventing hydraulic fluid leaks, this O‑ring helps protect soil and water resources from contamination, aligning with global environmental regulations and corporate stewardship goals. Its long service life also reduces the frequency of disposal and the associated environmental footprint.
When the O‑ring eventually reaches the end of its useful life, it can be responsibly disposed of in accordance with local regulations, as the material is non‑hazardous and can be incinerated with energy recovery or processed through appropriate waste management channels.
The 801138356 O‑ring is stocked in XCMG’s regional distribution centres across North America, Europe, Asia, and Australia, ensuring rapid availability to support your maintenance schedules and minimise downtime.
Each O‑ring is individually packaged in protective bags and custom‑fitted cartons to prevent contamination, damage, or deformation during transit and warehousing. For large volume orders, XCMG offers consolidated shipping and volume‑based pricing to optimise procurement costs.
Real‑time inventory visibility through XCMG’s dealer network allows you to plan maintenance with confidence, ensuring that critical seals are on hand when you need them, reducing lead times and keeping your excavator fleet productive.
Every 801138356 O‑ring is manufactured in an ISO 9001 and ISO 14001 certified facility with full material traceability from raw rubber to finished product.
Incoming rubber compounds are tested for hardness, tensile strength, elongation, and compression set to ensure they meet the required specifications. During moulding, process parameters such as temperature, pressure, and cure time are continuously monitored to guarantee consistent quality.
After production, each O‑ring undergoes 100% dimensional inspection using optical measurement systems, and random samples are subjected to hardness and compression set testing. Batch‑level testing includes fluid immersion, heat ageing, and ozone resistance to validate long‑term performance.
Only O‑rings that pass all quality checks are released, ensuring that you receive a reliable, high‑performance sealing component that meets XCMG’s stringent quality standards.
Aftermarket O‑rings often use inferior rubber compounds, incorrect hardness, or poor dimensional accuracy, leading to premature failure, leakage, and system contamination. These issues can result in costly downtime, fluid loss, and even damage to critical components.
The genuine 801138356 is engineered to XCMG’s exacting specifications, ensuring correct size, proper material grade, and reliable sealing performance. Its precision moulding and consistent quality give you confidence that every seal you install will perform as intended, protecting your hydraulic system from leaks and contamination.
Using genuine XCMG seals also preserves warranty coverage, maintains equipment resale value, and ensures compatibility with other OEM components. Trust the original – it’s a small investment that delivers significant protection and peace of mind.
The XCMG 801138356 O‑ring 45×3.55‑S is an essential sealing component for any XCMG hydraulic excavator, ensuring leak‑free, reliable operation of hydraulic cylinders, valve blocks, and fluid connectors in the most demanding working conditions.
Its precision‑engineered design, high‑quality Nitrile compound, and robust manufacturing deliver dependable sealing performance, reducing maintenance costs, preventing fluid loss, and extending machine service life.
Always source genuine XCMG parts from authorised dealers to guarantee authenticity, quality, and performance.
Choose the 801138356 O‑ring for dependable sealing and lasting operational peace of mind.
Partner with XCMG – your trusted source for heavy equipment sealing components that deliver real value.
OEM 801138356 – XCMG O‑ring 45×3.55‑S – the definitive sealing solution for your excavator’s hydraulic system. Engineered for durability, designed for reliable leak‑free performance, and backed by global quality standards. Trust the original to protect your investment and maximise uptime.
