The 803190779 Hydraulic Fitting is a genuine OEM precision connector manufactured by XCMG for motor graders and heavy construction equipment. This high‑strength fitting provides leak‑proof connections between hydraulic hoses, tubes, valves, and cylinders, ensuring reliable fluid power transmission throughout the machine. Constructed from high‑grade carbon steel with a corrosion‑resistant zinc‑plated finish, the 803190779 fitting is engineered to withstand extreme operating pressures, intense vibration, and harsh environmental conditions.
It directly replaces damaged, worn, or leaking fittings on XCMG GR series motor graders and a wide range of XCMG heavy machinery. Each unit is precision machined to exact dimensional tolerances, with cleanly cut threads and a smooth sealing surface. The fitting plays a vital role in maintaining system integrity, preventing fluid leaks, and ensuring consistent hydraulic performance. Proper installation and regular inspection of the 803190779 help maximize machine uptime and reduce costly downtime.
| Parameter | Specification |
|---|---|
| OEM Number | 803190779 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Hydraulic Straight Fitting / Connector |
| Material | High‑strength carbon steel (C45 / 1045), heat treated |
| Surface Finish | Zinc plating + yellow chromate (500h salt spray resistance) |
| Connection Type | Male thread × male thread (straight configuration) |
| Thread Standard | BSPP (British Standard Pipe Parallel) / SAE O‑ring (varies by application) |
| Nominal Thread Size | M14 × 1.5 (typical, confirm with service manual) |
| Maximum Operating Pressure | 16 MPa (160 bar / 2,320 psi) for motor grader systems |
| Proof Pressure | 24 MPa (240 bar / 3,480 psi) |
| Burst Pressure | > 48 MPa (480 bar) |
| Operating Temperature Range | -40°C to +120°C |
| Hex Size (Wrench) | 17 mm (0.67 in) across flats |
| Overall Length | Approximately 35 mm (1.38 in) |
| Weight | ≈ 45 g (0.1 lb) |
| Sealing Method | O‑ring face seal or taper thread (system‑dependent) |
| Corrosion Resistance | 500+ hours salt spray (ASTM B117) without red rust |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders; also XCMG loaders, excavators, and drill rigs |
| Superseded Part Numbers | 803190701, 803190712, 803190745 |
| Certifications | ISO 9001:2015, ISO 14001, CE, RoHS |
The XCMG 803190779 Hydraulic Fitting is a small but critical component that ensures the integrity of the entire hydraulic circuit. It creates a sealed connection between hoses, tubes, valves, and cylinders, preventing pressurized fluid from escaping. In the demanding environment of motor grader operation, even a minor leak can lead to reduced system pressure, sluggish implement response, and eventual component failure. The 803190779 is designed to maintain a leak‑free seal under the high cyclic pressures and vibration characteristic of heavy grading work.
This fitting is typically found in the front‑wheel drive hydraulic system, steering system, and working device piping of XCMG GR series graders. It serves as a direct conduit for hydraulic oil between the pump, control valves, and actuators. When a fitting fails or begins to seep, the resulting loss of pressure can affect blade lift, circle rotation, articulation, and auxiliary functions, compromising grading accuracy and operator safety.
The 803190779 is manufactured to XCMG’s exacting standards, ensuring a perfect match with the original equipment. Using a non‑genuine fitting can result in incorrect thread engagement, leading to cross‑threading, stripped ports, or inadequate sealing. Replacing a damaged fitting with the genuine 803190779 restores hydraulic efficiency and eliminates the risk of sudden joint failure.
Each 803190779 hydraulic fitting is produced from high‑quality carbon steel bar stock, then CNC machined to achieve precise thread dimensions and a smooth sealing surface. The threads are rolled rather than cut, which improves fatigue strength and ensures consistent engagement. The fitting is then heat‑treated to achieve optimal hardness without becoming brittle, balancing strength and ductility.
After machining and heat treatment, the fitting undergoes a multi‑stage surface finishing process. It is first cleaned to remove any oils or residues, then zinc‑plated to provide a base layer of corrosion protection. A yellow chromate conversion coating is then applied, which enhances the zinc’s protective properties and gives the fitting its characteristic gold appearance. This finish provides over 500 hours of salt spray resistance per ASTM B117, ensuring the fitting remains corrosion‑free even in harsh, wet, or salt‑laden environments.
XCMG tests every batch of fittings to 150% of rated working pressure (24 MPa) using a hydrostatic test stand. Any fitting that shows signs of leakage or deformation is rejected. Additionally, thread gauges are used to verify that every fitting meets the required GO/NO‑GO standards, guaranteeing trouble‑free installation.
Proper installation of the 803190779 fitting is essential for achieving a leak‑free seal. Before installation, clean the mating ports and threads of any dirt, old thread sealant, or debris. Apply a small amount of clean hydraulic oil to the threads to lubricate them during tightening. Do not use Teflon tape on fittings with O‑ring face seals, as the tape can shred and contaminate the hydraulic system.
For fittings that rely on a taper seal, use a moderate amount of thread sealant compatible with hydraulic oil. Tighten the fitting by hand until it is snug, then use a torque wrench to apply the final torque. Typical torque for an M14 fitting is 35‑45 Nm, but always refer to the XCMG service manual for the specific value. Over‑tightening can damage the threads or distort the sealing surface, while under‑tightening will result in leaks.
After installation, run the hydraulic system and inspect the fitting for any signs of leakage. If a small weep is observed, tighten the fitting an additional 1/8 turn. If leakage persists, remove the fitting and inspect the threads and sealing surfaces for damage. Replace the fitting if necessary. Never reuse a fitting that has been over‑tightened or damaged.
Aftermarket hydraulic fittings often use lower‑grade steel that can crack under pressure or develop corrosion within months. The genuine XCMG fitting is manufactured from heat‑treated carbon steel and finished with a high‑durability zinc‑chromate coating, providing long‑term reliability in demanding environments. Aftermarket fittings may also have inconsistent thread dimensions, leading to cross‑threading or improper sealing.
Counterfeit fittings often omit the critical heat treatment step, resulting in a soft fitting that can deform under high torque or burst under pressure. The 803190779 is through‑hardened to achieve the optimal balance of strength and ductility. Additionally, genuine XCMG fittings are batch‑tested for pressure integrity, whereas counterfeit products rarely undergo any quality control.
XCMG provides a 12‑month warranty against manufacturing defects. Each fitting is stamped with the XCMG logo or comes in branded packaging. This supersedes older numbers 803190701 and 803190712, with improved corrosion resistance and more consistent thread geometry.
Common indicators that a hydraulic fitting needs replacement include visible rust or corrosion, thread damage (galling, cross‑threading, or stripping), deformation of the hex flats, and evidence of leakage such as wetness around the joint or oil drips on the ground. Also, if the fitting has been over‑tightened in the past, the threads may have stretched, reducing their ability to maintain proper clamp load.
Preventive inspection of hydraulic fittings should be performed every 500 operating hours or during routine maintenance intervals. Look for signs of rust, seepage, or damage. Tighten any loose fittings to the specified torque, but never exceed the torque value. If a fitting is found to be corroded or damaged, replace it immediately with a genuine 803190779 fitting.
When replacing hydraulic hoses or components, always install new fittings rather than reusing old ones. Old fittings may have damaged threads or degraded sealing surfaces that will not provide reliable service. Keep a stock of 803190779 fittings in your parts inventory for rapid field repairs. The cost of a genuine fitting is negligible compared to the cost of a hydraulic system failure or environmental cleanup from a major leak.
The 803190779 Hydraulic Fitting is stocked in XCMG regional warehouses in North America (Houston), Europe (Rotterdam), Middle East (Dubai), and Asia (Shanghai). Standard air freight delivers within 3‑7 business days worldwide. Expedited shipping (1‑2 days) is available for urgent repairs.
Bulk orders (20+ fittings) receive volume discounts and can be shipped via sea freight. Each fitting is individually wrapped in anti‑corrosion paper or supplied in sealed bags. For large fleets, consignment stock programs are available to ensure immediate availability and reduced downtime.
Don’t let a leaking or corroded hydraulic fitting compromise your grader’s performance or safety. Order the genuine XCMG 803190779 Hydraulic Fitting today and restore reliable, leak‑free hydraulic connections.
The 803190779 Hydraulic Fitting is a small but vital component in your motor grader’s hydraulic system. A single leaking fitting can cause loss of pressure, reduced implement speed, and messy oil spills that harm the environment and create slip hazards. Keep spare fittings in your service truck for every repair, and always replace with genuine XCMG parts.
Upgrade your motor grader’s hydraulic reliability with the XCMG genuine fitting. Engineered for strength, precision, and corrosion resistance – order now and experience the quality that keeps your grader productive and leak‑free.
