The 803191118 Hose Coupling is a genuine XCMG hydraulic fitting manufactured for motor grader hydraulic systems, including steering, blade lift, circle drive, and implement circuits. This precision‑machined coupling, available as a threaded connector or quick‑disconnect type, provides leak‑free connections between hydraulic hoses and valves, cylinders, or pumps on XCMG GR series motor graders. Constructed from high‑strength carbon steel with a corrosion‑resistant zinc‑nickel plating, the 803191118 hose coupling is designed to withstand hydraulic pressures up to 35 MPa (5,000 psi) and extreme temperature fluctuations encountered in demanding grading operations.
The 803191118 hose coupling directly replaces worn, cracked, or leaking fittings in XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders. Typical applications include main pressure lines to the steering cylinder, blade lift control valves, circle rotation motor, and auxiliary hydraulic circuits. The coupling features precision‑cut threads (ISO 6149 or ORFS), a smooth sealing surface, and a captive O‑ring or metal‑to‑metal seal design that eliminates weepage and maintains system pressure integrity.
Proper hose coupling condition is vital for hydraulic system efficiency and safety. A damaged or loosely fitted coupling can cause oil leaks, pressure drops, contamination ingress, and even hose whip failure. Replacing a faulty coupling with the genuine XCMG 803191118 restores leak‑free operation, ensures consistent hydraulic power, and protects expensive components like pumps and valves from starvation or debris.
| Parameter | Specification |
|---|---|
| OEM Number | 803191118 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Hose Coupling / Hydraulic Fitting (Male or Female) |
| Connection Type | Threaded – ISO 6149 (metric) or ORFS (O‑ring face seal) |
| Thread Size | M18 × 1.5 (male) / M18 × 1.5 female port – per XCMG spec |
| Nominal Hose Inner Diameter | 12 mm (4‑wire spiral hose) / ½ inch equivalent |
| Material | Carbon steel (C45 / 1045), case‑hardened to 25‑30 HRC |
| Surface Finish | Zinc‑nickel plating (360h salt spray) + yellow chromate |
| Seal Type | Nitrile O‑ring (ISO 3601‑1) or metal‑to‑metal cone seat |
| Maximum Working Pressure | 35 MPa (350 bar / 5,075 psi) |
| Burst Pressure (min.) | 140 MPa (1,400 bar / 20,300 psi) |
| Operating Temperature Range | -40°C to +120°C (-40°F to +248°F) |
| Compatible Fluids | Mineral oil‑based hydraulic fluids (ISO VG 32, 46, 68) |
| Torque (installation) | 80 ± 5 N·m (for M18 thread, lubricated) |
| Standards | ISO 12151‑2, SAE J1453, DIN 20066 |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 motor graders |
| Superseded Part Numbers | 803191001, 803191045, 803191089, 803191094 |
The XCMG 803191118 hose coupling is installed at every hydraulic hose termination point on the grader. It creates a reliable, high‑pressure sealing interface between hoses and rigid components such as control valves, cylinders, pumps, and manifolds. Without leak‑free couplings, the hydraulic system would lose pressure, resulting in sluggish blade response and increased oil consumption.
Typical locations include the steering cylinder pressure lines, blade lift and tilt circuits, circle rotation drive lines, and auxiliary implement connections. The coupling’s precision‑machined threads and O‑ring groove ensure that even under the harshest shock loads (common during ripping), the connection remains tight and dry.
A worn or overtightened coupling can crack, causing sudden oil spray, fire hazard, and loss of hydraulic function. Replacing a damaged coupling with the genuine 803191118 restores full pressure integrity, eliminates environmental contamination from leaks, and ensures predictable machine control.
Each 803191118 hose coupling is produced from cold‑drawn carbon steel bar, then CNC turned to achieve exact thread profiles and sealing geometries. Threads are rolled rather than cut to improve fatigue strength. After machining, the coupling is carburized to a surface hardness of 25‑30 HRC, providing wear resistance while maintaining core toughness.
The sealing surfaces (cone seat or O‑ring groove) are finished to Ra ≤ 1.6 µm to ensure perfect sealing. A zinc‑nickel plating with yellow chromate conversion provides 360+ hours of salt spray resistance, protecting against corrosion from road salts and moisture. Every coupling is 100% inspected for thread go/no‑go and leak‑tested at 35 MPa.
XCMG’s quality system includes batch sample burst testing to 140 MPa. Only couplings that pass all criteria are laser‑marked with the XCMG logo and part number and packed in sealed anti‑rust bags. This ensures that every 803191118 coupling you receive meets or exceeds original equipment standards.
To replace the 803191118 hose coupling, first relieve hydraulic pressure and clean the area thoroughly. Use a backup wrench on the port to avoid twisting the hose. Unscrew the old coupling with a crowfoot or line wrench. Inspect the port threads and sealing surface for damage.
Lubricate the new coupling threads with clean hydraulic oil. If an O‑ring seal is used, lightly grease the O‑ring to prevent pinching. Screw the coupling into the port by hand until finger‑tight, then torque to the value specified (80 N·m for M18 threads). Over‑tightening can crack the fitting or distort the seal.
After installation, pressurize the system and check for leaks with tissue paper. Tighten slightly if a weep is observed, but never exceed maximum torque. Always replace the O‑ring each time the coupling is removed. Keep a selection of 803191118 couplings in your parts kit for field repairs.
Common signs that the 803191118 hose coupling requires replacement: visible oil seepage around the fitting, corrosion or pitting on the hex flats, stripped or damaged threads, cracked O‑ring groove, and difficulty in disconnecting a quick‑connect type. Also, if the coupling is deformed from impact (e.g., rock strike), replace it immediately.
A catastrophic coupling failure can cause sudden oil ejection, leading to complete loss of steering or blade control – a serious safety hazard. Do not attempt to weld or repair a damaged coupling. Always replace with a genuine XCMG 803191118 to ensure correct thread engagement and pressure rating.
Aftermarket hose couplings are often made from lower‑grade steel that corrodes quickly or has poorly formed threads that strip during installation. Some counterfeit couplings use SAE threads while XCMG uses ISO metric threads, resulting in cross‑threading and port damage. Aftermarket O‑rings may be incompatible with hydraulic fluids, leading to rapid swelling and leakage.
Genuine XCMG 803191118 couplings are manufactured to exact XCMG drawings, with precise thread tolerances and heat treatment. They are fitted with OEM‑spec O‑rings made from nitrile rubber resistant to mineral oils and high temperatures. The zinc‑nickel plating provides superior corrosion resistance, essential for graders used in coastal or road‑salt environments.
XCMG provides a 12‑month warranty against manufacturing defects. Each genuine coupling is traceable and marked with the XCMG logo. Using genuine XCMG hose couplings ensures leak‑free hydraulic systems, protects pumps from cavitation, and reduces oil consumption. Don’t risk your grader’s reliability with cheap imitations.
Inspect all 803191118 hose couplings during daily walk‑around checks. Look for signs of weeping, oil stains on the hose exterior, or dust accumulation that indicates a slow leak. Annually (or every 1,000 hours), use a torque wrench to verify proper tightness of all accessible couplings.
Replace couplings when replacing hydraulic hoses – the old coupling may have degraded threads or a damaged seal seat. Keep a spare O‑ring kit and a few couplings in your service truck for emergency line repairs. Over‑torquing is a common cause of coupling failure; always use a torque wrench.
When washing the machine, avoid direct high‑pressure water spray onto coupling seals – water can be forced past the O‑ring, causing internal rust. After any coupling replacement, run the machine and cycle the hydraulic functions, then re‑check for leaks. Preventive maintenance of couplings is inexpensive compared to a hydraulic pump failure due to aeration or contamination.
The 803191118 Hose Coupling is stocked in XCMG regional warehouses: Houston (North America), Rotterdam (Europe), Dubai (Middle East), and Shanghai (Asia). Standard air freight delivers within 3‑7 business days; expedited 1‑2 day shipping is available for urgent hydraulic leak repairs. Sea freight options are offered for bulk orders (50+ pieces).
Each coupling is individually packed in a VCI bag to prevent corrosion, then placed in a foam‑lined carton. For large fleets, consignment stock programs ensure immediate availability and reduce downtime caused by leaking fittings. Don’t let a worn coupling spray oil and shut down your grader.
Order the genuine XCMG 803191118 Hose Coupling today and restore leak‑free performance to your motor grader’s hydraulic system. Whether you are replacing a weeping fitting on a blade lift line or rebuilding an entire hydraulic circuit, the 803191118 guarantees correct thread fit, reliable sealing, and long service life. Keep your grader operating cleanly and efficiently.
Upgrade your hydraulic maintenance with OEM‑grade XCMG components. The 803191118 hose coupling reflects XCMG’s commitment to precision, durability, and safety. Trust genuine parts to keep your GR series motor graders delivering full hydraulic power without drips or failures.
