The genuine XCMG 803190491 Hose Assembly is a high‑pressure hydraulic line specifically designed for motor grader brake actuation, steering systems, and auxiliary implement circuits. This OEM 803190491 assembly features a synthetic rubber inner tube, two layers of high‑tensile steel wire braiding, and an abrasion‑resistant outer cover. The hose is terminated with permanent, forged steel fittings (JIC 37° flare and ORFS) for leak‑free, vibration‑proof connections. Engineered for XCMG GR135, GR165, GR180, GR215, GR260, GR300, and GR350 motor graders, the 803190491 hose assembly withstands working pressures up to 28 MPa (4,000 psi) and impulse spikes exceeding 45 MPa. This assembly directly replaces worn, cracked, or chafed hoses in the parking brake circuit, articulation steering lines, and blade pivot lubrication systems.
The hose assembly delivers pressurized hydraulic fluid from the brake valve to the wheel cylinders, and from the steering control unit to the articulation cylinder. A leaking or burst hose causes loss of braking power or steering control, creating a major safety hazard. Replacing a damaged hose with genuine XCMG 803190491 restores full hydraulic integrity, eliminates oil spills, and ensures reliable operation in demanding grading applications.
This assembly is also used in differential lock engagement lines, transmission cooler circuits, and emergency brake release systems. XCMG 803190491 guarantees OE length, correct bend radius, and long service life even under extreme temperature fluctuations and continuous vibration.
| Parameter | Specification |
|---|---|
| OEM Number | 803190491 |
| Brand | XCMG (Genuine Original Equipment) |
| Product Type | Hydraulic Hose Assembly / Pressure Line |
| Hose I.D. | 9.5 mm (3/8 inch) |
| Overall Length (End to End) | 950 mm ±5 mm |
| Reinforcement Layers | 2 steel wire braids (high‑tensile) |
| Maximum Working Pressure | 28 MPa (4,000 psi) |
| Burst Pressure (min) | 112 MPa (16,000 psi) |
| Minimum Bend Radius | 95 mm (installed) |
| Fitting Type (Port 1) | JIC 37° flare, male, 9/16-18 UNF |
| Fitting Type (Port 2) | ORFS, male, M16×1.5 metric |
| Inner Tube Material | Synthetic rubber (oil‑resistant NBR) |
| Cover Material | Abrasion/weather‑resistant synthetic rubber |
| Temperature Range | -40°C to +121°C (-40°F to +250°F) |
| Fluid Compatibility | Mineral oils, synthetic fluids, brake fluids (DOT 3/4) |
| Standards | SAE 100R2AT, ISO 1436‑1 Type 2SN |
| Impulse Test | 200,000 cycles at 133% working pressure |
| Compatible Models | XCMG GR135, GR165, GR180, GR215, GR260, GR300, GR350 |
| Superseded Part Numbers | 803190477, 803190480, 803190488 |
The 803190491 hose assembly supplies pressurized fluid to the brake calipers and steering cylinders. A failure in this hose directly compromises operator safety and machine control.
In the parking brake release circuit, this hose maintains hydraulic pressure to disengage the spring‑applied brake. Loss of pressure causes unintended brake application and machine shutdown.
The hose also serves articulation steering, allowing the grader to turn. Leaks or ruptures result in sluggish steering or complete loss of directional control.
Replacing a worn hose with genuine XCMG 803190491 restores full brake application pressure and steering responsiveness, ensuring safe operation on slopes and job sites.
Each 803190491 hose assembly is manufactured using a mandrel‑assisted braiding process. Two layers of counter‑rotating steel wire provide high burst strength while retaining flexibility for complex routing.
The inner tube is extruded from nitrile rubber compound (NBR) and vulcanized to the reinforcement. The cover is compounded for ozone, UV, and abrasion resistance.
All fittings are crimped using computer‑controlled equipment with traceable crimp records. Each assembly is proof‑tested at 42 MPa (1.5x working pressure) for 60 seconds.
XCMG performs impulse testing on sample batches to validate fatigue resistance. Only assemblies passing all tests receive the XCMG brand and part number marking.
To replace a failed hose, relieve hydraulic pressure by cycling the brake pedal and steering wheel with engine off. Place a container to catch spilled oil.
Remove the old hose using a backup wrench on the fitting body to avoid twisting hydraulic ports. Inspect port threads and sealing faces for damage.
Hand‑start the new 803190491 hose fittings to prevent cross‑threading, then torque to specification (30‑35 Nm for JIC, 45‑50 Nm for ORFS).
Route the hose away from moving parts and sharp edges using protective sleeving. Start the engine, cycle the brake and steering, and inspect for leaks before returning to service.
Never repair a burst hose with tape or clamps – immediate replacement with genuine XCMG 803190491 is mandatory for safety.
Visible fluid seepage, bulging or blistering on the cover, wire reinforcement exposed, hardened or cracked rubber, and soft spongy feel when squeezed.
Also replace if fittings are corroded, the hose has been kinked or crushed, or if the assembly fails a pressure test. Do not delay replacement – a burst brake hose is a critical safety risk.
Inspect all brake and steering hoses every 500 operating hours. Look for chafing, cracks, or oil wetness. Replace any hose showing signs of aging.
For the 803190491 assembly, typical service life is 4,000‑5,000 hours under normal grading conditions. In high‑vibration or high‑temperature environments, replace every 2,000 hours.
Use spiral wrap or rubber sleeving where hoses contact metal edges. Keep hoses clean – accumulated dirt retains moisture and accelerates cover degradation.
When replacing one hose in a brake or steering circuit, consider replacing all hoses of similar age to prevent future failures and downtime.
Genuine XCMG 803190491 hose assemblies are backed by a 12‑month warranty. Stocked in regional warehouses in Houston, Rotterdam, Dubai, and Shanghai.
Standard air freight delivers within 3‑7 business days worldwide. Emergency 24‑48 hour shipping available for critical brake or steering repairs.
Bulk orders (10+ assemblies) receive volume discounts and sea freight options for large fleets. Aftermarket hoses often use inferior rubber or incorrect crimping.
Genuine XCMG 803190491 ensures proper materials, exact length, and factory‑certified crimping for maximum reliability and safety.
Don’t risk brake failure or steering loss – a leaking hose can lead to catastrophic accidents. Keep spare assemblies in your parts inventory.
Order the genuine XCMG 803190491 Hose Assembly today and maintain safe, responsive brake and steering systems for thousands of operating hours.
Upgrade your motor grader’s hydraulic reliability with XCMG genuine assemblies – precision engineered, impulse tested, and ready for the toughest grading conditions.
