The Shacman Riveted Upper Friction Lining, bearing the official OEM part number **199000340068-WX**, is a critical component engineered for the braking systems of heavy-duty Shacman trucks. This high-performance friction lining is specifically designed for the upper section of brake shoes, where it provides reliable and consistent stopping power under extreme conditions. As a genuine Shacman part, **199000340068-WX** ensures perfect compatibility, optimal material composition, and the durability required for commercial vehicle operations.
Constructed from advanced friction materials and securely riveted to the brake shoe, this lining offers exceptional resistance to wear, heat fade, and cracking. It is a direct replacement part that restores factory braking performance, ensuring safety and reliability for every journey. Choosing the genuine 199000340068-WX lining is an investment in the safety and longevity of your Shacman truck’s most vital system.
| Parameter | Specification |
|---|---|
| OEM Part Number | 199000340068-WX |
| Product Name | Riveted Upper Friction Lining / Brake Lining |
| Brand | Shacman |
| Attachment Method | Riveted (Steel Rivets) |
| Position | Upper Section of Brake Shoe |
| Friction Material Type | Heavy-Duty Non-Asbestos Organic (NAO) or Semi-Metallic |
| Thickness (New) | Approx. 15-18 mm (Specific to application) |
| Operating Temperature Range | -40°C to +400°C (Short-term peaks higher) |
| Friction Coefficient (μ) | Stable, typically between 0.35 – 0.42 |
| Compatible Models | Shacman Tractor Trucks, Dump Trucks (Specific axle models) |
Friction linings are the consumable heart of a drum brake system. When the brake pedal is pressed, the shoe expands, pressing this lining against the rotating brake drum. The resulting friction converts kinetic energy into heat, slowing the vehicle. The upper lining, such as part 199000340068-WX, bears a significant portion of this force and heat.
The “riveted” construction is a hallmark of durability and serviceability. Unlike bonded linings, riveted ones are mechanically fastened with steel rivets. This allows for secure attachment that can withstand high temperatures and forces, and it permits the lining to be replaced separately from the shoe itself in many cases, offering potential cost savings.
The Shacman 199000340068-WX lining is engineered as a system-matched component. Its friction characteristics are carefully calibrated to work in harmony with the specific metallurgy of Shacman brake drums, ensuring predictable pedal feel, effective braking, and minimal drum wear.
The 199000340068-WX lining is formulated from advanced, heavy-duty friction compounds. These materials are designed to provide a stable coefficient of friction across a wide temperature range. This means consistent braking power whether the brakes are cold or have been heated by repeated use on a downhill slope.
A critical feature is its exceptional resistance to fade. “Fade” is the dangerous reduction in braking power caused by overheating. The materials in this Shacman lining are thermally robust, maintaining integrity and performance under extreme stress, which is crucial for the safety of heavily laden trucks.
Furthermore, the lining is engineered for low wear on the brake drum. While being effective at stopping, its formulation is designed to be less abrasive than some competitive materials, helping to extend the service life of the more expensive brake drum, reducing total operating costs.
The use of steel rivets provides a failsafe mechanical connection. Even under intense heat that could weaken adhesives, the rivets hold firm. This construction also allows for clear visual inspection; wear can be measured down to the rivet heads, providing an unambiguous signal for replacement.
This lining is not just for standard braking. It is optimized for the severe duty cycles of commercial transport—frequent stopping, high gross vehicle weights, and extended periods of use. Its durability translates directly into longer service intervals and reduced downtime for maintenance.
Installation of the 199000340068-WX Riveted Friction Lining should be performed by a qualified technician as part of a complete brake service. The process involves removing the brake drum and wheel assembly, detaching the brake shoe, and carefully removing the worn lining along with its old rivets.
The new lining must be aligned precisely on the brake shoe table. Using the correct size and grade of rivets is mandatory to ensure safe operation. Rivets must be driven in firmly and evenly, with their heads sitting flush against the lining surface without cracking it. Proper rivet setting tools are essential.
Compatibility is key. The 199000340068-WX is designed for specific Shacman truck models and axles. Before installation, always verify the OEM number against the vehicle’s parts catalog or a VIN-based lookup. Using the correct lining ensures proper contact with the drum and optimal braking force distribution.
The primary safety function of this component cannot be overstated. A high-quality friction lining like the 199000340068-WX is your first line of defense in preventing accidents. Its reliable performance ensures shorter stopping distances and predictable vehicle behavior during emergency braking maneuvers.
Performance is also tied to proper “bedding-in.” After new linings are installed, a specific break-in procedure should be followed. This involves a series of moderate, gradual stops to evenly transfer a layer of friction material onto the drum surface. This process maximizes contact area and establishes the optimal friction partnership for long life.
Regular inspection is crucial. The main wear indicator for a riveted lining is the rivet head itself. Once the lining material wears down to within 1-2 mm of the rivet head, the lining must be replaced immediately. Continuing to use it beyond this point will cause rivets to score the brake drum, leading to costly damage.
Proactive brake maintenance is a core principle of fleet management. Regularly scheduled inspections should include measuring lining thickness on all shoes. Linings should be replaced in axle sets (both left and right) to maintain balanced braking and prevent vehicle pull.
Common issues often have clear causes. Rapid or uneven wear can indicate a malfunctioning brake cylinder, a seized shoe pivot pin, or a contaminated lining (e.g., by brake fluid or grease). A thorough investigation should always accompany lining replacement to address the root cause.
Noise, such as squealing or grinding, can be a symptom. While new linings may squeak lightly during bedding-in, persistent noise or grinding after break-in could signal improper installation, a lack of lubricant on contact points, or, in the worst case, metal-on-metal contact from a fully worn lining.
To maximize the life of your 199000340068-WX linings, avoid riding the brake pedal and use engine braking techniques on long descents where possible. Ensure brake adjustment mechanisms are functioning correctly to prevent dragging brakes, which create constant heat and wear.
Choosing the genuine Shacman 199000340068-WX lining over a generic aftermarket part is a decision for safety and value. OEM parts are engineered as part of a complete system. The friction formula is tested and validated with Shacman drums to deliver a precise balance of stopping power, wear rate, and heat management.
Aftermarket linings may promise similar specifications but often use different material blends. These can lead to unpredictable performance—either being too aggressive (causing rapid drum wear and noise) or too soft (leading to faster wear and potential fade). This variability compromises safety and can increase long-term costs.
Furthermore, the dimensional accuracy of the genuine part guarantees a perfect fit. An ill-fitting lining can have incorrect contact with the drum, creating hotspots, reduced braking efficiency, and vibration. The OEM 199000340068-WX eliminates this risk entirely.
It refers to the lining’s position on the brake shoe. A typical duo-servo brake shoe has two separate friction linings: a longer “primary” or upper lining at one end and a shorter “secondary” lining at the other. The upper lining, part 199000340068-WX, is crucial for initial braking force application.
The most reliable method is visual and physical inspection. Measure the lining thickness. If it is worn to within 1-2 mm (approx. 1/16 inch) of the rivet heads, immediate replacement is required. Do not wait for the rivets to contact the drum, as this causes severe damage.
No. For safety and performance, friction linings must always be replaced in complete axle sets (both wheels on the same axle). Replacing only one lining creates a braking imbalance, which can cause the vehicle to pull to one side during braking, a dangerous condition.
Summary: The Shacman Riveted Upper Friction Lining 199000340068-WX is a safety-critical OEM component designed for reliability and performance. Its advanced friction material provides stable stopping power and heat resistance, while the robust riveted construction ensures secure attachment and clear wear indicators. Proper installation by a qualified technician, regular inspection for wear, and replacement in complete axle sets are fundamental to maintaining your truck’s braking integrity. Opting for this genuine Shacman part guarantees system compatibility, predictable performance, and ultimately, the safety of your vehicle, cargo, and driver on every trip.
