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The reliability of a heavy-duty truck’s drivetrain depends on the flawless interaction of countless precision components. When wear occurs, selecting the correct Sinotruk howo parts is essential for restoring performance and preventing cascading damage. The F500-A 1802191 Main Shaft Sleeve, with dimensions 50*72*10, is a critical wear component within the transmission assembly of SINOTRUK Howo trucks. This precision-engineered sleeve acts as a bearing surface and alignment guide for the main shaft, ensuring smooth rotation, reducing friction, and maintaining proper gear engagement. Installing the genuine F500-A 1802191 sleeve is a fundamental step in any transmission overhaul, directly contributing to efficient power transfer, reduced operational noise, and extended gearbox service life under the most demanding loads.
The F500-A 1802191 Main Shaft Sleeve is a cylindrical, precision-machined bushing or wear sleeve that fits over the transmission’s main shaft (input shaft or counter shaft). Its primary dimensions—50mm inner diameter, 72mm outer diameter, and 10mm width (50*72*10)—are engineered to exact SINOTRUK Howo OEM tolerances. This component serves as a sacrificial wear surface between rotating shafts and stationary transmission housings or between two concentric rotating components. The genuine F500-A 1802191 sleeve prevents direct metal-to-metal contact, reduces friction and heat generation, maintains critical oil clearances for lubrication, and protects the more expensive main shaft from scoring and wear. It is a vital component for ensuring precise alignment and smooth rotational movement within the gearbox.
During transmission operation, the sleeve bears radial loads and endures constant sliding or rotational friction. Over time, it will wear predictably, which is why it is designed as a replaceable component. Using the correct OEM part, F500-A 1802191, during a rebuild ensures that all clearances and fitments are restored to factory specifications, which is crucial for optimal gear shifting, power efficiency, and preventing oil leaks that can occur from excessive clearance.
Precision Dimensions: Manufactured to exact 50mm ID x 72mm OD x 10mm width specifications, part F500-A 1802191 guarantees a perfect press-fit or sliding fit with the main shaft and its corresponding bore, ensuring optimal oil clearance and load distribution.
Wear-Resistant Material: Typically made from high-grade bronze alloys (like SAE 660), ductile iron, or steel with a special surface treatment, offering excellent wear resistance, conformability, and embeddability for foreign particles.
Low-Friction Surface: The internal and external surfaces are finely machined and often grooved or textured to retain lubrication oil, reducing friction and heat build-up during high-speed rotation.
High Load & Temperature Tolerance: Engineered to withstand the high radial loads from gear mesh and the elevated operating temperatures inside a transmission without deforming or losing its structural integrity.
Optimized Lubrication Design: May include oil grooves or holes that channel transmission fluid to critical bearing surfaces, ensuring a consistent lubricating film and preventing dry starts.
Shaft Protection: Acts as a sacrificial component. Wear is concentrated on the replaceable sleeve F500-A 1802191, protecting the more costly and harder-to-replace main shaft from damage and extending its life.
The table below presents the complete technical data for the SINOTRUK Howo Main Shaft Sleeve, part number F500-A 1802191. These specifications are critical for correct identification and application.
| Specification | Value / Description | Remarks |
|---|---|---|
| OEM Part Number | F500-A 1802191 | Primary Identifier |
| Product Name | Main Shaft Sleeve | Common Description |
| Dimensions (ID x OD x Width) | 50 mm x 72 mm x 10 mm | Critical Sizing |
| Brand | SINOTRUK Howo | OEM Manufacturer |
| Component Type | Transmission Wear Sleeve / Bushing | Drivetrain Component |
| Primary Material | Bronze Alloy (e.g., SAE 660) or Steel | High Wear Resistance |
| Surface Finish | Precision Machined, May Include Oil Grooves | For Lubrication Retention |
| Compatible Models | SINOTRUK Howo A7, T7G, and other series with specific multi-speed manual transmissions (e.g., Fast Gear models) | Verify Transmission Model |
| Application | Fitted on Main Shaft (Input/Counter Shaft) within transmission case | Internal Gearbox Component |
| Quality Standard | OEM Specifications, 100% Dimensional Inspection | Genuine SINOTRUK Howo Part |
The F500-A 1802191 Main Shaft Sleeve is installed within the core of the multi-speed manual transmissions used in various SINOTRUK Howo models. Its precise location is on the main shaft (which could be the input shaft, counter shaft, or main output shaft depending on the transmission design), typically where the shaft rotates within a bore in the transmission case or within a bearing housing.
Specific Function and Location:
• Bearing Surface: Provides a smooth, low-friction rotating surface for the shaft against the stationary transmission housing or intermediate plate.
• Alignment Guide: Helps maintain the precise concentric alignment of the main shaft, which is critical for proper gear mesh and synchro operation.
• Wear Management: Positioned at high-load points, such as near gear clusters or bearing seats, to absorb wear and protect the hardened steel shaft.
• Oil Seal Surface: In some designs, it provides a true cylindrical surface for lip seals to ride against, preventing transmission oil leaks.
• Transmission Models: Used in heavy-duty manual gearboxes supplied by manufacturers like Fast Gear and ZF, commonly fitted to Howo A7, T7G, and other heavy-duty series for freight and construction.
The sleeve F500-A 1802191 is a consumable part during a transmission rebuild. It is always recommended to replace it whenever the transmission is disassembled for repair, as its wear directly affects clearances and performance. Using the correct OEM sleeve ensures compatibility with the specific shaft hardness and thermal expansion characteristics of your transmission.
Installing a main shaft sleeve requires precision, proper tools, and a clean environment. The transmission must be completely disassembled to access the main shaft. The old sleeve is typically removed using a bearing puller or a press. The shaft and the bore in the housing must be meticulously cleaned and inspected for scoring or damage before the new sleeve is installed.
Critical Installation Notes for Sleeve F500-A 1802191:
Selecting the authentic OEM main shaft sleeve, part number F500-A 1802191, is a critical factor for a successful and durable transmission rebuild. Genuine SINOTRUK Howo sleeves are manufactured from precisely specified alloys that offer the ideal balance of hardness, wear resistance, and conformability. Their dimensions are held to micrometer tolerances, ensuring the correct interference fit and running clearance.
Aftermarket sleeves may use inferior materials that wear too quickly or are too hard, leading to shaft scoring. Incorrect dimensions can result in a loose fit (causing vibration and oil leaks) or an overly tight fit (leading to overheating and seizure). The genuine F500-A 1802191 sleeve is designed to work in harmony with the specific metallurgy of the main shaft and the thermal dynamics of the transmission, providing reliable service and protecting your investment in the overhaul.
A worn or failing main shaft sleeve can manifest in several ways, often overlapping with other transmission issues. Excessive clearance due to sleeve wear can lead to increased vibration and a noticeable whirring or rumbling noise from the transmission that changes with engine speed but not with vehicle load. Gear shifting may become notchy or difficult as shaft alignment degrades.
More severe symptoms include transmission fluid leaks from the front or rear of the gearbox, as worn sleeves can compromise seal surfaces. Metal shavings or a bronze tint in the transmission oil during a drain is a strong indicator of bushing or sleeve wear. In extreme cases, excessive play can cause gear clash or even prevent gears from fully engaging. During a transmission teardown, visible scoring, galling, or a pronounced wear step on the sleeve F500-A 1802191 confirms the need for replacement.
The main shaft sleeve is not a component that receives routine external maintenance. Its health is tied to the overall care of the transmission. The single most important maintenance practice is regular and timely changes of the high-quality transmission fluid specified by SINOTRUK Howo. Clean, uncontaminated oil provides essential lubrication and cooling, dramatically extending the life of the sleeve and all bearing surfaces.
Proactive replacement is standard during any transmission overhaul, regardless of visible wear. As a relatively inexpensive wear item, replacing the F500-A 1802191 sleeve during a rebuild is a cost-effective way to ensure long-term reliability. Always inspect the mating shaft surface for any damage when replacing the sleeve; a damaged shaft will quickly ruin a new sleeve. For fleet managers, adhering to recommended transmission service intervals is the best strategy to prevent premature sleeve failure.
The SINOTRUK Howo Main Shaft Sleeve, identified by OEM number F500-A 1802191, plays an indispensable role in the smooth and efficient operation of your truck’s transmission. This precisely dimensioned wear component safeguards critical shafts, manages clearances, and ensures reliable lubrication. While small, its condition has a major impact on shifting quality, power loss, and transmission longevity.
For a transmission rebuild that delivers factory-fresh performance and durability, always specify the genuine part number: F500-A 1802191. By choosing this authentic SINOTRUK Howo OEM main shaft sleeve, you make a precise investment in the heart of your drivetrain, ensuring smooth power delivery and maximum service life for the entire transmission assembly.
This technical description is for informational purposes. Always refer to the official SINOTRUK Howo service manual for specific application, installation procedures, and clearance specifications related to part F500-A 1802191.
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