Views: 0 Author: Suzhou Jestin Machinery Co., Ltd. Publish Time: 2026-06-10 Origin: Suzhou Jestin Machinery Co., Ltd.
Every smooth, durable asphalt road starts with one machine: the asphalt paver. This specialized piece of equipment takes hot mix asphalt from trucks and lays it down in a uniform layer—at the right thickness, width, and profile—ready for compaction by rollers.
But what actually makes up an asphalt paver? How does it take a pile of loose aggregate and turn it into a perfectly flat road surface?
In this guide, we'll break down the main components and systems of a modern asphalt paver. Whether you're an operator, a maintenance manager, or a parts buyer, understanding how these machines work will help you keep them running efficiently—and know exactly what to replace when things wear out.
Asphalt pavers come in two main configurations:
Tire pavers — mounted on rubber tires, offering better mobility between job sites
Track pavers — mounted on tracks, providing better traction and stability for large, heavy-duty paving projects
Both types perform the same basic function, but track pavers are generally preferred for high-production highway work where stability and flotation are critical.
Paver model numbers typically follow a pattern: brand letters + width number + design series. For example, a model number like LTU1200 indicates the brand and maximum paving width (approximately 1200 mm or 1.2 meters).
Every asphalt paver consists of three major systems working together:
Engine — provides power for all systems
Chassis / Undercarriage — supports the machine and provides mobility
Working attachments — the components that actually handle, spread, and level the asphalt
For high-grade highway paving, an additional automatic leveling system is also fitted to achieve the strict smoothness requirements.
The drive system powers the paver's movement. Modern pavers use one of three drive types:
Mechanical drive — older technology, simpler but less flexible
Full hydraulic drive — uses hydraulic motors and pumps for infinitely variable speed control
Hydro-mechanical drive — combines hydraulic and mechanical elements
Most modern pavers use fully hydraulic drive systems, which allow the operator to adjust travel speed independently of engine RPM. This is critical for maintaining consistent paving speed regardless of load.
The hydraulic drive system typically includes variable-displacement pumps, hydraulic motors, planetary gear reducers, and final drives at the wheels or tracks.
This is where the asphalt mix starts its journey through the machine. The feed system has three main components.
Located at the front of the paver, the hopper receives hot mix asphalt from the dump truck. It's designed with a wide opening to accommodate truck discharge and sloping sides to guide material toward the conveyor.
The conveyor moves material from the hopper to the auger area:
Drive shaft with drive sprockets
Tension shaft with idler sprockets
Conveyor chains with scraper bars attached
Support rollers
The chains pull the scraper bars across the conveyor floor, carrying the asphalt mix forward in a controlled flow. Independent hydraulic drives on each side allow the operator to adjust the feed rate independently for each side.
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Also called the spiral spreader or auger assembly, this component receives material from the conveyor and spreads it evenly across the full paving width.
The auger typically consists of left and right sections with opposite spiral directions but rotating in the same direction. This arrangement pushes material from the center outward to the edges of the screed.
Each auger section is independently driven, allowing the operator to adjust material distribution based on paving conditions.
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This is where the magic happens—turning loose mix into a smooth, compacted mat.
The tamper bar is a plate structure located just ahead of the screed. It moves up and down rapidly, pre-compacting the asphalt material before the screed passes over it.
There are two main configurations:
Single tamper — one tamper bar for basic pre-compaction
Double tamper — two tamper bars (a pre-tamper and a main tamper) with adjustable amplitude for higher compaction
On double tamper systems, the two bars are mounted on the same eccentric shaft but 180° out of phase. This provides more consistent compaction and reduces the number of passes needed from the roller.
The screed is the heart of the paving operation. Its job is to take the loose material from the auger and spread it to the specified width, crown, and thickness—while also providing initial compaction.
The screed assembly consists:
Main screed plates — the primary leveling surface
Extension sections — for adjustable paving width
Older pavers use bolt-on extensions that must be manually added or removed. Modern pavers use hydraulic telescopic extensions that can be extended or retracted during operation—allowing the operator to change paving width on the fly.
High-end pavers also feature vibration on the screed. The vibratory screed adds a high-frequency, low-amplitude vibration to the screed plate:
Improves material density before the roller passes
Reduces the number of roller passes needed
Produces a smoother surface finish
One of the most important concepts in asphalt paving is the floating screed.
The screed is attached to the paver frame via the tractor arms and lifting cylinders. When the screed is in working position, the lifting cylinders are placed in "float" mode—allowing the screed to move up and down freely.
The floating screed has three key characteristics:
1. Level surface. When the base course is smooth and external forces on the screed are constant, the screed maintains a constant angle—producing a perfectly flat mat.
2. Smooths out bumps. When the base course has short-wavelength irregularities, the screed doesn't follow every bump exactly—it averages them out, producing a smoother surface than the base below it.
3. Reduces transmission of bumps. The floating action minimizes the transfer of base course irregularities to the new surface, resulting in a smoother final ride.
This "averaging" effect is the reason asphalt pavers can produce such smooth surfaces even when the base course is less than perfect.
The paving thickness is controlled by adjusting the screed angle.
When the screed angle is increased (front edge higher), the screed rides up, laying a thicker mat. When the screed angle is decreased (front edge lower), it lays a thinner mat.
The adjustment is made using manual or hydraulic thickness controls located on the tractor arms. On modern pavers, this adjustment is often automated through the leveling system.
To achieve the high smoothness standards required for modern highways, pavers are equipped with an automatic leveling (auto-grade) system.
This system dramatically improves the paver's ability to produce a smooth surface—far beyond what the operator can achieve manually.
Here's the key insight: the floating screed doesn't just smooth out bumps—it can also amplify them if not controlled properly.
When the paver travels over a bump and the tractor arm hinge point rises by H, the screed rotates slightly. This rotation causes the screed front edge to lift by a certain amount.
First pass: the screed front edge lifts by (b/a) × H
Second pass (over the same area): the error is multiplied again—(b/a)² × H
Third pass: the error becomes (b/a)³ × H
This "error amplification" is why even small bumps in the base course can lead to significant surface irregularities if not corrected. The automatic leveling system uses sensors to detect these errors and adjust the screed angle in real time—preventing the error from multiplying.
Sensors (typically ultrasonic, mechanical, or laser) measure the height of the paver relative to a reference (stringline, existing surface, or laser plane)
The controller compares the measured value to the target value
The hydraulic system adjusts the screed angle to correct any deviation
This correction happens continuously as the paver moves forward
Modern pavers are highly automated, relying on integrated electro-hydraulic control systems to manage multiple functions simultaneously.
The paver has several independent hydraulic circuits:
Drive system — independent left/right track drive circuits for precise steering
Conveyor drive — hydraulic motors control each scraper conveyor independently
Auger drive — independent left/right auger drives with variable speed control
Screed vibration — gear pump provides flow to vibratory motors
Screed lift — hydraulic cylinders raise/lower the screed, with float mode for paving
The electrical control system manages:
Vehicle electrical system — lights, indicators, starting
Drive control — travel speed, steering
Feed control — automatic material feed regulation (automatic mode) or manual override
Leveling control — automatic grade and slope control (closed-loop electro-hydraulic system)
Screed heating — three types: gas, fuel-oil, or electric heating elements
The automatic feed control system adjusts the conveyor and auger speeds based on the paver's travel speed and material demand—ensuring consistent material supply without operator intervention.
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Like any heavy equipment, pavers have components that wear out over time. The most commonly replaced items include:
Component | Wear points | Replacement frequency |
Conveyor chains & scrapers | Chain stretch, scraper wear, pin/bushing wear | 500–1500 hours depending on material |
Auger blades | Edge wear, erosion from abrasive mix | 500–2000 hours |
Screed plates | Bottom surface wear, edge rounding | 1000–3000 hours |
Tamper bars | Wear on the bottom edge | 500–1500 hours |
Wear strips & guide plates | Abrasion from material flow | As needed based on inspection |
At Jestin, we understand that keeping your paver running means having the right parts when you need them.
Scraper conveyor chains — 40Mn wear-resistant steel, 35 HRC chain hardness, 100% tensile-tested
Auger blades — high-wear materials for long life in abrasive asphalt
Screed plates — precision-fit replacements for Vögele, Dynapac, SANY, XCMG, and more
Screed wear parts — including tampers, wear strips, and guide plates
Leveling system sensors — compatible replacements for major auto-grade systems
With over 12 years of industry experience, we offer reliable parts at competitive prices—backed by fast delivery and responsive support.
Looking for a replacement conveyor chain for your asphalt paver?
We offer high-quality conveyor chains compatible with Vögele, Dynapac, Volvo ABG, Caterpillar, SANY, XCMG, and other major paver brands — built to last with 40Mn wear-resistant steel and 100% tensile-tested.
Get a quick quote: Send us your paver model and chain specifications — we'll reply within 24 hours.
Contact Us：
Lily / International Sales
Suzhou Jestin Machinery Technology Co., Ltd.
Tel / WhatsApp: +86 17883011513
Contact our team today and keep your paving operation running smoothly with reliable conveyor chains that deliver.
