

The Gears composite member is a comprehensive assembly of precision-engineered components that form the core of the HOWO A7 8X4 transmission. This intricate system includes gears, shafts, bearings, synchronizers, seals, and fasteners, all working together to deliver reliable power transmission and smooth gear changes. The Gears composite member is designed to withstand extreme torque loads and continuous operation in heavy-duty trucking applications.
At howo Parts, we supply a complete Gears composite member that includes every essential subcomponent: Transmission housing, Roller bearing, Pin, Plant bracket assembly, Hex screw M12*1.25, Turqut e sleeve, Output shaft, Glue, Sun gear gasket, Sun roller and shealth assembly, Spine sleeve, Retainer, Sleeve, Sun gear, Planet gear, Block, Roller, Shim, Annular gear, Bracket, Hex bolt, Flat washer, Gear hub assembly, Block sleeve, Syn ring, Syn tooth base, Spring, Spring cage, Syn sleeve, Shaft fork swing block, Shaft fork,
Guide ring assembly, Wave spring washer, Shaft fork support pin, Plate gasket, End plate gasket, PTO shaft cover, Spring washer, Adjust shim, Range worm, O-ring, Piston, Paper gasket, Cylinder, End plate assembly, Connected assembly, Subplate, Press block, Locking plate, Hex held bolt, Cover, Hange plate, Fatten nut, Plug, Locking plate, Roller pin.
Each part is manufactured to original equipment specifications, ensuring perfect fit and consistent performance. The Gears composite member is critical for maintaining transmission efficiency and preventing costly failures. Regular inspection and timely replacement of worn components are essential for long-term reliability.
The Transmission housing is the main casing that encloses and protects all internal transmission components. It is cast from high-strength aluminum or iron, providing rigidity and effective heat dissipation.
The Roller bearing supports rotating shafts with low friction and high load capacity. It ensures smooth operation and extends the life of the transmission.
The Pin is a cylindrical dowel used for precise alignment of housing components. It prevents relative movement and maintains correct assembly geometry.
The Plant bracket assembly forms the support structure for planetary gears, ensuring even load distribution and stable rotation under high torque.
The Hex screw M12*1.25 is a high-strength fastener used to secure critical components. Its fine pitch provides precise clamping force.
The Turqut e sleeve is a protective bushing that reduces friction between moving parts and prevents scoring of shafts.
The Output shaft transfers torque from the transmission to the driveline. It is hardened and ground for maximum durability.
The Glue (thread-locking compound) secures threaded fasteners against loosening under vibration. It is applied to critical bolts and screws.
The Sun gear gasket seals the interface between the sun gear and the carrier, preventing oil leakage and contamination.
This assembly integrates the sun gear with its supporting sleeve, ensuring accurate meshing with planetary gears and efficient power distribution.
The Spine sleeve is a splined coupling that transmits torque while allowing axial movement, essential for smooth gear engagement.
The Retainer is a snap ring that secures components on shafts or in bores, preventing axial displacement during operation.
The Sleeve is a tubular spacer that maintains correct component spacing and protects surfaces from wear.
The Sun gear is the central gear in a planetary set, driving the planet gears and determining the overall gear ratio.
The Planet gear rotates around the sun gear and meshes with the ring gear, providing torque multiplication and speed reduction.
The Block is a spacer or stop that limits axial movement of components, ensuring correct gear alignment and synchromesh operation.
The Roller is a cylindrical element used in bearings to reduce friction and support radial loads efficiently.
The Shim is a thin washer used to adjust axial clearance, ensuring optimal bearing preload and gear mesh.
The Annular gear is the outer ring in a planetary system, fixed to the housing, providing reaction torque for the planet gears.
The Bracket supports and positions the annular gear within the transmission, maintaining concentricity with the sun gear.
The Hex bolt is a standard threaded fastener used throughout the transmission for secure clamping of components.
The Flat washer distributes load under the bolt head, preventing surface damage and ensuring even clamping force.
The Gear hub assembly connects the gear to the shaft, providing a splined interface that transmits torque reliably.
The Block sleeve is a protective cover that shields components from debris and retains lubrication.
The Syn ring is a synchronizer friction ring that equalizes speeds before gear engagement, preventing clash.
The Syn tooth base is the hub of the synchronizer, carrying the blocking teeth and engaging with the syn sleeve.
The Spring provides axial force to synchronizer components, ensuring prompt and positive engagement.
The Spring cage retains and guides the synchronizer springs, maintaining consistent preload and function.
The Syn sleeve slides over the syn tooth base to engage the gear, completing the shift process smoothly.
This component transmits shift fork motion to the synchronizer, converting lever movement into axial displacement.
The Shaft fork is a lever that moves the synchronizer sleeve, selecting gears based on driver input.
The Guide ring assembly directs oil flow to bearings and gears, ensuring adequate lubrication at all times.
The Wave spring washer provides axial preload, maintaining tension in assembled components and reducing play.
This pin pivots the shift fork, providing a stable fulcrum for precise gear selection.
The Plate gasket seals the joint between cover plates, preventing oil leaks and ingress of dirt.
The End plate gasket seals the output shaft end cover, ensuring a leak-proof closure.
The PTO shaft cover protects the power take-off opening, sealing it when not in use.
The Spring washer prevents bolt loosening under vibration, maintaining joint integrity.
The Adjust shim is used to set precise bearing preload or gear backlash, critical for smooth operation.
The Range worm drives the range shift mechanism, enabling splitter and range changes.
The O-ring provides a static seal between mating surfaces, preventing fluid leakage.
The Piston actuates the range shift fork using hydraulic or pneumatic pressure, enabling remote shifting.
The Paper gasket is a compressible sealing element used between machined surfaces to prevent oil seepage.
The Cylinder houses the shift piston, providing a sealed chamber for actuation force.
The End plate assembly closes the transmission rear, housing the output shaft and bearings.
The Connected assembly links the range shift mechanism to the external control, enabling smooth gear changes.
The Subplate is a support plate that distributes loads and provides mounting surfaces for small components.
The Press block applies clamping force to secure components, ensuring they remain in position.
The Locking plate prevents rotation of fasteners or components, using a bent tab or interference fit.
The Hex held bolt is a special bolt with a drilled head for wire locking, used in critical safety applications.
The Cover protects openings from debris, providing a clean interface for auxiliary connections.
The Hange plate is a lifting point for handling the transmission during assembly or service.
The Fatten nut is a heavy-duty nut used on major shafts or studs, providing robust clamping.
The Plug seals unused ports or fill/drain holes, preventing contamination and leaks.
The Roller pin is a hardened pin used in needle bearings, providing a rolling element for low friction.
| Part NO. | Description |
|---|---|
| AZ2210010015 | Transmission housing |
| WG003326020 | Roller bearing |
| Q5280630 | Pin |
| Q5280430 | Pin |
| AZ2303100002 | Plant bracket assembly |
| WG003821255 | Hex screw M12*1.25 |
| WG2215010002 | Plant bracket assembly |
| WG2219010001 | Turqut e sleeve |
| AZ2215100001 | Output shaft |
| AZ2900790721 | Glue |
| WG2219010005 | Sun gear gasket |
| AZ2303100003 | Sun roller and shealth assembly |
| WG2210100002 | Spine sleeve |
| Q43875 | Retainer |
| WG2210100003 | Sleeve |
| WG2210100001 | Sun gear |
| WG2212100001 | Planet gear |
| WG2219010007 | Block |
| WG0033211118 | Roller |
| WG2210100004 | Planet gear |
| WG2219010006 | Shim |
| WG2219010008 | Shim |
| WG0035901056 | Retainer |
| WG0035326322 | Roller bearing |
| WG0035901125 | Retainer |
| WG0035321820 | Roller bearing |
| WG2210100005 | Annular gear |
| WG2210100006 | Bracket |
| WG22190100012 | Retainer |
| Q15081240 | Hex bolt |
| Q40112 | Flat washer |
| WG2219010002 | Turqut e sleeve |
| WG2203100005 | Gear hub assembly |
| WG22190100032 | Block sleeve |
| WG2210100009 | Syn ring |
| WG2210100007 | Syn tooth base |
| WG2219020001 | Block |
| WG2219020002 | Spring |
| WG2219020003 | Spring cage |
| WG0035901130 | Retainer |
| WG2210100008 | Syn sleeve |
| WG22190100042 | Shaft fork swing block |
| WG2214100001 | Shaft fork |
| WG2203100006 | Gear hub assembly |
| WG2203100007 | Guide ring assembly |
| WG0035900024 | Wave spring washer |
| WG22190100043 | Shaft fork support pin |
| WG22190100048 | Plate gasket |
| WG22190100041 | End plate gasket |
| WG22190100047 | PTO shaft cover |
| Q15081216 | Hex bolt |
| Q40312 | Spring washer |
| WG0003350218 | Roller bearing |
| JZ2208100003 | Adjust shim |
| WG22190100035 | Adjust shim |
| WG22190100036 | Adjust shim |
| WG22190100037 | Adjust shim |
| WG2210100015 | Range worm |
| WG0003072503 | O-ring |
| WG0003071700 | O-ring |
| WG22190100050 | Piston |
| WG0003076900 | O-ring |
| JZ20083870016 | Hex nut |
| WG22192100049 | Paper gasket |
| WG22192100009 | Cylinder |
| Q150B1065 | Hex bolt |
| Q40310 | Spring washer |
| JZ2203100008 | End plate assembly |
| WG22192100001 | End plate assembly |
| WG22192100019 | Connected assembly |
| Q150B1055 | Hex bolt |
| JZ20083070105 | Hex bolt |
| WG22190100052 | Subplate |
| WG22190100054 | Press block |
| WG22190100174 | Subplate |
| WG22190100173 | Locking plate |
| JZ0907990001 | Glue |
| Q170B1055 | Hex held bolt |
| Q40310 | Spring washer |
| JZ0907970242 | Glue |
| WG22190100072 | Press block |
| WG22190100073 | bolt |
| Q150B0820 | Hex bolt |
| JZ2219100075 | Cover |
| Q40310 | Spring washer |
| JZ0907970271 | Glue |
| WG22190100062 | Paper gasket |
| WG2219100061 | Hange plate |
| Q150B1050 | Hex bolt |
| Q150B1060 | Hex bolt |
| Q40310 | Spring washer |
| WG2219100011 | Fatten nut |
| WG22191000171 | Plug |
| WG2219100074 | Locking plate |
| WG2214100002 | Shaft fork |
| WG0036700800 | O-ring |
| WG003801187 | bolt |
| WG0036700800 | O-ring |
| WG003801058 | Hex bolt |
| WG003673150 | O-ring |
| WG0033451538 | Roller pin |
Every component in our Gears composite member is produced to the same rigorous standards as the original equipment. We use premium alloy steels, precision heat treatment, and strict dimensional control to ensure long service life and reliable performance.
Our Gears composite member incorporates modern gear design, optimized tooth profiles, and high-efficiency bearings to reduce friction, noise, and fuel consumption. The result is a smoother, more responsive transmission.
We supply the Gears composite member as a complete kit, including all necessary shims, seals, and fasteners. This simplifies ordering, reduces assembly errors, and speeds up your rebuild process.
Our extensive inventory ensures fast shipping worldwide, and our experienced technical team is available to assist with installation queries. We are committed to keeping your HOWO A7 8X4 on the road.
The Gears composite member is the heart of the transmission. Any wear or damage to its components—from the Sun gear to the Roller bearing—can lead to poor shifting, excessive noise, and even catastrophic failure. Regular inspection and using genuine parts are essential for reliability.
Our Gears composite member components are designed to handle high thermal loads. The Transmission housing dissipates heat effectively, while the Roller bearings and O-rings maintain proper lubrication and sealing under extreme temperatures.
When assembling the Gears composite member, always use new gaskets, O-rings, and locking compounds. Torque all fasteners to the specified values. Adjust shim thickness carefully to achieve correct bearing preload and gear backlash.
We recommend a full inspection of the Gears composite member every 150,000 km. Replace any worn bearings, synchronizer rings, or seals. Use genuine Glue and thread-lockers to ensure fasteners remain secure.
Our Gears composite member is specifically designed for the HOWO A7 8X4 transmission, fitting all variants with manual or automated shifting. All dimensions and spline counts match the original factory parts.
Every part in our Gears composite member is traceable and comes with a full warranty. We test each batch for hardness, dimensional accuracy, and fatigue resistance, ensuring you receive only the best.
We maintain a large stock of all Gears composite member components, allowing us to ship orders within 24 hours. Bulk orders and custom kits are available for fleet customers.
Investing in a high-quality Gears composite member from howo Parts reduces the total cost of ownership by minimizing transmission breakdowns and extending overhaul intervals. Choose reliability, choose durability.
Our online catalog provides comprehensive access to genuine SINOTRUK parts for all major vehicle lines — including HOWO, Sitrak, Steyr, and Yellow River series trucks. You can browse detailed specifications, original part numbers, and exploded-view diagrams for every assembly. Whether you are performing routine maintenance or planning a major overhaul, the catalog helps you quickly identify the correct components for your vehicle. When you become a SINOTRUK customer, we offer complimentary full‑access catalog services, ensuring you always have the latest product data and interchangeability information at your fingertips to support efficient fleet management and accurate parts ordering.