Idle gear composite member
Idle Gear Composite Member for HOWO A7 8X4
2026-07-09
Gears composite member
Gears Composite Member for HOWO A7 8X4
2026-07-09
Gears Composite Member – HOWO A7 8X4

Gears Composite Member for HOWO A7 8X4

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.

Transmission housing

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.

Roller bearing

The Roller bearing supports rotating shafts with low friction and high load capacity. It ensures smooth operation and extends the life of the transmission.

Pin

The Pin is a cylindrical dowel used for precise alignment of housing components. It prevents relative movement and maintains correct assembly geometry.

Plant bracket assembly

The Plant bracket assembly forms the support structure for planetary gears, ensuring even load distribution and stable rotation under high torque.

Hex screw M12*1.25

The Hex screw M12*1.25 is a high-strength fastener used to secure critical components. Its fine pitch provides precise clamping force.

Turqut e sleeve

The Turqut e sleeve is a protective bushing that reduces friction between moving parts and prevents scoring of shafts.

Output shaft

The Output shaft transfers torque from the transmission to the driveline. It is hardened and ground for maximum durability.

Glue

The Glue (thread-locking compound) secures threaded fasteners against loosening under vibration. It is applied to critical bolts and screws.

Sun gear gasket

The Sun gear gasket seals the interface between the sun gear and the carrier, preventing oil leakage and contamination.

Sun roller and shealth assembly

This assembly integrates the sun gear with its supporting sleeve, ensuring accurate meshing with planetary gears and efficient power distribution.

Spine sleeve

The Spine sleeve is a splined coupling that transmits torque while allowing axial movement, essential for smooth gear engagement.

Retainer

The Retainer is a snap ring that secures components on shafts or in bores, preventing axial displacement during operation.

Sleeve

The Sleeve is a tubular spacer that maintains correct component spacing and protects surfaces from wear.

Sun gear

The Sun gear is the central gear in a planetary set, driving the planet gears and determining the overall gear ratio.

Planet gear

The Planet gear rotates around the sun gear and meshes with the ring gear, providing torque multiplication and speed reduction.

Block

The Block is a spacer or stop that limits axial movement of components, ensuring correct gear alignment and synchromesh operation.

Roller

The Roller is a cylindrical element used in bearings to reduce friction and support radial loads efficiently.

Shim

The Shim is a thin washer used to adjust axial clearance, ensuring optimal bearing preload and gear mesh.

Annular gear

The Annular gear is the outer ring in a planetary system, fixed to the housing, providing reaction torque for the planet gears.

Bracket

The Bracket supports and positions the annular gear within the transmission, maintaining concentricity with the sun gear.

Hex bolt

The Hex bolt is a standard threaded fastener used throughout the transmission for secure clamping of components.

Flat washer

The Flat washer distributes load under the bolt head, preventing surface damage and ensuring even clamping force.

Gear hub assembly

The Gear hub assembly connects the gear to the shaft, providing a splined interface that transmits torque reliably.

Block sleeve

The Block sleeve is a protective cover that shields components from debris and retains lubrication.

Syn ring

The Syn ring is a synchronizer friction ring that equalizes speeds before gear engagement, preventing clash.

Syn tooth base

The Syn tooth base is the hub of the synchronizer, carrying the blocking teeth and engaging with the syn sleeve.

Spring

The Spring provides axial force to synchronizer components, ensuring prompt and positive engagement.

Spring cage

The Spring cage retains and guides the synchronizer springs, maintaining consistent preload and function.

Syn sleeve

The Syn sleeve slides over the syn tooth base to engage the gear, completing the shift process smoothly.

Shaft fork swing block

This component transmits shift fork motion to the synchronizer, converting lever movement into axial displacement.

Shaft fork

The Shaft fork is a lever that moves the synchronizer sleeve, selecting gears based on driver input.

Guide ring assembly

The Guide ring assembly directs oil flow to bearings and gears, ensuring adequate lubrication at all times.

Wave spring washer

The Wave spring washer provides axial preload, maintaining tension in assembled components and reducing play.

Shaft fork support pin

This pin pivots the shift fork, providing a stable fulcrum for precise gear selection.

Plate gasket

The Plate gasket seals the joint between cover plates, preventing oil leaks and ingress of dirt.

End plate gasket

The End plate gasket seals the output shaft end cover, ensuring a leak-proof closure.

PTO shaft cover

The PTO shaft cover protects the power take-off opening, sealing it when not in use.

Spring washer

The Spring washer prevents bolt loosening under vibration, maintaining joint integrity.

Adjust shim

The Adjust shim is used to set precise bearing preload or gear backlash, critical for smooth operation.

Range worm

The Range worm drives the range shift mechanism, enabling splitter and range changes.

O-ring

The O-ring provides a static seal between mating surfaces, preventing fluid leakage.

Piston

The Piston actuates the range shift fork using hydraulic or pneumatic pressure, enabling remote shifting.

Paper gasket

The Paper gasket is a compressible sealing element used between machined surfaces to prevent oil seepage.

Cylinder

The Cylinder houses the shift piston, providing a sealed chamber for actuation force.

End plate assembly

The End plate assembly closes the transmission rear, housing the output shaft and bearings.

Connected assembly

The Connected assembly links the range shift mechanism to the external control, enabling smooth gear changes.

Subplate

The Subplate is a support plate that distributes loads and provides mounting surfaces for small components.

Press block

The Press block applies clamping force to secure components, ensuring they remain in position.

Locking plate

The Locking plate prevents rotation of fasteners or components, using a bent tab or interference fit.

Hex held bolt

The Hex held bolt is a special bolt with a drilled head for wire locking, used in critical safety applications.

Cover

The Cover protects openings from debris, providing a clean interface for auxiliary connections.

Hange plate

The Hange plate is a lifting point for handling the transmission during assembly or service.

Fatten nut

The Fatten nut is a heavy-duty nut used on major shafts or studs, providing robust clamping.

Plug

The Plug seals unused ports or fill/drain holes, preventing contamination and leaks.

Roller pin

The Roller pin is a hardened pin used in needle bearings, providing a rolling element for low friction.

Gears composite member for HOWO A7 8X4

Product Parameters of Gears composite member

Part NO.Description
AZ2210010015Transmission housing
WG003326020Roller bearing
Q5280630Pin
Q5280430Pin
AZ2303100002Plant bracket assembly
WG003821255Hex screw M12*1.25
WG2215010002Plant bracket assembly
WG2219010001Turqut e sleeve
AZ2215100001Output shaft
AZ2900790721Glue
WG2219010005Sun gear gasket
AZ2303100003Sun roller and shealth assembly
WG2210100002Spine sleeve
Q43875Retainer
WG2210100003Sleeve
WG2210100001Sun gear
WG2212100001Planet gear
WG2219010007Block
WG0033211118Roller
WG2210100004Planet gear
WG2219010006Shim
WG2219010008Shim
WG0035901056Retainer
WG0035326322Roller bearing
WG0035901125Retainer
WG0035321820Roller bearing
WG2210100005Annular gear
WG2210100006Bracket
WG22190100012Retainer
Q15081240Hex bolt
Q40112Flat washer
WG2219010002Turqut e sleeve
WG2203100005Gear hub assembly
WG22190100032Block sleeve
WG2210100009Syn ring
WG2210100007Syn tooth base
WG2219020001Block
WG2219020002Spring
WG2219020003Spring cage
WG0035901130Retainer
WG2210100008Syn sleeve
WG22190100042Shaft fork swing block
WG2214100001Shaft fork
WG2203100006Gear hub assembly
WG2203100007Guide ring assembly
WG0035900024Wave spring washer
WG22190100043Shaft fork support pin
WG22190100048Plate gasket
WG22190100041End plate gasket
WG22190100047PTO shaft cover
Q15081216Hex bolt
Q40312Spring washer
WG0003350218Roller bearing
JZ2208100003Adjust shim
WG22190100035Adjust shim
WG22190100036Adjust shim
WG22190100037Adjust shim
WG2210100015Range worm
WG0003072503O-ring
WG0003071700O-ring
WG22190100050Piston
WG0003076900O-ring
JZ20083870016Hex nut
WG22192100049Paper gasket
WG22192100009Cylinder
Q150B1065Hex bolt
Q40310Spring washer
JZ2203100008End plate assembly
WG22192100001End plate assembly
WG22192100019Connected assembly
Q150B1055Hex bolt
JZ20083070105Hex bolt
WG22190100052Subplate
WG22190100054Press block
WG22190100174Subplate
WG22190100173Locking plate
JZ0907990001Glue
Q170B1055Hex held bolt
Q40310Spring washer
JZ0907970242Glue
WG22190100072Press block
WG22190100073bolt
Q150B0820Hex bolt
JZ2219100075Cover
Q40310Spring washer
JZ0907970271Glue
WG22190100062Paper gasket
WG2219100061Hange plate
Q150B1050Hex bolt
Q150B1060Hex bolt
Q40310Spring washer
WG2219100011Fatten nut
WG22191000171Plug
WG2219100074Locking plate
WG2214100002Shaft fork
WG0036700800O-ring
WG003801187bolt
WG0036700800O-ring
WG003801058Hex bolt
WG003673150O-ring
WG0033451538Roller pin

Why Choose Our Gears composite member?

OEM Grade Quality

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.

Advanced Engineering

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.

Comprehensive Kit for Easy Overhaul

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.

Global Availability & Technical Support

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.

Importance of a Well-Maintained Gears Composite Member

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.

Thermal and Stress Management

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.

Installation Best Practices

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.

Recommended Service Intervals

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.

Compatibility with HOWO A7 8X4

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.

Quality Assurance

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.

Fast Delivery and Order Flexibility

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.

Long-Term Cost Savings

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.

Genuine Gears composite member for HOWO A7 8X4 • Complete kit with all bearings, gears, shims, seals • OEM-quality, engineered for longevity

Online Catalog of SINOTRUK Parts

Learn More

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.

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