Product Description

AZ9970340070 Sun Gear Circlip Wheel Hub Assembly is installed inside the wheel side reduction system of SINOTRUK HOWO mining dump truck drive axles. It secures the planetary sun gear position and prevents gear displacement during heavy-load mining operation and extreme torque conditions.

Circlip deformation, improper installation, or metal fatigue may cause sun gear movement, abnormal gear meshing, wheel hub noise, planetary gear damage, and axle transmission failure.

This component is widely used in mining dump truck maintenance, heavy-duty axle overhaul, engineering machinery repair, and export aftermarket axle system service.

Product Overview

This sun gear circlip wheel hub assembly is commonly used on SINOTRUK HOWO 70 mining dump trucks equipped with wheel reduction drive axles for mining transport, quarry operation, and heavy-load off-road applications.

Technical Parameters

Fitment Models

• SINOTRUK HOWO 70 Mining Dump Truck

• HOWO Mining 6x4 Dump Truck

• HOWO Mining 8x4 Dump Truck

Fitment Verification

Please verify before purchase:

• VIN

• OEM No

• Axle model

• Wheel reduction structure

• Circlip outer diameter

• Groove width

• Sun gear specification

• Axle ratio

• Installation position

• Serial plate

OEM Cross Verification (Only SINOTRUK / SHACMAN / FAW / Weichai)

Direct Fit

• HOWO 70 mining wheel reduction axles

• SINOTRUK planetary hub reduction systems

• HOWO mining dump truck rear drive hubs

Can Be Adapted

• Some SHACMAN mining axle platforms after dimension verification

• Engineering machinery reduction hubs depending on groove size

Similar But Not Compatible

• Standard road truck axle circlips

• Different groove-width retaining rings

• Non-wheel reduction axle systems

• Different planetary gear structures

Common Field Failure Case

Case 1

Vehicle: HOWO 70 Mining Dump Truck
Mileage: 320,000 KM
Problem: Abnormal rear axle grinding noise
Root Cause: Sun gear circlip deformation caused gear displacement
Solution: Replaced AZ9970340070 circlip and inspected planetary gears
Loss / Benefit: Prevented wheel reduction gear damage and reduced axle overhaul cost

Case 2

Vehicle: HOWO Mining 8x4 Dump Truck
Mileage: 410,000 KM
Problem: Wheel hub overheating during mining transport
Root Cause: Loose circlip caused abnormal gear meshing friction
Solution: Installed OE-standard retaining circlip assembly
Loss / Benefit: Restored stable axle operation and reduced downtime

Case 3

Vehicle: Export Mining Fleet Procurement
Mileage: Fleet Service Application
Problem: Wrong circlip diameter supplied
Root Cause: Different axle generation mismatch
Solution: Verified axle model and groove dimensions before shipment
Loss / Benefit: Avoided installation failure and repeat export freight

Wrong Part & Export Transport Risk Control

Supplier Stability & Procurement Value

Stable supply of AZ9970340070 helps:

• Reduce wrong-part delivery risk

• Lower mining axle downtime

• Reduce repeated wheel hub repairs

• Improve axle transmission stability

• Reduce repeat sea freight expenses

• Improve mining fleet uptime

• Support stable bulk procurement

• Ensure consistent export delivery cycles

Related Truck Parts

Directly Associated Parts

• AZ9970340015 Planetary Sun Gear

• AZ9970340020 Planetary Gear

• AZ9970340035 Wheel Hub Reduction Housing

Same System Parts

• AZ9981320030 Rear Drive Axle Assembly

• WG9981340125 Differential Assembly

• AZ9970340065 Wheel Hub Bearing

Frequently Ordered Together

• Wheel hub oil seal

• Planetary gear washer

• Axle locking nut

• Reduction hub gasket

Often Forgotten Parts

• Circlip pliers groove washer

• Bearing spacer

• Lock washer

• Gear retaining shim

Contact

William Du
Heavy Truck Spare Parts Supply
SINOTRUK | SHACMAN | FAW | Weichai Export Parts
WhatsApp / WeChat: +86 19050562894
Email: Sales22@chinatruck.cc