The Track Roller — also known as Bottom Roller or Lower Roller — is a key undercarriage component installed beneath the track frame of Hitachi EX30 crawler excavators.
Unlike large excavators, mini excavators operate frequently in landscaping, rental and urban construction environments where compact size and frequent travelling require reliable undercarriage performance.
The track roller performs several important functions:
A worn track roller may cause:
Our Hitachi EX30 track rollers are manufactured according to OEM-style specifications, providing a reliable aftermarket replacement solution for mini excavator applications.
Designed for:
Reference OEM numbers:
Although used on mini excavators, the roller is manufactured with:
Suitable for:
Manufactured from:
40Mn2 / 50Mn alloy steel
Advantages:
The roller tread surface is hardened:
Provides resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Direct replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Hitachi EX30 Excavator |
| Compatible Models | EX30 / EX30U / EX30UR |
| Machine Class | 3 Ton Mini Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 4340535 / 9106668 / 4719574 |
| Flange Type | Single Flange (SF) |
| Material | High-strength 40Mn2 / 50Mn Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 48-56 |
| Hardening Depth | 4mm - 10mm |
| Sealing | Floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Landscaping, construction and earthmoving |
| Shipping Note | Small component — suitable for air or sea freight |
For mini excavators like Hitachi EX30, undercarriage reliability directly affects machine travelling performance and maintenance cost.
A quality track roller helps:
Every roller produced by our factory undergoes strict inspection:
With professional manufacturing capability for excavator undercarriage parts, we provide OEM-compatible replacement solutions with stable quality, competitive pricing and warranty support.
Contact us with your machine model, serial number, OEM part number and roller position to confirm the correct replacement.
The Track Roller — also known as Bottom Roller or Lower Roller — is a key undercarriage component installed beneath the track frame of Hitachi EX30 crawler excavators.
Unlike large excavators, mini excavators operate frequently in landscaping, rental and urban construction environments where compact size and frequent travelling require reliable undercarriage performance.
The track roller performs several important functions:
A worn track roller may cause:
Our Hitachi EX30 track rollers are manufactured according to OEM-style specifications, providing a reliable aftermarket replacement solution for mini excavator applications.
Designed for:
Reference OEM numbers:
Although used on mini excavators, the roller is manufactured with:
Suitable for:
Manufactured from:
40Mn2 / 50Mn alloy steel
Advantages:
The roller tread surface is hardened:
Provides resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Direct replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Hitachi EX30 Excavator |
| Compatible Models | EX30 / EX30U / EX30UR |
| Machine Class | 3 Ton Mini Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 4340535 / 9106668 / 4719574 |
| Flange Type | Single Flange (SF) |
| Material | High-strength 40Mn2 / 50Mn Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 48-56 |
| Hardening Depth | 4mm - 10mm |
| Sealing | Floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Landscaping, construction and earthmoving |
| Shipping Note | Small component — suitable for air or sea freight |
For mini excavators like Hitachi EX30, undercarriage reliability directly affects machine travelling performance and maintenance cost.
A quality track roller helps:
Every roller produced by our factory undergoes strict inspection:
With professional manufacturing capability for excavator undercarriage parts, we provide OEM-compatible replacement solutions with stable quality, competitive pricing and warranty support.
Contact us with your machine model, serial number, OEM part number and roller position to confirm the correct replacement.
