The Track Roller — also known as Bottom Roller or Lower Roller — is an essential undercarriage component installed beneath the track frame of Komatsu PC40-7 crawler excavators.
The roller supports the machine weight, maintains track chain alignment and ensures stable crawler movement during travelling and excavation operations.
For a compact excavator, the track roller is exposed to:
A worn or damaged track roller may cause:
Our Komatsu PC40-7 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for mini excavator dealers, rental fleets and repair workshops.
Designed for:
Reference OEM numbers:
Although used on mini excavators, the roller is manufactured with:
Suitable for:
Manufactured from:
40Mn2 Alloy Steel
Advantages:
The roller tread surface is hardened:
Improves resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Provides direct bolt-on replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu PC40-7 Excavator |
| Compatible Models | PC40-7 / PC40 / PC45 / PC50UU |
| Machine Class | 4 Ton Mini Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 20T-30-00070 / 20T-30-00171 / 20T-30-00172 / 20T-30-00173 |
| Flange Type | Single Flange (SF) / Inner Flange (IF) |
| Material | High-strength 40Mn2 Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 50-58 |
| Hardening Depth | 4mm - 8mm |
| Sealing | Floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Mini excavator, construction and landscaping |
| Shipping Note | Small component — suitable for air or sea freight |
For mini excavators like Komatsu PC40-7, reliable undercarriage components help maintain machine performance and reduce maintenance frequency.
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 an essential undercarriage component installed beneath the track frame of Komatsu PC40-7 crawler excavators.
The roller supports the machine weight, maintains track chain alignment and ensures stable crawler movement during travelling and excavation operations.
For a compact excavator, the track roller is exposed to:
A worn or damaged track roller may cause:
Our Komatsu PC40-7 track rollers are manufactured according to OEM-style drawings, providing reliable aftermarket replacement solutions for mini excavator dealers, rental fleets and repair workshops.
Designed for:
Reference OEM numbers:
Although used on mini excavators, the roller is manufactured with:
Suitable for:
Manufactured from:
40Mn2 Alloy Steel
Advantages:
The roller tread surface is hardened:
Improves resistance against:
Equipped with:
Designed to prevent:
Manufactured with:
Provides direct bolt-on replacement without modification.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu PC40-7 Excavator |
| Compatible Models | PC40-7 / PC40 / PC45 / PC50UU |
| Machine Class | 4 Ton Mini Excavator |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 20T-30-00070 / 20T-30-00171 / 20T-30-00172 / 20T-30-00173 |
| Flange Type | Single Flange (SF) / Inner Flange (IF) |
| Material | High-strength 40Mn2 Alloy Steel |
| Manufacturing Method | Forging / Casting / Machining |
| Surface Hardness | HRC 50-58 |
| Hardening Depth | 4mm - 8mm |
| Sealing | Floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Mini excavator, construction and landscaping |
| Shipping Note | Small component — suitable for air or sea freight |
For mini excavators like Komatsu PC40-7, reliable undercarriage components help maintain machine performance and reduce maintenance frequency.
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.
