The Track Roller — also known as Bottom Roller or Lower Roller — is a key undercarriage component installed below the track frame of Komatsu D20 crawler bulldozers. It carries the weight of the machine, guides the track chain movement and distributes operating loads evenly to the ground.
During earthmoving, grading and construction operations, track rollers are continuously exposed to impact loads, abrasive soil, rocks and vibration. A worn or damaged roller may cause abnormal track movement, increased chain wear and reduced undercarriage service life.
Our Komatsu D20 track rollers are manufactured according to original dimensional requirements, providing a reliable replacement solution for D20 crawler dozers. Each roller is inspected for hardness, dimensions and sealing performance before delivery.
Wide Compatibility:
Designed for Komatsu D20 crawler bulldozer series, suitable for aftermarket replacement applications.
Single & Double Flange Options:
Available in Single Flange (SF) and Double Flange (DF) configurations to match different positions on the track frame.
Heavy-Duty Alloy Steel Construction:
Manufactured from high-strength 40Mn2 alloy steel with excellent impact resistance and load-bearing capability.
Advanced Heat Treatment:
The roller tread surface is induction hardened to HRC 52-58 with controlled hardening depth, improving wear resistance in harsh working environments.
Reliable Floating Seal System:
Equipped with heavy-duty floating oil seals and high-quality bushings to prevent lubricant leakage and protect internal components from mud, dust and water.
Lifetime Lubrication Design:
Factory lubricated and sealed, reducing maintenance requirements during normal service life.
OEM-Style Replacement Fit:
Produced according to standard drawings with accurate dimensions, mounting holes and shaft specifications for easy installation.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu D20 Bulldozer |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 20X-30-00030 / Confirm by machine serial number |
| Flange Type | Single Flange (SF) / Double Flange (DF) |
| Material | High-strength 40Mn2 Alloy Steel |
| Manufacturing Method | Forging / Casting |
| Surface Hardness | HRC 52-58 |
| Hardening Depth | 5mm - 10mm |
| Sealing | Heavy-duty floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Construction, earthmoving and crawler bulldozer operations |
| Shipping Note | Heavy component — sea freight recommended |
For crawler bulldozers such as Komatsu D20, undercarriage components account for a significant part of operating costs. A high-quality track roller reduces track vibration, prevents premature wear of track chains and improves machine uptime.
Our undercarriage products are manufactured with strict quality control, including material inspection, heat treatment verification, dimensional inspection and sealing performance testing before shipment.
With professional production capability and experience in excavator and bulldozer undercarriage parts, we provide reliable OEM-compatible solutions with competitive pricing and warranty support.
Contact us with your machine model, serial number, existing 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 below the track frame of Komatsu D20 crawler bulldozers. It carries the weight of the machine, guides the track chain movement and distributes operating loads evenly to the ground.
During earthmoving, grading and construction operations, track rollers are continuously exposed to impact loads, abrasive soil, rocks and vibration. A worn or damaged roller may cause abnormal track movement, increased chain wear and reduced undercarriage service life.
Our Komatsu D20 track rollers are manufactured according to original dimensional requirements, providing a reliable replacement solution for D20 crawler dozers. Each roller is inspected for hardness, dimensions and sealing performance before delivery.
Wide Compatibility:
Designed for Komatsu D20 crawler bulldozer series, suitable for aftermarket replacement applications.
Single & Double Flange Options:
Available in Single Flange (SF) and Double Flange (DF) configurations to match different positions on the track frame.
Heavy-Duty Alloy Steel Construction:
Manufactured from high-strength 40Mn2 alloy steel with excellent impact resistance and load-bearing capability.
Advanced Heat Treatment:
The roller tread surface is induction hardened to HRC 52-58 with controlled hardening depth, improving wear resistance in harsh working environments.
Reliable Floating Seal System:
Equipped with heavy-duty floating oil seals and high-quality bushings to prevent lubricant leakage and protect internal components from mud, dust and water.
Lifetime Lubrication Design:
Factory lubricated and sealed, reducing maintenance requirements during normal service life.
OEM-Style Replacement Fit:
Produced according to standard drawings with accurate dimensions, mounting holes and shaft specifications for easy installation.
| Item | Specification / Detail |
|---|---|
| Machine Model | Komatsu D20 Bulldozer |
| Part Type | Track Roller (Bottom Roller / Lower Roller) |
| OEM Part Number | 20X-30-00030 / Confirm by machine serial number |
| Flange Type | Single Flange (SF) / Double Flange (DF) |
| Material | High-strength 40Mn2 Alloy Steel |
| Manufacturing Method | Forging / Casting |
| Surface Hardness | HRC 52-58 |
| Hardening Depth | 5mm - 10mm |
| Sealing | Heavy-duty floating oil seal, lifetime lubricated |
| Mounting | OEM standard, bolt-on direct replacement |
| Application | Construction, earthmoving and crawler bulldozer operations |
| Shipping Note | Heavy component — sea freight recommended |
For crawler bulldozers such as Komatsu D20, undercarriage components account for a significant part of operating costs. A high-quality track roller reduces track vibration, prevents premature wear of track chains and improves machine uptime.
Our undercarriage products are manufactured with strict quality control, including material inspection, heat treatment verification, dimensional inspection and sealing performance testing before shipment.
With professional production capability and experience in excavator and bulldozer undercarriage parts, we provide reliable OEM-compatible solutions with competitive pricing and warranty support.
Contact us with your machine model, serial number, existing part number and roller position to confirm the correct replacement.
