The performance of a drilling rig is inextricably linked to the integrity of its crawler system. Whether it is a rotary drilling rig, a horizontal directional drill (HDD), or a localized piling machine, the undercarriage serves as the critical interface between the heavy machinery and the unpredictable terrain. At Shengde Machinery, with our 26-year heritage as a direct manufacturer, we recognize that selecting the right undercarriage is not just a procurement decision—it is an engineering necessity to ensure operational safety and machine longevity.
The Critical Role of the Undercarriage in Drilling Operations
Unlike standard excavators that primarily handle digging forces, a drilling rig undercarriage must manage unique stress profiles. During operation, these machines exert immense vertical pressure and torque. A poorly selected undercarriage can lead to structural deformation, hydraulic motor misalignment, or, in the worst-case scenario, machine tipping.
The primary goal of undercarriage selection is to achieve the perfect balance between load capacity, stability, and maneuverability. This balance is dictated by specific technical parameters, most notably the track pitch, overall dimensions, and material composition.
Understanding the SDD Series: Engineering Precision from 101mm to 216mm Pitch
Our SDD Series is specifically pre-designed to meet the diverse demands of the drilling industry. By analyzing our technical data, we can see how different specifications cater to various machine tonnages and applications:
1. Compact and Agile: The 101mm–135mm Pitch Range
For smaller exploration rigs or compact piling machines, agility is key.
- The SDD101 Series: With a 101mm pitch and a track width (Dimension D) of 250mm, these units are designed for lightweight rigs that require a smaller footprint while maintaining steady ground contact.
- The SDD135 Range: This is our most versatile category, offering multiple configurations. For instance, the SDD135-01005 features a massive axle center (Dimension A) of 3458mm, providing an extended wheelbase for machines that require extra stability during transport over uneven construction sites.
2. Mid-Range Power: The 140mm–160mm Pitch Range
Mid-sized drilling rigs require a significant jump in structural reinforcement.
- The SDD140 & SDD160: These models bridge the gap between portability and power. With track widths increasing to 400mm and total lengths (Dimension B) reaching nearly 4 meters, they provide the necessary “platform stability” for rotary drills operating in medium-density soils.
3. Heavy-Duty Dominance: The 190mm–216mm Pitch Range
When dealing with payloads exceeding 50 to 100 tons, the undercarriage must be a titan of engineering.
- The SDD216-10001: This is the flagship of our drilling sideframe lineup. It boasts a pitch of 216mm and an incredible axle center distance of 6780mm. With a track width of 600mm, it is engineered to disperse the massive static loads of heavy-duty piling rigs, ensuring the machine remains perfectly level even under maximum drilling torque.
| NO. | Model | Pitch | A | B | C | D |
| 01 | SDD101-00301 | 101 | 1358.5 | 883 | 485 | 250 |
| 02 | SDD101-00401 | 101 | 1612.5 | 1137 | 485 | 250 |
| 03 | SDD135-01006 | 135 | 2400 | 1584.7 | 576.8 | 260 |
| 04 | SDD135-00602 | 135 | 2313.7 | 1755 | 570.6 | 300 |
| 05 | SDD135-00603 | 135 | 2601.6 | 1957 | 746.5 | 300 |
| 06 | SDD135-00604 | 135 | 1737 | 1180 | 574 | 250 |
| 07 | SOD135-01005 | 135 | 3458 | 2871.6 | 578 | 250 |
| 08 | SDD135-00607 | 135 | 2943.6 | 2299 | 746.5 | 300 |
| 09 | SDD140-00801 | 140 | 3072 | 2489 | 608 | 400 |
| 10 | SDD154-01004 | 154 | 3098 | 2460 | 638 | 330 |
| 11 | SDD160-01801 | 160 | 4672 | 3948 | 735 | 400 |
| 12 | SDD190-02701 | 190 | 4446 | 3650 | 925 | 600 |
| 13 | SDD216-10001 | 216 | 6780 | 5765 | 1075 | 600 |
The Material Advantage: 50MnB and Heat Treatment
At Shengde Machinery, we don’t just assemble parts; we craft them from high-strength 50MnB or 40Mn2 alloy steel. The undercarriage of a drilling rig is often submerged in mud, water, and abrasive rock dust. To combat this, our components undergo an overall heat treatment process, followed by deep induction hardening of the sprocket teeth and roller paths to a hardness of HRC 52-58. This ensures that the track chain and drive wheels can withstand the unique torque demands of compact and heavy-duty track loaders alike.
Technical Selection: The “Precision Fit” Process
Choosing an undercarriage from a catalog is only the first step. To guarantee a 100% precision fit, we emphasize the following technical dimensions:
- Dimension A (Axle Centers): This determines the stability of your rig’s center of gravity.
- Dimension B (Total Length): Critical for ensuring the rig fits on transport trailers and navigates tight sites.
- Dimension C (Drive Height): Essential for matching the hydraulic motor’s output torque to the undercarriage’s gear ratio.
- Dimension D (Track Width): Used to calculate ground pressure (PSI/kPa) to prevent the rig from sinking in soft clay or swampy conditions.
Our purchase process is designed to eliminate risk. We provide a specialized parameter table for your team to complete, followed by a 1-on-1 technical drawing confirmation by our engineering department.
Why Partner with Us?
With 26 years of manufacturing excellence, Shengde Machinery provides more than just hardware. We provide a ready-to-mount solution that integrates seamlessly with your machinery. By selecting from our SDD Series, you are choosing a market-proven manufacturing process and a partner committed to lifetime technical assistance.
From the compact 101mm pitch to the heavy-duty 216mm pitch, we have the pre-designed data and the custom fabrication capability to support your next project.
Ready to optimize your drilling rig’s stability? Review our SDD dimension table today and contact our technical experts to begin your custom design scheme. Together, we will build a foundation that never fails.
