Crane Bottom Roller
30 Years of Experience – Engineering Safety & Reliability into Every Crawler Crane Undercarriage Parts.
What are crawler crane bottom rollers?
Crawler crane bottom rollers, also known as track rollers or lower rollers, are the core load-bearing parts of the crane undercarriage. They are typically installed at the bottom of the track crane's underframe, evenly distributing the weight of the entire crane to the track pads and guiding the track to wind smoothly and steadily during movement. They are a crucial link connecting the chassis and the track shoe.
Main functions of crane bottom rollers:
- Supporting the weight of the crawler crane: As a primary load-bearing part, support rollers bear the crane's own weight and the immense pressure during lifting, evenly distributing it to the crane track pads to prevent the equipment from sinking due to excessive localized pressure.
- Ensuring smooth movement: The crane's bottom rollers roll on the track tracks, enabling the track crane to move and turn smoothly on uneven construction sites or muddy roads.
- Assisting track operation: Working in conjunction with the sprocket and idler, they guide the track forward in a predetermined direction, reducing track friction and improving transmission efficiency.
TOP TRACK CRANE
Reliable Crane Track Roller Supplier
As a leading supplier of crane bottom rollers for crawler cranes in China, we focus on the research, development, and manufacturing of high-quality crane bottom rollers. Our crawler track rollers strictly adhere to OEM technical specifications. From material selection to precision machining, we consistently maintain standards higher than the industry average, ensuring that every track roller leaving our factory can withstand the test of complex working conditions.
Our crawler crane lower rollers are exported to more than 50 countries and regions worldwide, serving over 1200 global customers. Among them, over 300 customers have established long-term and stable strategic partnerships with us, with a repurchase rate consistently above 85%. Customer trust stems not only from product quality but also from our “customer first” commitment to excellent service.
Liebherr LTR1220 Track Roller
Kobelco 7080 Bottom Roller
IHI CCH2000 Track Roller
Hitachi KH125-3 Bottom Roller
Robust and Durable
Starting with raw materials, we use high-cost round steel forging to ensure an optimal balance between material purity and toughness. Through a dual process of overall tempering and surface heat treatment, the hardened layer on the bottom roller tread reaches a uniform depth of over 6mm, while the core maintains excellent impact resistance. Whether in rocky mines or gravel construction sites, our track rollers offer superior wear resistance and fatigue resistance for long-term use.
One-Stop Shopping Solution
The crawler crane undercarriage parts, include track rollers, top rollers, sprockets, idlers, and track shoes. We are committed to creating a "one-stop platform for crawler crane undercarriage parts." From Japanese brands like Hitachi, Kobelco, and Sumitomo, to European brands like Liebherr, Terex, and Manitowoc, and domestic brands like Sany, XCMG, and Zoomlion, we cover almost all mainstream brands of crane undercarriage parts on the market. Furthermore, we maintain ample stock of key crawler crane parts for commonly used models—whether you need Liebherr LR11350 track rollers or HITACHI KH300 track shoes, just one phone call and we can procure the complete list for you.
Worry-free After-Sales Service
We have established a comprehensive service system encompassing "precise pre-sales matching, full transparency during the sales process, and rapid after-sales response." All crane track rollers come with a 2500-working-hour quality guarantee—under normal use conditions, if damage occurs due to material or manufacturing defects, we promise to replace it immediately. Whether it's concerns about dimensions during selection, technical difficulties encountered during installation, or maintenance consultations during use, our technical team is always online to ensure your questions receive a professional answer within 24 hours.
Get a Fast Quote
Please specify the crane brand, model, and crane undercarriage parts you require.
Crane Bottom Roller Manufacture
Material of Crane Bottom Roller
A crawler track roller mainly consists of a Roller body, brass bushing, shaft, end cap, oil seal, and O-rings.
Roller body material: 40Mn2, 42CrMo, with 40Mn2 being more common.
O-ring material: Imported high-quality O-rings.
All track rollers are forged from round steel.
Round Steel vs. Square Steel
Round Steel | Square Steel | |
Price | High | Low |
Quality | Track rollers forged from round steel have higher integrity of the internal metal structure, thus possessing stronger compressive and fatigue resistance. Tests show that the fatigue strength of a roller body forged from round steel is more than 30% higher than that forged from square steel. | |
Production Process
1. Forging
Using a large-tonnage forging press, the thoroughly heated blank is forged multiple times to form the roller body rough blank.
2. Normalizing or Tempering Treatment
The forging blank is sent to a heat treatment furnace for tempering treatment (quenching + high-temperature tempering) to adjust the material’s hardness, toughness, and overall mechanical properties.
3. Rough Machining
The outer diameter, end face, and inner hole of the roller body are rough-machined on a CNC lathe to remove forging allowances.
4. Induction Hardening
The raceway surface of the roller body is heat-treated using induction heating equipment to form a wear-resistant hardened layer of a certain depth.
5. Finish Machining and Drilling
The inner bore and end faces of the roller body are precision-machined on a high-precision CNC lathe to ensure dimensional tolerances and surface roughness. Subsequently, the end cap mounting holes, oil holes, and threaded holes are drilled and reamed on a machining center or special-purpose machine.
6. Quality Testing
Chemical Composition Analysis;Tensile Testing;Impact Testing;Hardness Testing;Metallographic Analysis;Non-destructive Testing;Dimensional Inspection
7. Assembly
In a clean environment, the machined crane bottom roller body, shaft, copper bushing, floating oil seal, O-ring, end cap, and other accessories are cleaned, lubricated, and assembled. Ensure the seals are properly installed and that rotation is smooth.
8. Painting
Apply anti-rust primer and topcoat to the finished crane bottom roller to improve appearance quality and corrosion resistance.
Applications in Harsh Environments
Mining Applications
In open-pit and underground mines, crawler cranes constantly face impacts from sharp rocks and abrasives. Our crane bottom rollers feature a hardened layer depth of over 6mm and a tough core, effectively resisting surface deformation and fatigue cracking. A floating oil seal system prevents dust and mud intrusion, ensuring long-term reliability even during continuous 24/7 operation. Below are customer feedback photos of the Manitowoc 14000 track rollers in operation:
Construction Sites
From foundation excavation to high-rise building construction, cranes often operate on muddy, rain-soaked surfaces. Precision-forged track rollers ensure even load distribution, preventing equipment from sinking or veering off course. Bottom track rollers manufactured according to original equipment manufacturer (OEM) drawings perfectly integrate with other OEM crane undercarriage parts, reducing track drag. Based on customer feedback, our Kobelco CK1600 track rollers, Link belt 218HSL track rollers, and HITACHI KH180-3 track rollers have performed exceptionally well in construction projects.
Cold regions and desert applications
Whether in the frigid temperatures of Siberia or the scorching heat of the Middle Eastern deserts, material embrittlement and seal failure are common risks. We customize low-temperature impact-resistant materials and high- or low-temperature resistant O-rings for our customers to ensure that the crane bottom rollers maintain stable mechanical properties and reliable sealing performance even under extreme temperature variations.
Step 1: Preparation
1. Check Components and Tools
Component Confirmation: Verify that the outer diameter, shaft diameter, and mounting hole spacing of the new track rollers match the original specifications, referring to the equipment model. Also check the wheel surface for cracks and dents, and ensure smooth, noiseless rotation.
Tool List: Torque wrench, jack, pry bar, hammer, Allen wrench, grease, and cleaning agent.
2. Site and Equipment Safety
Site: Choose a flat, hard surface to ensure the crane will not tilt or sink during operation.
Equipment Locking: Activate the parking brake and place stop blocks in front of and behind the tracks to prevent accidental movement. For large cranes, safety supports or blocks must be used to support the crane body as required; relying solely on jacks for support is strictly prohibited.
Step 2: Removing the Old Track Rollers
1. Lifting Equipment: Use a jack of sufficient tonnage to lift the crane at the designated lifting point until the tracks are off the ground and there is sufficient space to operate the track rollers. 2. Loosen the Track
First, loosen the bolts at the track joint. Use a pry bar to separate the track plates, exposing the track roller mounting position.
If the track roller is on the outside of the track, it is usually not necessary to disassemble the entire track; the mounting bolts are directly visible.
3. Remove the Fixing Bolts
Loosen and remove the bolts or caps securing the track roller in a diagonal sequence. Do not remove all bolts at once; leave the last two bolts slightly in place.
4. Remove the Old Roller
Insert a pry bar into the gap between the track roller and the track frame and gently pry. Once the track roller detaches from the mounting base, remove it by hand or with an auxiliary tool.
5. Clean the Mounting Surface
Remove dirt and rust from around the base to ensure the new roller fits flat and snugly.
How to Install Track Crane Track Rollers?
Step 3: Installation of the New Track Roller
1. Lifting and Alignment
Align the new crawler crane lower roller with the mounting hole and gently push it into the mounting base. Ensure the mating surfaces of the track roller and the track frame are completely flush, without any misalignment or gaps. 3. Tighten Bolts
Use a torque wrench to tighten bolts according to the standard torque value specified in the maintenance manual.
Step 4: Inspection and Adjustment
1. Re-inspection
Recheck that all bolts are complete and that the torque is within specifications.
2. Track Reset and Tensioning
If the tracks were previously disassembled, reset the track plates and insert them into the pins. Tighten the track bolts to the specified torque.
3. Operational Test
Remove all safety supports and slowly lower the crane. Start the equipment and move it forward slowly, observing:
Whether the new track rollers rotate smoothly, without jamming or abnormal noise.
Whether the tracks run straight.
After running for 10-15 minutes, stop the crane and touch the crane track roller body. The temperature should be uniform and there should be no localized overheating.
Frequently Asked Questions
How do I determine which crane bototm roller is suitable for my crane model?
Tractor rollers are usually specific to a particular model. You will need to provide the crane’s brand, model, and serial number. We also recommend measuring the outer diameter of the old wheel, shaft diameter, mounting bolt hole spacing, and track shoe width to ensure a perfect match.
What is the minimum order quantity?
We support small batch purchases, and even single-piece purchases, to meet customers’ urgent repair needs.
Are you a factory or a trading company?
We are a manufacturer with our own production plant, forging, heat treatment, machining, and sales. Welcome to visit our factory!
Which crane brands do you manufacture track rollers for?
We manufacture crane crawler track rollers for major global brands, including but not limited to: Liebherr, Kobelco, Hitachi, Sumitomo, Manitowoc, Demag, Terex, Link-Belt, Zoomlion, XCMG, and more.
How do you perform dimensional inspection?
Each finished crane lower roller undergoes 100% dimensional inspection using precision calipers, inside micrometers, and specialized gauges to ensure a perfect match with your equipment’s installation tolerances.
If only one crawler crane bottom roller is faulty, do I need to replace all of them?
If other crane lower rollers are severely worn, replacing a single wheel may cause excessive stress on the new bottom roller for crawler crane, accelerating its damage. Therefore, it is recommended to replace them in pairs at least.
