Leading Undercarriage Rollers Supplier in Australia for Excavators & Dozers
For the undercarriage system of a crawler machine, rollers are vital components. They are responsible for carrying the machine’s weight, guide the track chain, and help distribute impact and shock loads, especially when moving through uneven or high-impact surfaces. DOZCO specializes in designing and manufacturing undercarriage parts for heavy equipment. We offer single‑ and double‑flange bottom rollers as well as carrier rollers for crawler machines from 1 ton to 250 tons. We are a trusted manufacturer and global supplier of high-performance undercarriage parts for heavy equipment, including hydraulic excavators, and dozers of diagonal brace and pivot shaft type, and elevated sprocket machines. Our product range includes Caterpillar rollers, Komatsu track rollers, and other components engineered for various OEMs.
Key Features of Rollers
High load-bearing roller design
Surface-hardened alloy steel shells
Precision-sealed floating seal system
OEM-compatible, ISO-certified rollers
Understanding Rollers
- Types
- Key Components
- Maintenance Insights
Lower (Track) Rollers
Lower rollers, also known as track or bottom rollers, are mounted beneath the track frame. They carry the machine’s operating weight and guide the track chain as it moves over uneven ground. These components are often the first to absorb shock loads from rough terrain. At DOZCO, we manufacture ISO-certified dozer track rollers.
Carrier Rollers
Carrier rollers are positioned along the upper side of the track frame. Their function is to support the return side of the track chain between the sprocket and front idler. Proper carrier roller placement helps control track sag, reduce vibration, and maintain smooth track movement. At DOZCO, we manufacture and supply OEM-compatible excavator carrier rollers in Australia.
Roller Shell
The roller shell is the outer surface that remains in constant contact with the track chain. It is manufactured from high-strength alloy steel and surface-hardened through induction to withstand abrasion, impact, and prolonged rolling contact in harsh site conditions.
Shaft
Each roller rotates around a stationary shaft. This fixed shaft design improves structural stability and allows consistent load transfer across the undercarriage. In carrier rollers, the shaft often includes an internal oil reservoir to ensure continuous lubrication during operation.
Floating Seals
Floating seals are installed at both ends of the roller shell. Their function is to keep lubricant sealed inside while preventing dirt, dust, mud, and debris from entering. Optional rubber ring variations allow these seals to perform reliably across different temperature ranges and site environments.
Brackets
The shaft ends are secured into heavy-duty brackets that lock the roller assembly firmly to the track frame. These brackets prevent unwanted movement under load and help maintain proper roller alignment during operation.
Bushings / Bearings
Bronze bushings are press-fitted inside the roller shell and rotate around the shaft. During operation, oil forms a thin film between the bushing and shaft, reducing friction and heat build-up. On selected carrier roller models, oil-supplied roller bearings may be used instead to further reduce friction and improve efficiency.
Daily Inspection
Proper alignment and regular inspections are essential for extending roller and overall undercarriage life.
Regular cleaning
Soil packing around rollers can restrict movement, leading to dry joints, oil leaks, and uneven wear on rollers and track chains. Regular checking and cleaning keeps movement smooth.
Checking track tension
It causes mismatched wear between link rail sides and roller flanges, affecting machine stability.
Track alignment
Track misalignment accelerates wear on inboard and outboard roller flanges as well as sprocket teeth.
Temperature Monitoring
During extended travel, such as walking the machine for more than 100 metres or three minutes, roller temperatures should be monitored. If any roller exceeds ambient temperature by 20°C, pause operation and allow cooling.
Applications of Rollers
Rollers play a key role in keeping crawler machines stable and efficient on all types of terrain. They help carry the machine’s weight, guide the track smoothly, and reduce impact during operation.
Carry machine weight evenly across tracks
Guide track chain for smooth travel
Absorb shock from uneven terrain
Reduce vibration and undercarriage stress
Why Choose Rollers from DOZCO
DOZCO rollers are engineered for superior durability and consistent performance in demanding construction and mining conditions. Designed with precision and high-grade materials, they ensure long service life and reduced maintenance.
Exceptional wear resistance with alloy steel shells
Precision-machined shafts and bushings for smooth operation
Broad compatibility with leading OEM brands
Tested to meet global standards for durability and reliability
Aftermarket Undercarriage Rollers Designed to Fit Major OEM Brands of Heavy Machinery
(*OEM names or part numbers are for reference only. )Caterpillar, Komatsu, Volvo, Liebherr, Doosan, Kobelco, Sumitomo, Hitachi, Hyundai, YANMAR, CASE, John Deere, and more
Caterpillar (CAT)
Komatsu
Hitachi
Volvo
Hyundai
Doosan
JCB