High-Performance Idlers for OEM Undercarriage Systems
In the heavy-duty sector, idlers are reliable undercarriage parts. These undercarriage parts ensure smooth redirection of the track from the sprocket to the front of the frame. DOZCO manufactures high-quality undercarriage parts for heavy equipment. This includes excavator idler wheels, along with front idler assembly and rear idler assembly for dozers, designed to guide the track chain and maintain proper alignment. The front idler is a large wheel at the front of the track frame. It acts as a pivot point, redirecting the track chain back toward the sprocket. A rear idler, on the other hand, is located at the rear of the undercarriage. It makes sure that the tracks are properly aligned and tight to avoid the risk of derailment during operation.
Key Features
Heat-treated for long wear life
Engineered for heavy-duty loads and shock absorption
Available in cast and fabricated versions
Designed to Meet International Standards
Understanding Idlers
- Key Components
- Maintenance Insights
Idler Shell
The idler shell is what is exposed to constant impact. Therefore, it is surface-hardened through induction to add strong wear resistance in challenging environments.
Shaft
The idler rotates around a stationary shaft. The shaft includes an internal oil reservoir that maintains continuous lubrication during operation.
Floating Seals
The seals are placed at each bushing end, designed to keep lubricant inside and contaminants like dirt and debris out. It often comes with optional rubber ring variations for better performance in different climate conditions.
Brackets
The shaft ends are mounted into heavy-duty brackets that enable free rotation. These brackets slide inside the track frame, supporting the recoil spring system and helping absorb shock loads, thereby protecting the undercarriage.
Bushings
Bronze bushings are pressed into the idler shell and rotate around the shaft. During rotation, oil forms a film between the bushings and shaft to reduce heat generation and friction that can lead to wear.
Toe-In / Toe-Out Misalignment
Toe-in or toe-out misalignment typically occurs due to a bent idler yoke or a distorted idler box section. These structural deformations can lead to uneven wear on the sides of the link rail, which over time also damages the idler flanges and the flanges of the first track roller. It is essential to thoroughly inspect the undercarriage components for any bends or warping. If the components are only slightly out of shape, they only need straightening. However, if structural recovery is not feasible, the idler yoke needs to be replaced to restore proper alignment and prevent further wear.
Lateral Displacement
Improper shimming during installation causes lateral displacement of the excavator idler wheel. When the shims are incorrectly adjusted, it can shift the idler sideways, causing excessive wear on the idler flanges, track links, and roller flanges. Over time, this misalignment causes additional stress on the track assembly, which impacts its longevity. Adjusting shims properly and maintaining a clearance of 0.5 to 1 mm between the guide plates and the track frame allows proper movement without causing misalignment.
Twist / Tilt Misalignment
Twist or tilt misalignment occurs if inner or outer support box sections are vented or from uneven wear on the idler wear plates. This can lead to abnormal wear patterns, especially on the idler flanges and the inner sides of the track link rails. Leaving it unattended can also impact other components of the undercarriage system. The primary option is to straighten the support box or yoke. In case that is not possible, it is recommended to proceed with component replacement.
Applications of Idlers
Specially engineered construction idlers offer better performance in Heavy-duty construction sites
Mining idlers are designed to withstand rugged mining operations
Suitable for infrastructure and earthmoving projects
Why Choose DOZCO Idlers for Your Undercarriage System
Heat-treated for long wear life
Engineered for heavy-duty loads
Available in cast and fabricated versions
Compatible with major OEM brands (e.g., Komatsu idlers)
Aftermarket Idlers for Heavy Equipment
(*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) Excavator
DOZCO aftermarket idlers are engineered to fit Cat excavators and dozers including the 301.5, 307.5, 310, 320, 330BL, 336BL, 349, D6, D8T, and D9T — delivering precise track alignment and long wear life across Australian sites.
Komatsu Excavator
DOZCO idlers are precision-matched to fit Komatsu machines including the PC30MR, PC88MR, PC138US, PC200-8, PC210LC, PC300-8, PC360LC, PC450LC, PC490LC, D65EX, D85EX, and D155AX — the most widely operated machines across Australian worksites.
Hitachi
DOZCO idlers are built to fit Hitachi excavators including the ZX55U-5A, ZX135US-6, ZX200-5G, ZX210LC-5, ZX350LC, ZX470LC, and ZX490LCH-7, ensuring reliable track guidance across Australian civil and mining operations.
Volvo Excavator
DOZCO aftermarket idlers are compatible with Volvo excavators including the EC210 and EC220, maintaining correct track tension and alignment for civil contractors across Australia.
Hyundai Excavator
DOZCO idlers are designed to fit Hyundai crawler excavators, ensuring smooth track redirection and alignment on Australian construction and earthmoving sites.
Doosan Excavator
DOZCO idlers are compatible with Doosan crawler excavators, maintaining proper track chain guidance and alignment across Australian mining and construction environments.
JCB Excavator
DOZCO idlers are engineered to fit JCB tracked excavators, providing reliable front idler performance and track alignment on Australian job sites.
Kubota Excavator
DOZCO track shoes are engineered to fit Kubota excavators including the U17-3, U25, U27-4, U35-4, KX033-4, U55-4, KX057-4, KX080-3S, and KX100, delivering maximum ground traction and wear life for Australia's most widely operated compact excavator range.
Yanmar Mini Excavator
DOZCO track shoes are precision-matched to fit Yanmar excavators including the ViO17, ViO25, ViO27, ViO80, ViO80-7, and SV100, providing reliable ground engagement across compact and mid-class machines used in Australian hire fleets and civil operations.
Kobelco Excavator
DOZCO track shoes are built to fit the Kobelco SK135SR-3 and SK135SR-7 — Australia's #1 selling heavy excavator for 12+ consecutive years — engineered for superior traction and extended service life on high-utilisation Australian job sites.
John Deere
DOZCO track shoes are designed to fit John Deere dozers including the 750L and 850L, offering strong ground penetration and bending resistance for Australian civil and earthmoving applications.
CASE Excavator
DOZCO track shoes are compatible with CASE dozers including the 1150M and 1650M, delivering dependable traction and durability for Australian civil construction and agricultural sector operations.
DOZCO Idlers Available Across Australia
Most operators don't think about their front idler until the track starts playing up. It guides the track, absorbs constant impact, and takes a beating every single shift — so when it wears out, you need a replacement you can count on quickly. DOZCO stocks excavator idler wheels and Komatsu idlers for a wide range of crawler machines used on Australian sites. Tell us your machine and we'll find the right fit — no guessing, no waiting around. Headquartered in Melbourne, we ship to customers in Sydney, Perth, Brisbane, Adelaide, and across the country. Find your nearest distributor or request a quote below.
Frequently Asked Questions
Q. What’s special about the DOZCO excavator idler wheel?
Q. Are idlers important undercarriage parts for an excavator?
Q. What’s the routine maintenance for excavator idler wheels?
Q. Do you offer a warranty on idlers?
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