Excavator Front Idlers

Front idlers guide the track chain and work with the track adjuster to maintain correct track tension.

Typical materials for front idlers

Material	ZG35SiMn / 40Mn2
Surface hardness	HRC 50–56, depth 5–8 mm
Process	Cast or welded, induction hardened

Common industry values for this part type. The actual steel grade and hardness depend on the part number and are confirmed with each quote.

When to replace front idlers

Center guide ridge worn low or sharp
Running surfaces worn so the links ride low
Oil leaking at the seals
Cracks at the rim

What to confirm before ordering

OEM number on the old idler or in the parts book
Idler only, or idler with yoke and bearing blocks
Outside diameter and overall width
Machine model and serial number

Komatsu Front Idlers

Komatsu PC200-6 Front Idler

20Y-30-13122, 20Y-30-13120

Komatsu PC300-6 Front Idler

207-30-53112

Caterpillar (CAT) Front Idlers

CAT 320 Front Idler

9W-9444

Also fits: 320L, 320N

CAT 320B Front Idler

113-2907

Also fits: 320C

CAT 320D Front Idler

239-4341

CAT 330 Front Idler

6Y-8021, 112-9947

Also fits: 330B

Kobelco Front Idlers

Kobelco SK200-6 Front Idler

24100N5948F2, 24100N6417F1

Also fits: SK200LC-6

Doosan / Develon Front Idlers

Doosan DX35Z Front Idler

K1027280

Hyundai Front Idlers

Hyundai R250LC-9 Front Idler

81N8-13011

Also fits: R290LC-9, R320LC-9, R330LC-9S, HX330L

Volvo Front Idlers

Volvo EC80D Front Idler

VOE14520942

Also fits: ECR88, ECR88D, EC80

Yanmar Front Idlers

Yanmar B22-2 Front Idler

172141-99490

Also fits: B22, B25, B27, B27-2

Kubota Front Idlers

Kubota KX151 Front Idler

RD208-21300

Also fits: KX161-2

Terex Front Idlers

Terex HR1.5 Front Idler

5527640011

Also fits: HR1.6, HR11, HR12, HR13, TC15, TC16, TC20

Can't find your model?

Our partner factories make front idlers for hundreds of machine models not listed here. Send the OEM number or machine model.