When you're shopping heavy equipment undercarriage parts for a mini excavator, the main decision isn't just roller versus sprocket versus idler - it's finding the component that matches your exact machine model and your wear pattern. The four new parts below cover three different part categories and three equipment brands. You'll want to start by identifying which undercarriage position needs attention, then compare the listed price and fitment details.
Quick take
If your IHI IHI32J needs a track roller, the Bottom Roller Track Roller is a direct-replacement option. If you're replacing a sprocket on an IHI IHI30G, the New Fit For IHI IHI30G Sprocket is the sprocket pick. John Deere and Hitachi owners can look at the Idler Pulley for John Deere 17G, which is listed for several 17-class mini excavators. Case CX36B owners have a dedicated heavy-duty bottom roller in the New Heavy Duty Bottom Track Roller. Across these four parts, listed prices span from $45.99 to $194, so the first filter can be price-but fitment should come first.
Listed price comparison
| Product | Listed price | Price bar | Key attribute |
|---|---|---|---|
| Bottom Roller Track Roller Fit FOR IHI IHI32J Mini Excavator Undercarriage Parts | $45.99 | Black finish, direct replacement | |
| New Fit For IHI IHI30G Mini Excavator Sprocket Undercarriage Parts | $194.00 | Sprocket for IHI IHI30G, model year 2017 | |
| Carbon Steel Idler Pulley for John Deere 17G Mini Excavator Undercarriage Parts | $179.16 | Carbon steel idler pulley | |
| New Heavy Duty Bottom Track Roller For Case CX36B Excavator Undercarriage Parts | $129.00 | Heavy-duty roller, 50 MnB steel, for Case CX36B |
Decision matrix
| Product | Use this for | Trade-off |
|---|---|---|
| Bottom Roller Track Roller Fit FOR IHI IHI32J Mini Excavator Undercarriage Parts | IHI IHI32J track roller direct replacement | Confirm the OE number against your old roller |
| New Fit For IHI IHI30G Mini Excavator Sprocket Undercarriage Parts | IHI IHI30G sprocket replacement, marked for 2017 | Highest listed price in this group |
| Carbon Steel Idler Pulley for John Deere 17G Mini Excavator Undercarriage Parts | Multi-fit idler | Professional installation recommended |
| New Heavy Duty Bottom Track Roller For Case CX36B Excavator Undercarriage Parts | Case CX36B-specific bottom roller | Dedicated to the CX36B fitment |
Product notes
Bottom Roller Track Roller Fit FOR IHI IHI32J Mini Excavator Undercarriage Parts
This bottom roller is a direct replacement track roller for the IHI IHI32J mini excavator. The black finish is paired with a steel construction, and the component uses hardened steel and quality seal groups that are meant to keep lubricating oil inside and keep mud and grime out. A 2-year manufacturer warranty is included. For a mini excavator owner tracking down a wear item, this is the lowest listed price in this four-part comparison. Before you order, compare the photos and the OE number side by side with your old roller to confirm it matches your machine.
New Fit For IHI IHI30G Mini Excavator Sprocket Undercarriage Parts
If you need a sprocket, this new part is made for the IHI IHI30G mini excavator and is marked with the 2017 model year. It is a specialized choice for that undercarriage. The price is the highest listed in this group, and the part number FLTIHI30GSK is provided. The sprocket is manufactured by a company that produces undercarriage spares for mini and large excavators. Since this is a sprocket rather than a roller or idler, make sure your worn part is actually the drive sprocket before committing to this selection.
Carbon Steel Idler Pulley for John Deere 17G Mini Excavator Undercarriage Parts
This idler pulley is engineered from carbon steel, and the compatibility list includes John Deere 17D, 17G, and 17ZTS, plus Hitachi EX17U and ZX17U models. That breadth can be helpful if your fleet has more than one make. The product comes with a 2-year manufacturer warranty and includes one idler pulley. Professional installation is recommended, which is worth factoring into your time. The compatibility list makes it a versatile choice for owners who switch between John Deere and Hitachi machines. It's priced near the top of the group, so weigh the multi-model flexibility against the higher listed price.
New Heavy Duty Bottom Track Roller For Case CX36B Excavator Undercarriage Parts
This track roller is explicitly built for the Case CX36B excavator, with a 50 MnB steel construction and a listed weight of 13.23 pounds. The part uses a surface hardness of HRC52-58, and a hardened depth of 5mm to 10mm, which gives you a clear material story. The part number 9237937/MU3238 can help you compare with your existing roller. The fitment centers on the Case CX36B, so use that cross-reference to confirm your part. The listed weight and hardness spec give you concrete figures to match against your old roller.
Final recommendation by use case
- For an IHI IHI32J track roller: The Bottom Roller Track Roller Fit FOR IHI IHI32J Mini Excavator Undercarriage Parts gives you the lowest listed price in this group.
- For an IHI IHI30G sprocket: The New Fit For IHI IHI30G Mini Excavator Sprocket Undercarriage Parts is the sprocket-specific pick, with part number FLTIHI30GSK.
- For multi-brand 17-class support: The Carbon Steel Idler Pulley for John Deere 17G Mini Excavator Undercarriage Parts covers John Deere 17G and Hitachi EX17U/ZX17U models in one component.
- For a Case CX36B bottom roller: The New Heavy Duty Bottom Track Roller For Case CX36B Excavator Undercarriage Parts matches the Case CX36B with a 50 MnB steel build and a clear surface-hardness spec.
