Hitachi ZX-series excavators span compact to mid-size machines, and the undercarriage parts are matched by model family, generation, and serial number. The replacement guide follows the Hitachi structure: identify the machine and position, confirm the part number, and compare aftermarket options on the documented specification. For an Ontario fleet running ZX machines, the undercarriage is a planned line item, not an emergency.
Related reading: for roller identification, see our track roller identification guide, and for sprocket identification, see our sprocket identification guide.
ZX-Series Families and Part Compatibility Across Model Generations
The ZX-series spans several size families, and parts are shared within families across related models. The sharing is a planning advantage, but it is confirmed per serial number.
The model name points to the family, and the serial number picks the exact configuration from the parts book. Two ZX machines of the same name from different generations can carry different undercarriages.
The generation detail matters because Hitachi moved configurations through the same model names over the years. The parts book for the serial number shows which undercarriage the machine actually runs, and the book is the reference every fitment conversation starts from.
Track Rollers and Carrier Rollers for ZX Models: Match by Position
ZX bottom rollers are matched by diameter, width, flange style, and mounting, and the position in the undercarriage sets the part. Carrier rollers on the top run are matched separately.
Identify the roller by the old part number and the position, and confirm the set against the serial number. A roller set ordered as a set arrives with the positions matched.
The position map is the same on a ZX as on any excavator: the front and rear positions carry the turning load, while the middle positions carry the weight in straight travel. Ordering by position and part number seats the rollers correctly, and a set ordered by size alone can put the right part in the wrong place.
Idlers, Sprockets, and Track Shoes
The ZX front idler and drive sprocket complete the loop, and the track shoes carry the ground load on steel-track machines. The idler sets the front line, and the sprocket drives the chain.
Confirm each part against the serial-number parts book, because the configurations changed across generations. The parts that shared within one family may not cross to the next.
The shoe and hardware lines belong in the same order: steel-track machines need the shoe count and bolt pattern confirmed, and the hardware has to match the position. A ZX set ordered with the hardware included is one delivery instead of two.
Hitachi Part Number Patterns
Hitachi part numbers carry the family and configuration in their structure, and the number is read from the part or the parts book. Photograph the old part number before removal and cross-reference it with the supplier.
The part number and the serial number are confirmed together — the number identifies the part, and the serial identifies the machine it fits. When the two agree with the parts book, the fitment is confirmed.
The photograph matters because Hitachi numbers are stamped into the part and can be worn or painted over by service. A photo taken before removal captures the number the parts book can match, and it saves the measuring and cross-referencing that a missing number forces.
Wear Patterns on Hitachi Undercarriages: Read the Site in the Part
ZX undercarriages wear by the machine's duty: track wear on abrasive sites, roller flats under load, idler flange loss over hours, and sprocket hooking when the chain stretches. The pattern follows the site.
Inspect the four part families together at every service and record the readings with the hours. The trend is what schedules the replacement.
The wear record on a ZX machine is also the site record: a machine moved from soft fill to rock shows a jump in impact wear that the numbers explain. When the record and the site story agree, the replacement plan is defensible to the maintenance manager.
Sourcing Hitachi Parts in Canada: Fitment, CAD, and Delivery
Source Hitachi undercarriage parts from a supplier that confirms fitment against the serial number, quotes in CAD, and documents the warranty. The confirmation and the delivery window matter as much as the price.
Keep the fitment confirmation and the invoice with the machine record. The file is the warranty reference and the starting point for the next order.
The sourcing question is also a support question: ask who answers the fitment calls and how the confirmation is documented. A supplier that confirms the fitment in writing before dispatch is a supplier the maintenance plan can rely on.
| Hitachi fitment field | What it settles |
|---|---|
| Machine model and generation | The undercarriage family |
| Machine serial number | The exact configuration |
| Old part number, photographed | The component cross-reference |
| Position in the undercarriage | The right part for the position |
| Aftermarket spec and warranty in writing | The comparison basis |
See the Track Roller collection and the Sprocket collection for your Hitachi machine.
Questions to Ask Before You Order
- What are the undercarriage part numbers for my Hitachi serial number?
- Which parts are shared across my fleet's ZX machines?
- What delivery window applies to the maintenance stop?
Frequently Asked Questions
Do ZX compact and mid-size machines share rollers?
Some rollers are shared within a size family, but compact and mid-size ZX machines use different parts. The serial-number parts book settles the fit.
Which Hitachi generations need extra checking?
Any generation where the model name stayed the same but the undercarriage changed. The parts book for the serial number is the check that catches the change.
How can I tell a ZX undercarriage configuration by eye?
You cannot reliably: dimensions and mounting look similar across generations. Confirm by serial number and part number rather than appearance.