Top Description
Dingtai manufactures replacement Hitachi track cylinder pistons, the hydraulic actuator component that regulates track tension inside excavator undercarriage assemblies.
Factory-direct manufacturing gives global distributors and equipment fleets complete OEM-compatible solutions without intermediary markups or inconsistent supply.
Precision machining prevents internal oil bypass and pressure loss. The result is stable track tension, reduced derailment risk, and less unscheduled downtime.
With over 20 years of heavy machinery production and ISO9001/SGS certified processes, we deliver dimensionally stable pistons with repeatable batch quality.
Alloy steel, precision grinding, and controlled heat treatment achieve accurate seal geometry and durable wear surfaces for high-pressure hydraulic duty cycles.
Core Selling Points
- Global Brand Compatibility: Manufactured to replace Hitachi track cylinder pistons across EX, ZX, and related undercarriage models without modification.
- Precision Forging/Casting: Piston blanks are precision forged or cast, then CNC machined to achieve dense grain structure and consistent seal groove dimensions.
- Deep Quenching/Heat Treatment: Induction hardening and tempering improve surface hardness, reduce wear, and prevent seal contact area distortion under sustained hydraulic load.
- 100% QC Inspection: Every piston is inspected for diameter tolerance, surface roughness, hardness, and thread geometry before export packaging and shipment.
Product Grid Intro
Our catalog of Hitachi Track Cylinder Piston includes various specifications, fully compatible with Hitachi excavators and bulldozers.
Why Choose Dingtai?
1. Production Technical Parameters
| Technical Parameter | Specification |
|---|---|
| Material | 40Cr / 45# alloy steel as per Hitachi OEM drawing |
| Surface Hardness | HRC 45–52 on seal contact and sliding surfaces |
| Processing | Precision forging, CNC turning, grinding, hard chrome plating |
| Dimensional Tolerance | ±0.02 mm on critical seal grooves |
| Certification | ISO9001:2015, SGS material inspection |
| Warranty | 12 months against manufacturing defects |
2. OEM & Customization
We match OEM drawings, custom dimensions, and material specifications. Provide part numbers, samples, or drawings for reverse engineering and strict compatibility.
3. Applicable Models
| Machine Type | Compatible Brand | Popular Series/Models |
|---|---|---|
| Hydraulic Excavator | Hitachi | EX200-2, EX200-3, EX300-3, ZX200, ZX350LC-3, ZX470 |
| Crawler Equipment | Hitachi | Track adjuster cylinder applications in EX/ZX undercarriages |
4. Delivery & Logistics
We offer reliable export packaging, factory-direct pricing, and flexible order quantities. Standard delivery is 15–25 days depending on stock and destination.
Technical Features
The piston OD is ground to a controlled clearance inside the cylinder barrel. This fit maintains oil film integrity and stable adjustment pressure.
Induction-hardened seal grooves resist deformation under high-pressure cycling. This reduces internal bypass and keeps track tension consistent.
Optional hard chrome plating protects seal contact surfaces from abrasive fines, moisture, and corrosive agents in severe undercarriage environments.
Applications
- Mining: haul roads, pit floor maintenance, digging under abrasive conditions
- Road Construction: excavator track tensioning for grading, trenching, slope work
- Quarrying: high-impact loading and rock debris exposure
- Demolition: cyclic hydraulic loads and rough terrain operation
- Forestry and Land Clearing: moisture, mud, and debris exposure
Frequently Asked Questions
What is the MOQ for Hitachi track cylinder pistons?
Standard MOQ is 1 piece for sample verification. Bulk orders generally start at 10–20 pieces depending on the part number.
What is the delivery time?
Standard delivery is 15–25 days. Customized dimensions or large-volume orders may require 25–35 days before export.
Do you heat treat the piston and what is the hardened depth?
Yes. Induction hardening is applied to seal and sliding surfaces with typical effective depth of 1.5–3.0 mm after final grinding.
What warranty policy applies?
We provide a 12-month warranty against manufacturing defects. It covers material and processing faults, not normal wear or improper installation.
Can you match Hitachi part numbers?
Yes. Provide your Hitachi part number, sample, or drawing. We cross-reference specifications and produce a direct replacement.
Are these pistons compatible with Hitachi EX and ZX series?
Yes. We manufacture pistons for common EX200, EX300, ZX200, ZX350, and related Hitachi undercarriage cylinder assemblies.
What material is used?
40Cr or 45# alloy steel is standard. Optional hard chrome plating is available for high-corrosion and abrasive environments.
Maintenance Guide
- Clean cylinder bore and seal grooves before installation. Remove rust, scoring, and hydraulic oil contamination.
- Lubricate piston and new seals with clean hydraulic oil. Do not assemble dry or use abrasive tools.
- Install piston straight into cylinder bore. Avoid side loading that can scratch sealing surfaces.
- Check track tension weekly. Frequent re-tensioning may indicate internal leakage or worn piston surfaces.
- Replace piston and seals at 3,000–4,000 hour intervals or when measured scoring exceeds 0.10 mm.