Hitachi ZX330 Parts India — HPV145 Pump, 6HK1 Engine, Undercarriage

Hitachi ZX330 — The 33-Tonne Excavator for Quarry and Infrastructure

The Hitachi ZX330 sits in the 33-tonne class — between the popular 20-tonne machines and the 40–50-tonne mining excavators. In India, it is the excavator of choice for large quarry operations, dam construction, and heavy road cutting where the ZX200's reach and breakout force fall short but a full mining-class machine is disproportionate to the task. In Africa and the Middle East, the ZX330 is extensively used in iron ore, copper, and aggregate quarrying operations.

The ZX330 has been through three active generations in Indian and export fleets: ZX330-3 (2006–2013), ZX330-5 (2013–2019), and ZX330-5A/5B (2019–present). This guide covers the generation differences that matter for parts ordering, the 6HK1 engine maintenance requirements, and the HPV145 pump system.

ZX330 Generation Differences — What Matters for Parts

ZX330-3 (2006–2013) — Serial: 330LC-3-XXXXXX

The ZX330-3 uses the Isuzu 6HK1XQP engine — a 7.8-litre six-cylinder turbocharged unit producing 188 kW (252 hp). This is a mechanically injected engine, making it highly reliable and field-serviceable. The hydraulic pump is the Hitachi HPV145 — a tandem variable-displacement axial-piston unit producing up to 2 × 145 cc/rev, architecturally similar to the Kawasaki K3V140. The HIOS III control system provides Power, Standard, and Economy modes.

ZX330-5 (2013–2019) — Serial: 330LC-5-XXXXXX

The ZX330-5 introduced the Isuzu Tier 4 Interim engine — the AH-6HK1XKSA producing 192 kW (258 hp). Indian and most export market versions retained mechanical injection. The HIOS V system improved pump-engine matching, and the hydraulic system was updated with the ZX330-5's advanced hydraulic control valve. The cab received a larger monitor display and ZAXIS Link telematics. Many pump and engine components are shared with the -3 generation, but control valve cartridges and electronic modules differ.

ZX330-5A/5B (2019–Present)

Current generation ZX330-5A (Asia spec) and ZX330-5B (with EcoMode Plus) meet BS IV / Tier 4 Final requirements where mandated. Key changes from -5: redesigned hydraulic main valve block with improved flow sharing, updated pump regulators, revised cab with 8-inch colour monitor. Engine parts remain 6HK1 architecture but with updated injection timing maps. Confirm serial prefix before ordering electronic components.

ZX330 Filter Kit — Service Intervals

HPV145 Hydraulic Pump — Diagnostics and Rebuild

The HPV145 is a robust pump but its higher displacement means it generates proportionally more heat at high load. Key diagnostic procedure: measure case drain flow at rated engine speed with machine at operating temperature. Normal case drain flow is 3–5 L/min per section. Flow above 10–12 L/min per section indicates significant slipper pad and cylinder block wear, warranting pump rebuild or replacement.

Rebuild components for the HPV145 include the cylinder block assembly (9 pistons per section), piston shoe set, valve plate set, shaft seal, and charge pump gear set. A complete pump rebuild with new OEM or Kawasaki K3V140-compatible aftermarket parts costs ₹80,000–1,40,000 depending on parts quality — compared to ₹4,50,000–7,00,000 for a new pump.

Isuzu 6HK1 Engine — Maintenance and Common Issues

• Injection pump wear (ZX330-3) — The 6HK1XQP uses a Bosch-Zexel in-line injection pump. Rack and plunger wear causes uneven cylinder contribution and black smoke. Rebuild with Bosch aftermarket kits is straightforward.
• Turbocharger oil feed restriction — Carbon deposits in the oil feed line to the turbocharger are common on machines with extended oil change intervals. Flush the turbo oil feed line at every 2,000-hour service.
• Intercooler fouling — If the turbo develops a shaft seal leak, oil mist passes through the intercooler and fouls the intake manifold. Clean the intercooler when replacing the turbocharger.
• Coolant hose degradation — Indian climate accelerates coolant hose hardening. Inspect all hoses at 2,000 hours; replace before they crack.
• EGR cooler fouling (ZX330-5) — Stage III compliant units develop EGR cooler fouling on Indian diesel. Service at 3,000-hour intervals.

Undercarriage Specifications — ZX330