707-E1-00620 Komatsu PC2000-8 Backhoe Boom Cylinder Aftermarket Replacement

Product Overview

SEIGO’s aftermarket boom cylinder, part number 707-E1-00620, is a direct drop-in replacement for the Komatsu PC2000-8 hydraulic mining excavator in backhoe configuration. With a 300 mm bore and 200 mm rod diameter — dimensions confirmed by the matching Komatsu seal kit specification 707-99-96140 — this is one of the two boom cylinders that carry the entire front working equipment through every dig cycle. It works as a pair with 707-E1-00630 on the opposite side of the boom.

On a 200-tonne class mining excavator, the boom cylinders bear the highest sustained structural load of any actuator on the machine. Unlike the bucket cylinder, which sees short high-pressure spikes, the boom cylinders hold the full weight of boom, arm, bucket and payload for the majority of every cycle — typically 400 to 600 cycles per shift in continuous open-pit production. Rod straightness, chrome adhesion and seal integrity under sustained load are therefore the determining factors in service life, and a boom cylinder failure on a PC2000-8 removes the entire machine from production until a replacement arrives on site.

SEIGO manufactures the 707-E1-00620 to full OEM dimensional specification: a 42CrMo4 induction-hardened, hard chrome-plated piston rod at 200 mm diameter, and an ST52 seamless honed steel barrel at 300 mm bore. Genuine NOK (Japan) seals are fitted as standard. Every unit is pressure tested at 1.5× rated working pressure before shipment from our Guangdong factory, and is backed by a 12-month or 2,000 operating-hour warranty. Standard lead time is 4–5 weeks ex-works, with a 2-week Rapid Production Track for unplanned mining downtime.

The PC2000-8 is supplied in either backhoe or front shovel configuration, and the boom cylinder part numbers differ between the two. Part 707-E1-00620 is the backhoe boom cylinder; the front shovel configuration uses 707-E1-01830 and related numbers. Confirm your machine configuration before ordering — the full cross-reference table is below.

Product Specifications

* OEM part numbers, brand names and model designations are used for identification and cross-reference purposes only. SEIGO Machinery is an independent aftermarket manufacturer and is not affiliated with Komatsu Ltd.

Komatsu PC2000-8 Hydraulic Cylinder Cross-Reference

Backhoe and Front Shovel boom cylinders are not interchangeable. The PC2000-8 is supplied in either backhoe or front shovel configuration and the work equipment cylinder part numbers differ between them. Confirm your machine configuration and full serial number before ordering. Group numbers are listed for cross-reference; confirm against your machine parts book, as group-level numbers include mounting pins and bushings that the cylinder assembly number does not.

Component Breakdown — Komatsu PC2000-8 Boom Cylinder

Komatsu publishes a full component breakdown for this cylinder. SEIGO manufactures each of the components below and supplies them individually to hydraulic repair shops and rebuild facilities, as well as supplying the complete assembly.

Sub-component supply: For workshops rebuilding in-house, SEIGO supplies the piston rod, honed tube, cylinder head, piston and seal kit as individual items — typically 40–60% of the cost of a complete replacement cylinder. Send us the component number you need for a quotation. Two cylinder head numbers are catalogued for this cylinder; please confirm your machine serial number before ordering head or piston components.

Cold Climate Specification (−40°C / −50°C)

For PC2000-8 fleets operating in Siberia, Yakutia, Mongolia, northern Canada or Alaska, SEIGO supplies this cylinder to a cold climate specification. Standard hydraulic cylinders can suffer brittle fracture of the barrel or rod, and loss of seal elasticity, once ambient temperature drops well below freezing — failures that typically occur on the first cold start of a shift rather than under load.

The cold climate build uses steel grades with verified Charpy V-notch impact toughness at sub-zero temperature for both barrel and rod, and a polyurethane seal compound formulated to retain flexibility through cold starts.

• −40°C specification — central Russia, northern Canadian territories, Mongolia, Kazakhstan
• −50°C specification — Yakutia, Siberian interior, Arctic Circle operations
• Standard specification — all other climates, including tropical and high-dust operations in Indonesia, Chile, Peru, Australia and Southern Africa

Specify your operating environment when requesting a quotation. There is no difference in lead time between specifications.

Key Features

• Anti-Brittle Fracture Design: The cylinder barrel and rod are forged from materials with high Charpy V-Notch impact toughness at low temperatures, preventing catastrophic structural failure in winter.

• Leak-Free Cold Starts: Equipped with premium low-temp seals that remain flexible in freezing conditions, preventing hydraulic fluid leaks during cold startups.

• Heavy-Duty Backhoe Application: Specifically reinforced to handle the immense lifting and digging forces of the PC2000-8 backhoe attachment structure.

Applications

• Arctic / Polar region mining

• Winter season heavy excavation

• High-altitude mining operations

We stock a full range of cylinders for this brand, including PC1250 and PC800 models.

FAQ

Q1: Is 707-E1-00620 the same as 707-E1-01830?

A: No. 707-E1-00620 is the Backhoe configuration boom cylinder; 707-E1-01830 is the Front Shovel configuration boom cylinder. The PC2000-8 can be configured as either a backhoe or a front shovel, and the boom cylinders are different. Confirm your machine’s configuration before ordering.

Q2: What low-temperature rating do I need for Russian or Canadian operations?

A: For operations in central Russia, Canada’s northern territories, or Mongolia, specify the -40°C seal profile. For Siberian, Yakutia, or Arctic Circle operations, specify -50°C. Both options use polyurethane compounds engineered for sub-zero flexibility.

Q3: What is the lead time for 707-E1-00620?

A: Standard production: 4-5 weeks (large cylinder, custom fit). Rapid Production Track: 2 weeks for urgent mining downtime orders. Rush orders accepted based on current factory loading — contact sales for current availability.