99200040 Komatsu PC3000-6 Boom Cylinder Aftermarket Replacement

Product Overview

SEIGO’s aftermarket boom cylinder, part number 99200040, is a direct drop-in replacement for the Komatsu PC3000-6 hydraulic mining excavator — one of the largest backhoe/front shovel machines in active operation globally, with an operating weight of approximately 250–261 metric tons and a rated engine output of 940 kW (1,260 HP). Part 99200040 is the current superseding number in the PC3000-6 boom cylinder series, replacing earlier OEM numbers including 79874173 and 79864273.

On the PC3000-6, the boom cylinders — mounted in pairs on either side of the boom structure — bear the full dynamic load of lifting the boom, stick, and bucket assembly along with the digging crowd force transmitted through the front attachment during every working cycle. In open-pit mining applications, where the PC3000-6 is commonly paired with 85–165 US ton haul trucks and operates at continuous high-cycle rates in iron ore, copper, coal, and oil sands excavation, the boom cylinders endure some of the most severe fatigue and pressure-spike loading of any hydraulic actuator on the machine. The high hydraulic system pressure — up to 310 bar across three 910 L/min main pumps — means that any seal or rod failure translates immediately to costly production downtime.

SEIGO manufactures the 99200040 to full OEM replacement specification: 42CrMo4 induction-hardened, hard-chrome-plated piston rod to HRC 58–62 for resistance to scoring and chrome delamination under abrasive mining conditions; ST52 seamless honed steel barrel; and a genuine NOK (Japan) or Parker (USA) seal kit rated for the PC3000-6’s high-pressure hydraulic circuit. Every unit is pressure-tested at 1.5× rated working pressure before shipment and is backed by a 12-month or 2,000 operating-hour warranty. Standard lead time is 2–3 weeks ex-works Guangdong, China, with a 5–7 day Rapid Production Track for mine-site emergencies.

Technical Specifications Table

Machine Fitment

• Komatsu PC3000-6 — Front Shovel (FS) and Backhoe (BH) configurations, produced 2017–2021
• Engine: Komatsu SDA12V159E-2 (Tier 2), 940 kW / 1,260 HP @ 1,800 rpm
• Operating weight: 250–261 metric tons depending on shoe width and configuration

Key Features & Quality Points

• Current superseding OEM number — replaces 79874173 and 79864273 with no fitment changes
• Rated for PC3000-6’s 310 bar hydraulic system pressure
• 42CrMo4 induction-hardened rod to HRC 58–62 — resists chrome scoring in high-cycle mining service
• NOK / Parker premium seal kit — zero-leakage performance at PC3000-class system pressures
• 100% pressure tested at 1.5× rated working pressure before shipment
• ISO 9001:2015 certified manufacturing process
• Drop-in fitment — no modification required
• 12-month / 2,000-hour warranty, whichever comes first
• Export-grade fumigated wooden crate packaging
• FOB Shenzhen / CIF / DDP shipping terms available

FAQ

Q1: Is SEIGO 99200040 dimensionally identical to the Komatsu OEM part? A: Yes. Our 99200040 is manufactured to match all OEM mounting dimensions, pin-eye bore diameters, stroke length, port locations, and thread specifications of the Komatsu original. It is a true drop-in replacement requiring no modification to the machine.

Q2: What is the relationship between 99200040, 79874173, and 79864273? A: Part 99200040 is the current Komatsu superseding number that replaces the earlier OEM references 79874173 and 79864273. All three numbers refer to the same boom cylinder position on the PC3000-6 — they represent successive revision updates to the same component. When ordering, 99200040 is the correct current reference regardless of which number appears in your original parts book.

Q3: What is the lead time? A: Standard production lead time is 4-5weeks ex-works Guangdong, China. For mining emergency orders, our Rapid Production Track can deliver in 5–7 working days subject to materials availability. Air freight to major international hub airports adds approximately 3–5 days transit time.

Q4: Does 99200040 fit both the Front Shovel and Backhoe configurations of the PC3000-6? A: Yes. The boom cylinder part number 99200040 applies to both the PC3000-6 FS (Front Shovel) and PC3000-6 BH (Backhoe) attachment configurations. Please confirm your specific machine serial number and attachment configuration with our engineering team before ordering, as boom geometry differs between front shovel and backhoe setups.

Q5: Do you supply matching stick and bucket cylinders for the PC3000-6? A: Yes. SEIGO supplies the complete cylinder set for the PC3000-6: boom cylinder 99200040, stick cylinder 99201040, and bucket cylinder 99202040. All three can be ordered together on a single purchase order, with consistent lead times and consolidated shipping.