99200040 Komatsu PC3000-6 Front Shovel 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 in front shovel configuration. It is the current Komatsu superseding number, replacing the earlier references 79874173 and 79864273, and applies to the same boom cylinder position across all three revisions. The PC3000-6 is a 260-tonne class machine built by Komatsu Mining (formerly Demag), and its cylinders carry the Demag-heritage eight-digit numbering system rather than the 707-series numbers used on Komatsu’s Japan-built excavators.

The boom cylinders — mounted in pairs on either side of the boom structure — carry the full dynamic load of lifting the boom, stick and bucket assembly along with the crowd force transmitted back through the front attachment during every dig cycle. In open-pit mining, where the PC3000-6 loads rigid-frame haul trucks in iron ore, copper, coal and oil sands at continuous high-cycle rates, the boom cylinders endure some of the most severe fatigue and pressure-spike loading of any actuator on the machine. Because they hold sustained load through most of each cycle rather than seeing brief spikes, rod chrome adhesion and gland seal integrity under continuous pressure are the two factors that most directly determine service life — and a boom cylinder failure removes the entire machine from production until a replacement reaches site.

SEIGO manufactures the 99200040 to full OEM replacement specification: a 42CrMo4 induction-hardened, hard-chrome-plated piston rod to HRC 58–62 for resistance to scoring and chrome delamination under abrasive mining conditions; an ST52 seamless honed steel barrel; and a genuine NOK (Japan) or Parker (USA) seal kit specified for the PC3000-6’s high-pressure circuit. 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 2–3 weeks ex-works, with a 5–7 day Rapid Production Track for mine-site emergency orders.

Configuration note: the PC3000-6 is supplied in either front shovel or backhoe configuration, and the front-attachment cylinder part numbers differ between the two. Part 99200040 belongs to the front shovel cylinder group (99200040 boom, 99201040 stick, 99202040 bucket). If your machine is a backhoe, send us the serial number and we will confirm the correct backhoe boom cylinder number.

Product Specifications

* 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. or Komatsu Mining GmbH.

Komatsu PC3000-6 Cylinder Cross-Reference — Front Shovel & Backhoe

The PC3000-6 is supplied in front shovel (FS) and backhoe (BH) configurations, and each position uses a different part number between the two. All numbers below are in the Komatsu Mining (Demag) eight-digit system. Part 99200040 is the front shovel boom cylinder.

Front shovel and backhoe cylinders are not interchangeable. Part 99200040 is the front shovel boom cylinder; the backhoe boom cylinder is a different part (92492040 / 99204040). Confirm your machine configuration and full serial number before ordering. SEIGO supplies all cylinder positions for both configurations of this machine.

Complete PC3000-6 Front Shovel Cylinder Set

For a planned front-attachment rebuild, SEIGO can supply the complete front shovel cylinder set on a single purchase order, and also supplies each cylinder’s individual components — piston rod, honed barrel, cylinder head, piston, bushings and seal kit — to mine-site rebuild facilities.

Sub-component and seal kit supply: the numbers 79874173 and 79864273 are referenced both as superseded cylinder numbers and as the seal kit for this boom cylinder. SEIGO supplies the complete seal kit as well as individual rods, barrels, heads and pistons — sub-component supply typically runs 40–60% of the cost of a complete replacement cylinder, and a fraction of the freight on a 260-tonne-class assembly. Send us the part number and the component or seal kit you need for a quotation.

Why This Cylinder, Specifically

• Correct numbering system, verified. The PC3000 uses Demag-heritage eight-digit numbers, not the 707-series used on Komatsu’s Japan-built machines. We confirm the number and configuration against your serial number before quoting, because front shovel and backhoe cylinders on this machine carry different numbers.
• Supersession handled correctly. 99200040 is the current number replacing 79874173 and 79864273. Whichever number appears in your parts book, we supply the current-specification cylinder — and because those earlier numbers also identify the seal kit, we can supply the seal kit alone if you are rebuilding rather than replacing.
• Built for sustained lift load. The boom cylinders hold the full weight of the front attachment and payload through most of each cycle. We use a 42CrMo4 rod, deep induction-hardened to HRC 58–62 and hard chrome plated, dimensioned for that sustained load — the failure mode here is chrome delamination and gland seal extrusion, not rod bending.
• Replace in pairs, plan once. The PC3000-6 runs paired boom cylinders. If one side has reached service limit, the other is usually close behind. We supply matched pairs, and can add the stick (99201040) and bucket (99202040) to the same order so the front-attachment work happens in one planned shutdown.
• Rods, barrels and seal kits supplied separately. For mine-site rebuild shops, we supply each component individually — typically 40–60% of complete-cylinder cost, and far lower freight on a bare rod or a seal kit.
• Full traceability and testing. ISO 9001:2015 manufacturing, 100% pressure tested at 1.5× rated working pressure, shipped in an ISPM-15 fumigated export crate with material certificate and test record.

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 PC3000-6?

A: No. 99200040 is the front shovel boom cylinder. The backhoe configuration uses a different boom cylinder — 92492040, which Komatsu supersedes with 99204040. All front-attachment cylinders differ between the two configurations, so confirm whether your machine is FS or BH before ordering. Send us your full machine serial number and we will confirm the correct cylinder.

Q5: What is the Komatsu Mining / Demag numbering, and why doesn’t the PC3000 use 707 numbers?

A: The PC3000 is built by Komatsu Mining GmbH, formerly Demag, in Germany, and descends from the Demag H185 mining excavator. Unlike Komatsu’s Japan-built excavators such as the PC2000, which use 707-series part numbers, the PC3000 retains the original Demag eight-digit numbering system. 99200040 (written 992 000 40) is the front shovel boom cylinder in this system.

Q6: What are 79874173 and 79864273 — the cylinder or the seal kit?

A: Both, in effect. 79874173 and 79864273 are the earlier references that 99200040 supersedes, and the same numbers identify the seal kit for this boom cylinder. If you are replacing the complete cylinder, order 99200040. If you are rebuilding an existing cylinder and only need the seals, quote 79874173 / 79864273 and we will supply the correct seal kit dimensioned for this cylinder.

Q7: I operate an older PC3000-1 or a Demag H185 — can you supply for those too?

A: Yes. The PC3000 platform descends from the Demag H185 line, and a number of hydraulic cylinders carry over across the PC3000-1, PC3000-6 and Demag H185S. Send us the part number in your records, whether it is a Komatsu eight-digit number or a Demag-era reference, together with the machine serial number, and we will confirm the correct current cylinder and manufacture to that specification.

Q8: What is the lead time?

A: Standard production lead time is approximately 30 days ex-works Guangdong, China. For mine-site emergency orders we offer expedited production subject to material availability. Given the size and weight of a 260-tonne-class boom cylinder, sea freight via FOB Shenzhen is standard for planned replacements; air freight to major hub airports is available for urgent situations.

SEIGO Machinery is an independent aftermarket manufacturer. All part numbers, brand names and machine model designations are used for identification and cross-reference purposes only. These aftermarket components are not manufactured by, endorsed by, or affiliated with Komatsu Ltd. or Komatsu Mining GmbH.