569-50-85000 Komatsu HD465 / HD605 Front Suspension Cylinder Aftermarket Replacement

Product Overview

SEIGO’s aftermarket front suspension cylinder, part number 569-50-85000, is a direct drop-in replacement for the Komatsu HD465 / HD605 series rigid-frame mining dump trucks — mechanical-drive haul trucks in the roughly 55 to 65 tonne payload class, widely used in open-pit mining and large-scale earthmoving. Komatsu catalogues this part as Cylinder Assembly, Front Suspension, within the 569-50 suspension series.

A suspension cylinder is not an implement cylinder — it is a gas-over-oil strut that carries the static and dynamic load of the truck corner, damps road-induced shock, and maintains ride height. The front struts on a rigid haul truck sit at the leading corners of the machine and take the first and heaviest impact from a rough haul road, shift after shift, whether the truck is loaded or running empty. Because of this, front suspension struts are among the most safety-critical and hardest-worked structural components on the truck: a strut that has lost its nitrogen charge changes ride height, alters load distribution across the axle, and accelerates tyre and frame wear.

The 569-50 series is the Komatsu HD-series suspension group, and it contains several front and rear strut numbers that differ by model, generation and axle position — for example the rear struts carry 569-50-82000 and 569-50-84000 series numbers, while other front struts in the series include 569-50-81000 and 569-50-86004. Because a single truck model can span several generations with different strut specifications, the machine serial number is the only reliable way to confirm the exact part. Send us your serial number and we will confirm that 569-50-85000 is correct for your machine before you order.

The failure pattern on a suspension strut is distinct: nitrogen charge loss through the rod seal, rod chrome pitting from haul-road stone impact, and internal bleed-down that lets the corner sag over time. SEIGO manufactures the 569-50-85000 to address exactly these — a 42CrMo4 induction-hardened, hard-chrome-plated rod finished for stone-impact resistance, a high-integrity rod seal and gas-charge sealing package, and a barrel machined to hold charge over long service intervals. Every unit is pressure and charge tested before shipment from our Guangdong factory and is backed by a 12-month or 5,000 operating-hour warranty. Standard lead time is approximately 30 days ex-works, with expedited production available for mine-site downtime.

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 HD-Series Suspension Cylinder Reference (569-50 Series)

The 569-50 numbering series covers the front and rear suspension struts across the Komatsu HD465 / HD605 rigid dump truck family. Each position, model and generation uses a different number. Part 569-50-85000 is a front suspension cylinder.

These are not interchangeable alternatives for a single part. Each number corresponds to a specific position, model and generation within the HD465 / HD605 family. Front and rear struts differ in dimensions and gas-charge specification. Confirm your machine serial number and strut position before ordering. SEIGO supplies front and rear suspension cylinders across the Komatsu HD-series — send us your serial number for the correct part.

Front vs Rear Suspension — Order the Correct Position

A rigid haul truck uses different struts front and rear, and they are not interchangeable. Ordering the wrong position is the most common error on suspension strut purchases.

569-50-85000 is a front strut. Front and rear struts have different dimensions and charge specifications and cannot be substituted for one another. If you are replacing struts on both axles, order the correct number for each position. SEIGO supplies all suspension positions for the HD-series — send us your machine serial number to confirm the correct part for each corner.

Why This Cylinder, Specifically

• Correct position and generation, verified. The 569-50 series spans front, rear and auto suspension across multiple HD465 / HD605 generations. We confirm the exact number against your serial number before quoting — the wrong strut on a haul truck corner changes ride height and load distribution from the first shift.
• Built for charge retention. The defining failure mode of a suspension strut is nitrogen charge loss, not work-pressure seal blow-by. We fit a high-integrity rod seal and gas-charge sealing package, and machine the barrel to hold charge across long service intervals.
• Stone-impact rod finish. Front struts sit at the leading corners, directly in the haul-road stone-throw zone. Rod chrome pitting from stone impact is a leading cause of premature seal failure, so the rod is finished specifically for impact and abrasion resistance.
• Safety-critical component, built accordingly. Suspension struts carry the structural load of the truck corner. A failed strut is not just a maintenance issue — it affects handling, braking load transfer and tyre life. We build and test to that standard, with each unit pressure and charge tested before shipment.
• Full traceability and testing. ISO 9001:2015 manufacturing, pressure and charge tested before shipment, shipped in an ISPM-15 fumigated export crate with material certificate and test record.
• Rods, barrels and seal kits supplied separately. For workshops rebuilding struts in-house, we supply the rod, barrel, rod seal, gas-charge seals and bushings as individual service items. Send us your serial number and the component you need for a quotation.

FAQ

Q1: Which Komatsu trucks does 569-50-85000 fit?

A: 569-50-85000 is a front suspension cylinder in Komatsu’s 569-50 suspension series, which covers the HD465 / HD605 family of rigid-frame mining dump trucks — mechanical-drive haul trucks in roughly the 55 to 65 tonne payload class. Because this truck family spans several generations with different suspension specifications, confirm the exact fitment against your machine serial number. Send us the serial number and we will verify 569-50-85000 is correct for your machine before you order.

Q2: Is 569-50-85000 a front or rear suspension cylinder?

A: It is a front suspension cylinder, catalogued by Komatsu as Cylinder Assembly, Front Suspension. The rear suspension struts on these trucks use different numbers in the same series — 569-50-82000 and 569-50-84000 — and are not interchangeable with the front. Front and rear struts have different dimensions and gas-charge specifications.

Q3: Can I use 569-50-81000 or 569-50-86004 instead — they look similar?

A: Not without confirmation. 569-50-81000 and 569-50-86004 are also front suspension cylinders in the same series, but they correspond to different models and generations within the HD465 / HD605 family. Numbers that share the 569-50 prefix are related, not automatically interchangeable. Always confirm against the machine serial number before substituting. Send us your serial number and we will identify the correct front strut for your exact machine.

Q4: What are the warning signs of a failing front suspension cylinder?

A: The most common sign is one front corner sitting lower than the other, or the truck riding harder than it used to and bottoming out over bumps it previously absorbed — both indicate nitrogen charge loss. Oil weeping at the rod gland, and visible pitting or scoring on the exposed rod chrome from haul-road stone impact, are also warning signs. Because both front struts share the same road hours, a fault on one is a strong reason to inspect the other.

Q5: Do you supply rear suspension cylinders and seal kits as well?

A: Yes. SEIGO supplies front, rear and auto suspension cylinders across the Komatsu HD-series, and also supplies rod seals, gas-charge seals, bushings and complete seal kits as individual service items for workshops rebuilding struts in-house. Send us your machine serial number and the part or component you need for a quotation.

Q6: What is the lead time and how does the strut ship?

A: Standard production lead time is approximately 30 days ex-works Guangdong, China, with expedited production available for mine-site downtime. Each strut ships in an ISPM-15 fumigated wooden export crate, FOB Shenzhen, CIF or DDP. Sea freight is standard for planned replacements; air freight is available for urgent situations.

SEIGO Machinery is an independent aftermarket manufacturer. All OEM 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.