707-G1-05760 Komatsu PC2000-11 / PC2000-11R Boom Cylinder Aftermarket Replacement

Machine Fitment

• Komatsu PC2000-11R — Southeast Asia / Indonesia market variant; engine: SAA12V140E-7, 780 kW / 1,050 HP; operating weight 201.5 tonnes; produced 2021–present
• Komatsu PC2000-11 — North America / global variant; engine: SAA12V140E-7, EPA Tier 4 Final, 1,046 net HP; produced 2021–present
• Configuration: Backhoe (BH) and Front Shovel (FS) — confirm attachment configuration with SEIGO engineering team, as boom geometry differs between the two setups

Why This Cylinder, Specifically

• Correct generation, verified. The PC2000-8 and PC2000-11 share no work equipment cylinder part numbers — the -8 uses the 707-E1 series, the -11 uses 707-G1. Fleets running both generations are the most common source of wrong-part orders on this machine. Quote us your serial number and we confirm the generation before we quote the price.
• Matched to the reinforced boom. Komatsu strengthened the frame structures and redesigned the boom and arm on this generation for higher resistance to bending and torsional loads. A stiffer structure passes more of the working load into the cylinder mounting interfaces instead of absorbing it as frame deflection, so mounting geometry tolerance on a PC2000-11 boom cylinder is less forgiving than on the -8.
• Built for the heavy lift duty cycle. Heavy lift mode delivers approximately 10% more boom lifting force. That force reaches the ground through the rod, which is why we specify 42CrMo4 induction-hardened to HRC 58–62 rather than a general-purpose chrome rod — the failure mode at this load level is chrome delamination, not rod bending.
• Abrasive-environment rod finish. Coal, iron ore, copper and shot-rock loading all drive fine abrasive dust past the wiper on every stroke. Rod surface hardness and chrome adhesion determine how many hours pass before scoring starts, which is the single largest variable in service life on this position.
• Replace in pairs, plan once. The PC2000-11 runs paired boom cylinders (assemblies 707-G1-05660 L.H. and 707-G1-05670 R.H.). If both sides have accumulated similar hours, replacing only the failed side usually buys a second unplanned shutdown within the same quarter. We can supply matched pairs, or the pair plus the 707-G1-05780 mid-arm cylinder, on a single purchase order.
• Rods and barrels supplied separately. For mine-site rebuild shops with honing and assembly capability, we supply the piston rod, honed barrel, cylinder head, piston and seal kit as individual items — typically 40–60% of the cost of a complete cylinder, and a fraction of the freight on a 200-tonne-class assembly.
• Emergency production track. Standard lead time is 2–3 weeks ex-works. When a shovel is down and the truck fleet is idle, our Rapid Production Track delivers in 5–7 working days subject to material availability.

FAQ

Q1: Is SEIGO 707-G1-05760 dimensionally identical to the Komatsu OEM part?
A: Yes. Our 707-G1-05760 is manufactured to match all OEM mounting dimensions, pin-eye bore diameters, rod diameter, stroke length, port locations, and thread specifications of the Komatsu original. It is a true drop-in replacement requiring no modification to the machine or boom structure.

Q2: What is the difference between the PC2000-11 and the PC2000-11R?
A: The PC2000-11R is the regional variant distributed primarily across Indonesia and Southeast Asian mining markets, rated at 780 kW / 1,050 HP with the SAA12V140E-7 engine. The PC2000-11 is the North American and global designation using the same SAA12V140E-7 engine platform, certified to U.S. EPA Tier 4 Final at 1,046 net horsepower. Both share the same 201.5-tonne operating weight, 12 m³ bucket capacity, and front attachment architecture. Part 707-G1-05760 applies to both — however, we recommend confirming your full machine serial number with our engineering team before ordering, as regional specification packages can affect certain component variants.

Q3: Does 707-G1-05760 come as a pair, and what is 707-G1-05780?
A: The PC2000-11 uses paired boom cylinders — one on each side of the boom structure. Part 707-G1-05780 is the mid-arm (stick) cylinder, a functionally separate actuator that controls the crowd and dump motion of the arm. SEIGO supplies both cylinders individually or as a complete front attachment set on a single purchase order. If your machine has been operating with both boom cylinders at similar hours, we recommend replacing both together to maintain balanced boom geometry and avoid a second unplanned shutdown.

Q4: What is the lead time for 707-G1-05760?
A: Standard production lead time is 2–3 weeks ex-works Guangdong, China. For mine-site emergency orders, our Rapid Production Track can deliver in 5–7 working days subject to materials availability. Given the physical size and weight of a 200-ton-class boom cylinder, sea freight via FOB Shenzhen is the standard shipping method for planned replacements. Air freight to major hub airports is available for urgent situations and adds approximately 3–5 days transit time.

Q5: Why does the boom cylinder on the PC2000-11 face higher demands than on the earlier PC2000-8?

A: Two changes on this generation matter for the boom cylinder specifically. First, Komatsu strengthened the revolving frame, centre frame and crawler frame and redesigned the boom and arm to resist bending and torsional loads — a stiffer structure transmits more of the working load into the cylinder mounting interfaces rather than absorbing it as frame deflection. Second, the machine offers a heavy lift mode with approximately 10% more boom lifting force. Higher available lifting force means higher sustained rod load and higher circuit pressure at the boom cylinder, which is the loading condition that drives rod chrome fatigue and gland seal extrusion. The practical consequence is that rod chrome adhesion quality and seal specification carry more weight in determining service life on a PC2000-11 than they did on the previous generation.

Q6: What are the warning signs of a failing PC2000-11 boom cylinder?
A: Key indicators include: visible hydraulic oil leakage or weeping at the rod seal; boom drift when held at height with the control lever in neutral and the engine running; slow or uneven boom lift speed, particularly noticeable when one cylinder degrades before the other; reduced lift force under load; and visible chrome scoring, pitting, or delamination on the rod surface during inspection. On a 200-ton machine loading haul trucks continuously, any of these symptoms should trigger prompt inspection — a boom cylinder failure mid-cycle with a loaded bucket is both a production stop and a machine safety concern.

Q7: Do you also supply cylinders for the earlier PC2000-8 platform?
A: Yes. SEIGO manufactures a full range of PC2000-series cylinders across generations, including the PC2000-8 backhoe boom cylinder (707-E1-00620), the front shovel boom cylinder (707-E1-01830), the front shovel arm cylinder (707-E1-01850), and the front shovel clam shell cylinder (707-E1-01880). If your fleet operates a mix of PC2000-8 and PC2000-11 machines, our engineering team can supply the correct cylinder specification for each unit based on serial number and attachment configuration, consolidated on a single purchase order.

Q8: Do you ship to mining operations globally?
A: Yes. We regularly supply 200-ton-class mining excavator cylinders to open-pit operations across Indonesia (Kalimantan coal, Papua and Sulawesi nickel), Australia (Bowen Basin coal, Pilbara iron ore), Chile (Atacama copper), South Africa (Mpumalanga coal, Northern Cape iron ore), Mongolia (via China rail/road), Canada (oil sands), India, and West Africa. We support FOB Shenzhen, CIF, and DDP Incoterms to accommodate any mine site procurement structure.

Q9: Can I buy the rod, barrel or seal kit separately instead of a complete cylinder?

A: Yes. SEIGO manufactures the piston rod, honed barrel, cylinder head, piston and seal kit as individual items and supplies them to hydraulic repair shops and mine-site rebuild facilities. For workshops with in-house honing and assembly capability, sub-component supply typically runs 40–60% of the cost of a complete replacement cylinder. On 200-tonne class boom cylinders this is often the preferred route, since the barrel frequently survives several rod service cycles and freight cost on a bare rod is a fraction of that on a complete assembly. Send us your machine serial number and the component you need for a quotation.