707-E1-01870 Komatsu PC2000-8 Front Shovel Bucket (Crowd) Cylinder Aftermarket Replacement

Product Overview

SEIGO’s aftermarket bucket cylinder, part number 707-E1-01870, is a direct drop-in replacement for the Komatsu PC2000-8 hydraulic mining excavator in front shovel (loading shovel) configuration. The same cylinder is catalogued under the alternate designations 707-F1-01870, 707-H1-X2630 and 707-H1-X2640, and carries the Demag / Komatsu Mining part number 92229040 — a legacy number still used in the parts systems of many long-established open-pit operations, since the PC2000 front shovel platform descends from the Demag mining excavator line.

On a loading shovel this cylinder performs the crowd function: it drives the bucket through the material and generates the breakout force that fractures and fills. This is a different job from the bucket cylinder on a backhoe machine, which tilts and curls the bucket — the front shovel bucket cylinder works in near-pure compression against a solid face, at bench level, transmitting the reaction load straight back through the rod into the linkage. It is the force-transmitter and stabiliser for the entire bucket assembly during the dig, which is why the failure mode here is rod buckling and eye-bushing wear under compressive shock, not the seal extrusion that dominates on tilt and clam cylinders.

SEIGO manufactures the 707-E1-01870 to that duty specifically: oversized rod eyes and reinforced cylinder walls to carry compressive shock load, a 42CrMo4 induction-hardened, hard chrome-plated piston rod dimensioned for buckling resistance rather than minimum weight, and an ST52 seamless honed steel barrel. Buffer seals are specified to absorb the pressure spikes generated when the bucket teeth meet unbroken rock or oversize. Genuine NOK (Japan) or Parker (USA) 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. HVOF rod coating is available as an upgrade for high-abrasion ore faces.

The boom and arm cylinders on the same machine are different parts — 707-E1-01830 (boom) and 707-E1-01850 (arm). Confirm your machine configuration and serial number 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. or Komatsu Mining GmbH.

Komatsu PC2000-8 Front Shovel Cylinder Cross-Reference

Each row above is a different cylinder, not an alternative for the same part. The four Komatsu numbers and the four Demag numbers correspond one-to-one by position. Suppliers frequently publish all eight numbers together as though they were interchangeable — they are the boom, arm, bucket and clam cylinders respectively. If you are ordering against an eight-digit Demag number, confirm the position before raising the purchase order.

PC2000-8 vs PC2000-11 — Different Cylinder Series

The PC2000-8 and PC2000-11 are separate generations and share no work equipment cylinder part numbers. If you operate a PC2000-11, none of the 707-E1 numbers above apply:

If your fleet operates a mix of PC2000-8 and PC2000-11 machines, our engineering team can supply the correct cylinder for each unit based on serial number and attachment configuration, consolidated on a single purchase order.

Why This Cylinder, Specifically

• Built for compression, not tilt. A front shovel bucket cylinder works in near-pure compression against a solid face, where a backhoe or tilt cylinder works in bending and curl. We dimension the rod for buckling resistance and fit oversized rod eyes, because the failure mode here is rod buckling and eye-bushing wear under compressive shock — not the seal extrusion that limits tilt and clam cylinders.
• Breakout force delivered to the tooth. The cylinder is built to the OEM implement circuit pressure rating so it reproduces the original crowd force curve. Force at the tooth depends on circuit pressure, piston area and linkage angle together — a cylinder built under OEM bore and rod dimensions delivers the force the machine was designed to deliver, across the full stroke.
• Shock absorbed before the primary seal. When bucket teeth meet unbroken rock or oversize, the resulting pressure spike is absorbed by a buffer seal stage before it reaches the primary rod seal. This is the specific failure path we engineer against on a crowd cylinder, and it is why a general-purpose seal package is the wrong choice for this position.
• Abrasive-face rod finish. Iron ore, coal and shot-rock faces drive fine abrasive past the wiper on every stroke. Rod surface hardness and chrome adhesion set the interval before scoring begins; HVOF tungsten-carbide coating is available where the face is especially abrasive.
• Exact linkage geometry. Built strictly to 707-E1-01870 mounting dimensions, so bucket range of motion and pin alignment match the original — no linkage binding, no modified range of motion.
• Rods and bushings supplied separately. For mine-site rebuild shops, we supply the piston rod, honed barrel, cylinder head, piston, eye bushings and seal kit as individual items — typically 40–60% of the cost of a complete cylinder. On crowd cylinders, eye-bushing and rod replacement are the most common single-item orders.

FAQ

Q1: How does 707-E1-01870 handle the shock of hitting hard rock?

A: On a front shovel, the highest transient loads occur when the bucket teeth meet unbroken rock or oversize during the crowd stroke. Rather than quoting a single pressure figure — peak transient spikes are brief and vary with material, tooth condition and operator technique — the design approach is to stage the sealing so that a buffer seal absorbs the spike before it reaches the primary rod seal, and to dimension the rod for buckling resistance under compressive shock rather than for minimum weight. Seal extrusion behind an unprotected primary seal, and rod buckling under compression, are the two failure modes we engineer against on this position specifically.

Q2: Does 707-E1-01870 fit the PC2000-8 backhoe bucket?

A: No. The backhoe configuration uses a different bucket cylinder part number and a different bucket geometry — a backhoe bucket cylinder tilts and curls the bucket, while 707-E1-01870 is the front shovel crowd cylinder that drives the bucket into the face. Confirm your machine is a front shovel before ordering. If it is a backhoe, send us your serial number and we will identify the correct cylinder.

Q3: What is the difference between 707-E1-01870, 707-F1-01870 and 707-H1-X2630?

A: These are alternate Komatsu designations for the same front shovel bucket cylinder position, appearing in different revisions of the parts documentation. 707-H1-X2640 is also catalogued in the same group. We supply against any of these numbers; send us your full machine serial number and we will confirm which specification applies to your unit before production.

Q4: What is Demag part number 92229040?

A: It is the same cylinder. The Komatsu PC2000 front shovel platform descends from the Demag mining excavator line, and Komatsu Mining GmbH retained the eight-digit Demag numbering alongside the Komatsu system. 92229040 (also written DM92229040) and 707-E1-01870 refer to the same bucket cylinder. Be aware that supplier listings often publish all four PC2000 front shovel Demag numbers together — 92227040, 92228040, 92229040 and 92384040 — as though interchangeable. They are the boom, arm, bucket and clam cylinders respectively. Only 92229040 is the bucket cylinder.

Q5: 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, eye bushings 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 front shovel bucket cylinders, eye-bushing and rod replacement are the most common single-item orders, since compressive shock damages the eyes and rod before the barrel reaches service limit. Send us your machine serial number and the component you need for a quotation.