707-E1-01850 Komatsu PC2000-8 Front Shovel Arm Cylinder Aftermarket

Product Overview

SEIGO’s aftermarket arm cylinder, part number 707-E1-01850, 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 by Komatsu under the alternate designation 707-F1-01850, and carries the Demag / Komatsu Mining part number 92228040 — 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.

The arm cylinder is the crowd actuator on a loading shovel. It drives the bucket horizontally into the face and generates the breakout force that fills the bucket — the single highest-demand hydraulic event in the entire dig cycle. Unlike a backhoe arm cylinder, which works with gravity assisting the dig, a front shovel arm cylinder works entirely against the resistance of a solid face, at bench level, with the machine braced against the reaction load. The result is a duty profile dominated by high-pressure crowd strokes interrupted by shock loading when the bucket meets unbroken rock or oversize.

This is why arm cylinders are typically the first work equipment cylinder to require seal service on a PC2000 front shovel. The failure sequence is consistent: repeated pressure spikes extrude the rod seal, contamination then enters past the compromised wiper, and rod chrome scoring follows. Rod surface hardness and buffer seal specification are therefore the two variables that determine service interval on this position more than any other.

SEIGO manufactures the 707-E1-01850 to full OEM dimensional specification, with a 42CrMo4 quenched-and-tempered, deep induction-hardened, hard chrome-plated piston rod and an ST52 / E355 high-strength honed steel barrel. Premium NOK buffer seals and U-cups are fitted as standard, selected specifically for pressure-spike tolerance rather than general-purpose sealing. Heavy-duty composite guide bushings handle the radial load generated during the crowd stroke. 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 cylinder on the same machine is a different part — 707-E1-01830 (Demag 92227040). The two are not interchangeable. See the cross-reference table below for the complete PC2000 front shovel cylinder group.

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. If your parts book or inventory system holds these cylinders under the eight-digit Demag / Komatsu Mining numbering, quote the eight-digit number and we will match it to the correct position. Cylinder position within the front shovel work equipment group should be confirmed against your machine parts book and serial number before ordering.

Backhoe Configuration — Different Part Numbers

If your PC2000-8 is a backhoe machine rather than a front shovel, none of the numbers above apply:

The PC2000-11 is a separate generation and uses a different cylinder series again (707-G1 and 707-H1 numbers, for example 707-G1-05760 boom and 707-G1-05780 mid-arm). If you operate a PC2000-11, send us your full machine serial number and we will confirm the correct cylinder before you order.

Key Features & Durability

• Enhanced Impact Resistance: The piston rod utilizes quenched and tempered 42CrMo4 steel with deep induction hardening to resist bending and surface damage from rock debris.

• High-Pressure Performance: Fitted with premium NOK buffer seals and U-cups, specifically selected to handle pressure spikes during hard digging cycles without leakage.

• Mining-Grade Bushings: Equipped with heavy-duty composite bushings to handle high radial loads and reduce friction wear during the crowding motion.

• Plug-and-Play Installation: Strictly manufactured to OEM connection dimensions (pin eye to pin eye) for seamless replacement of the original 707-E1-01850 unit.

Applications

• Open-pit coal mining

• Iron ore extraction

• Overburden removal

• Heavy earthmoving projects

FAQ

Q1: What determines the crowd force delivered by 707-E1-01850?

A: Crowd force at the bucket is a function of three things: system working pressure at the implement circuit, the effective piston area of the arm cylinder, and the mechanical advantage of the front linkage geometry at the point in the stroke where the bucket engages the face. Because the linkage ratio changes continuously through the crowd stroke, peak crowd force is not a single constant — it occurs at a specific linkage angle. Our cylinder is manufactured to OEM bore and rod dimensions, so it reproduces the original force curve across the full stroke. If you need the calculated force figure for a specific machine configuration and stroke position, send us your machine serial number and our engineering team will provide it.

Q2: How often does 707-E1-01850 need seal service?

A: In continuous shovel operation on hard ore, plan seal service every 4,000-6,000 operating hours. With HVOF coated rod and low-temp seal package, seal life extends to 6,000-8,000 hours.

Q3: Is your 707-E1-01850 Komatsu-genuine-compatible?

A: Yes. Our cylinder is built to Komatsu OEM drawing specifications and uses the same mounting dimensions, port locations, and thread standards. It is a drop-in replacement.

Q4: What is Demag part number 92228040, and is it the same as 707-E1-01850?

A: Yes. The Komatsu PC2000 front shovel platform descends from the Demag mining excavator line, and Komatsu Mining GmbH retained the original eight-digit Demag numbering alongside the Komatsu system. 92228040 (also written DM92228040) and 707-E1-01850 refer to the same front shovel arm cylinder. Many long-established open-pit operations still hold this cylinder under the Demag number in their maintenance systems, so both numbers appear on our documentation and packaging.

Q5: I have seen 92227040 listed alongside this cylinder — is that also the arm cylinder?

A: No. 92227040 is the Demag number for the front shovel boom cylinder, which is Komatsu 707-E1-01830. The four PC2000 front shovel work equipment cylinders correspond one-to-one with four Demag numbers: 92227040 (boom), 92228040 (arm / stick), 92229040 and 92384040. Suppliers frequently publish all eight numbers together as though they were interchangeable alternatives for a single part. They are not — they are four different cylinders on the same machine. If you are ordering against a Demag number, confirm the position before raising the purchase order.

Q6: Does 707-E1-01850 fit the PC2000-11?

A: No. The PC2000-11 is a later generation and uses a different work equipment cylinder series — 707-G1 and 707-H1 numbers, for example 707-G1-05760 for the boom cylinder and 707-G1-05780 for the mid-arm cylinder. Part 707-E1-01850 is specified for the PC2000-8. SEIGO manufactures cylinders for both generations; send us your full machine serial number and we will confirm the correct part number for your machine before production.

Q7: 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, guide bushings and seal kit as individual items and supplies them to hydraulic repair shops and 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 arm cylinders specifically, rod-only replacement is common — the barrel often survives several rod service cycles. Send us your machine serial number and the component you need for a quotation.