Bucket Cylinder for Komatsu Mid-size Excavator PC240LC-8MO
Bucket Cylinder for Komatsu Mid-size Excavator PC240LC-8MO
The Komatsu mid-size PC240LC-8MO excavator bucket cylinder is a precision-replacement hydraulic cylinder engineered for direct OEM-fit installation on Komatsu mid-size excavators. This Komatsu bucket cylinder matches the original bore diameter, stroke length, rod specification, port thread, and mounting pin geometry of the Komatsu OEM component, ensuring direct-fit compatibility without modification to the Komatsu PC240LC-8MO excavator hydraulic circuit or attachment structure.
Key Technical Facts
- ✦ Cylinder type: Bucket cylinder for Komatsu mid-size excavator PC240LC-8MO — double-acting, OEM-fit replacement
- ✦ Bore range: 100–160 mm — rod diameter 70–115 mm, working pressure 25–35 MPa
- ✦ Stroke range: 700–1,100 mm — push force 196–700 kN at max pressure
- ✦ Seal package: PU wiper seal + dual-lip NBR rod seal — High-frequency wiper seal for construction and quarrying duty
- ✦ Manufacturing standard: Bore H8 tolerance, rod Ra ≤ 0.2 μm hard chrome, 100% pressure test at 1.5× rated pressure
- ✦ Supply: 3–7 working days standard catalog sizes · Custom bore-stroke 15–25 working days · ISO 9001:2015
Komatsu Mid-size Excavator Bucket Cylinder — Technical Overview
In Komatsu mid-size excavator PC240LC-8MO applications, the bucket cylinder performs transmit bucket curl and crowd force at high dig cycle frequency under high-impact cyclic loads during bucket penetration and crowd conditions throughout every work cycle. The hydraulic system pressure on Komatsu excavators reaches 35 MPa under peak loading, requiring a bucket cylinder with a barrel bore ground to H8 tolerance and a chrome-plated rod with surface finish Ra ≤ 0.2 μm. These two specifications — bore tolerance and rod finish — are the primary determinants of seal life and cylinder service interval on any Komatsu machine.
Port thread integrity is a frequently overlooked factor in Komatsu PC240LC-8MO bucket cylinder replacement. Komatsu excavators use either BSP (British Standard Pipe) or JIS B 8355 port threads depending on manufacturing year and market. Mismatched port threads in a Komatsu excavator hydraulic system cause micro-leakage at the fitting interface, air ingestion, and cavitation in the hydraulic pump. Our Komatsu bucket cylinders are supplied with port threads matching the original Komatsu OEM specification for the PC240LC-8MO series — BSP or JIS as appropriate — verified at order stage.
For a complete listing of Komatsu excavator bucket cylinders, see our bucket cylinder category page. Technical guidance on identifying which components are failing is in our hydraulic cylinder bypass diagnostic guide.
OEM Compatibility — Komatsu PC240LC-8MO: This bucket cylinder is manufactured to match the Komatsu OEM bore, stroke, rod diameter, port thread standard, and mounting pin geometry for the PC240LC-8MO series. The replacement Komatsu bucket cylinder installs directly into the Komatsu PC240LC-8MO excavator without machining, shimming, or modification. Provide the Komatsu OEM part number when ordering for dimensional verification before despatch. Non-standard Komatsu PC240LC-8MO variants — including long-reach and heavy-lift arm configurations — are available as custom-manufactured units within 15 to 25 working days.
OEM vs Replacement — Komatsu Excavator Bucket Cylinder Comparison
Seal Package — Komatsu PC240LC-8MO Bucket Cylinder
The Komatsu PC240LC-8MO bucket cylinder seal package consists of: a PU (polyurethane) rod wiper seal that excludes abrasive particles from the chrome rod surface on retraction; a primary PU or NBR rod seal that retains hydraulic oil under working pressure; NBR O-rings at the port fittings and end-cap interface; and a polyurethane piston seal that maintains the pressure differential between cap-end and rod-end chambers. Standard seals are rated for mineral hydraulic oil (ISO VG 32–68) at −20 °C to +80 °C continuous operation. For cold-climate Komatsu excavator operation below −20 °C, specify PU/NBR-55 low-temperature compound. For high-temperature or fire-resistant fluid applications, FKM (Viton) seals are available on request. The full seal kit for the Komatsu PC240LC-8MO bucket cylinder is available separately — contact us with the Komatsu OEM part number to verify compatibility. See our hydraulic cylinder parts and seal guide for further information on seal selection.
Step 1 — Identify cylinder position: bucket cylinder (between the arm tip and bucket linkage)
Step 2 — Locate OEM part number: stamped on cylinder barrel or listed in Komatsu PC240LC-8MO service manual
Step 3 — If part number not available: measure bore diameter (inside barrel), rod diameter (chrome surface),
stroke length (extended minus retracted), and collapsed length (pin-to-pin fully retracted)
Step 4 — Verify pin diameters at cap end and rod end — note mounting style (pin-eye, clevis, flange)
Step 5 — Submit OEM part number or measurements — receive compatibility verification and price within 24 hours
Komatsu Bucket Cylinder — Specification Reference:
Bore range: 100–160 mm Rod diameter: 70–115 mm
Stroke range: 700–1,100 mm Working pressure: 25–35 MPa
Push force: 196–700 kN at max working pressure
Application Areas — Komatsu Excavator Bucket Cylinder
Verify dimensions before ordering: Komatsu excavator bucket cylinders vary in bore, stroke, rod diameter, and pin geometry between model series and production years. Always supply the Komatsu OEM part number or a full dimensional drawing to verify correct supply. Our engineering team verifies compatibility against Komatsu dimensional data before processing every order.
When to replace vs reseal: Reseal the Komatsu PC240LC-8MO bucket cylinder when rod seal leakage is present but the chrome rod surface is undamaged (no pitting, scoring, or peeling). Replace the full cylinder if: (1) chrome rod shows scoring deeper than 0.3 mm; (2) bore is out-of-round beyond 0.05 mm; (3) cylinder fails to hold load under pressure (internal bypass); or (4) barrel shows bending or weld failure. A damaged chrome rod will destroy any new seal set within 200 to 500 operating hours.
Installation Guidelines — Komatsu PC240LC-8MO Bucket Cylinder
Safe Komatsu PC240LC-8MO bucket cylinder replacement requires full hydraulic pressure relief before disconnecting any fittings. With the attachment lowered and engine off, cycle all control levers to release stored accumulator pressure. Photograph the original hydraulic line routing before removal. Note the Komatsu OEM port thread standard (BSP or JIS) so replacement line fittings are correctly matched. After installing the replacement Komatsu bucket cylinder and reconnecting hoses, check for correct port orientation — reversed cap/rod port connections will cause the bucket cylinder to operate in the wrong direction.
For pre-replacement diagnostics on the Komatsu PC240LC-8MO, refer to our cylinder bypass diagnostic guide. Review our manufacturing quality standards for full details of our production and testing process.
Manufacturing Capability: Ever-Power Huachang
Our engineering team has direct experience with Komatsu excavator hydraulic systems across the PC28MR to PC1250 range for Komatsu and the 301.7 to 395 range for Caterpillar. This depth of model-specific knowledge allows us to verify port thread standard, pin bore diameter, lug geometry, and collapsed length for each Komatsu PC240LC-8MO bucket cylinder before despatch — not just bore and stroke. Customers who provide the Komatsu OEM part number receive a compatibility confirmation email before their order is processed.
Learn more about our manufacturing facility and engineering team on our company capability page.
Frequently Asked Questions: Komatsu PC240LC-8MO Bucket Cylinder
Komatsu Excavator Cylinder — OEM Replacement Program
Get the Komatsu PC240LC-8MO Bucket Cylinder — Factory Direct
Ever-Power Huachang supplies Komatsu excavator bucket cylinders direct from our Hangzhou manufacturing facility. No distributor markup. Provide your Komatsu OEM part number for immediate pricing. ISO 9001:2015 certified, 100% pressure tested, serialised test certificate included.
✉ Contact Us · Manufacturing Capabilities · ISO 9001:2015 · 3–7 day standard lead time · 60+ countries served
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