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Bucket Cylinder for Caterpillar Compact Excavator E306EZ

Bucket Cylinder for Caterpillar Compact Excavator E306EZ

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Bucket Cylinder for Caterpillar Compact Excavator E306EZ

Bucket cylinder for Caterpillar compact E306EZ excavator — OEM replacement hydraulic cylinder
OEM-specification replacement bucket cylinder for Caterpillar Compact excavator E306EZ — direct-fit, pressure tested, factory direct supply
Parameter Specification Notes
Cylinder type Bucket cylinder — double-acting OEM-equivalent replacement for Caterpillar E306EZ
Ansökan Caterpillar Compact excavator E306EZ Direct-fit, no modification required
Bore range 60–130 mm Matches OEM bore diameter, H8 honed tolerance
Stångdiameter 45–90 mm C45 induction-hardened, hard chrome plated, Ra ≤ 0.2 μm
Stroke range 500–900 mm OEM-matched stroke lengths for all Caterpillar E306EZ variants
Working pressure 25–35 MPa 250–350 bar continuous duty rating
Push force range 70–370 kN At maximum working pressure — full bore area
Seal package PU wiper seal + dual-lip NBR rod seal Resists abrasive particle ingress in ground-engaging applications
Port thread BSP / JIS — OEM matched Verified against Caterpillar E306EZ port standard
Bore finish H8 tolerance, Ra 0.2–0.4 μm honed In-process air gauging on every barrel
Chrome thickness Minimum 25 μm hard chrome Eddy-current measured before seal assembly
Pressure test 100% at 1.5× rated pressure Dynamic test at 60 °C, serialised test certificate per unit
Certifieringar ISO 9001:2015 · ISO 14001 · ISO 45001 Full material traceability available on request

The Caterpillar compact E306EZ excavator bucket cylinder is a precision-replacement hydraulic cylinder engineered for direct OEM-fit installation on Caterpillar compact excavators. This Caterpillar bucket cylinder matches the original bore diameter, stroke length, rod specification, port thread, and mounting pin geometry of the Caterpillar OEM component, ensuring direct-fit compatibility without modification to the Caterpillar E306EZ excavator hydraulic circuit or attachment structure.

Excavator bucket cylinder structure — barrel bore piston rod seals end cap mounting pins
Bucket cylinder internal structure — key components and specifications for Caterpillar excavator replacement

Key Technical Facts

  • ✦ Cylinder type: Bucket cylinder for Caterpillar compact excavator E306EZ — double-acting, OEM-fit replacement
  • ✦ Bore range: 60–130 mm — rod diameter 45–90 mm, working pressure 25–35 MPa
  • ✦ Stroke range: 500–900 mm — push force 70–370 kN at max pressure
  • ✦ Seal package: PU wiper seal + dual-lip NBR rod seal — Resists abrasive particle ingress in ground-engaging applications
  • ✦ 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

Caterpillar Compact Excavator Bucket Cylinder — Technical Overview

The bucket cylinder on the Caterpillar E306EZ operates at the between the arm tip and bucket linkage and is responsible for control bucket curl and crowd force. Caterpillar excavator hydraulic systems operate at pressures up to 35 MPa, and the bucket cylinder must withstand peak impact loads up to 2× system relief pressure when the bucket strikes rock or concrete loads without internal bypass or external seal failure. Bore honing to H8 tolerance, rod chrome plating to Ra ≤ 0.2 μm, and matched seal geometry are the three manufacturing factors that determine whether a replacement Caterpillar bucket cylinder performs to Caterpillar OEM standard.

The Caterpillar E306EZ bucket cylinder operates with a dual-seal rod end: a primary PU rod seal retains hydraulic oil under pressure, and a polyurethane wiper seal excludes abrasive particles from the rod surface on retraction. In abrasive environments — open-cut mining, demolition, sandy ground — wiper seal condition is critical: a failed wiper seal allows grit to score the chrome rod surface within hours, triggering rapid primary seal failure. Our replacement Caterpillar bucket cylinders ship with a factory-installed PU/PU dual-seal rod end configuration, matched to Caterpillar OEM geometry.

For a complete listing of Caterpillar 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.

Caterpillar excavator bucket cylinder — typical field application
Caterpillar Compact excavator bucket cylinder in field operation — control bucket curl and crowd force

OEM Compatibility — Caterpillar E306EZ: This bucket cylinder is manufactured to match the Caterpillar OEM bore, stroke, rod diameter, port thread standard, and mounting pin geometry for the E306EZ series. The replacement Caterpillar bucket cylinder installs directly into the Caterpillar E306EZ excavator without machining, shimming, or modification. Provide the Caterpillar OEM part number when ordering for dimensional verification before despatch. Non-standard Caterpillar E306EZ variants — including long-reach and heavy-lift arm configurations — are available as custom-manufactured units within 15 to 25 working days.

Excavator hydraulic cylinder installation positions — boom arm bucket cylinder location
Excavator front attachment cylinder positions — Boom cylinder (upperstructure to boom) · Arm cylinder (boom to arm) · Bucket cylinder (arm tip to bucket linkage)

OEM vs Replacement — Caterpillar Excavator Bucket Cylinder Comparison

* Ever-Power Huachang supplies OEM-equivalent dimensional accuracy at aftermarket pricing, with 100% pressure test certification.
Specification Ever-Power Replacement (this product) Caterpillar OEM E306EZ
Borrdiameter OEM-matched, H8 honed Caterpillar OEM bore specification
Stångdiameter OEM-matched, Ra ≤ 0.2 μm hard chrome Caterpillar OEM rod specification
Port thread standard BSP / JIS — verified to Caterpillar E306EZ Caterpillar original port standard
Seal compound PU/NBR standard · FKM on request Caterpillar OEM seal type
Mounting pin bores OEM-matched — both ends verified Caterpillar original pin geometry
Pressure test 100% dynamic at 1.5× rated — certificated Caterpillar OEM production standard
Serial traceability Serial no. + full test and material record OEM documentation standard
Lead time 3–7 days standard catalog Dependent on Caterpillar dealer stock

Seal Package — Caterpillar E306EZ Bucket Cylinder

Excavator hydraulic cylinder seal kit — PU wiper NBR piston seal components for Caterpillar E306EZ
Caterpillar excavator bucket cylinder seal kit components — PU wiper seal · NBR rod seal · piston seal · O-rings · guide bushing

The Caterpillar E306EZ 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 Caterpillar 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 Caterpillar E306EZ bucket cylinder is available separately — contact us with the Caterpillar OEM part number to verify compatibility. See our hydraulic cylinder parts and seal guide for further information on seal selection.

Excavator hydraulic cylinder worn vs new — chrome rod condition showing replacement requirement
When to replace vs reseal — worn Caterpillar excavator bucket cylinder (left) showing chrome rod damage vs new OEM-specification replacement (right)
Caterpillar E306EZ Bucket Cylinder — Replacement Selection Process:
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 Caterpillar E306EZ 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

Caterpillar Bucket Cylinder — Specification Reference:
Bore range: 60–130 mm Rod diameter: 45–90 mm
Stroke range: 500–900 mm Working pressure: 25–35 MPa
Push force: 70–370 kN at max working pressure

Application Areas — Caterpillar Excavator Bucket Cylinder

Ansökan Details
Construction & Foundation Work Trenching, foundation digging, pile driving preparation and utility trench installation with Caterpillar E306EZ
Gruvdrift och stenbrytning Open-pit overburden removal, ore excavation and blast site cleanup using Caterpillar compact excavator
Demolition Structure demolition, concrete breaking and rebar sorting — high-impact duty for Caterpillar E306EZ bucket cylinder
Infrastructure Projects Pipeline trenching, road construction and utility installation with Caterpillar excavator bucket cylinder

Verify dimensions before ordering: Caterpillar excavator bucket cylinders vary in bore, stroke, rod diameter, and pin geometry between model series and production years. Always supply the Caterpillar OEM part number or a full dimensional drawing to verify correct supply. Our engineering team verifies compatibility against Caterpillar dimensional data before processing every order.

When to replace vs reseal: Reseal the Caterpillar E306EZ 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 — Caterpillar E306EZ Bucket Cylinder

The Caterpillar E306EZ bucket cylinder replacement procedure starts with front attachment stabilisation and hydraulic system depressurisation. Identify the cap-end port (larger port, supplies oil for extension) and rod-end port (smaller port, supplies oil for retraction) before disconnecting hoses. Mark each hose position. Install the replacement Caterpillar bucket cylinder with both pin bores greased, retention hardware fitted, and port connections verified against the original Caterpillar plumbing layout. Run the excavator through ten slow bucket cylinder cycles at idle to seat new seals before returning to full working pressure.

For pre-replacement diagnostics on the Caterpillar E306EZ, 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

Ever-Power Huachang hydraulic cylinder manufacturing facility — Caterpillar excavator cylinder production
Ever-Power Huachang — hydraulic cylinder manufacturing facility, Hangzhou, China · ISO 9001:2015 · ISO 14001 · ISO 45001 · 100% pressure tested

Ever-Power Huachang manufactures the Caterpillar E306EZ bucket cylinder on the same equipment and to the same dimensional standards as our OEM supply program. Our bore honing machines maintain H8 tolerance across production batches, verified by in-process air gauging. Rod plating thickness is measured by eddy-current gauge on every rod before assembly. The Caterpillar bucket cylinder carries a unique serial number linking it to its material certificate, machining records, and pressure-test data — available on request for maintenance record-keeping.

Learn more about our manufacturing facility and engineering team on our company capability page.

Frequently Asked Questions: Caterpillar E306EZ Bucket Cylinder

How do I identify the correct bucket cylinder for my Caterpillar E306EZ?
The most reliable method is to locate the OEM part number stamped on the cylinder barrel or listed in the Caterpillar E306EZ service manual parts list. If the number is worn or unavailable, measure: (1) bore diameter — inside the barrel after cleaning; (2) rod diameter — outside diameter of the chrome surface; (3) stroke — fully extended length minus fully retracted length; (4) collapsed length — pin-to-pin or mounting-face-to-mounting-face fully retracted. Note pin diameters at both mounting ends. Supply these four dimensions and we will identify the correct Caterpillar bucket cylinder from our drawing database within 24 hours.
What is the difference between OEM and aftermarket Caterpillar E306EZ bucket cylinders?
An OEM Caterpillar bucket cylinder is manufactured by Caterpillar or its designated OEM supplier and supplied through the Caterpillar dealer network. An aftermarket replacement — such as our Ever-Power Huachang unit — is manufactured by an independent producer to the same dimensional specification. The key performance factors — bore tolerance, rod chrome finish Ra ≤ 0.2 μm, seal compound selection, and pressure test standard — are the same for both. The primary practical difference is price and lead time: aftermarket Caterpillar bucket cylinders are typically 30 to 50% lower cost and available with shorter lead times than Caterpillar dealer parts.
What seal material should I specify for my Caterpillar E306EZ bucket cylinder?
Standard supply includes PU (polyurethane) rod wiper seals and NBR (nitrile) piston seals, rated for mineral hydraulic oil (ISO VG 46) at −20 °C to +80 °C. For Caterpillar excavator operation in cold climates below −20 °C, specify PU/NBR-55 low-temperature compound. For high-ambient-temperature environments (steel plants, foundries, hot-climate mining) above +45 °C, specify FKM (Viton) seals rated to +150 °C continuous. Specify your operating environment when ordering and we will supply the correct seal compound for your Caterpillar E306EZ bucket cylinder.
How long does a replacement Caterpillar E306EZ bucket cylinder last?
Service life depends primarily on operating environment and maintenance practice. In standard construction applications with regular hydraulic oil changes and correct filtration (10 micron return line filter), a properly specified Caterpillar bucket cylinder with Ra ≤ 0.2 μm chrome rod and correctly selected seal compound can achieve 5,000 to 10,000 operating hours before seal replacement is required. In abrasive environments — sandy ground, demolition dust, open-cut mining — wiper seal condition should be checked every 500 hours, as a failed wiper seal will score the chrome rod and dramatically reduce subsequent seal life.
What is the lead time for a Caterpillar E306EZ bucket cylinder?
Standard catalog Caterpillar bucket cylinders ship within 3 to 7 working days ex-works Hangzhou for the most common Caterpillar E306EZ sizes. Less common Caterpillar E306EZ variants may require 7 to 15 working days. Custom bore-and-stroke combinations or non-standard port configurations require 15 to 25 working days depending on material availability. Contact us with your Caterpillar OEM part number for specific stock status and verified delivery time.
Can I fit this Caterpillar E306EZ bucket cylinder without removing the front attachment?
Bucket cylinder replacement on the Caterpillar E306EZ typically requires front attachment removal or at minimum controlled lowering to a safe position. The hydraulic circuit must be fully depressurised before disconnecting any fittings — residual accumulator pressure can cause serious injury. Depending on the Caterpillar E306EZ variant, the cylinder mounting pins may be accessible from ground level or may require the attachment to be positioned in a specific angle for pin extraction. Refer to the Caterpillar E306EZ service manual for the correct bucket cylinder replacement procedure for your specific machine configuration.
Does the Caterpillar E306EZ bucket cylinder come with a warranty?
Yes. Ever-Power Huachang Caterpillar excavator bucket cylinders are warranted against defects in materials and workmanship. Each cylinder is supplied with a serialised 100% pressure-test certificate — the serial number links to the full production record including material certificates, machining data, and pressure-test results. Warranty claims require the cylinder serial number and a description of the failure mode. For catastrophic failures within the warranty period, we request the failed cylinder be returned for inspection. Contact our after-sales team with the serial number for warranty assessment.

Caterpillar Excavator Cylinder — OEM Replacement Program

Enquire About the Caterpillar E306EZ Bucket Cylinder

Contact our engineers with the Caterpillar OEM part number or bore × rod × stroke specification. We verify compatibility against our Caterpillar drawing database and verify pricing, availability, and delivery timeline within one business day.

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