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Boom Cylinder for Caterpillar Large Excavator E336D

Boom Cylinder for Caterpillar Large Excavator E336D

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Boom Cylinder for Caterpillar Large Excavator E336D

Boom cylinder for Caterpillar large E336D excavator — OEM replacement hydraulic cylinder
OEM-specification replacement boom cylinder for Caterpillar Large excavator E336D — direct-fit, pressure tested, factory direct supply
Parameter Specifikace Notes
Cylinder type Boom cylinder — double-acting OEM-equivalent replacement for Caterpillar E336D
Aplikace Caterpillar Large excavator E336D Direct-fit, no modification required
Bore range 160–250 mm Matches OEM bore diameter, H8 honed tolerance
Rod diameter 115–180 mm C45 induction-hardened, hard chrome plated, Ra ≤ 0.2 μm
Stroke range 1,300–1,800 mm OEM-matched stroke lengths for all Caterpillar E336D variants
Provozní tlak 30–35 MPa 250–350 bar continuous duty rating
Push force range 603–1,718 kN At maximum working pressure — full bore area
Seal package PU rod seal + NBR piston seal High-pressure large-bore compound, compatible with ISO VG 46–68 mineral oil
Port thread BSP / JIS — OEM matched Verified against Caterpillar E336D 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
Certifications ISO 9001:2015 · ISO 14001 · ISO 45001 Full material traceability available on request

The Caterpillar large E336D excavator boom cylinder is a precision-replacement hydraulic cylinder engineered for direct OEM-fit installation on Caterpillar large excavators. This Caterpillar boom 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 E336D excavator hydraulic circuit or attachment structure.

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

Key Technical Facts

  • ✦ Cylinder type: Boom cylinder for Caterpillar large excavator E336D — double-acting, OEM-fit replacement
  • ✦ Bore range: 160–250 mm — rod diameter 115–180 mm, working pressure 30–35 MPa
  • ✦ Stroke range: 1,300–1,800 mm — push force 603–1,718 kN at max pressure
  • ✦ Seal package: PU rod seal + NBR piston seal — High-pressure large-bore compound, compatible with ISO VG 46–68 mineral oil
  • ✦ 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 Large Excavator Boom Cylinder — Technical Overview

On the Caterpillar large excavator E336D, the boom cylinder connects the between the upperstructure and large boom on paired mounting and delivers support and elevate the full boom assembly under maximum load under high sustained pressure with dynamic crowd loading during production digging loading conditions. Caterpillar designs its excavator hydraulic circuits for high-cycle reliability: the boom cylinder must maintain consistent bore geometry, rod surface finish, and seal integrity across tens of thousands of operating hours. Our replacement Caterpillar boom cylinder is manufactured to these same OEM dimensional and surface-finish standards.

Internal bypass in a Caterpillar E336D boom cylinder — where hydraulic oil transfers from the cap-end chamber to the rod-end chamber past the piston seal — reduces available crowd force and increases cycle time. A 10% bypass loss on a Caterpillar mid-range excavator boom cylinder reduces bucket penetration force by approximately the same proportion, reducing dig productivity. Our piston seals use PU compound with controlled interference fit to the bore, maintaining effective sealing at pressures from 5 MPa to 35 MPa across the operating temperature range.

For a complete listing of Caterpillar excavator boom cylinders, see our boom cylinder category page. Technical guidance on identifying which components are failing is in our hydraulic cylinder bypass diagnostic guide.

Caterpillar excavator boom cylinder — typical field application
Caterpillar Large excavator boom cylinder in field operation — support and elevate the full boom assembly under maximum load

OEM Compatibility — Caterpillar E336D: This boom cylinder is manufactured to match the Caterpillar OEM bore, stroke, rod diameter, port thread standard, and mounting pin geometry for the E336D series. The replacement Caterpillar boom cylinder installs directly into the Caterpillar E336D excavator without machining, shimming, or modification. Provide the Caterpillar OEM part number when ordering for dimensional verification before despatch. Non-standard Caterpillar E336D 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 Boom Cylinder Comparison

* Ever-Power Huachang supplies OEM-equivalent dimensional accuracy at aftermarket pricing, with 100% pressure test certification.
Specifikace Ever-Power Replacement (this product) Caterpillar OEM E336D
Průměr otvoru OEM-matched, H8 honed Caterpillar OEM bore specification
Rod diameter OEM-matched, Ra ≤ 0.2 μm hard chrome Caterpillar OEM rod specification
Port thread standard BSP / JIS — verified to Caterpillar E336D 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 E336D Boom Cylinder

Excavator hydraulic cylinder seal kit — PU wiper NBR piston seal components for Caterpillar E336D
Caterpillar excavator boom cylinder seal kit components — PU wiper seal · NBR rod seal · piston seal · O-rings · guide bushing

The Caterpillar E336D boom 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 E336D boom 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 boom cylinder (left) showing chrome rod damage vs new OEM-specification replacement (right)
Caterpillar E336D Boom Cylinder — Replacement Selection Process:
Step 1 — Identify cylinder position: boom cylinder (between the upperstructure and large boom on paired mounting)
Step 2 — Locate OEM part number: stamped on cylinder barrel or listed in Caterpillar E336D 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 Boom Cylinder — Specification Reference:
Bore range: 160–250 mm Rod diameter: 115–180 mm
Stroke range: 1,300–1,800 mm Working pressure: 30–35 MPa
Push force: 603–1,718 kN at max working pressure

Application Areas — Caterpillar Excavator Boom Cylinder

Aplikace Details
Stavební stroje Raising and positioning the front attachment on Caterpillar E336D during earthmoving and foundation work
Těžební operace Heavy lift and material positioning in open-pit and underground mining with Caterpillar E336D
Large Infrastructure Deep foundation, large-scale earthmoving and slope stabilisation using Caterpillar boom cylinder power
Equipment Maintenance Lowering front attachment for service access — Caterpillar E336D boom cylinder must hold load without drift

Verify dimensions before ordering: Caterpillar excavator boom 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 E336D boom 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 E336D Boom Cylinder

When replacing the boom cylinder on a Caterpillar E336D excavator, lower all attachments to the ground and engage the hydraulic lock before beginning work. Relieve residual pressure by moving all control levers with the engine off. Label hydraulic hose connections before removal — cap-end and rod-end port connections must be reinstalled correctly on a double-acting boom cylinder. Fit the replacement Caterpillar boom cylinder with both mounting pins greased and retention hardware in place. After hydraulic reconnection, inspect all port connections for thread engagement before starting the engine.

For pre-replacement diagnostics on the Caterpillar E336D, 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

Our Caterpillar excavator boom cylinder range is one of our core product lines, with stock maintained for all standard Caterpillar E336D sizes. Ever-Power Huachang operates a 60,000 m² manufacturing facility in Hangzhou, China, certified to ISO 9001:2015, ISO 14001:2015, and ISO 45001:2018. The Caterpillar boom cylinder production cell includes CNC boring machines, external cylindrical grinding, automated chrome plating, controlled seal assembly stations, and a dedicated pressure-test bay. Our 3,000+ completed projects across construction, mining, and infrastructure sectors include long-term supply agreements with major equipment rental fleets.

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

Frequently Asked Questions: Caterpillar E336D Boom Cylinder

How do I identify the correct boom cylinder for my Caterpillar E336D?
The most reliable method is to locate the OEM part number stamped on the cylinder barrel or listed in the Caterpillar E336D 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 boom cylinder from our drawing database within 24 hours.
What is the difference between OEM and aftermarket Caterpillar E336D boom cylinders?
An OEM Caterpillar boom 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 boom 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 E336D boom 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 E336D boom cylinder.
How long does a replacement Caterpillar E336D boom 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 boom 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 E336D boom cylinder?
Standard catalog Caterpillar boom cylinders ship within 3 to 7 working days ex-works Hangzhou for the most common Caterpillar E336D sizes. Less common Caterpillar E336D 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 E336D boom cylinder without removing the front attachment?
Boom cylinder replacement on the Caterpillar E336D 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 E336D 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 E336D service manual for the correct boom cylinder replacement procedure for your specific machine configuration.
Does the Caterpillar E336D boom cylinder come with a warranty?
Yes. Ever-Power Huachang Caterpillar excavator boom 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

Request a Quote — Caterpillar Excavator Boom Cylinder

Submit your Caterpillar E336D boom cylinder requirement with model number or dimensional drawing. Volume pricing applies for orders of five or more units. Response within 24 hours from our engineering sales team.

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