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    AI Overview
    The JCB JS200 excavator boom cylinder is a high-pressure hydraulic component, often with a 125mm bore and 85mm rod, designed to control vertical boom movement. Common seal kits for rebuilding these cylinders include part numbers 331/39036 and 336/A0124. Replacements and repair kits are available from suppliers like AMS Parts. 
    Key Details for JS200 Boom Cylinder: 
    • Function: Controls the vertical, up-and-down motion of the main boom arm.
    • Dimensions: Typically features a 125mm bore and 85mm rod diameter.
    • Common Seal Kits:
      • 331/39036: Fits JS200/JS220 boom, arm, and bucket cylinders.
      • 336/A0124: Often specified for JS200 boom cylinders.
    • Compatibility: Suitable for various JS200 LC models (e.g., serial numbers 0704002 - 0705000).
    • Repair Focus: Frequently requires replacement of the rod seal, buffer seal, and wiper seal due to high-stress operation. 
    This video shows how to rebuild a hydraulic cylinder on a JCB excavator:
    Related video thumbnail
    15m
    How to rebuild a hydraulic cylinder on JCB
    Avicom
    YouTube• Feb 21, 2022
    Replacement cylinders are available, with options for new aftermarket or used components. 
    • For JCB JS200 JCB200 BOOM ARM BUCKET Excavator Cylinder ...
      For JCB JS200 JCB200 BOOM ARM BUCKET Excavator Cylinder Seal kits 331/39036. ... 4 interest-free payments of $20.74 available with...
      eBay
    • 331-39036 331/39036 JS200 Boom Cylinder Seal Kit for JCB ... - eBay
      331-39036 331/39036 JS200 Boom Cylinder Seal Kit for JCB Excavator.
      eBay
    • Boom Cylinder Seal Kit 336/A0124 For JCB Excavator JS200 JS220
      Boom Cylinder Seal Kit 336/A0124 For JCB Excavator JS200 JS220.
      eBay
    • Boom Cylinder Seal Kit 336/A0124 for JCB Excavator JS200 JS220
      Choose options for shipping rates. ... Chosen by over 100,000 customers for trusted quality and exceptional service. Enjoy a full ...
      FridayParts
    • Js130 Js200 Js130LC Js200sc Js305 Js130LC Js140 Js145 Js160 ...
      JS130 JS200 JS130LC JS200SC Excavator hydraulic cylinder. ... 2. Heat treatment: Quenching&Tempering which makes the piston rod su...
      Made-in-China.com
    • How to rebuild a hydraulic cylinder on JCB
      Feb 21, 2022 — today we're going to fix leaking cylinders in this bucket. so first you have to do is remove the bolt that holds your pin remove t...
      15m
      YouTube·Avicom
    • What are hydraulic-cylinders for your backhoe?
      Aug 13, 2025 — Boom Cylinder: Controls the vertical up-and-down motion of the boom arm. Stick/Dipper Cylinder: Governs the extension and retracti...
      www.aisoarhydraulics.com
    • JCB JS200 LC Excavator Boom Cylinder Seal Kit
      Description · Cylinder Rebuild/Repair Seal Kit for JCB JS200 LC Excavators · Serial Numbers: 0704002 - 0705000; · Cylinder #s: · R...
      HW Part Store
    • JCB JS200 Excavator Hydraulic Cylinders - AMS Parts
      Looking for JCB JS200 Excavator Hydraulic Cylinders? We sell a wide range of new aftermarket, used and rebuilt JS200 replacement h...
      amsparts.com
    • For JCB JS200 JCB200 BOOM ARM BUCKET Excavator Cylinder ...
      For JCB JS200 JCB200 BOOM ARM BUCKET Excavator Cylinder Seal kits 331/39036. ... 4 interest-free payments of $20.74 available with...
      eBay
    • 331-39036 331/39036 JS200 Boom Cylinder Seal Kit for JCB ... - eBay
      331-39036 331/39036 JS200 Boom Cylinder Seal Kit for JCB Excavator.
      eBay
    • Boom Cylinder Seal Kit 336/A0124 For JCB Excavator JS200 JS220
      Boom Cylinder Seal Kit 336/A0124 For JCB Excavator JS200 JS220.
      eBay
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    Web results

    JCB JS200 excavator boom cylinder


    Xiamen Fortune Industrial Co., Ltd.
    https://www.fortunepart.com › jcb-js200-excavator-boo...
    Xiamen Fortune Industrial Co., Ltd.
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    AMS Parts
    https://amsparts.com › js200 › hydraulic-cylinders › parts
    AMS Parts
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    Web results

    Track Excavator Bucket Cylinder Boom Arm ...


    Alibaba.com
    https://www.alibaba.com › product-detail › track-excav...
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    Track Excavator Bucket Cylinder Boom Arm Cylinder for JCB JS200 JS220 JS330 Machinery Parts ; MOQ. 1 PCS ; Delivery time. 2-5 days for stock, 15-30 days for bulky ...Read more
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    JCB JS200 LC Excavator Boom Cylinder Seal Kit


    HW Part Store
    https://hwpartstore.com › products › jcb-js200-lc-excavat...
    HW Part Store
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    Description · Cylinder Rebuild/Repair Seal Kit for JCB JS200 LC Excavators · Serial Numbers: 0704002 - 0705000; · Cylinder #s: · Rod: 85 mm · Bore: 125 mm.Read more
    $602.69 · In stock · Free delivery · 30-day returns
    People also ask
    How much does a JCB JS200 excavator weight?
    45621 lbs.
    How much does a JCB JS200 Excavator weigh? The standard operating weight for a JCB JS200 Excavator is 45621 lbs. This height can vary depending on the machine configuration and attachments.

    JCB JS200 Excavator Specs: Dimensions & Weight - VeriTread


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    https://www.veritread.com › construction › excavators
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    What are the common problems with a mini JCB?
    Below is a list of common problems with potential causes and solutions for the JCB 35Z Mini Excavator.
    • Engine Starting Problems.
    • Hydraulic System Issues.
    • Electrical System Malfunctions.
    • Track or Undercarriage Problems.
    • Overheating.
    • Boom or Arm Drift.
    • Excessive Fuel Consumption.
    • Control Lever Stiffness or Malfunction.
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    JCB 35Z Mini Excavator - HTS Plant Sales


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    What is a boom cylinder?
    Part of a video titled How an Excavator Boom Moves | Hydraulic Cylinder Explained #blince
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    YouTube·
    Dec 2, 2025

    How an Excavator Boom Moves | Hydraulic Cylinder Explained #blince

    YouTube·Blince hydraulic·Dec 2, 2025
    YouTube
    In this video
    "...However allows fluid to enter from both ends by changing which side gets pressure you can control the piston rod in both directions. Excavators use double acting cylinders...."
    From 0:00
    Part of a video titled How an Excavator Boom Moves | Hydraulic Cylinder Explained #blince
    However allows fluid to enter from both ends by changing which side gets pressure you can controlMoreHowever allows fluid to enter from both ends by changing which side gets pressure you can control the piston rod in both directions. Excavators use double acting cylinders.

    How an Excavator Boom Moves | Hydraulic Cylinder Explained #blince


    YouTube
    https://www.youtube.com · Blince hydraulic
    YouTube
    https://www.youtube.com · Blince hydraulic
    What is the lifespan of a JCB excavator?
    It's possible for your team to use an excavator anywhere from 7,000 to 10,000 hours before a replacement is necessary. It's important to note that by the time you reach the 10,000-hour mark, you'll likely have completed several large-scale repairs to undercarriage components and tracks.

    The Average Life Span of Construction Equipment


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    Web results

    Js130 Js200 Js130LC Js200sc Js305 ...


    Made-in-China.com
    https://breakerhammerparts.en.made-in-china.com › Ch...
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    Product name. JS130 JS200 JS130LC JS200SC Excavator hydraulic cylinder. Condition, 100% new. Color, Yellow or Black & Customized. Material, 50Mn.Read more
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    JCB JS200 & JS210 Excavator Boom Cylinder Seal Kit


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    YuJa
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    JCB Series Excavator Hydraulic Cylinder


    yoonadhydraulics.com
    https://www.yoonadhydraulics.com › jcb-series-excavat...
    yoonadhydraulics.com
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    JCB JS200 Excavator hydraulic problem


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    Jun 9, 2020 — I'm having a problem with my hydraulics on my 2010 JCB JS200 excavator. This problem started after my valve bank got reconditioned.Read more

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    eBay
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    For JCB JS200 JCB200 BOOM ARM BUCKET Excavator Cylinder Seal kits 331/39036 ; Item number. 317511815813 ; Hign-concerned Chemical. None ; Material. RUBBER ; Est.Read more
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