01 · UNDERCARRIAGE四轮一带是什么What “four wheels and a belt” means
“四轮一带”是国内维修行业对履带式底盘的通俗叫法：四种轮——引导轮、托链轮、支重轮、驱动齿圈，加上一条履带（链轨与履带板）。挖掘机和推土机的行走、承重与牵引都靠它完成。In the Chinese service trade, the crawler undercarriage is nicknamed “four wheels and a belt”: four kinds of wheel — idler, carrier roller, track roller and sprocket — plus the track itself (links and shoes). It carries the machine’s weight and delivers travel and traction on excavators and dozers.
几个部件之间是“咬合”关系：驱动齿圈带动链轨转动，链轨在引导轮、托链轮和支重轮上滚过，履带板再把整机重量传到地面。任何一处磨损，都会改变其它部件的受力。These parts work as a meshed system: the sprocket drives the track links, the links roll over idler, carrier and track rollers, and the shoes transfer the machine’s weight to the ground. Wear in one place changes the load on all the others.
02 · COMPONENTS六个关键部件Six key components
以下以 D275-5 推土机底盘为例，点击可查看对应演示件号。Using the D275-5 dozer as an example — click through to the demo part numbers.
03 · WEAR磨损与成套更换Wear and set replacement
底盘件通常是一起磨损的。只换其中一件，新旧件尺寸不匹配，新件往往磨得更快。因此报价时我们会问清楚：是单件补换，还是整套更换。Undercarriage parts usually wear together. Replace only one and the mismatch between new and worn parts tends to wear the new one faster. That’s why we ask whether you need a single replacement or a full set.
具体是否需要更换，请以设备制造商的保养手册和现场测量为准。我们可以根据你提供的照片和测量数据，帮助整理成套询价清单。Whether to replace depends on the manufacturer’s service manual and on-site measurement. Send photos and measurements and we’ll help put together a set RFQ.
04 · PART NUMBERS如何找到并提交件号How to find and submit a part number
件号是最准确的找件依据。同一个名称“支重轮”，在不同机型、不同机号段上可能是完全不同的零件；把完整件号交给我们，就能一次说清要哪一件。本站不提供全量目录检索：任何件号都可以提交，我们在后台核对现货与货源后报价。The part number is the most precise way to identify a part. The same name — “track roller” — can mean entirely different parts across models and serial ranges. Send us the complete number and the ambiguity goes away. This site does not search a full catalog: every number is accepted, and we quote after checking stock and supply.
- 前段FIRST BLOCK
- 常与机型系列相关Often relates to the machine series
- 中段MIDDLE BLOCK
- 常表示部件组Often indicates the component group
- 后段LAST BLOCK
- 具体零件流水号Specific item number
这只是常见规律，各品牌编号规则不同，请始终以完整件号为准。This is a common pattern only; numbering differs by brand, so always use the complete number.
在哪里找件号Where to find it
- 设备铭牌：通常同时标有机型与机号，有时也有关键部件编号The machine nameplate: usually the model and serial, sometimes key component numbers
- 旧件上的铸字或钢印（清理油污后拍照最清楚）Cast or stamped markings on the old part (clean it and photograph)
- 设备随机的零件手册（Parts Book）按图号、组号对照The machine’s parts book, using the illustration and group numbers
- 旧件包装标签、过往采购单或维修记录Old packaging labels, past purchase orders, service records
常见输入错误Common input mistakes
- 字母 O 与数字 0、字母 I 与数字 1 混淆 —— 提交后我们会整理空格和横线再核对，但不会替你猜字母，请尽量抄全件号Letter O vs zero, letter I vs one — we tidy spaces and dashes when matching stock, but we will not guess letters, so copy the full number
- 只抄了一半件号，或漏掉末尾的后缀Copying only part of the number, or missing a suffix
- 旧件号已被新件号替代 —— 报价时我们会注明替代关系Superseded numbers — we note supersessions on the quotation
如何提交How to submit
- 在首页或询价单里输入、粘贴件号，一行一个，可在件号后写数量（如 17M-30-00340 2）Type or paste numbers on the home or RFQ page, one per line, with an optional quantity after the number (e.g. 17M-30-00340 2)
- 上传 Excel 或 CSV 需求单：我们提供模板，列名为「零件号 Part No.」「数量 Qty」「品质 Grade」「机型 Model」「备注 Notes」。品质列为可选项，可填纯正件 / OEM件 / 副厂件，或「都报」。上传后请确认列对应关系，重复件号会合并数量，品质取并集Upload an Excel or CSV list. A template is available with columns Part No., Qty, Grade, Model and Notes. Grade is optional — Genuine, OEM, Aftermarket, or “Quote all grades”. Confirm the column mapping after upload; duplicate numbers are merged by quantity, and grades are unioned
- 原文件会随询价单一并留下，方便我们对单The original file stays attached to the RFQ so we can check it against the lines
整份粘贴或直接上传 Excel，所有件号进入同一张询价单，我们一并报价。Paste the list or upload Excel. Every number goes onto the same RFQ and is quoted together.
提交件号05 · NO NUMBER没有件号时怎么办If you do not have a part number
可以先浏览常备件，按机型筛选 D275-5、PC200 等看看有没有对得上的现货件。这只是部分展示，找不到也没关系——在询价单里写下机型与机号，或上传铭牌、旧件、图纸的照片，我们按图帮你查件并报价。You can browse featured stock and filter by a model such as D275-5 or PC200 in case a stock item is a match. That showcase is only a selection, and it is fine if nothing lines up — put the model and serial on the RFQ, or upload a photo of the nameplate, old part or drawing, and we will identify and quote the part.
为什么还需要机号Why the serial number matters
同一机型在不同年份、不同机号段可能有设计变更，配件也随之不同。设备铭牌上通常同时标有机型和机号，询价时一并提供，能大幅减少来回确认。The same model can change design across years and serial ranges, and the parts change with it. The nameplate usually shows both model and serial — include both to avoid back-and-forth.
06 · GRADES三种品质The three grades
同一件号通常可以按三种品质报价。它们描述来源与制造关系，不是“好 / 坏”的标签。leston 不是任何设备品牌的授权经销商；纯正件同样按询价代采，不代表获得该品牌授权。The same part number can usually be quoted in three grades. The labels describe origin and manufacture — they are not a good/bad ranking. leston is not an authorized dealer of any equipment brand; genuine parts are still sourced on request, which does not imply authorization.
| 品质Grade | 指什么What it means | 常见取舍Typical trade-offs |
|---|---|---|
| 纯正件Genuine | 设备原厂（主机厂）出品的配件，带该品牌标识与包装。Parts issued by the machine manufacturer, with that brand’s marking and packing. | 通常最接近出厂规格与装配关系；价格与货期往往也最高、最长。质保随货源而定，以报价单为准。Typically closest to factory specification and fitment; price and lead time are usually the highest and longest. Warranty follows the source and is confirmed on the quotation. |
| OEM件OEM | 由原配套供应商制造的同一部件，通常不带主机厂品牌标识。The same component made by the original supplier, usually without the machine-brand mark. | 规格与原配套关系接近，价格和货期通常居于中间。具体以报价为准。Specification is typically close to the original supply; price and lead time usually sit in the middle. Confirmed on the quotation. |
| 副厂件Aftermarket | 其他制造商按互换规格生产的配件，不是主机厂或其原配套厂的产品。Interchangeable parts made by other manufacturers — not the machine brand or its original supplier. | 通常更经济、货源更灵活；品质与质保跨度也更大，适合在报价单上比较后决定。Usually more economical and more flexible in supply, with a wider spread in quality and warranty — compare options on the quotation. |
怎么选How to choose
- 安全件、精密配合件或希望尽量贴近原车状态时，优先考虑纯正件或 OEM件For safety-critical parts, close-tolerance items, or when you want to stay closest to the original machine, start with Genuine or OEM
- 易损件、消耗件或对成本敏感时，可以三种都报，比较价格、货期与质保后再定For consumables or cost-sensitive items, ask for all three grades and compare price, lead time and warranty
- 拿不准时，选「都报」——这是询价单的默认选项，也可在每一行单独修改If you are unsure, choose “Quote all grades” — that is the RFQ default, and you can still change it per line
- 翻新件是使用状态（旧件修复），不是第四种品质；如需翻新，请在备注里说明Remanufactured is a condition (a rebuilt used part), not a fourth grade; ask for reman in the notes if you need it
站内不公布价格。每种品质的货期与质保以对应报价单为准。Prices are not published on the site. Lead time and warranty for each grade are confirmed on the quotation.
07 · RFQ CHECKLIST询价时提供什么What to include in an RFQ
- 件号与数量（最重要）；有清单可直接上传 ExcelPart numbers and quantities (most important); a list can be uploaded as Excel
- 设备机型与机号Machine model and serial number
- 旧件照片：整体、铸字 / 钢印、关键尺寸Photos of the old part: overall, markings, key dimensions
- 希望报价的品质：纯正件、OEM件、副厂件，或都报；如需翻新件请在备注说明Which grades to quote: Genuine, OEM, Aftermarket, or all three; mention reman in the notes if you need it
- 收货国家 / 港口，以及期望的发运方式Destination country / port and preferred shipping method
- 联系邮箱（必填，我们用它回复报价）；电话与 WhatsApp / 微信为选填A contact email (required — we use it to send the quotation); phone and WhatsApp / WeChat are optional
我们会在 1–3 个工作日内回复报价，并尽快与您联系。We'll reply with a quote within 1–3 business days and get back to you as soon as we can.