Komatsu PC20 Top Roller Mini Excavator Undercarriage Parts Wholesale

Komatsu PC20 Top Roller (Carrier Roller) | Mini Excavator Undercarriage Parts

PC20 TOP Roller for Mini Excavator

The PC20 Komatsu mini excavator top roller is a core load-bearing component mounted on the upper frame of the mini excavator undercarriage. It firmly supports the track chain rail and keeps the track under stable tension during travel and operation. It prevents track sagging, jumping or derailment caused by excessive suspension distance.

This top roller effectively shares impact force when the machine travels on uneven ground, ensures smooth track movement and reduces extra wear between the track and adjacent undercarriage parts. It fits many working scenarios: narrow municipal construction sites, farmland renovation, indoor demolition, orchard maintenance, mountain trail repair, small earthwork backfilling. Widely used in Southeast Asia, it performs reliably in harsh environments including muddy roads, gravel yards and frozen roads.

With a high-strength alloy steel body and optimized floating oil seal structure, this PC20 top roller resists mud, dust and sediment ingress. It extends the service life of the undercarriage system, reduces maintenance frequency and unexpected downtime, lowers your overall accessory cost and keeps your mini excavator stable under long-time heavy operation.

Features

Specifications

Production Process & QC Control

FAJX has grown into a globally recognized brand, supplying mini excavator undercarriage parts for many excavator OEM manufacturers. We appreciate the trust and support from every customer. Our success comes from strict quality control of every product. From raw material incoming inspection, production processing to final QC inspection, we continuously pursue consistent high quality. We continuously retire outdated production equipment and introduce advanced CNC machinery. Below are our quality control highlights:

1. Strict sampling inspection is carried out for incoming raw materials. Qualified alloy steel such as 40Cr and 40Mn2 is adopted. Unqualified raw materials are rejected before production to guarantee the strength and wear resistance of undercarriage parts from the source.

2. CNC machining and vacuum heat treatment are adopted throughout production with segmented process control. We keep upgrading production equipment to stabilize dimensional accuracy and metallographic structure, ensuring consistent product performance.

3. Two rounds of QC tests are performed on semi-finished and finished products, including visual check, dimension measurement and magnetic particle inspection. Non-conforming products are isolated for rework. Only qualified products can be packed and delivered.

Packaging and Shipping

FAJX Factory Advantages

FAJX PARTS is a supplier of mini excavator undercarriage parts with our own FAJX brand. Our products are exported to 57 countries and regions worldwide. Equipped with advanced production lines, we manage our factory in strict accordance with ISO standards and 6S management rules, supplying high-quality Made-in-China parts for global customers. Whether you are OEM buyer, wholesaler, agent, custom order client, retailer, excavator OEM manufacturer or repair shop, we can deliver services you need. Here are the reasons to choose FAJX:

I. We are equipped with complete CNC machining, vacuum heat treatment and flaw detection equipment to achieve high-precision processing of undercarriage parts and guarantee stable product consistency.

II. We hold ISO, CE, SGS, CNAS and other relevant certifications. Our products comply with market access standards of many countries and full test reports can be provided.

III. We implement ISO quality management system together with 6S on-site management. Full-process control from raw material warehousing to finished goods delivery keeps the defect rate low.

IV. We support multiple cooperation models including retail, wholesale, agency and OEM supply. Both small and bulk orders can get fast response.

V. Customization based on drawings or samples is available. We can adjust material, dimension and structure to develop exclusive undercarriage parts for different working conditions and machine models.

Customization Service

FAJX PARTS. With 18 years of global communication with customers, we found that mass-produced standard products may not meet the demands of users in different regions. The working environment, conditions, operation and maintenance of PC20 mini top roller vary from country to country. Factors such as weather and modifications to PC20 mini excavators also make a difference. We have 10 years of experience in custom mini excavator undercarriage parts. Please share your requirements with FAJX, and we will quickly adjust the solution for you.

1. We can select different alloy steel materials (40Cr / 40Mn2, etc.) and adjust heat treatment processes to suit heavy-duty or light-duty working conditions.

2. Customize key dimensions of PC20 top roller including outer diameter, shaft diameter and mounting hole spacing to match excavator retrofits and equipment modifications.

3. Customers may provide samples or engineering drawings. We carry out reverse engineering or new mold production according to your drawings.

4. Optimize sealing structure and surface protection for special climates such as high temperature, high humidity, salt-alkali and severe cold to improve corrosion and aging resistance of top rollers.

PC20 Top Roller Maintenance and Cleaning Guide

To ensure the PC20 mini excavator maintains optimal working conditions during operation, FAJX PARTS reminds users to conduct regular inspections and standard maintenance of the mini top roller in between busy construction work, following the five requirements below:

I. Establish a fixed inspection interval: check the top rollers at least every 250 operating hours or once a month. Under harsh conditions such as mud, gravel or heavy dust, shorten the interval to every 100–150 hours and keep an inspection log.

II. Inspect for oil traces or leaks around the top roller body and check whether the floating oil seal has failed. Listen for abnormal noises during travel, and verify that rollers rotate freely without binding, uneven wear or stiffness; replace immediately if any abnormality is found.

III. After each operation, promptly remove mud, stones and debris lodged between the rollers, tracks and guides to prevent abrasive material from entering the seals and causing premature wear or seal damage.

IV. When replacing a top roller, follow the factory service manual: tighten bolts to the specified torque, use qualified washers and locking hardware, and ensure clean, properly aligned mounting surfaces. After installation, run the machine at low speed under no load for a short distance, then recheck bolt tightness.

V. PC20 top roller wear is often linked to incorrect track tension, so measure track sag and adjust to specification at the same time. Also inspect track links, pins, sprockets and idlers for wear, and replace worn components as a set to ensure even load distribution and longer service life.

How to Install Mini PC20 Top Roller

To assist every customer who selects FAJX Mini Excavator Undercarriage Parts, we have compiled an installation guide for PC20 Top Roller:

1. Verify the top roller model and dimensions before installation. Check for cracks or porosity on the surface. Inspect the wear condition of tension cylinder and guide rail, and clean debris on the base to prevent assembly interference.

2. Align the mounting holes and place the top roller steadily. Tighten bolts to specified torque. Adjust track tension after assembly; avoid excessive or insufficient tension to ensure smooth rotation of the PC20 Top Roller.

3. Complete a no-load test run after installation. Confirm the top roller rotates freely without stuck. Record initial running status for future maintenance reference.

4. Carry out periodic inspection during operation. Watch out for abnormal noise or wobble of the Mini Top Roller. Stop the machine immediately once abnormalities are found to prevent further damage to tracks and other mini excavator undercarriage parts.

Chinese Brand, Global Quality

We sincerely appreciate every customer who chooses FAJX excavator undercarriage parts. To supply high-quality PC20 Top Roller for global partners, all our Mini Excavator Undercarriage Parts are manufactured in strict accordance with CE, SGS, CNAS and COC certification. We hereby solemnly promise:

Product Quality Promise: We strictly control raw materials and heat treatment processes. All undercarriage parts meet dimensional tolerance requirements with excellent wear resistance to ensure stable equipment operation.

Compliance & Certification Promise: Products are manufactured per CE, SGS, CNAS, COC specifications. Relevant test reports are available to meet market access requirements worldwide.

Customization & Delivery Promise: We support model verification and product selection upon request. Orders will be delivered on time to shorten your project lead time.

FAQ

Q: What is the part number of this Komatsu PC20 top roller?

A: The main reference part number is 9237948, and it also matches other common OEM codes including 20N-30-71200 and 21U-30-31201.

Q: Which excavator models does this PC20 top roller fit?

A: It is specially designed for Komatsu PC20 series mini excavators, and also compatible with John Deere JD35D and other small construction machinery that matches the same installation size.

Q: What material is used for this top roller body?

A: The roller body is made of high-quality 50MnB or 40Mn2 alloy steel, which ensures high structural strength and deformation resistance under heavy loads.

Q: What is the minimum order quantity for wholesale?

A: Conventional stock products support small batch trial orders, and the specific MOQ can be confirmed through further communication according to your actual demand.

Q: What is the usual delivery period for wholesale orders?

A: For conventional stock specifications, we can arrange delivery within 3 working days after confirming the order; for bulk customized orders, the delivery period can be negotiated separately.

WhatsApp:+8613655915508

WeChat:+8613799896866

Website:https://www.excavatortrackparts.com