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The 79995 left and 79996 right milling drum base holder functions as a structural mounting component installed on cold milling machines used in asphalt pavement removal and road rehabilitation projects. Manufactured by JST with 12 years of production experience in road construction wear parts, these holders position and secure cutter teeth bases on the milling drum assembly during operation. The parts distribute cutting loads across the drum structure while maintaining consistent tool alignment during pavement removal at depths between 0-330mm. These components serve equipment fleets, road maintenance contractors, and machinery repair facilities conducting highway resurfacing, airport runway renovation, and urban road reconstruction projects.
During milling operations, the base holder absorbs impact loads from rotating cutter teeth contacting asphalt and concrete surfaces. The left (79995) and right (79996) configurations mount on opposite sides of the milling drum to maintain rotational balance and ensure uniform cutting pattern across the working width. Properly functioning holders prevent tool holder deflection that causes uneven cutting, increased tooth wear, and additional vibration in the milling drum gearbox. Each holder includes precision-machined mounting surfaces that match original equipment mounting points.
These holders fit 1-meter and 2-meter class cold milling machines from major manufacturers including Wirtgen W1000/W1900/W2000 series, Caterpillar PM102/PM200, and Bomag BM1000/1300 models. Buyers should verify part numbers against their equipment parts manual, as left and right configurations are not interchangeable.
Each milling drum base holder is produced from 42CrMo alloy structural steel, a chromium-molybdenum grade commonly specified for high-load construction equipment components. The material provides a tensile strength of 1080 MPa and yield strength of 930 MPa after heat treatment, suitable for the repeated impact loads encountered during pavement milling operations. Material certifications are available for commercial orders upon request.
The holders undergo quenching and tempering heat treatment to achieve a core hardness of 28-32 HRC, with induction hardening on mounting surfaces to 44-48 HRC for wear resistance. All mounting holes are CNC machined to positional tolerance of ±0.05mm, and contact surfaces are surface ground to a flatness tolerance of 0.03mm to ensure proper seating against the drum. The parts receive manganese phosphate surface treatment to prevent corrosion during storage and shipping.
Production follows ISO 9001:2015 quality management system requirements. Each production batch undergoes hardness testing, dimensional inspection using coordinate measuring machines, and ultrasonic testing for material defects. Sample parts from each batch undergo load testing at 120% of rated working load to verify structural integrity.
Item | Details |
|---|---|
Part Number | 79995 (Left), 79996 (Right) |
Product Name | Milling Drum Base Holder |
Application | Road Construction Milling Machine |
Material | 42CrMo Alloy Steel |
Condition | New |
Function | Milling Drum Supporting & Fixing |
Quality Standard | OEM Dimensional Specification |
Surface Hardness | 44-48 HRC |
Core Hardness | 28-32 HRC |
Warranty | 6 Months |
Delivery Time | 7-15 working days |
Payment Terms | TT, LC, Western Union |
Shipment Port | Shanghai, China |
Before installation, inspect the milling drum mounting surface for wear or damage that may prevent proper seating. Clean all mounting holes and contact surfaces to remove asphalt residue, rust, or debris. Install mounting bolts with thread locking compound and torque to 280 Nm in a cross-pattern sequence to ensure even clamping force. After 8 hours of initial operation, re-torque all mounting bolts to specification. Left and right holders must be installed in their designated positions to maintain drum balance.
Inspect base holders during every cutter tooth replacement cycle, typically every 20-40 working hours depending on aggregate hardness in the pavement material. Replace holders when mounting surface wear exceeds 1.5mm, when cracks appear in the body, or when mounting holes show elongation exceeding 0.3mm. For commercial operations conducting large-scale milling projects, maintain an inventory of 2-4 holder sets to minimize equipment downtime.
During routine maintenance, apply anti-seize compound to bolt threads to facilitate future removal. Clean holder surfaces daily using a pressure washer to prevent asphalt buildup that can accelerate wear. Replace all mounting bolts when installing new holders, as used bolts may have experienced fatigue loading.
These holders interchange with OEM part numbers 79995 and 79996, as well as aftermarket equivalents from major construction equipment parts suppliers. The holders work in conjunction with HT11, HT22, and W6/20 series milling teeth and corresponding tooth holders.
For complete drum rebuilds, consider ordering base holders together with matching tooth holders, milling teeth, and mounting bolts as a complete kit. This ensures all components meet the same dimensional tolerances and reduces installation time. Related wear parts including drum scraper bars and side plates are also available.
Standard orders ship within 7-15 working days from the Shanghai warehouse. Orders for 50 units or more qualify for bulk pricing. Each unit is packaged in individual anti-corrosion bags and packed in plywood crates suitable for ocean freight. Express shipping options are available for urgent repair requirements.
The 6-month warranty covers manufacturing defects in material and workmanship under normal operating conditions. Warranty does not cover damage from improper installation, overloading, or operation outside equipment specifications. Claim processing requires photographic evidence of the defect and installation conditions.
For enterprise customers with specific requirements, custom production is available for modified holder designs or different material specifications. Minimum order quantity for custom production is 100 units, with lead time of 30-45 days. Technical drawings are provided for approval before production begins.
Service life ranges from 400-800 working hours depending on pavement aggregate hardness, milling depth, and operator technique. Milling concrete pavement typically results in shorter service life compared to asphalt milling.
Cross-reference the part number with your equipment parts manual, or provide your machine model and serial number to our technical support team for verification. Dimensional drawings are available to confirm fitment before purchase.
The standard minimum order quantity is 10 units for stock parts. Sample orders of 1-2 units are available for testing purposes, with sample pricing applied.
Yes, material test reports and dimensional inspection reports are provided for all bulk commercial orders. Third-party inspection by SGS or similar agencies can be arranged at additional cost.
