The 8970347703 brake drum is a direct-fit rear brake drum for the Isuzu NPR66 truck with the 4HF1 engine. It matches original equipment specifications and provides consistent stopping power for commercial fleet operations. As a heavy duty truck brake drum, this rear axle component handles the friction surface that slows the vehicle during braking.
Features of the 8970347703 Brake Drum
The 8970347703 brake drum addresses several practical requirements for fleet operators and maintenance workshops:
- OE-Matched Specifications Matches original Isuzu part numbers including 8-97034-770-3, 8982489000, and 8-98248900-0. This ensures proper fitment on the NPR66 rear axle without modification.
- HT250 Grey Cast Iron Uses grade HT250 grey cast iron for stable friction performance and heat resistance. The material provides good vibration damping and consistent wear characteristics over its service life.
- Precision Machined Dimensions Inner diameter of 320 mm and outer diameter of 370 mm machined to tight tolerances. The 5-hole bolt pattern with 165 mm centering diameter matches the Isuzu NPR66 hub.
- 3-Year Warranty Comes with a 3-year warranty for reliability coverage. Each drum passes hardness testing and dimensional inspection during production.
- Customizable Finish Comes in standard black, with custom colors including red, green, yellow, blue, and purple for fleet identification.
Technical Specifications
| Parameter | Specification |
|---|---|
| OE Number | 8970347703 / 8-97034-770-3 / 8982489000 / 8-98248900-0 |
| Part Name | Rear Brake Drum |
| Vehicle Application | Isuzu NPR66 |
| Engine Model | 4HF1 |
| Position | Rear Axle |
| Material | HT250 Grey Cast Iron |
| Inner Diameter | 320 mm |
| Outer Diameter | 370 mm |
| Width | 90.5 mm |
| Centering Diameter | 165 mm |
| Bolt Holes | 5 |
| Weight | 18.9 kg |
| Warranty | 3 Years |
| MOQ | 30 Pieces (Sample Available) |
| Packaging | Pallet / Wooden Carton |
| Trade Terms | FOB, CIF, EXW |
Vehicle Applications and Compatibility
The 8970347703 brake drum fits the Isuzu NPR66 series equipped with the 4HF1 engine. This medium-duty truck platform handles urban delivery, regional logistics, and municipal service work. The Isuzu NPR66 rear brake drum operates under significant thermal stress during repeated stop-and-go routes, so component quality directly affects fleet safety.
Cross-reference part numbers include 8-97034-770-3, 8982489000, and 8-98248900-0. The Isuzu 4HF1 brake drum replaces the original part without modification. Always verify the OE number and dimensional parameters against your vehicle specification before ordering. [internal link: Isuzu brake drum collection]
Material and Manufacturing Quality
HT250 grey cast iron is the standard material for commercial vehicle brake drums. It maintains a stable friction coefficient across a wide temperature range and resists thermal fatigue under repeated braking cycles. The graphite structure in grey cast iron provides natural vibration damping, which helps reduce brake noise during operation.
Each 8970347703 brake drum passes spectrum analysis, hardness testing, and visual flaw detection during manufacturing. Production follows ISO/TS16949 quality management standards to maintain batch-to-batch consistency. HT250 cast iron maintains a hardness range of 180 to 220 BHN, balancing wear resistance with anti-cracking performance. [external link: ISO/TS16949 standard overview]
Frequently Asked Questions
What vehicles use the 8970347703 brake drum?
The 8970347703 brake drum fits the Isuzu NPR66 truck with the 4HF1 engine. It is a rear axle component for medium-duty commercial transport. Always confirm the OE number matches your vehicle specification before purchasing.
What material is the 8970347703 brake drum made of?
The drum uses HT250 grade grey cast iron. This material offers stable friction performance, good heat conductivity, and solid wear resistance. Grey cast iron remains the industry standard for commercial vehicle brake drums because it balances performance with cost.
What parameters confirm brake drum compatibility?
Check the OE part number, inner friction diameter, bolt hole pattern, pilot diameter, and overall drum depth. For the 8970347703, these specs are 320 mm inner diameter, 5-hole bolt pattern, 165 mm centering diameter, and 90.5 mm width. Cross-reference all parameters with your original part before installation.
Can I machine the 8970347703 brake drum if it develops scoring?
You can machine the drum only if the remaining internal diameter does not exceed the stamped discard limit. Most drums take safe machining 1 to 2 times. However, if heat checks, cracks, or hot spots are present, machining cannot eliminate the fracture risk and you must replace the drum.
Should brake drums be replaced in pairs on the same axle?
Yes. Always replace left and right drums together on one axle. Installing only one new drum creates uneven braking force between the wheels. This imbalance can cause the vehicle to pull during braking.
Contact Xingtai Yiwo for Your Brake Drum Requirements
Xingtai Yiwo Auto Parts Co., Ltd. has over 15 years of experience in brake drum manufacturing. Our facility in the Longyao County Parts Industrial Zone uses precision processing equipment and advanced testing instruments. With an annual output of 10,000 tons, we supply brake drums to fleet operators and distributors worldwide.
We offer flexible trade terms including FOB, CIF, and EXW. Sample orders are welcome for quality evaluation before bulk purchase. Contact our sales team for pricing on the 8970347703 brake drum and customized packaging options.
