Basic Info.
| Parts no. | 4N3181 | Material | Iron |
| Type | Starter Motor | Voltage | 24V |
| Compatibility | Caterpillar machines | Transport Package | Wooden Box |
| Trademark | DIRON | Origin | Luoyang City |
| HS Code | 8484314999 | Production Capacity | 5000PCS/Year |
Product Details
- Item Model：3T8950
- Date First Listed：2026/01/13
- Manufacturer：Diron Parts
Product Description
- Parts Number：4N3181
- Part Type：Starter Motor
- Compatible Equipment：Compatible with specific Caterpillar machines
The 4N-3181 is a high-torque aftermarket 24-volt electric starter motor engineered for Caterpillar® 3306 and 3406 series diesel engines. This heavy-duty unit delivers powerful cranking performance, fast engine starting, and reliable operation even in cold conditions or after long shutdown periods, making it ideal for construction, mining, marine, and industrial applications.
Key Features & Benefits
- Powerful 24 VDC motor with high-torque output for rapid starts in demanding environments
- Heavy-duty solenoid with copper contacts for consistent engagement
- Robust drive assembly with 11-tooth pinion for secure ring gear contact
- Sealed nose housing for excellent dust and water resistance
- Clockwise rotation (as viewed from drive end)
- Direct bolt-on mounting with SAE 3 flange – no modifications required
- 100 % bench-tested for cranking speed, current draw, and solenoid function
Common Applications (Caterpillar® Compatibility)
- Engines: – 3306 (PC & DI) – 3406 (early mechanical)
- Typical Machines: – Track-Type Tractors: D7G, D8K, D8L – Wheel Loaders: 966C, 966D, 966E, 980C – Excavators: 225, 235 – Off-Highway Trucks: 627B, 637D – Generator sets and marine propulsion units
Technical Specifications
- Part Number Reference: 4N-3181
- Voltage: 24 VDC
- Power Output: 7.5 kW (10 HP)
- Rotation: Clockwise
- Number of Teeth: 11
- Pinion Pitch: 8/10 DP
- Mounting: SAE 3 (3-bolt flange)
- Weight: ≈ 19 kg (42 lb)
Important Note:
- We only provide replacement products intended for aftermarket use in the Caterpillar machinery listed above. The brand name Caterpillar is used solely as reference information to indicate compatibility and does not imply that our products are OEM.
- Note: While this description provides general information, specific details such as size, weight and exact material may vary by manufacturer and specific application. To obtain the most accurate and up-to-date information, it is recommended to consult a qualified parts supplier such as DIRON PARTS.
FAQ
Q1. What is your terms of packing?
A: Generally, we pack our goods in neutral white boxes and brown cartons. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.
Q2. What is your terms of payment?
A: T/T 30% as deposit, and 70% before delivery. We’ll show you the photos of the products and packages before you pay the balance.
Q3. What is your terms of delivery?
A: FOB
Q4. How about your delivery time?
A: Generally, it will take 20 to 30 days after receiving your advance payment. The specific delivery time depends on the items and the quantity of your order.
Q5. Can you produce according to the samples?
A: Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.
Q6. What is your sample policy?
A: We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.
Q7. Do you test all your goods before delivery?
A: Yes, we have 100% test before delivery
Q8: How do you make our business long-term and good relationship?
A:1. We keep good quality and competitive price to ensure our customers benefit ;
2. We respect every customer as our friend and we sincerely do business and make friends with them, no matter where they come from
ABOUT DIRON
- Factory OF DIRON
Diron Parts Group Have Its Own Factory Ensure That We Offer Better Price For Customers. Besides, Diron Corporate With Some Reliable Principal Manufacturers, So Diron Also Supply Customer Other Quality Spare Parts.
- Team OF DIRON
With 18 years of manufacturing and exporting experience, Diron has a team of knowledgeable engineers, inspectors and technical workers, sales staff, after-sales personnel.
- Products OF DIRON
As a distributor, we supply parts covers for :Complete engines, Long block, Short block, Engine spare parts, Electricla products, Hydraulic products, Transmission products, Undercarridge products.Among them, Cylinder head, Cylinder block, Spacer-plate, Bushing & Pin are our best-selling products.
