SCM415/SAE 8620 Alloy Steel Synchronizer Hub with HRC 58-62 Hardness and 54T/46T Gear Configuration for Hino 300 Series
| Surface Hardness: | HRC 58–62 (core Retains Toughness) | Manufacturing Process: | CNC Turning/milling, Internal Spline Broaching, Precision Grinding |
| Heat Treatment: | Carburizing + Quenching + Tempering | Gear Configuration: | 54T/46T |
| Matching Component: | 33364-36080 (SLEEVE, TRANSMISSION HUB, NO.2) | Material: | SCM415 / SAE 8620 Alloy Steel (or Equivalent) |
| OEM Part Number: | 33361-36030 | Transmission Type: | 5-speed Manual (MTM) |
| High Light: | SCM415 alloy steel synchronizer hub,SAE 8620 synchronizer hub Hino 300,54T gear synchronizer hub HRC 58-62 |
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The synchronizer hub (OEM: 33361-36030) is a critical internal component of the 5-speed manual transmission (MTM) used in Hino and Toyota commercial vehicles. This hub serves as the central locking and torque-transfer element within the synchronizer assembly, enabling smooth gear engagement by matching speeds between the hub and gear before locking them together.
| Part Number | 33361-36030 |
| Product Name | Synchronizer Hub |
| Car Model | Toyota |
| Engine Model | Toyota WU340 14B |
| Condition | 100% Brand New |
| Material | SCM415/SAE 8620 alloy steel |
| Surface Hardness | HRC 58-62 |
| Gear Configuration | 54T/46T |
| Origin | China Mainland |
This synchronizer hub is designed as a direct OEM replacement for:
| Model | Transmission | Engine / Notes |
|---|---|---|
| Hino 300 Series (OLD) | 12LT HT125 | WU340 14B |
| Hino Dutro | WU300, WU340, WU410 series | Various diesel engines |
| Chassis | Engine | Transmission |
|---|---|---|
| BU66, BU60, BU61, BU67, BU68 | 5F (diesel) | 5-speed manual (MTM) |
| BU7#, BU8#, BU9# | 5F (diesel) | 5-speed manual (MTM) |
Additional compatible platforms: Toyota Coaster, Toyota Quick Delivery, Toyota Dyna 200 / ToyoAce G25
The synchronizer hub withstands full engine torque and shock loads during gear changes. Common failure symptoms include:
| Symptom | Diagnosis |
|---|---|
| Difficulty engaging first or second gear | Worn hub teeth - immediate inspection required |
| Grinding noise when shifting | Worn hub or synchronizer ring - replace hub and inspect sleeve |
| Transmission pops out of gear under load | Worn hub teeth or shift fork - replace hub |
| Excessive play in gear lever | Worn internal splines on the hub |
| Metallic particles in transmission oil | Worn hub teeth or bearings - requires disassembly and inspection |
Specifically designed for 5-speed manual transmissions with 54T/46T gear configuration matching factory specifications.
Manufactured from SCM415/SAE 8620 alloy steel for optimal surface hardenability and core toughness.
Carburizing and quenching process delivers HRC 58-62 surface hardness with impact-resistant core.
Produced using CNC turning, milling, internal spline broaching, and precision grinding for accurate fitment.
Designed to work with 33364-36080 shift sleeve as a matched pair for optimal performance.
Prevents secondary damage to shift sleeve and gear teeth, avoiding costly transmission rebuilds.
Each batch undergoes comprehensive verification including:
- Material composition analysis (SCM415/SAE 8620 grade confirmation)
- Surface hardness testing (HRC 58-62 verification)
- Tooth profile accuracy measurement via CMM
- Internal spline dimension verification
- Concentricity and runout measurement
- Surface finish analysis
- Heat treatment microstructure examination
Certificate of conformance with batch test data available for wholesale orders.
Critical Installation Notes:
- This is the No. 1 clutch hub (first/second gear synchronizer hub)
- Designed to work with 33364-36080 shift sleeve - replacing both components together is recommended
- Inspect synchronizer rings, shift fork, and gear engagement teeth for wear
- Replace transmission oil with correct grade (GL-4 or GL-5) after reassembly
- Check and adjust shift linkage after installation
- Refer to Toyota or Hino workshop manual for complete procedures
- Packaging: Sealed in anti-rust packaging, foam-lined carton
- Lead Time: 3-7 working days (stock orders); 15-25 days (production orders)
- Minimum Order: 1 piece
- Shipping: FedEx, UPS, DHL for samples; sea freight for bulk orders
- H/S Code: 8708.40
Matching components (shift sleeve 33364-36080, synchronizer rings, bearings) also available for complete transmission rebuilds.
The synchronizer hub 33361-36030 is an OEM-spec replacement for the No. 1 clutch hub in 5-speed manual transmissions of Hino 300 Series and Toyota Dyna vehicles. Features 54T/46T gear configuration, SCM415/SAE 8620 alloy steel construction with carburizing heat treatment (HRC 58-62), and designed to work with 33364-36080 shift sleeve.
Before ordering: Confirm your vehicle's chassis code and transmission type (5-speed manual).
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