Overview
The ZF 0501.008.377 SYNCHRONIZER is a critical internal component engineered to facilitate smooth gear engagement within heavy-duty construction machinery transmissions. This OEM genuine part ensures that gear speeds are matched before meshing, reducing shift shock and preventing drivetrain damage. Positioned directly on the main shaft assembly, the synchronizer works in concert with the 2094101012: TRANSMISSION HOUSING to maintain precise alignment during operation. The SKU 0501.008.377 is specifically designed for ZF powershift transmissions used in loaders, graders, and excavators, guaranteeing factory-specified tolerances for long service life.
Symptoms of Failure
- Gear grinding or clashing during shifts — A worn synchronizer fails to equalize shaft speeds, causing audible metal-on-metal contact when engaging forward or reverse gears.
- Delayed or incomplete gear engagement — Operators may experience a hesitation before the gear locks in, often accompanied by a momentary loss of power delivery.
- Transmission popping out of gear — As the synchronizer hub or blocker ring wears, the gear can disengage under load, particularly in lower ratios used for heavy pushing.
- Increased shift effort or lever stiffness — Internal friction from degraded synchronizer surfaces requires excessive force to move the shift rail, sometimes leading to broken shift forks.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.008.377 |
| Type | Synchronizer Assembly (Cone & Hub) |
| Material | Case-hardened steel with brass friction ring |
| Outer Diameter | 145 mm (estimated) |
| Inner Diameter | 65 mm (estimated) |
| Weight | 1.2 kg (2.65 lbs) |
| OEM Reference | ZF 0501.008.377 |
| Compatible Housing | 2094301036: HOUSING |
| Seal Kit | 0750111371: SHAFT SEAL |
Compatibility
This synchronizer is engineered for ZF WG series powershift transmissions commonly deployed in construction machinery. Verified compatible models include WG180, WG200, and GF180 series. It is also used in certain ZF 4WG-200 and 6WG-250 variants. The part interfaces directly with the 2094298057: HOUSING and the 2094301071: COVER to form the complete shift mechanism. Always verify your transmission serial number against ZF documentation to ensure correct fitment.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094101012 | TRANSMISSION HOUSING | Encloses and supports gear train |
| 2094301036 | HOUSING | Intermediate housing for synchronizer assembly |
| 2094298057 | HOUSING | Rear housing providing bearing support |
| 2094301071 | COVER | Seals shift mechanism access port |
| 0750111371 | SHAFT SEAL | Prevents oil leakage at output shaft |
| 0634303085 | O-RING | Seals hydraulic passages |
| 2094301030 | GASKET | Provides leak-proof joint between housings |
| 0631306670 | CYLINDRICAL PIN | Aligns housing halves during assembly |
| 0636011356 | HEXAGON SCREW | Fastens cover to housing |
| 4475280060 | SCREW PLUG | Seals oil drain or test ports |
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