Overview
The ZF 0501.004.720 BRAKE is an OEM genuine friction component engineered for the internal braking system of heavy-duty ZF powershift transmissions. Positioned within the clutch pack assembly, this part modulates hydraulic pressure to provide controlled deceleration and holding torque in construction machinery. The SKU 0501.004.720 identifies a direct replacement brake disc that interfaces with the 2094104412 MAIN SHAFT and the 2094304054 MAIN SHAFT to ensure synchronized engagement during load cycles. Without this brake, the transmission cannot reliably lock or release the planetary gearset under high-torque conditions.
Symptoms of Failure
- Delayed engagement or “brake drag” – When the 0501.004.720 wears thin, the transmission fails to fully disengage, causing heat buildup and sluggish shifting in wheel loaders and dozers.
- Oil contamination with metallic particles – Friction material shedding from the brake disc leads to dark, gritty transmission fluid, often detected during routine filter inspections.
- Intermittent loss of holding power on inclines – Worn brakes allow the vehicle to creep forward or backward when parked on a grade, a critical safety issue in earthmoving equipment.
- High-frequency vibration during deceleration – Uneven wear on the brake surface creates chatter that transfers through the 2094106010 SHIFT SYSTEM and driveline.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0501.004.720 |
| Material | Sintered bronze friction lining on steel core |
| Outer Diameter | 180 mm |
| Inner Diameter | 120 mm |
| Thickness (New) | 4.5 mm |
| Weight | 0.85 kg |
| OEM Reference | ZF 0501.004.720 |
Compatibility
This brake disc is designed for ZF powershift transmissions commonly found in construction machinery, specifically the WG180 and WG200 series. It also fits select variants of the WG150 and WG250 transmissions used in articulated dump trucks and compact loaders. Always verify the stack height and spline count against your existing assembly. For complete rebuilds, pair this brake with the 2094206001 GEARSHIFT SHAFT to restore full shift precision.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2094104412 | MAIN SHAFT | Transfers torque from brake pack to output flange |
| 2094304054 | MAIN SHAFT | Secondary shaft for clutch pack alignment |
| 2094106010 | SHIFT SYSTEM | Hydraulic valve body that actuates brake engagement |
| 2094206001 | GEARSHIFT SHAFT | Mechanical link between shift fork and brake piston |
| 2094306053 | GEARSHIFT SHAFT | Alternate length shaft for WG200 transmissions |
| 0630513070 | SNAP RING | Secures brake disc stack on main shaft |
| 2094306019 | WASHER | Thrust washer for axial clearance adjustment |
| 0732040444 | COMPRESSION SPRING | Returns brake piston to neutral position |
| 0732040728 | COMPRESSION SPRING | Heavy-duty spring for high-torque applications |
| 2093206001 | BUSH | Guides gearshift shaft through transmission housing |
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