Overview
The ZF 0501.323.470 TORX SCREW is a critical OEM genuine fastener engineered for the valve body and housing assemblies within ZF WG100, WG130, and WG131 transmissions. This high-tensile screw secures the 4699101136 HOUSING and the 4699301218 HOUSING to the main transmission casing, ensuring precise clamping force for hydraulic circuit integrity. The SKU 0501.323.470 is designed to withstand extreme torsional loads and thermal cycling without deformation. When paired with the 0636101411 CAP SCREW, it provides redundant fastening for the 4699309114 HOUSING COVER, maintaining oil-tight sealing under high-pressure operation.
Symptoms of Failure
- Transmission fluid seepage around the valve body: A loose or fatigued 0501.323.470 screw allows the housing cover to shift, breaking the seal and causing slow oil drips.
- Intermittent gear hunting or delayed shifts: When this TORX screw loses torque, the housing alignment drifts, disrupting oil flow to clutch packs and causing erratic shift timing.
- Metallic rattling from the transmission pan: A broken or stripped screw can fall into the sump, creating debris that damages planetary gears and bearings.
- Persistent low line pressure codes (P0841, P0846): A loose fastener on the housing cover allows internal leakage, reducing hydraulic pressure and triggering diagnostic trouble codes.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | 0501.323.470 |
| Type | TORX Drive Screw (External TORX) |
| Thread Size | M8 x 1.25 |
| Length | 25 mm |
| Head Diameter | 14 mm |
| Material | 10.9 Grade Alloy Steel, Zinc-Nickel Plated |
| Weight | 12 g (0.42 oz) |
| OEM Reference | ZF 0501.323.470 |
| Torque Spec | 35 Nm ± 3 Nm |
Compatibility
This TORX screw is factory-specified for the ZF WG100, WG130, and WG131 series transmissions used in medium-duty trucks and construction equipment. It also fits the WG180 and WG200 models when used in the valve body or housing cover fastening positions. Always verify thread pitch and length against your existing hardware before installation. The 0501.323.470 is not interchangeable with standard hex bolts due to its unique TORX recess and precise shank length.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4699101136 | HOUSING | Main transmission housing for WG series |
| 4699301218 | HOUSING | Intermediate housing for valve body assembly |
| 4699309114 | HOUSING COVER | Seals the valve body chamber |
| 0636101411 | CAP SCREW | Secondary fastener for housing cover |
| 0631302072 | CYLINDRICAL PIN | Alignment pin for housing positioning |
| 0636302013 | SCREW PLUG | Seals oil passages in the housing |
| 0501331653 | SCREW PLUG | Drain plug for the transmission pan |
| 0634801038 | SEALING RING | Copper washer for plug sealing |
| 0637885613 | BREATHER | Pressure equalization valve |
| 0769100082 | TYPE PLATE | Identification plate for transmission model |
