Overview
The ZF 0637.100.679 PUMP FLANGE (SKU: 0637.100.679) is a critical OEM genuine component that serves as the mounting interface between the hydraulic pump and the transmission housing in ZF’s WG series drivelines. Machined from high-strength cast iron, this flange ensures precise alignment of the pump drive gear with the torque converter housing, directly supporting oil flow for clutch actuation and lubrication. It bolts directly to the TRANSMISSION HOUSING and seals against the HOUSING assembly, making it a non-negotiable element for maintaining hydraulic circuit integrity in heavy-duty applications.
Symptoms of Failure
- Hydraulic oil seepage at pump mounting interface: A worn or cracked pump flange often causes visible oil leaks around the joint between the pump and transmission housing, leading to low fluid levels and erratic shifting.
- Intermittent gear slipping under load: When the flange distorts, pump alignment shifts, reducing hydraulic pressure and causing clutch packs to slip during acceleration or hill climbs.
- Unusual whining or cavitation noise from pump area: A misaligned flange allows air ingestion into the hydraulic circuit, producing a high-pitched whine that worsens as transmission temperature rises.
- Delayed engagement when shifting from Neutral to Drive: Reduced pump efficiency due to flange wear delays pressure buildup, resulting in a noticeable lag before the transmission engages.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | 0637.100.679 |
| Material | Ductile cast iron (EN-GJS-500-7) |
| Weight | 1.85 kg (4.08 lbs) |
| Bolt Hole Pattern | 6 x M10 on 120 mm PCD |
| Sealing Surface Diameter | 98 mm |
| OEM Reference | ZF 0637.100.679 |
| Max Operating Pressure | 25 bar (363 psi) |
Compatibility
This pump flange is engineered for ZF’s WG series powershift transmissions, specifically the WG100, WG130, and WG131 models. It also fits select variants of the WG180 and WG200 series when used with the corresponding TRANSMISSION HOUSING. Always verify the bolt pattern and pump drive spline count against your specific transmission serial number before installation. The flange works in conjunction with the TYPE PLATE to confirm model identification, and the SCREW PLUG seals the pressure test port located on the flange body.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 2093101025 | HOUSING | Encloses the pump drive gear and supports the flange |
| 2093301031 | TRANSMISSION HOUSING | Main structural case that the flange mounts to |
| 0730365092 | TYPE PLATE | Identification tag for transmission model verification |
| 4475280013 | SCREW PLUG | Seals the pressure test port on the flange |
| 2093301021 | GASKET | Provides leak-proof seal between flange and housing |
| 2093301033 | COVER | Protects the pump cavity from debris ingress |
| 0636015073 | HEXAGON SCREW | Fastens the flange to the transmission housing |
| 0634314235 | O-RING | Creates a static seal on the flange bore |
| 0501337897 | SPEED SENSOR | Monitors pump drive speed for electronic control |
| 0636101026 | CAP SCREW | Secures the speed sensor bracket to the flange |
Frequently Asked Questions
Q: Can I reuse the old gasket when installing this pump flange?
A: No. ZF recommends always replacing the GASKET (part 2093301021) during flange replacement to prevent oil leaks and ensure proper torque retention.
Q: Does this flange fit the WG180 transmission without modification?
A: It fits WG180 models that share the same pump mounting pattern as the WG130. Check your transmission’s TYPE PLATE to confirm compatibility before ordering.
Q: What torque specification should I use for the hexagon screws?
A: Tighten the HEXAGON SCREW fasteners to 45 Nm (33 ft-lbs) in a crosswise pattern, then apply a final pass at 55 Nm (41 ft-lbs).
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Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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