Overview
The ZF 4657.354.014 PUMP FLANGE is a precision-machined OEM genuine component engineered for the WG171, WG190, and WG191 transmission series. This critical interface component mounts directly to the TRANSMISSION HOUSING, providing a sealed connection point for the hydraulic pump assembly. The flange ensures proper alignment and oil flow between the pump and the transmission’s internal lubrication circuit. As a genuine ZF part, SKU 4657.354.014 guarantees exact fitment and long service life in heavy-duty industrial applications.
Symptoms of Failure
- Hydraulic oil seepage at pump mounting interface: A worn or warped pump flange often causes visible oil leaks around the pump-to-housing joint, leading to low fluid levels and eventual transmission overheating.
- Intermittent gear slipping under load: When the flange loses its sealing integrity, air ingress into the hydraulic system can cause pressure drops, resulting in erratic clutch engagement and gear slippage during operation.
- Abnormal pump whine or cavitation noise: A damaged flange can misalign the pump shaft, producing a high-pitched whining sound that worsens as transmission fluid temperature rises.
- Reduced hydraulic pressure at cold start: A compromised flange seal allows fluid to bypass the pump intake, causing delayed pressure buildup and sluggish transmission response in cold weather.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 4657.354.014 |
| Material | High-strength cast aluminum alloy |
| Overall Diameter | 165 mm (6.50 in) |
| Flange Thickness | 22 mm (0.87 in) |
| Mounting Bolt Pattern | 6-hole, 130 mm BCD |
| Weight | 0.85 kg (1.87 lbs) |
| OEM Reference | ZF 4657.354.014 |
| Sealing Surface | Ground flat to 0.05 mm tolerance |
Compatibility
This pump flange is designed for ZF WG-series powershift transmissions commonly found in construction and agricultural machinery. It is directly compatible with the following ZF models: WG171, WG190, WG191, WG180, WG200, and WG210 series. The flange also fits the BP 210 and WG 211 series when used with the appropriate HOUS.FRONT SECT adapter. For proper installation, always replace the O-RING (part 0634313514) and inspect the SCREEN SHEET (4656201015) for debris. The flange mounts using CAP SCREW fasteners (0636100803) and aligns with a CYLINDRICAL PIN (0631306816).
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4656101030 | TRANSMISSION HOUSING | Main structural casing for gear and shaft assembly |
| 4656301066 | HOUS.FRONT SECT | Front section housing for pump and clutch pack |
| 4656201015 | SCREEN SHEET | Fine mesh filter protecting hydraulic circuits |
| 4656301037 | TUBE | Fluid transfer conduit between pump and valve body |
| 0634313514 | O-RING | Seal preventing oil leakage at flange joint |
| 0636100803 | CAP SCREW | Fastener for securing flange to housing |
| 4656301064 | HOUSING REAR PART | Rear casing section supporting output shaft |
| 0631306816 | CYLINDRICAL PIN | Alignment dowel for precise component positioning |
| 0636100801 | CAP SCREW | Mounting bolt for front housing section |
| 0636100160 | CAP SCREW | Fastener for rear housing attachment |
Frequently Asked Questions
Q: Can the 4657.354.014 pump flange be reused after removal?
A: ZF recommends replacing the flange whenever the pump is serviced, as the sealing surface can become distorted from torque stress. Always install a new O-RING (0634313514) during reassembly to prevent future leaks.
Q: What torque specification should be used for the mounting cap screws?
A: Use 45 Nm (33 ft-lbs) for the CAP SCREW fasteners (0636100803) in a cross-tightening pattern. Over-torquing can warp the flange and cause oil bypass.
Q: Is this flange compatible with the WG210 series transmission?
A: Yes, the 4657.354.014 fits WG210 and WG211 models when used with the correct HOUS.FRONT SECT (4656301066). Verify your transmission serial number before ordering.
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