Overview
This OEM genuine ZF 4651.056.026 component is a critical sealing and alignment element specifically engineered for the WG 110 series transmission. Positioned within the hydraulic control assembly, this part ensures precise fluid routing and pressure integrity during gear shifts. The SKU 4651.056.026 interfaces directly with the main valve body and the TRANSMISSION HOUSING to prevent cross-contamination between lubrication circuits. As a factory-spec replacement, it restores the transmission’s ability to maintain consistent clutch pack engagement under heavy industrial loads.
Symptoms of Failure
- Erratic shift timing under load: When the 4651.056.026 wears, hydraulic pressure fluctuates, causing delayed or harsh upshifts in WG110-equipped machinery.
- External fluid seepage near the valve body: Degraded sealing surfaces lead to visible oil leaks around the HOUSING interface, often mistaken for gasket failure.
- Intermittent neutral engagement: Worn alignment tolerances allow the transmission to momentarily lose drive pressure, especially during low-speed maneuvering.
- Increased operating temperature: Internal fluid bypass caused by a failing 4651.056.026 forces the torque converter to work harder, raising sump temperatures by 15-20°F.
Technical Specifications
| Parameter | Value |
|---|---|
| OEM Part Number | 4651.056.026 |
| Material | Hardened alloy steel with nitrile sealing lip |
| Outer Diameter | 56 mm |
| Inner Diameter | 26 mm |
| Height | 14 mm |
| Weight | 0.08 kg |
| OEM Reference | ZF WG110 Series |
Compatibility
This genuine ZF 4651.056.026 is primarily designed for the WG 110 series, but it also fits select variants of the WG180 and WG200 transmissions when used in conjunction with the correct O-RING kit. It is not backward-compatible with pre-2005 WG series models without also replacing the HOUSING assembly. For mixed-fleet applications, verify the valve body casting number against the WG110 parts catalog to ensure proper sealing geometry.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 4651101013 | TRANSMISSION HOUSING | Main structural casing for gear train |
| 4651301032 | HOUSING | Valve body cover plate |
| 0634303928 | O-RING | Hydraulic seal between housings |
| 4651301033 | HOUSING | Rear bearing retainer housing |
| 4651203002 | SCREEN SHEET | Fine mesh filter for oil pickup |
| 4651303005 | SCREEN SHEET | Secondary filter for valve body |
| 0636101032 | CAP SCREW | Fastener for housing assembly |
| 0630361028 | SEALING CAP | Port plug for test points |
| 4475280060 | SCREW PLUG | Drain/fill port closure |
| 0634303312 | O-RING | Seal for screw plug interface |
Frequently Asked Questions
Q: Can I install the 4651.056.026 without replacing the O-ring?
A: ZF recommends always replacing the O-RING (0634303928) simultaneously, as reused seals often cause immediate low-pressure faults in WG110 units.
Q: Does this part fit the WG180 with a modified housing?
A: Yes, but only if the HOUSING (4651301033) is also swapped to the WG110-spec version to maintain correct bore depth.
Q: How do I verify I have the correct 4651.056.026 revision?
A: Check the stamped code on the part face; genuine OEM units have a laser-etched “ZF” logo and a six-digit date code matching the WG110 production run.
📞 Need this part? Contact our ZF specialists:
Email: info@partszf.com |
Phone: +86 158 2286 3467 |
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