ZF 0737.502.188 SLOTTED NUT | OEM Genuine Part

Overview

The ZF 0737.502.188 SLOTTED NUT is a precision-engineered OEM genuine component designed to secure critical rotating assemblies within heavy-duty ZF transmissions. This slotted nut functions as a positive locking mechanism on shafts, preventing axial displacement of gears, bearings, and clutches under extreme torque loads. Specifically, it is installed on the output shaft or countershaft of the transmission, where it must withstand high vibration and thermal cycling. The part number 0737.502.188 is laser-etched for traceability and is a direct replacement for factory-installed hardware. When paired with a 2094301036: HOUSING or a 2094298057: HOUSING, this nut ensures the entire shaft assembly remains rigidly aligned, reducing wear on adjacent components.

Symptoms of Failure

When the ZF 0737.502.188 slotted nut loosens or fatigues, three distinct failure modes emerge. First, transmission oil leaks from the shaft seal area occur because the nut no longer properly seats the bearing against the housing, allowing lubricant to bypass the 0750111371: SHAFT SEAL. Second, gear slipping under load becomes noticeable, especially during uphill operation or sudden acceleration, as the nut’s loss of clamping force allows the gear cluster to shift axially. Third, unusual metallic grinding noises from the transmission bell housing indicate that the nut has backed off, permitting the shaft to wobble and contact the 2094101012: TRANSMISSION HOUSING. Ignoring these symptoms can lead to catastrophic gear train damage and costly downtime.

Technical Specifications

Compatibility

This slotted nut is a standard fastening element across multiple ZF heavy-duty transmission families. It is commonly found in the WG180, WG200, and WG250 series used in construction machinery such as wheel loaders, graders, and dump trucks. Additionally, it fits the Ecomat 4HP and 6HP series where a castellated nut is required on the output shaft. Always verify thread pitch and slot width against your existing nut. For complete assembly, this nut works in conjunction with a 2094301071: COVER to seal the shaft end, and with the 0634303085: O-RING to prevent ingress of debris.

Related Components

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“text”: “The recommended installation torque is 120 Nm followed by an additional 90-degree turn to align the slot with the cotter pin hole. Always use a new cotter pin and never reuse the nut after removal.”
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“name”: “Can the 0737.502.188 nut be used on WG200 transmissions?”,
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“text”: “Yes, this slotted nut is compatible with WG180, WG200, and WG250 series transmissions. It is also used on Ecomat 4HP and 6HP models where a M30x1.5 castellated nut is specified.”
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“text”: “Key indicators include oil leaking from the shaft seal area, gear slipping under load, and metallic grinding noises from the transmission housing. These symptoms suggest the nut has loosened, allowing axial shaft movement.”
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