ZF 0737.502.171 SLOTTED NUT | OEM Genuine Part

Overview

The ZF 0737.502.171 SLOTTED NUT is a precision-engineered locking component designed to secure critical shaft assemblies within ZF heavy-duty transmissions. This OEM genuine part functions as a positive-locking fastener, preventing axial displacement of gears and bearings under high-torque loads commonly found in construction machinery drivelines. The slotted design accommodates a cotter pin or tab washer, ensuring the nut remains locked even under extreme vibration. The SKU 0737.502.171 is specifically machined to maintain exact thread pitch and hardness specifications required for reliable torque retention. When installed alongside the 2093101016: HOUSING, this nut forms a critical interface that maintains proper gear mesh alignment and bearing preload within the transmission assembly.

Symptoms of Failure

• Transmission oil leaks at shaft output seals: When the slotted nut loosens, shaft end-play increases, distorting seal contact surfaces and causing fluid seepage. This is a common failure symptom in ZF WG-series transmissions operating under heavy loads.
• Gear slipping under load or erratic engagement: A worn or stripped 0737.502.171 nut allows the shaft to shift axially, disrupting gear tooth contact patterns. Operators may notice intermittent power loss or grinding noises during acceleration.
• Unusual vibration or driveline chatter: As the nut loses clamping force, bearing preload drops, allowing radial play. This generates low-frequency vibration that intensifies with vehicle speed, often misdiagnosed as a bearing failure.
• Difficulty maintaining gear position in PTO applications: In construction machinery with power take-off units, a failing slotted nut can cause the PTO shaft to drift, leading to inconsistent hydraulic pump engagement.

Technical Specifications

Compatibility

This genuine ZF slotted nut is engineered for use in the following transmission models commonly deployed in construction machinery: WG180, WG200, WG210, and WG250 series. It is also compatible with certain Ecomat 4HP and 6HP variants where the output shaft requires a positive locking mechanism. The 0737.502.171 nut directly interfaces with the 2093301030: TRANSMISSION HOUSING and is secured using a 0631311009: GROOVED STUD to prevent rotation. Always verify the thread pitch against your transmission’s shaft before installation. For proper identification, reference the 0730365092: TYPE PLATE affixed to your transmission housing to confirm model and serial number compatibility.

Related Components

Frequently Asked Questions

Q: Can the 0737.502.171 slotted nut be reused after removal?
A: ZF recommends replacing this nut with a new OEM part whenever it is removed, as the locking features and thread integrity may be compromised after initial torque application. Reuse can lead to loosening under load.

Q: What torque specification should I use for this nut?
A: The standard installation torque is 180 Nm followed by an additional 90-degree turn, applied with a thread-locking compound. Always consult your transmission service manual for exact values, as variations exist between WG180 and WG250 models.

Q: How do I verify this nut fits my ZF transmission?
A: Locate the 0730365092: TYPE PLATE on your transmission housing. Cross-reference the model number with the compatibility list above. For additional confirmation, measure the shaft thread diameter and pitch against the M30 x 1.5 specification.