ZF 0730.303.029 SHIM | OEM Genuine Part

Overview

Precision shimming is critical for maintaining correct gear mesh and bearing preload in heavy-duty ZF transmissions. The ZF 0730.303.029 SHIM is an OEM genuine part designed to establish precise axial clearances within the differential assembly of construction machinery transmissions. This thin, hardened steel component sits between the differential housing and bearing races, compensating for manufacturing tolerances and wear over time. The SKU 0730.303.029 is specifically calibrated to ensure that the 5838109012: DIFFERENTIAL and its mating gears operate within factory-specified backlash limits, preventing premature fatigue on adjacent components like the 0750117075: TAPER ROLLER BEARING.

Symptoms of Failure

When the ZF 0730.303.029 shim wears, collapses, or is incorrectly selected during rebuild, several distinct failure modes emerge. Watch for these specific symptoms to catch drivetrain damage early:

• Excessive differential bearing play – A loose shim allows the 2093209023: DIFFERENTIAL to shift axially, creating a noticeable clunk when shifting between forward and reverse under load.
• Oil leaks at the axle housing seal – Worn shims alter the position of the 5838300626: DIFFERENTIAL HOUSING, causing seal misalignment and gear oil seepage around the output flanges.
• Gear whine under acceleration – Incorrect shim thickness changes the contact pattern between the ring and pinion, producing a high-pitched whine that worsens as load increases.
• Premature bearing failure – A collapsed shim removes preload from the taper roller bearings, leading to brinelling and metallic debris in the oil within 500 operating hours.

Technical Specifications

Parameter	Value
OEM Part Number	0730.303.029
Material	Hardened spring steel (C67S equivalent)
Outer Diameter	68.5 mm
Inner Diameter	52.0 mm
Thickness	0.50 mm (selective fit range available)
Weight	12 grams
Surface Finish	Ground, deburred edges
Hardness	HRC 45-50

Compatibility

This shim is engineered for ZF powershift and torque converter transmissions commonly found in wheel loaders, graders, and excavators. Based on its dimensional profile and application, the 0730.303.029 is compatible with the following transmission models:

• ZF WG180 (all series)
• ZF WG200 (early and late variants)
• ZF 4WG-200
• ZF 6WG-200
• ZF Ergopower (selected models with 52mm inner bore differentials)

Always verify shim thickness using a micrometer during rebuild, as selective fit shims are used to achieve the correct preload on the 0750117075: TAPER ROLLER BEARING.

Related Components

Part Number	Name	Function
5838109012	DIFFERENTIAL	Distributes torque to axle shafts; mates directly with shim for clearance control
0750117075	TAPER ROLLER BEARING	Supports differential rotation; preload set by shim thickness
2093209023	DIFFERENTIAL	Alternative differential variant for specific gear ratios
5838300626	DIFFERENTIAL HOUSING	Encloses differential assembly; shim sits between housing and bearing
0631329088	SPRING PIN	Secures shim and bearing stack in position during assembly
5838300811	THRUST WASHER	Controls axial end-play of differential side gears
5838300721	AXLE BEVEL GEAR	Transfers power from differential to axle shafts
5838300633	AXLE	Output shaft connecting differential to wheel hub
5838300753	THRUST WASHER	Reduces friction between differential case and side gears
5838300818	THRUST WASHER	Thicker variant for adjusting differential clearance

Frequently Asked Questions

Q: How do I know if the ZF 0730.303.029 shim is the correct thickness for my rebuild?
A: Measure the existing shim stack with a micrometer and compare to the factory service manual specification for your specific ZF transmission model. The 0.50mm shim is a common baseline, but selective fit shims in 0.05mm increments are available to achieve the exact preload required for the taper roller bearing.

Q: Can I reuse the 0730.303.029 shim during a differential overhaul?
A: ZF recommends replacing all shims during a major rebuild. The hardened steel can take a compression set over time, and reusing a worn shim will lead to incorrect bearing preload and premature failure of the differential assembly.

Q: What happens if I install this shim in the wrong orientation?
A: The 0730.303.029 is symmetrical and can be installed in either orientation. However, ensure the shim is centered on the bearing race shoulder and that no burrs or debris are trapped between the shim and the differential housing.