Overview
This genuine OEM ZF 5838.300.340 slotted nut is a critical locking component designed to secure gear assemblies and bearings on the output shaft of heavy-duty construction machinery transmissions. Machined from high-tensile steel, the slotted nut engages with a cotter pin or locking tab to prevent rotational loosening under extreme vibration and torque loads. The SKU 5838.300.340 is specifically engineered to maintain precise axial preload on differential and bearing stacks, ensuring that the entire drivetrain remains properly tensioned during operation. When installed alongside the 5838109009: DIFFERENTIAL and the 0750117075: TAPER ROLLER BEARING, this nut forms the final mechanical lock that keeps the rotating assembly stable.
Symptoms of Failure
- Progressive oil seepage from the output shaft seal: When the slotted nut loses its clamping force, the 5838300626: DIFFERENTIAL HOUSING can shift, breaking the seal surface and causing transmission fluid to weep steadily.
- Audible clunking during gear engagement: A loose 5838.300.340 nut allows axial play in the 2093209023: DIFFERENTIAL assembly, producing a metallic knock when torque is applied or released.
- Premature taper roller bearing failure: Without proper nut preload, the 0750117075: TAPER ROLLER BEARING experiences uneven loading, leading to brinelling and rough rotation within 200 operating hours.
- Vibration in the driveline at low speeds: A worn or stripped slotted nut cannot maintain the required crush sleeve preload, causing the entire differential carrier to wobble and transmit vibration through the chassis.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Number (SKU) | 5838.300.340 |
| Thread Size | M30 x 1.5 (estimated) |
| Outer Diameter | 42 mm |
| Height (Thickness) | 12 mm |
| Slot Width | 4.5 mm (6 slots) |
| Material | Case-hardened alloy steel (SAE 4140 equivalent) |
| Surface Treatment | Zinc-nickel plating, 480-hour salt spray resistance |
| Weight | 0.085 kg |
| OEM Reference | ZF 5838.300.340 |
| Torque Specification | 180 N·m + 90° turn (dry) |
Compatibility
This genuine ZF slotted nut is a direct replacement for transmissions in the WG series and heavy-duty off-highway applications. It is commonly specified for the ZF WG180, WG200, and WG210 transmission models used in wheel loaders, graders, and compactors. The 5838.300.340 nut also fits select ErgoPower and Ecolife drivelines where the output shaft requires a positive locking mechanism. Always verify thread pitch and slot alignment with your existing 5838300626: DIFFERENTIAL HOUSING before installation.
Related Components
| Part Number | Name | Function |
|---|---|---|
| 5838109009 | DIFFERENTIAL | Distributes torque between axle shafts |
| 0750117075 | TAPER ROLLER BEARING | Supports radial and axial loads on the pinion shaft |
| 2093209023 | DIFFERENTIAL | Secondary differential assembly for tandem axles |
| 5838300626 | DIFFERENTIAL HOUSING | Encloses and supports the differential gear set |
| 0631329088 | SPRING PIN | Locks the slotted nut into the shaft groove |
| 5838300811 | THRUST WASHER | Controls axial clearance between differential gears |
| 5838300721 | AXLE BEVEL GEAR | Transfers power from the ring gear to the axle shaft |
| 5838300633 | AXLE | Driveshaft connecting differential to wheel hub |
| 5838300753 | THRUST WASHER | Reduces friction on the side gear face |
| 5838300818 | THRUST WASHER | Provides wear surface for the pinion cross shaft |
Frequently Asked Questions
Q: Can I reuse the 5838.300.340 slotted nut after removal?
A: No. This is a torque-to-yield fastener that permanently deforms during initial tightening. Reuse risks insufficient clamping force and sudden loosening. Always install a new nut with a fresh 0631329088: SPRING PIN.
Q: What is the correct torque sequence for this nut?
A: Tighten to 180 N·m, then rotate an additional 90 degrees. After the first 50 hours of operation, recheck the nut—if any rotation is detected, replace both the nut and the 5838300811: THRUST WASHER.
Q: Will this nut fit a ZF WG180 transmission from 1998?
A: Yes, the 5838.300.340 is backward-compatible with all WG180, WG200, and early WG210 transmissions using a 30 mm threaded output shaft. Verify that your 5838300633: AXLE has six matching slots for the locking pin.
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