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The Harlan Global 007000009E4 is a replacement lock washer. It distributes load and resists loosening from vibration in high-duty-cycle GSE environments. Engineered for aviation ground support, baggage tractors, belt loaders, and tow tractors, and equally at home in industrial plants, warehouses, municipalities, and facilities maintenance.
Specifications
- OEM/Cross‑Reference: 00009E4
Installation and service should follow your vehicle’s maintenance manual. Verify compatibility using the OEM reference and your serial number.
| General Information | |
|---|---|
| Part # | 007000009E4 |
| Manufacturer | Harlan |
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AIRCRAFT COMPATIBILITY
| Compatible Aircraft* |
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QUESTIONS & ANSWERS
The Harlan 007000009E4 lock washer helps prevent bolts and nuts from loosening under the extreme vibration and continuous-duty conditions common in airport ground support equipment. Harlan tugs, baggage tractors, and tow tractors operate for long hours on uneven surfaces, which can quickly compromise unsecured fasteners. This lock washer provides added resistance to rotation, helping maintain joint integrity. Its use supports safer and more reliable equipment operation.
Harlan tugs are exposed to constant vibration, load changes, and shock forces while towing or pushing aircraft. Standard fasteners alone may loosen over time in these demanding environments. Lock washers add spring tension or surface bite, increasing friction between mating parts. This added security helps reduce maintenance issues and the risk of component failure during operations.
Lock washers work by exerting continuous tension on the fastener, resisting rotation. Split-ring designs act like a spring, while tooth-style washers dig slightly into the mating surfaces. Both methods increase friction and help absorb vibration. This mechanism keeps bolts seated more securely during prolonged use.
Lock washers are often used on engine mounts, cooling system components, brackets, guards, and structural assemblies. These areas experience frequent vibration and movement during tug operation. Proper placement of lock washers helps maintain a consistent clamping force. This ensures that critical systems remain securely fastened throughout daily service cycles.
Using worn, flattened, or incorrect lock washers can reduce their ability to resist vibration. Over time, this may allow fasteners to loosen, leading to misalignment, rattling components, or even part failure. In severe cases, loose hardware can damage surrounding systems or pose safety hazards. Replacing lock washers during maintenance helps avoid these issues.
Lock washers should be inspected during routine maintenance or whenever a fastener is removed. Signs of wear include loss of spring tension, deformation, or corrosion. Reusing compromised washers reduces their effectiveness. Installing new lock washers during reassembly helps ensure long-term fastener security.
Yes, lock washers play an important role in maintaining the overall safety and reliability of ground support equipment. While small, they help prevent fastener failures that could affect steering, braking, cooling, or structural integrity. Consistent use of proper lock washers supports compliance with maintenance best practices. Their role is especially critical in high-vibration aviation environments.
OEM-specified lock washers are designed to match the load, material, and vibration requirements of Harlan tugs. Using the correct washer ensures proper fit and performance under real-world operating conditions. Substituting incorrect hardware can reduce effectiveness and increase maintenance risk. OEM-compatible washers help maintain equipment reliability and service life.
