1. Introduction
This manual provides essential information for the proper installation, operation, and maintenance of the Unity 252040 Rear Gas Shock Absorber. This component is designed as a direct replacement for original equipment (OE) shocks in compatible vehicles, including the 2008-2012 Ford Escape and 2008-2011 Mazda Tribute. It features a twin-tube, gas-charged design for consistent performance and durability.
2. Safety Information
WARNING: Automotive suspension work can be dangerous. Improper installation can lead to serious injury or vehicle damage. It is highly recommended that installation be performed by a qualified automotive technician.
- Always wear appropriate personal protective equipment, including safety glasses and gloves.
- Ensure the vehicle is securely supported on jack stands on a level surface before beginning any work. Never rely solely on a jack.
- Refer to your vehicle's service manual for specific torque specifications and procedures.
- Gas-charged shocks are under pressure. Do not attempt to disassemble or puncture the shock absorber.
- Keep hands and clothing clear of moving parts and pinch points.
3. Package Contents
Verify that all components are present and undamaged before beginning installation.
- 1x Unity 252040 Rear Gas Shock Absorber
- Associated mounting hardware (bushings, washers, nuts) as pictured.
Figure 1: The Unity 252040 Rear Gas Shock Absorber, shown with its included upper mounting hardware, which typically consists of rubber bushings and metal washers for secure installation.
4. Specifications
| Feature | Specification |
|---|---|
| Brand | Unity |
| Model Number | 252040 |
| Auto Part Position | Rear |
| Vehicle Service Type | Car |
| Shock Type | Gas-Charged, Twin-Tube |
| Exterior Finish | Painted |
| Approximate Item Weight | 2 pounds |
| Approximate Product Dimensions | 23 x 4 x 4 inches |
| Compatible Vehicles | 2008-2012 Ford Escape, 2008-2011 Mazda Tribute |
5. Setup and Installation
This section outlines general steps for shock absorber replacement. Specific procedures may vary by vehicle. Always consult your vehicle's service manual.
5.1. Preparation
- Park the vehicle on a level, firm surface.
- Engage the parking brake.
- Loosen the lug nuts on the rear wheels.
- Raise the rear of the vehicle using a floor jack and support it securely with jack stands. Ensure the vehicle is stable.
- Remove the rear wheels.
5.2. Removal of Old Shock Absorber
- Locate the upper and lower mounting points of the existing rear shock absorber.
- Using appropriate wrenches or sockets, carefully remove the upper mounting nut and bolt. You may need to hold the shock shaft to prevent it from spinning.
- Remove the lower mounting nut and bolt.
- Carefully remove the old shock absorber from the vehicle. Note its orientation for reference during installation.
5.3. Installation of New Shock Absorber
- Install the new Unity 252040 shock absorber. Ensure the correct orientation, matching the old shock's position.
- Install the lower mounting bolt and nut first, but do not fully tighten.
- Install the upper mounting hardware (bushings, washers, nut) as shown in Figure 1. Tighten the upper nut until the bushings are slightly compressed, but do not overtighten.
- Once both upper and lower mounts are in place, lower the vehicle until the suspension is at its normal ride height (or close to it) before fully tightening the lower mounting bolt and nut to the manufacturer's specified torque. This prevents premature wear on bushings.
- Reinstall the wheels and tighten lug nuts to manufacturer specifications.
- Lower the vehicle completely and remove jack stands.
- Perform a final check of all fasteners to ensure they are properly tightened.
6. Operating Principles
The Unity 252040 is a gas-charged shock absorber designed to dampen suspension oscillations. It contains hydraulic fluid and nitrogen gas under pressure. As the vehicle's wheel moves up and down, the shock absorber's piston moves through the fluid, converting kinetic energy into heat, which is then dissipated. The nitrogen gas helps to prevent fluid cavitation, ensuring consistent damping performance and a responsive ride.
7. Maintenance
Shock absorbers are generally maintenance-free components. However, regular inspection is recommended as part of your vehicle's routine maintenance schedule.
- Visual Inspection: Periodically check the shock absorbers for signs of fluid leaks, bent or damaged shafts, or worn-out bushings.
- Mounting Points: Ensure all mounting bolts and nuts remain tight. Loose fasteners can lead to noise and premature wear.
- Cleanliness: Keep the shock absorbers free from excessive dirt and debris, which can accelerate wear on seals.
If any damage or significant wear is observed, replacement of the shock absorber is recommended.
8. Troubleshooting
Common indicators of a failing shock absorber include:
- Excessive Bouncing: The vehicle continues to bounce after hitting a bump.
- Nose Dive/Squat: The front of the vehicle dips excessively during braking, or the rear squats during acceleration.
- Uneven Tire Wear: Scalloped or cupped wear patterns on tires.
- Fluid Leaks: Visible oil or fluid leaking from the shock body.
- Noises: Clunking or rattling sounds from the suspension, especially over bumps.
- Reduced Handling: Poor steering response, body roll in turns, or a general feeling of instability.
If you experience any of these symptoms, have your vehicle's suspension system inspected by a qualified technician.
9. Warranty and Support
Unity Automotive products are manufactured to high-quality standards. For specific warranty information, terms, and conditions, please refer to the documentation provided with your purchase or visit the official Unity Automotive website. For technical assistance or support, please contact Unity Automotive customer service directly.
