Dorman 42823 Windshield Wiper Arm User Manual

1. Introduction

The Dorman 42823 Windshield Wiper Arm is engineered as a direct replacement component, designed to match the fit and function of the original equipment on specified vehicles. This arm is constructed from quality materials to ensure durability and reliable performance, restoring proper windshield clearing functionality.

Key Features:

• Direct Replacement: Designed to precisely match the original arm's fit and function.
• Restores Functionality: Provides a reliable solution for wiper arms compromised by wear, damage, or fatigue.
• Durable Construction: Manufactured with quality materials for extended service life.
• Trustworthy Quality: Supported by Dorman's extensive automotive experience and product expertise.

Vehicle Compatibility:

This part is compatible with the following Isuzu models. Always verify fitment for your specific vehicle trim before installation.

• Isuzu NPR: 2007-2018
• Isuzu NPR-HD: 2007-2018
• Isuzu NPR-XD: 2015-2018
• Isuzu NQR: 2011-2018
• Isuzu NRR: 2008-2018

2. Product Overview

Below are images of the Dorman 42823 Windshield Wiper Arm, showcasing its design and components.

Figure 2.1: Full view of the Dorman 42823 Driver Side Windshield Wiper Arm. This image displays the complete arm, from the mounting point to the blade attachment hook.

Figure 2.2: Top-down view of the wiper arm, highlighting the spring mechanism and overall structure.

Figure 2.3: Close-up view of the arm's pivot point and the tension spring, showing the robust construction.

Figure 2.4: Detail of the blade attachment end of the wiper arm, showing the hook-style connection.

3. Setup and Installation

Proper installation of the Dorman 42823 Windshield Wiper Arm is crucial for optimal performance and safety. It is recommended to consult your vehicle's service manual for specific instructions related to your model. The following are general steps for replacement:

1. Prepare the Vehicle: Park the vehicle on a level surface and turn off the ignition. Lift the existing wiper arm away from the windshield.
2. Remove Old Wiper Arm: Locate the retaining nut or clip at the base of the wiper arm where it attaches to the wiper motor spindle. Remove the nut (if present) and carefully pull the arm off the spindle. Some arms may require a wiper arm puller tool.
3. Clean Spindle: Inspect the wiper motor spindle for any corrosion or debris. Clean the spindle thoroughly to ensure a secure fit for the new arm.
4. Position New Wiper Arm: Place the new Dorman 42823 wiper arm onto the spindle. Ensure the arm is positioned correctly on the windshield, typically in the "park" position (at the bottom of its sweep) before fully seating it. This is critical for proper wiper sweep.
5. Secure Wiper Arm: Push the new arm firmly onto the spindle until it is fully seated. If a retaining nut was removed, re-install and tighten it to the manufacturer's specifications. If it uses a clip, ensure it locks securely.
6. Test Operation: Gently lower the wiper arm onto the windshield. Turn on the vehicle's ignition and test the wiper system at all speeds to ensure proper function and full sweep without hitting the vehicle's trim.

Important Note: Always ensure the correct fitment for your specific vehicle model and year. Refer to the compatibility list in Section 1.

4. Operation

Once installed, the Dorman 42823 Windshield Wiper Arm operates in conjunction with your vehicle's existing wiper motor and linkage system. The arm provides the necessary tension and leverage to press the wiper blade against the windshield, ensuring effective clearing of rain, snow, and debris.

To operate the wipers, use your vehicle's standard wiper controls, typically located on a stalk behind the steering wheel. Refer to your vehicle's owner's manual for detailed instructions on wiper speed settings, intermittent functions, and washer fluid activation.

5. Maintenance

Regular maintenance helps prolong the life of your wiper arm and ensures clear visibility.

• Regular Inspection: Periodically inspect the wiper arm for any signs of damage, bending, or corrosion. Check the tension spring to ensure it provides adequate pressure against the windshield.
• Cleanliness: Keep the wiper arm and the area around its pivot point clean from dirt, leaves, and other debris that could impede its movement.
• Wiper Blade Condition: While this manual is for the arm, the performance of the entire system depends on the wiper blade. Replace wiper blades regularly (typically every 6-12 months) or at the first sign of streaking, chattering, or skipping.
• Winter Care: In snowy or icy conditions, ensure the wiper blades are not frozen to the windshield before operating them. Attempting to operate frozen wipers can damage the wiper arm or motor.

6. Troubleshooting

If you experience issues with your windshield wipers after installing the Dorman 42823 arm, consider the following:

• Wiper Not Clearing Effectively:
  • Check the wiper blade for wear, cracks, or debris. Replace if necessary.
  • Ensure the wiper arm is securely attached to the spindle and not loose.
  • Verify the arm's tension spring is providing adequate pressure. If the arm lifts off the windshield at speed, the spring may be weak or damaged.
• Wiper Arm Loose or Detaching:
  • Re-check the retaining nut or clip at the base of the arm. Ensure it is tightened to specification or fully engaged.
  • Inspect the spindle for damage or wear that might prevent a secure fit.
• Incorrect Park Position or Sweep:
  • This often indicates the arm was not installed in the correct position on the spindle. Remove the arm and re-install it, ensuring it is in the proper "park" position before securing.
• Compatibility Issues (Older Models):
  • While designed for specific models, some users have reported that for older models (e.g., early 1990s Isuzu NPR/NRR), the arm length might be different, or the base attachment may require modification (e.g., swapping bases). Always verify fitment before permanent installation.

If troubleshooting steps do not resolve the issue, it is recommended to seek assistance from a qualified automotive technician.

7. Specifications

8. Warranty and Support

Dorman products are known for their trustworthy quality, backed by a team of product experts in the United States and over a century of automotive experience. While specific warranty details are not provided in this manual, Dorman stands behind its products.

For technical assistance, warranty inquiries, or further support, please visit the official Dorman website or contact their customer service department.

Dorman Official Website: www.dormanproducts.com