Comprehensive Guide for Machinery Maintenance

Table of Contents

1. General
2. Engines
3. Fuel System
4. Hydraulics
5. Steering
6. Power Train
7. Brakes
8. Electrical
9. Mounted Equipment

Manual Extract: Valve Lift Adjustment

Properly adjusting the valve lift is critical for the optimal performance of machinery. Follow these detailed steps to ensure precise adjustment:

Steps to Set Valve Lift

1. While pumping fuel through the injector, maintain a hold on the pressure adjusting screw. Gradually turn the lift adjusting screw clockwise until the valve stops opening.
   Note: Depending on the injector model, the lift adjusting screw may have either a screwdriver slot or an Allen wrench slot.
2. Increase the pressure by 200 to 500 PSI above the injector’s opening pressure to verify valve bottoming. It’s normal for some fuel to accumulate at the tip, but there should be no rapid dribble. Do not use excessive force to avoid bending the valve.
3. Rotate the lift adjusting screw counterclockwise for 3/4 of a turn to achieve the specified lift. While holding the lift adjusting screw, secure it by tightening the locknut to 35 to 45 inch-pounds. Utilize the Snap-On Tool 1/4″ Crow’s-foot Wrench No. AN 9508-6 and a suitable inch-pound torque wrench.
4. Reassess the opening pressure. Remember that setting the lift is crucial before inspecting the spray pattern and chatter, as the lift adjustment influences these characteristics.