Exmark 4500-420, QDS manual Adjustments

Maintenance

Adjustments

Note: The Ultra Vac QDS was adjusted at the factory to operate properly. However, there are three basic adjustments that can be made, should your unit require them:

3.Door opening: After adjusting the hinge links for door closing, the hinge stops (Figure 10B) can be adjusted to obtain maximum door opening. The stop plates should be adjusted so that the door link contacts them when the upper tube of the door frame is within 1/4 inch (6.4 mm) ± 1/8 inch (3.2 mm) from the lower lip of the molded hood. Both left and right stops must make contact when the door link arm is at this position.

Figure 9

1.Bellcrank arm

2.Upper frame tube

3.Maintain same distance on both sides

1.Arm Position: The left and right bellcrank arms control the timing of the left and right door opening mechanisms. The ends of these arms must be positioned equally from the upper frame tube for proper actuation. Check this distance with the door closed. If adjustment is necessary, loosen the allen head clamping screw on the hub of the right hand arm. Position the arms so that their ends are the same distance from the upper frame tube. Tighten the clamping bolt to hold them in this position (see Figure 9).

2.Door closing: The closing of the door is controlled by the two hinge links (Figure 10A). The length of the hinge links can be changed to provide complete closing of the door and reasonable force on the handle to latch or unlatch the door. Lengthen the links to reduce the force. Shorten the links to increase the force. The left and right sides must be approximately equal. With the door closed, both links should be slightly tight to minimize rattling.

Figure 10

1.1/4 inch (6.4 mm) ± 1/8 inch (3.2 mm)

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