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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:
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.
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 10
1. 1/4 inch (6.4 mm) ± 1/8 inch (3.2 mm)
18