National Crane Published 5-27-2018 Control # 039-06 2-31
800D OPERATION
ADJUSTABLE SWING SPEED VALVE
The Series 800D is equipped with an adjustable swing speed
valve. This valve allows the operator to limit the maximum
swing speed of the machine to suit operator preference or
varying applications.
An adjustment dial is located on the swing holding valve
mounted on the swing motor inside the crane frame. The
valve has an adjustment screw with a lock collar. Loosen the
lock collar when adjusting the speed, then tighten the lock
collar to maintain swing speed limit setting. Turning the knob
counter-clockwise reduces the rotation speed. The
adjustment dial allows the maximum swing speed to be
reduced as follows:
Number of
Turns
Approximate
Max. Swing Speed
(375° Rotation)
Percent Full
Speed
Closed
1
2
3
4
45 sec
48 sec
53 sec
61 sec
89 sec
100%
90%
80%
70%
50%
SWING SPEED
ADJUSTMENT
VALVE
9370
Fo
r
Reference
Only
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