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Steering Wheel and Steering Column Controls.
Transmission Controls.

Scraper, Earth Moving, Motorized, Diesel Engine Driven Model 621B
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TM 5-3805-248-10
DESCRIPTION AND USE OF OPERATOR CONTROLS AND INDICATORS - CONTINUED
0004 00
DRIVING CONTROLS - CONTINUED
2.
Floor-Mounted Controls.
29
30
28
394-160
32
31
KEY
CONTROL OR INDICATOR
FUNCTION
28
Headlight Dimmer Switch
Depress dimmer switch to change headlight beams from low to high
beam. Press switch again to return headlights beams to low beam.
29
Service Brake Pedal
Press pedal down to apply service brake and illuminate brake lights.
30
Accelerator Pedal
Press pedal down to increase engine speed and release to decrease
engine speed. Pull to shut down engine.
31
Differential Lock Control Pedal
Allows operator to lock differential to prevent wheel slippage when
operating on soft or wet ground and when loading. Press down and
hold pedal to engage differential lock. Release pedal to disengage
differential lock. Do NOT turn (steer) machine with differential lock
engaged.
32
Transmission Hold Pedal
Press pedal down to engage transmission hold. When engaged,
transmission will not shift. Release pedal and transmission shifts
normally.
0004 00-9


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