TM 5-3820-256-10
Figure 2-4 . Drawworks Controls
CONTROL or
KEY
INDICATOR
FUNCTION
1
Drawworks power switch
Operates air cylinder to engage subdrive.
2
Auxiliary and hoist drum
Engages auxiliary drum when shifted to the right,
clutch control
engages hoist drum when shifted to the left.
3
Third drum clutch control
Engages third drum clutch when pulled back.
When released clutch disengages.
4
Third drum brake lever
Engages third drum brakes.
5
Hoist drum brake lever
Engages hoist drum brakes.
6
Auxiliary drum brake lever
Engages auxiliary drum brakes.
e.
Water/Foam Injection.
Figure 2-5 . Water/Foam Injection Controls
CONTROL or
KEY
INDICATOR
FUNCTION
1
Water injection control
Turns water injection system on and off.
2
Water injection volume
Controls speed of water pump to increase and
control
decrease injected water volume.
3
Blow down valve
Relieves pressure in discharge piping.
4
Water/foam injection valve
Regulates water or foam injected into discharge
piping.
2-5
d.
Drawworks Assembly
