©Copyright Task Force Tips LLC 2002-2019
LIX-518 January 23, 2019 Rev12
7
4) Determine the distance, D3 in inches, from the center of the upper mounting
bracket to the center of the lower mounting bracket for the proposed installation. D3
MUST be between D3 min and D3 max.
D3=
inches
5) Calculate forces on Brackets, Add D1 + D2 + D3 + 15.7 =
D1
+ D2
+ D3
+ 21.7 = L
inches
6) Multiply L x 900
L
X 900 = M
inches • pounds
7) Divide M by D3
M
/D3
= F1
pounds
8) Subtract 900 from F1
F1
- 900 = F2
pounds
NOTE:
F1 MUST be less than 3100 lbf. F2 MUST be less than 2200 lbf. And the proposed installation MUST be capable of
withstanding forces of this magnitude.
WARNING
Injury can result from an inadequately supported monitor. The monitor mount must be capable of
supporting the nozzle reaction force which can be as high as 900 lbf. (400 kg). Flanges and pipe
made from plastic are inadequate for monitor mounting and must not be used.
5.0 INDICATOR SWITCH WIRING
The Extend-A-Gun latch mechanism contains a magnetic switch. This switch is intended to be used with a MONITOR EXTENDED
warning light. The magnetic switch in the Extend-A-Gun is a normally open switch, and the switch is closed when the Extend-A-Gun
is in the down position. The enclosed relay MUST BE USED to limit the current through the switch.
V4155 Relay 12VDC
15VDC Max
10 Watt Coil Max
EXTEND-A-GUN
SWITCH
MOUNT RELAY ON
ELECTRICAL PANEL
BATTERY
SPARE
CIRCUIT
BREAKERS
87
86
85
30
87a
SWITCH IS CLOSED WHEN
EXTEND-A-GUN IS IN THE DOWN POSITION
MOUNT PANEL
LIGHT IN DASH
1) Screw the threaded switch body into the tapped hole in the Extend-A-Gun latch casting after the Extend-A-Gun is
permanently installed. Be careful not to twist or break the wires.
2) Mount the relay on the electrical panel with the terminals accessible.
3) Drill a 1/2” diameter hole in the dash board for the panel light. Leave enough room for a 1-13/16” diameter label around the
light or a 2” wide x 1-1/2” high label next to the light. Apply one of the two warning labels and push the panel light through the
hole in the dash.
4) Connect the labeled wires on the switch to terminal #85 on the relay and ground respectively.
5) Connect the terminals on the panel light to terminal #87A on the relay and ground respectively.
6) Connect a wire from a “spare” position on the trucks circuit breaker panel to terminals #30 and #86. The circuit from the “spare”
position in the fuse block should only be energized when the ignition switch is in the ON position.
