©Copyright Task Force Tips LLC 2002-2020 LIX-512 August 17, 2020 Rev09
9
5.0 MANUAL EXTEND-A-GUN SIDE LOADS AT MOUNTING POINTS WORKSHEET
An interactive version of this worksheet is available at tft.com/Library/Instructions for Installation, Safe Operation and Maintenance.
Reaction forces generated by master stream ows are capable of causing injury and property
damage if not properly supported. The Extend-A-Gun must be securely mounted to rigid truck
structural members.
Before installing the Extend-A-Gun, qualied persons MUST determine the forces that will be
exerted and select suitable structural members and bracket mounting locations.
• Nozzle reaction force which can be as high as 900 lbf (400 kg) for 3” models and 1500 lbf (680
kg) for 4” models.
• The forces acting on the mounting brackets when the Extend-A-Gun is in the extended
position are higher than the forces in a normal deck gun installation. Use SIDE LOADS AT
MOUNTING POINTS worksheets for calculations
• Install the upper and lower brackets as far apart as possible to minimize the amount of stress
on the brackets.
Qualied individuals should install mounting brackets, Extend-A-Guns and monitors.
• The Extend-A-Gun must be securely mounted to rigid truck support members.
• Do not use anges or pipe made from plastic for monitor mounting.
• Inferior welding or poor plate installation could result in serious injury or equipment damage.
• Torque all fasteners to specied values.
I certify that I have accurately and completely worked through the Extend-A-Gun XG12 Side Load Worksheet prior to Extend-A-Gun installation.
NAME:_____________________________________________ DATE:__________________
1) Determine the distance, D1, in inches,
from the center of the monitor elevation joint
to the bottom of the threads in the monitor inlet.
Task Force Tips CROSSFIRE
Elkhart Stinger Mod. 8297-98 w/companion flange
Akron Apollo Mod. 3422 w/companion flange
Akron Apollo Mod. 3422 threaded on
D1 FOR MOST COMMON INSTALLATIONS
D1 = 1”
D1 = 4”
D1 = 5”
D1 = 6”
D1= inches
2) Locate the value of D1 in the charts on the following
page. Find the desired HEIGHT (from the center of
the upper bracket to the center of the stream) in the
HEIGHT column.
3) Locate D2 (the distance from the bottom of the latch
casting to the center of the upper mounting bracket)
for the chosen HEIGHT in inches.
D2= inches
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 abd D3 max.
D3= inches
WHEN D2 IS LARGE AND D3 IS SMALL
THE REACTION FORCES, F1 & F2, ON
THE BRACKETS ARE LARGER.
WHEN D2 IS SMALL AND D3 IS LARGE
THE REACTION FORCES, F1 & F2, ON
THE BRACKETS ARE SMALLER.
ALWAYS MAKE D3 AS LARGE AS POSSIBLE.
D1
F1
F2
D2
D3 15.7"
C Clamp
5) Calculate forces on brackets:
D1 + D2
+ D3 + 15.7 = L inches
6) Multiply L by 900:
L X 900 = M inches · pounds
M /D3 = F1
pounds
- 900 = F2 pounds
F1
F1 MUST be less than 3100 lbf. F2 MUST be less than 2200 lbf.
The proposed installation MUST be capable of withstanding forces of this magnitude.
