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Machine Mountable 360º Detector
Model No. 40-6791C & 40-6791M
Instruction Manual
The 40-6791C & 40-6791M are versatile, construction tough laser receivers
that can be mounted on bull-dozers, motor-graders, drag scrapers, motorized
scrapers, skidsteer loaders, backhoes and excavators. The built in super bright
display and battery pack makes the 40-6791C and 40-6791M ideally suited for
machine control applications.
40-6791C
©2011 Johnson Level & Tool - Rev. 1 1
40-6791M
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Table of Contents
1. Technical Specifications
2. Location of Parts/Components
3. Operating Instructions
Kit Contents
Description Model No. 40-6791C Qty.
Machine Mountable 360º Detector with Clamp 1
Ni-MH Rechargeable Battery Pack 1
Cable 1
Charger 1
Instruction Manual with Warranty Card 1
Hard Shell Carrying Case 1
Description Model No. 40-6791M
Machine Mountable 360º Detector with Magnet 1
Ni-MH Rechargeable Battery Pack 1
Cable 1
Charger 1
Instruction Manual with Warranty Card 1
Hard Shell Carrying Case 1
2 ©2011 Johnson Level & Tool - Rev. 1
Qty.
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1. Technical Specifications
Detecting Range: Up to 650’ (200m)
Detecting Accuracy: Fine: ± 3mm to ± 12mm
Coarse: ± 5mm to ± 25mm
Receiving Range: 10” (25cm) receiving window
Receiving Angle: 360º
Power Supply: 7.2V 3500mAH Ni-MH battery-pack
Battery Life: approx. 40 hrs. (rechargeable battery)
Operating Voltage: 12V and 24V
Charge time: 6 hrs.
Fastening Device: Clamp or magnet
Dimensions: 14.88" x 4.72" x 8.07"
Weight: 6.8 lb. (3.1kg)
Working temperature: -4°F to +122°F (-20°C to +50°C)
Additional functions: Memory function of last received signal
Accessories: Clamp (min 1.57” (40mm) circular pipe) or
(378 x 120 x 205mm) with clamp
14.80" x 3.14" x 5.86"
(376 x 80 x 149mm) with magnet
will be displayed. Powers off
automatically when voltage is low.
magnet. Cable for connecting to 12V or
24V external battery. Connecting cable for
the JLT remote display.
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2. Location of Parts/Components
Charging/Cable
Socket Cover
Receiving Window
ON/OFF
Display Window
4 ©2011 Johnson Level & Tool - Rev. 1
Magnet Base
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Magnet
Charging Light: ON: Shows the detector is charging
OFF: Shows the detector is not charging
Up LED (red) Lights: Indicates the laser beam is above
the on grade indicator
On Grade LED (green) Light: Indicates the laser beam
is level with the on grade indicator
Down LED (red) Lights: Indicates the laser beam is
under the on grade indicator
Power and Coarse/Fine Accuracy button: Turn on/off
the power and change from coarse detecting to fine
detecting
©2011 Johnson Level & Tool - Rev. 1 5
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3. Operating Instructions
This product can be used to detect any type of rotating laser.
To turn on the detector, press key, each LED will blink from top
to bottom once. The detector is ready to begin detecting the laser
beam. The detector is in coarse mode when first turned on.
Press the key again to switch to the fine mode.
Press the key for 4 seconds and the LEDs will blink from the
center to two sides. The detector is now turned off.
After the power is turned on, to switch to the fine mode press the
power key again. The two LEDs inside will blink three times simultaneously. The detector is now in fine mode.
To switch back to coarse mode, press the power key again. The two
LEDs outside will blink three times simultaneously. The detector is
now in coarse mode.
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The LEDs will show the following when detecting the laser beam:
fast
down
The
second
down red
LED blinks
fast
The laser
beam is
down
LEDs are
all off
No laser
beam is
detected
The first
up red
LED blinks
fast
The laser
beam is
up
The
second up
red LED
blinks fast
The laser
beam is
up
The green
LED blinks
fast
The laser
beam is
level with
the on
grade LED
(green)
indicator
The first
down red
LED blinks
The laser
beam is
Note: When the voltage is low the detector will power off
automatically and the unit needs to be charged.
The LED
blinks
slower
The last receiving
position has been
memorized by
the detector. The
detector will keep
blinking until it
receives another
signal or is
turned off.
©2011 Johnson Level & Tool - Rev. 1 7
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Accessories
Connect the JLT 40-6791 to the 12V or 24V battery cable.
To charge the rechargeable battery use the AC adapter. The
charging time is 6 hours.
8 ©2011 Johnson Level & Tool - Rev. 1
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The remote display 40-6792 is an optional accessory for this
detector. It can be connected to the detector with a cable. Installing
the remote display inside the cab will allow the operator to view the
five indicating arrows up close rather than on the detector.
Detector Maintenance
• Keep the unit, particularly the reception window, clean. If it does get
dirty, use a cloth to wipe it clean.
©2011 Johnson Level & Tool - Rev. 1 9
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10 ©2011 Johnson Level & Tool - Rev. 1
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