National Crane Published 10-30-2014 Control # 040-09 7-27
1400H OPERATOR AND SERVICE MANUAL INSTALLATION
ANTI-TWO-BLOCK LOAD MOMENT
INDICATOR INSTALLATION AND FUNCTION
VERIFICATION
1. 1400H model cranes equipped with DS160 LMI systems
have the LMI reel length cable routed inside the boom.
The cable has been installed and pre-tensioned at the
factory. If cable tension adjustment is required, rotate the
reel counterclockwise (in the direction of payout) and
wrap the length cable back onto the reel. Length
transducer must be zeroed after doing this (see step 10).
Disconnect the length cable at the boom tip and rotate
the length cable clockwise to remove twist.
Do not allow reel to unwind uncontrolled.
The signal cable will be damaged.
2. Insert cord plug from the boom cable reel into the mating
connector located in the frame coming from the CPU.
(See Illustrated Parts Pages.) Check cable routing to
ensure cable is unobstructed through complete range of
boom angle and rotation. Secure excess cable as
needed using nylon ties.
3. Install ATB weight assembly around load line and attach
to switch at boom tip. The length of chain used to attach
the weight can be adjusted to permit maximum crane
working height and allow securing the boom with the
loadline in the transport position. Extra chain should be
retained for use if additional load line rigging
attachments are added.
4. Route hydraulic hoses from transducers inside frame to
the lift cylinder. Connect hose with the small 90° drop to
swivel on holding valve located at base of lift cylinder
(piston side). Connect hose with larger 90° drop to tee
located at base of lift cylinder (rod side).
5. Bleed air from hydraulic hoses connecting to
transducers. Operate crane slowly while following this
procedure. It is not required to lift boom from boom rest
during bleeding procedure. With boom in boom rest,
loosen bleeder on bulkhead fitting piston side transducer
and install clear plastic hose and route to catch pan.
Slowly actuate boom up lever generating flow and
permitting air to escape and when ai r ceases to escape
tighten bleeder. With boom still in boom rest loosen
bleeder on bulkhead fitting rod side transducer and
install clear plastic hose and route to catch pan. Slowly
actuate boom down lever generating flow and permitting
air to escape and when air ceases to escape tighten
bleeder.
6. Route the two conductor cord to a convenient location in
the truck cab. Install the LMI power switch and indicator
light. A mounting plate is provided or the switch and light
may be installed in the dash. Install the label decals
adjacent to the switch. Refer to illustrated parts section
for item numbers and decal placement.
7. To ensure LMI calibration is correct, the serial numbers
of the frame, boom, and lift cylinder must match. If they
do not, the system will not work properly. If serial
numbers do not match, contact National Crane
immediately.
8. The components of this system are pre-calibrated,
however, there is an initial setup that needs to take place
to ensure proper communication between the sensors
and the processor. If the system has not yet been set up,
the maintenance screen will appear when the LMI
system is powered up. The maintenance screen will
have the options CALIBRATE SENSORS, SENSOR
OUTPUTS & EXIT.
9. The pressure transducers have been zeroed at the
factory. This step is only required if replacing or
changing the pressure transducers. Support boom and
release pressure from lift cylinder. Remove hoses from
pressure transducers.
Ensure there is no pressure in the hydraulic lines
when disconnecting the hoses from pressure
transducers.
Using the UP & DOWN keys to scroll, select “PIS” or
“ROD” and press “OK”. The screen will read BOOM
DOWN COMPLETELY AND DISCONNECT HYDR, OK,
& EXIT. Press “OK” button to zero the selected pressure
transducer. The rod and piston side pressure
transducers must be zeroed individually; therefore you
must complete this procedure for both piston and rod
side pressure transducers.
Press “EXIT” to leave calibration or select
“CALIBRATE SENSORS” to calibrate another sensor.
After zeroing both pressure transducers, reconnect
the hydraulic lines to the pressure transducers. Operate
the lift cylinder in both directions, then support the boom
and bleed any air from the hydraulic lines (using
procedure in step 5).
10. Remove cable reel cover. Fully retract main boom.
Confirm length sensor is set by rotating center screw in
large gear counterclockwise to a soft stop.
11. After selecting “CALIBRATE SENSORS” select “ANG”
to begin angle sensor calibration. Using a calibrated
inclinometer (measures to within 0.1°, Example:
SMARTTOOL DIGITAL LEVEL) adjust boom angle to 0°
(range -0.5° - +0.5°) and mechanically adjust the angle
DANGER
!
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