3-8 Published 12-21-2011 CTRL #050-09
CONTROLS AND OPERATING PROCEDURES 1300A OPERATOR’S MANUAL
checklist of items are suggested to ensure the crane is
prepared for performing work operations. Check:
• for any unusual conditions such as pools of hydraulic
fluid or lubricating oil under the chassis, any outrigger
which may have crept down or up and any signs of
damage or improper maintenance.
• the tires are inflated to the proper pressure.
• the level of the hydraulic reservoir.
• the operation of the “stop” and horn circuits.
• for missing and loose bolts.
• for damaged structural members and welds.
• all rope guides and cable keepers.
• all sheaves for free turning.
• the hoist cable for kinks, broken strands or other
damage in accordance with instructions on page 6-2.
• to see that the hydraulic hoses and fittings are in good
condition and show no signs of leaking. The hoses
should be free from cuts and abrasions and there should
be no evidence of binding. Any damage or leakage
should be repaired immediately.
• the LMI and anti-two-block system for proper operation.
• the electrical wiring connecting the various parts of the
system for physical damage.
NOTE: Consult the truck manufacturer’s manual for
vehicle checks.
Cold Weather Operation
The following recommendations are for operating National
cranes in very low (i.e., sub-zero) temperatures.
Cranes should have appropriate hydraulic oil, lubricants, and
other auxiliary items required for operation in sub-zero
temperatures. Operate individual crane functions to ensure
they are sufficiently warmed prior to performing a lift.
Operation of cranes at full rated capacities in temperatures
between -18°C (0°F) and -40°C (-40°F) or lower should be
accomplished only by competent operators who possess the
skill, experience, and dexterity to ensure smooth operation.
Shock loading shall be avoided.
Derated capacities for each °C below -40°C
Derate the rated load shown on the capacity charts 3.67
percent for each degree celsius below -40° C.
Derated capacities for each °F below -40°F
Derate the rated load shown on the capacity charts 2 percent
for each degree fahrenheit below -40° F.
Anti-two-block Check
Check the anti-two-block alarm light and the audible alarm
by lifting the anti-two-block weight until the switch is
activated. To check the anti-two-block switch:
• manually lift the weight.
• slowly raise the hoist cable.
• slowly extend (telescope) the boom.
If the crane is equipped with a jib that is deployed and rigged
for work, repeat the test procedure for the jib anti-two-block
switch.
LMI Check
Perform the following checks to verify proper LMI operation .
• Check that the display of the main boom length agrees
with the actual boom length.
• Check that the display of the main boom angle agrees
with the actual boom angles.
• Check that the display of the operating radius of the
crane agrees with the actual radius.
Check the load display by lifting a load of known weight. The
accuracy of the load indication shall be within the tolerance
of SAE J159.
DANGER
The following tests must be performed with caution to
prevent damage to the machine or injury to personnel.
DANGER
If the light and audible alarm do not function and the hoist
does not stop, the system is not working properly and
must be corrected before operating the crane.
DANGER
A deviation between displayed and actual values
indicates a malfunction and a LMI service representative
shall be called for repair and/or recalibration of LMI
system.
Reference Only
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