Condition and method Safety and notice
Holding
performance
1. Angle lowered by 5°±2° from jib tilt angle
upper limit (minimum offset angle)
2. Boom angle: 60°±2°
3. Engine stop
4. No load
Inspection method
Read the variation of the jib tilt angle from
the AML display after leaving with no initial
retraction for 2 hours.
• Due to the holding failure
of telescoping, elevating,
or jack cylinder during
measurement, the
vehicle and surrounding
vehicles can be
damaged. Therefore,
hoist up the hook block
near the two-blocking
position, and set up the
crane paying attention to
boom directions.
Jib
telescoping
1. Each jib section extended by
approximately 1 m.
(*3)
2. Jib offset angle: 5°±2°
3. Boom angle: 60°±2°
4. Engine stop
5. No load
Inspection method
Read the variation (retraction amount) of the
jib length from the AML display after leaving
as it is for 2 hours.
• Check the boom length on the integrated
information screen in the AML maintenance
mode. (Displays the value to the second
digit after decimal place.)
1. Boom stowed over-front
2. Suspension locked
3. On-rubber
4. Stop the engine and turn off the power.
5. Oil temperature: normal temperature
Inspection method
Check the displacement by measuring the
dimensions again after 15 hours.
• Complete the leveling.
• Mark the points for
dimension measurement
on the fender end above
the tire and on the tire.
Jack-up
1. Boom stowed over-front
2. Suspension locked and axle held
3. Extend the outriggers and set the machine
horizontally. (Raise the tires off the
ground.)
4. Stop the engine and turn off the power.
5. Oil temperature: normal temperature
Inspection method
Check the displacement by measuring
the dimensions again after 15 hours.
(*3): Because the jib of GR-120F is not equipped with emergency telescoping function,
fully extend the 2nd and 3rd jib sections, and extend 4th, 5th, and 6th jib sections by 1 m for each.
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