Crawler crane setup, stabilization, and boom configuration
Crawler crane setup, stabilization, and boom configuration
This domain tests assembly and set-up: getting the machine level, building the boom correctly, and configuring reeving and counterweight so the load chart actually applies.
Set-up rules
- Prepare a level, drained, compacted assembly area; block boom sections on timber so chords and lacings are not damaged.
- Level the crane within the manual tolerance before booms are raised; an out-of-level machine invalidates the chart.
- Fit boom sections in the correct order, drive every connecting pin fully home, and fit retainers. Check boom foot pins, boom stop and pendant rope tension.
- Assemble the counterweight stack specified for the chart you will use; a partially stacked counterweight changes capacity.
- Set parts of line from the reeving chart for the load, route rope through the correct sheaves, and seat the wedge socket correctly.
- Confirm the house lock pin and swing lock for travel, and that boom or jib offset matches the chart.
Worked example
A 100 t crawler on two 900 mm shoes, 6.5 m long: contact area = 2 × 0.9 × 6.5 = 11.7 m², so ground pressure ≈ 100 / 11.7 ≈ 8.5 t/m² (about 84 kPa) before dynamic allowance. If site survey gives 60 kPa for the compacted fill, mats sized to spread the load must be added before assembly.
Traps
Reading a chart while the machine is out of level; assuming truck-crane outrigger logic; leaving pin retainers off; ignoring how parts of line and reeving affect capacity; assembling the boom over soft or sloping ground.