Operation, Calibration & Service Manual
LinkBelt - DS350 1334 Console
The following tests shall be per formed w ith car e t o pr event dam age t o t he m achine or inj ury t o
personnel. Proper functioning of t he sy stem r equires successf ul com pletion of t hese t ests bef ore
operating the machine.
If t he lig ht and audible alar m do not f unction as descr ibed and the crane movements are not
stopped, the system is not working pr operly. T he m alfunction shall be cor rected bef ore oper ating
the crane.
Pre-Operation Inspection and Calibration Verification
1. Check the electrical wiring connecting the various parts of the system for physical damage.
2. Check the anti two-block switches and weights for free movement.
If t he oper ator cannot see t he load- handling dev ice appr oaching t he boom nose, he shall hav e an
assistant ( signal per son) watch the load- handling device. T he oper ator shall be pr epared to st op the
machine im mediately should t he LM I sy stem not f unction pr operly as indicated by lighting the red
warning light ( 4), sounding t he audible alar m ( 12) and lock ing t he cr ane m ovements, hoist up,
telescope out and boom down.
3. Check t he ant i t wo-block alar m lig ht ( 4) and t he audible alar m ( 12) by per forming one of the
following tests:
a. By manually lifting the weight attached to the anti two-block switches. When the weight is lifted,
the audible alarm (12) should sound, the anti two-block alarm light (4) should light.
b. Slowly r aise t he m ain boom load- handling dev ice t o cr eate a pot ential two-block condition.
When t he load- handling dev ice lif ts t he w eight, t he audible alar m ( 12) should sound, t he anti
two- block alar m lig ht ( 4) should lig ht and t he m otion of t he load-handling device should be
stopped. Lower the load-handling device slightly to eliminate this condition.
c. Slowly lower the boom to create a potential two-block condition. When the load-handling device
lifts the weight, the audible alar m ( 17) should sound, the anti two-block alarm lig ht ( 24) should
light and the boom lowering function should be st opped. Lower the load-handling device slightly
to eliminate this condition.
4. If the crane is eq uipped with a boom extension, repeat the test procedure for the boom extension
anti two-block switch.
5. Check that the display of the main boom angle agrees with the actual boom angles.
6. Check that the display of the operating radius of the crane agrees with the actual radius.
7. Check the load display by lifting a load of known weight.
