| 摘要 |
PROBLEM TO BE SOLVED: To prevent detecting operation such that mistakes are caused in a gravity type derricking angle detector during an operation at a high lift with a high lift working vehicle stopped on a slope. SOLUTION: Anglesϕ1,ϕ3 detected by a boom derricking angle detector 31 are compared with a predetermined rangeϕ2 of angles by an abnormality judging means, and an abnormality signal is output if the detected anglesϕ1,ϕ3 are out of the predetermined rangeϕ2 of angles. The abnormality signal from the abnormality judging means is transmitted to an abnormality alarm means, and the abnormality alarm means displays the abnormality on receiving the signal. Then a storage detector 32 detects whether or not a boom 13 is in a stored state, and if the storage detector 32 detects that it is in the stored state, an alarm operation stopping means stops the alarm operation done by the abnormality alarm means.
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