Booms raised on bucket trucks when not used ?

I see nearly all of the parked ( for the night ) bucket trucks ( like power line and tree trimming crews use ) leave their man-carrying buckets raised up high when not in use.
Anybody know the reason ?

 

Anti theft measure for the whole unit and many of them store heavy tools in the bucket. As for dump trucks and beds, they raise those to keep water from accumulating and pooling when parked for extended periods.

 

Most lift trucks have a safety feature that leaves the controls in the bucket/platform active. Thus if they leave it down, some drunk moron stumblinh thru campus may climb in and lift himself onto Main Hall roof and ring the bells at 0300

Not saying that ever happened . . .

 

If the engine is off what turns the hydraulic pump ?
For the lift to operate..

 

Battery

 

Auxiliary unit ?

 

The whole machine can be run from the bucket.

 

Or an opti idle ty0e set up. I don't know how it works, just that it does.

 

Verizon trucks had an Onan engine/generator unit that ran the boom and was controllable from the bucket plus a reserve system so the bucket can always get down...handy when the Onan engine ran out of gas.

 

I had one tell me they do it to keep kids and others from playing on the truck and climbing in the bucket when unattended.