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Failure to obey the instructions and safety rules in the appropriate Operator's Manual and Service Manual for your machine will result in death or serious injury. Many of the hazards identified in the operator’s manual are also safety hazards when maintenance and repair procedures are performed.

Do Not Perform Maintenance Unless:

  1. You are trained and qualified to perform maintenance on this machine.
  2. You read, understand and obey:
    1. manufacturer’s instructions and safety rules
    2. employer’s safety rules and worksite regulations applicable governmental regulations
  3. You have the appropriate tools, lifting equipment and a suitable workshop.

Miller Generator - No Output

Models Affected : JLG® Boom Lifts (Equipped with Generators)

There are two very common reasons for No A/C Voltage Output from a Miller Generator installed on JLG boom lifts. Fortunately these issues can be very easily rectified. The first most common cause occurs when the generator option is not turned on in the analyzer. To turn this option on, plug in your analyzer at either location (platform or ground) and enter your Access Level 1 code. Under the Machine Set Up menu, you will find the generator options 0 = NO, 1 = Belt Drive and 2 = Hyd Drive (Hydraulic). Select the appropriate selection for your machine and then shut it down to allow your change to be saved.

The second cause that is a commonly overlooked is the inline 5 amp fuse, JLG P/N 8229242-005. Fuse Holder P/N is 2400060. This fuse is located behind the engine tray near the start and auxiliary power solenoids. If this fuse is blown, the machine has no D/C voltage going to the generator control system to turn it on. Replace a blown fuse with the appropriate 5 amp fuse.