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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.

TIB 15-41 Engine Cold Start Enhancement

Models Affected: JLG Model 340AJ with Dual Fuel GM Engine

JLG has received reports of hard starting of the JLG® Model 340AJ equipped with GM .97L dual fuel engine while operating on gasoline and in cold weather applications.

The engine supplier has developed updated ECM software for the GM .97L dual fuel engine. If your machine experiences difficulty starting in cold weather, please contact the JLG District Service Manager (DSM) or Service Provider in your region to schedule the software installation.

When equipped with the recommended engine oil (5W-30) and the ECM software update, the engine should start in temperatures as low as +15oF. For use in temperatures below 15oF, JLG offers optional Cold Weather Start* and an Artic packages**.

*The Cold Weather Start package includes a battery blanket, a hydraulic tank heater and an engine block heater.

**The Arctic package includes the same items in the Cold Weather Start package plus arctic hoses (drive and steer only) and a main boom cable, extreme cold weather engine oil, fuel conditioner and an oversized foot switch.