JLG 4017 Operator Manual - Manual (Page 89)

Section 5 - Emergency Procedures
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Engine Failure
If the telehandler’s engine fails, the boom can be retracted then lowered manually.
Retract boom before lowering. If boom will not retract, use capacity chart to
determine if lowering load without retracting boom will exceed machine capacity.
Keep everyone clear of machine while performing the following procedure.
1. Apply the parking brake and block wheels
2. Install the cylinder block (3) on the lift cylinder. Cylinder block is located on left
side of frame in front of cab.
Retracting Boom
3. Locate the valve (4) on the crowd cylinder in the compartment in the rear of the
machine. Measure the height of the bolt on the underside of the valve. Remove
the bolt. Remove the jam nut from the bolt. Reinstall the bolt until it bottoms out.
4. Retrieve the handle located in the operator’s cab toolbox. Install the handle on
the extend/retract valve section of the main control valve in the engine
compartment (see “Valve Layout” on page 5-2). Using the handle slowly
activate the valve to retract the boom.
5. Once the boom is retracted, reinstall the jam nut onto the bolt and reinstall into
valve to previously measured height.
OZ0450
3
OZ0470
4
5