JLG 4017PS Operator Manual - Manual (Page 150)

Section 6 - Emergency Procedures
6-2 31200753
6.2 EMERGENCY LOWERING OF BOOM
In the event of total loss of engine power or hydraulic pump failure with an elevated
load, the situation must be properly evaluated and dealt with on an individual basis.
Contact the local distributor for specific instructions.
Secure the telehandler using the following procedures:
1. Clear the area around telehandler of all personnel.
2. Apply parking brake and shift transmission to NEUTRAL.
3. Block all four wheels.
4. Section off a large area under the boom with string or tape to restrict any
personnel from entering this area.