JLG 110HX Service Manual - Manual (Page 135)

SECTION 3 - TROUBLESHOOTING
3120864 – JLG Lift – 3-19
Function speed control will not function.
Boom above horizontal. Lower boom.
Horizontal limit switch malfunctioning. Repair or replace limit switch.
Defective pump section. Repair or replace pump section.
Electrical malfunction. See correct wiring diagram.
Table 3-6. Electrical System - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY