JLG 110HX ANSI Service Manual - Manual (Page 126)

SECTION 3 - TROUBLESHOOTING
3-6 – JLG Lift – 3120636
BOOM SWING SYSTEM
No response to swing control.
Hydraulic system oil low. Replenish oil as necessary.
Swing control switch not functioning. Repair or replace swing control switch.
Restricted or broken supply line on valve bank or
hydraulic pump. Clean or replace line.
Control valve not functioning properly. Repair or replace valve.
Swing motor not functioning properly. Repair or replace motor.
Restrictor valve(s) plugged. Clean or replace restrictor valve.
Foreign objects(s) wedged between swing
motor pinion and swing gear. Remove objects, check for damage, and repair
or replace component(s) as required.
Sheared shaft on swing motor/brake. Repair or replace motor/brake.
Pressure reducing valve in swing circuit malfunc-
tioning. Repair or replace pressure reducing valve.
No electric power to valve. See proper wiring diagram.
Boom will swing in one direction only.
Restricted or broken hydraulic line or fitting. Clean, repair, or replace line or fitting.
Control valve not functioning properly. Repair or replace valve.
Foreign object(s) wedged between swing motor
pinion and swing gear. Remove object(s), check for damage and repair
or replace component(s) as required.
Swing control switch not functioning properly. Repair or replace swing control switch.
Brake shuttle valve defective Replace shuttle valve.
Boom swings erratically in either direction.
Hydraulic system oil low. Replenish oil as necessary.
Lack of lubricant on swing gear or speed reducer
pinion. Lubricate as required. (See Lubrication Chart.)
Swing motor not functioning properly. Repair or replace swing control switch.
Worn or broken teeth on swing gear or swing
motor pinion. Replace gear(s) as required.
Swing brake not functioning properly. Repair or replace swing brake.
Restrictor valves(s) plugged. Clean or replace restrictor valve.
Table 3-2. Boom Assembly - Troubleshooting
TROUBLE PROBABLE CAUSE REMEDY