JLG 45e ANSI Service Manual - Manual (Page 84)

SECTION 3 - TROUBLESHOOTING
3-8 – JLG Lift – 3120743
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.
Restrictor valve plugged. Clean or replace restrictor valve.
Table 3-2.Boom Assembly - Troubleshooting