JLG Triple-L Operator Manual - Manual (Page 51)

SECTION 4 - SERVICE AND MAINTENANCE
3121224 – Triple-L-Trailer – 4-11
9. Attempt to rotate the wheels in a forward direction. If
any of the wheels rotate, the brakes must be
adjusted.
4.4 TRAILER CONNECTION TO TOW VEHICLE
Coupler and Ball
The coupler on the trailer connects to the ball attached to
the hitch on the tow vehicle. The coupler, ball and hitch
transfer the towing forces between the tow vehicle and the
trailer. Before each tow, coat the ball with a thin layer of
automotive bearing grease to reduce wear and ensure
proper operation; and check the locking device that
secures the coupler to the ball for proper operation.
See the coupler manufacturer’s manual for other inspec-
tion and maintenance activities. If you do not have this
manual, contact a JLG representative at 1-877-JLG-SAFE
(554-7233) between the hours of 8:00 AM and 4:45 PM
Eastern Standard time.
If you see or feel evidence of wear, such as flat spots,
deformations, pitting or corrosion, on the ball or coupler,
immediately have your dealer inspect them to determine
the proper action to prevent possible failure of the ball and
coupler system. All bent or broken coupler parts must be
replaced before towing the trailer.
The coupler must operate properly and automatically
snap into the latched position. Oil the pivot points, sliding
surfaces, and spring ends with SAE 30W motor oil. Keep
the ball pocket and latch mechanism clean. Dirt or con-
tamination can prevent proper operation of the latching
mechanism.
When replacing a ball, the load rating must match or
exceed the GVWR of the trailer.
4.5 TONGUE JACK
Operating
Rotate the jack handle clockwise to raise the jack, or
counterclockwise to lower the jack.
Drop Foot Operation - Pull the hitch pin, lower or raise
drop foot to desired position, return the hitch pin making
sure it is fully inserted through both the inner tube and the
drop tube before using the jack.
Maintenance
The internal gearing and bearings of the jack must be kept
lubricated. Using a grease gun, apply automotive grease
to the gears. Rotate the jack handle to distribute the
grease evenly. Lightly grease the inner tube of the jack
using the same type of grease. A light weight oil must be
applied to the handle unit at both sides of the tube.
OIL
GREASE
GEARS
INNER
TUBE