THIEMAN Series TVLR 125A, Руководство пользователя

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5. Problem Platform difficult to unfold to horizontal position OR platform hard to
fold up from horizontal position
Cause Correction
a. Torsion bar broke TVLR125/16 liftgates are equipped with a torsion bar to assist unfolding and
folding the platform. If the platform suddenly becomes heavier to fold and
unfold, the torsion bar is likely broken. Replace the torsion bar if broken.
e. Platform pivot pins are
seizing up in platform
pivots
Check that the platform pivot pins turn freely in the platform pivots. Any
tightness in these pivots will result in additional force required when
folding or unfolding the platform. If the platform gradually became harder
to fold and unfold, it is likely due to stiffness in the pivots. Replace worn
bushings or corroded pins as necessary.
6. Problem Liftgate chatters when raising or lowering
Cause Correction
a. Inadequate lubrication
between sliders and
rails
The rails should be lubricated on a regular basis. See Owner’s Manual for the
type and frequency of lubrication and the locations for lubricating. Lubricate
each frame rail on 4 surfaces where slider wear pads or rollers make contact
over the entire length of each rail. DO NOT USE GREASE!
b. Rail wear surfaces are
dirty & contaminated
If lubrication of the rails does not eliminate the chattering it may be
necessary to completely clean the rails, slider wear pads, and rollers.
The sliders should be removed from the rails to thoroughly clean the rails,
slider wear pads and rollers. All contaminants must be removed from the
rail including grease, rust, paint overspray, etc., such that only bare metal
remains. Lubricate the pads and rails before reassembly. See step C.
c. Wear pads are worn
down or embedded
with contaminants
If the wear pads are worn down to the mounting screw heads or if they are
embedded with contaminants (rust, road debris, paint overspray, etc.), it
will be necessary to replace them at this time.
d. Wear pad mounting
screws are loose
The wear pads at the top of the sliders are secured using screws and
center detent locknuts. Retighten locknuts or replace hardware if locknuts
are no longer tight (locking) on screws. The lower wear pads below the
rollers, use self-tapping screws. Apply a thread locker loctite to the threads
of the screws and tighten.
e. Slider rollers are not
turning freely
Make sure all slider rollers can be rotated by hand fairly easily. If a liftgate
is older, the rollers may not spin like they are brand new, but they should
turn fairly easily by hand. If a roller will not turn by hand, look for flat spots
on the rollers or skid marks in the rails, which would further indicate the
rollers are not turning freely. Replace any roller that does not turn freely.
f. Platform chains are
not in equal tension
Adjust the platform support chains so they are in equal tension.
If you have any questions or problems that are not covered in this guide please call Thieman’s
Engineering Department at 1 800-524-5210.
MP110599 • 1.5M • 6/22