4. Problem - Oil or foamy oil/air mixture flowing from reservoir breather
Cause
a . Air is present in the
system
b . Flow control is on
backwards, gate lowers
too fast
c . Inoperable flow control,
gate lowers too fast
d . Motor is not running while
lowering the gate
e . Reservoir was overfilled or
filled with liftgate in wrong
position .
Correction
This can occur if the motor is not running as the liftgate is lowered . See
Problem 1, part f and g . Also air can enter the system if the fluid level is low,
see Problem 2, part a, or if the suction tube is disconnected, see problem 2,
part j . Also air may enter through fittings, which are not tightened properly,
so check for any leaks around fittings or hoses . Once the source of the air
is determined, the cylinders must be bled of all air . Most air can be removed
from the system by lowering the gate to the ground to relieve all pressure from
the cylinders, unpinning the cylinders and cycling them back and forth several
times from fully extended to fully retracted and allowing the pump to bypass
through the relief valves for a few seconds in each direction .
The flow control provided is rated at 1 .0 GPM . The arrow on the flow control
must point away from the cylinder, designating the direction of the controlled
flow . Flow controls larger than 1 .0 GPM or improper arrow orientation, will
cause the gate to lower too quickly (9 sec min – max load from 56” bed
height) . Correct as needed .
Inoperable flow controls can cause the gate to lower too quickly . Remove and
disassemble the flow control and check for excessive wear and contamination .
Clean as needed and reassemble . Replace the flow control if necessary .
This liftgate is a power down liftgate, which means the pump should push the
liftgate down . If the pump motor does not run while lowering, fluid is coming in
the reservoir from the rod end of the cylinders and not getting pumped back
out to the butt end of the cylinders . This will cause the pump reservoir to
overflow with oil . See Problem 1 .
See the MONTHLY INSPECTION AND MAINTENANCE in the “Maintenance
Guide” section of this manual to find out what position the liftgate should be in
when checking the reservoir level and how full the reservoir should be in that
position .
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
5. Problem - Platform difficult to unfold to horizontal position, after lowering gate from stored position
OR platform hard to fold up from horizontal position.
Cause
a . Kicker chain is not
adjusted properly
b . Platform pivot pins are
seizing up in platform
pivots
c . Worn out platform
springs or springs which
are not properly
lubricated
Correction
The kicker chains should be adjusted properly as part of the standard LRST40
installation procedure . If this was not done properly or if the kicker chain was
replaced, the kicker chain may need adjusting . A properly adjusted kicker chain
will make the platform easier to unfold to the horizontal position . Refer to the
"LRST40 Kicker Chain Adjustments" near the end of the standard "LRST-40
Installation Instructions" manual . For the latest copy of the "LRST-40 Installation
Instructions" manual, visit www .thiemantailgates .com or contact the factory .
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 pivot pins turn freely in the platform pivots, but the platform is
still hard to fold from the horizontal to vertical position, one or both of the coiled
torsion springs on the platform may be weak or broken . Replace any springs
which are broken or which are permanently deformed and do not return to the
same position as a new spring . Alternately, the springs on the platform may need
lubrication . Under the "Maintenance Guide" section of this manual, there are
instructions for periodic lubrication, which includes lubrication across the coils of
the platform springs . This allows the coils to slide past each other as the torsion
spring is loaded and the coils rotate . Springs that are not lubricated, can make the
platform harder to fold .
23 .
Summary of Contents for LRST-40
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