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5. OPTIONAL: Place a 5/16" pin or lock in hole shown
To Uncouple:
1. Block trailer wheels.
2. Open locking lever. While holding locking lever fully
open, raise trailer off of hitch ball.
NOTE: A 5/16" diameter pin can be used to hold the
locking lever open.
Hitch Coupler Troubleshooting
If the coupler becomes damaged it must be repaired or
replaced before towing. When the coupler is placed on
the ball, the latch should close firmly. Keep the latch
mechanism lightly oiled and clean. Items to check for
are as follows:
1. Latch does not grasp ball securely:
•
Check the ball size. Make sure the ball and
coupler are the same size.
2. Latch does not snap into full latch position:
•
Check adjustment. Latch mechanism may be
too tight.
•
Check to see that the coupler housing has not
been damaged, keeping the ball hitch from
fitting completely into the housing as designed.
3. Keep the tongue blocked up when not in use so the
coupler and mechanism are not in the ground
being exposed to dirt and moisture.
4. Apply a small amount of an automotive grease to
the ball before hitching coupler to prevent wear of
the two parts during towing.
5. Make sure the latch safety pin is in position before
towing.
Coupler & Ball Engagement
If the coupler and towing ball resist attempts to make
engagement, do not force latch assembly. Instead,
check the ball diameter to verify that it conforms to
Society of Automotive Engineers (SAE) specifications.
Standard two-inch diameter ball should be within the
limits of 2.000-inches to 1.970-inches. Balls larger than
2.000- inches will not readily fit the coupler. A two-piece
coupler ball is not recommended.
If the coupler becomes damaged it must be repaired or
replaced before towing. When the coupler is placed on
the ball, the latch should close firmly. Keep the latch
mechanism lightly oiled and clean. Improper engage-
ment of the coupler and ball can cause damage if the
vehicles separate in transit, thus, caution must be
Landa TRV-3500 Service Manual 8.917-470.0 - R
Important Trailer Safety Information
exercised to insure a secure hook-up. Lower the
coupler onto the ball with the coupler latch in the
vertical position. Continue to lower the trailer tongue
until the jack clears the ground, then flip the coupler
latch to its locked (horizontal) position. At this point
visually observe that the ball is fully engaged in the ball
hitch. An even better check to make sure the two are
fully engaged is to raise the tongue of the trailer again
using the jack. Raise until the ball hitch connection
starts to raise the rear of the tow vehicle. If the connec-
tion was not properly made, the ball and socket will
separate as the tongue of the trailer is raised.
Safety Chains
Listed in the chart below are the different class sizes of
safety chains and the rated load each chain must be
capable of withstanding. Your trailer is equipped with
safety chains that meet the requirements of D.O.T
Regulation 393.70.
Trailer
Trailer Weight
Class
GVWR In Lbs.
I
to 2,000
II
2,000 to 3,500
III
3,500 to 5,000
IV
5,000 to 7,000
WARNING: Failure to properly attach safety chains
between the trailer and tow vehicle can result in a
runaway trailer.
WARNING: To avoid accidents, before trailering:
•
Hitch only to ball size marked on coupling.
•
Ball clamp must capture ball and lever or hand
wheel is fully clamped.
•
Cross safety chains under coupling.
•
Allow only enough slack for turns.
Bottom View
Minimum Braking
Strength In Lbs.
2,000
3,500
5,000
7,600
7
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