Lippert Components Curt Rota-Flex Pin Box User manual

Rota-Flex™
Pin Box
OWNER'S MANUAL

Rev: 08.09.23 Page 2 CCD-0008113
TABLE OF CONTENTS
Introduction 2
Safety 2
Operation 3
Hitching Procedure 3
Pull Test 4
Troubleshooting 5
Maintenance 5
The "WARNING" symbol above is a sign that a procedure has a safety risk involved and may cause
death or serious personal injury if not performed safely and within the parameters set forth in
this manual.
Failure to follow instructions provided in this manual may result in death, serious personal injury
and/or severe product and property damage, including voiding of the component warranty.
The “CAUTION” symbol above is a sign that a safety risk is involved and may cause personal injury
and/or product or property damage if not safely adhered to and within the parameters set forth
in this manual.
Safety
Read and understand all instructions before installing or operating this product. Adhere to all safety labels.
This manual provides general instructions. Many variables can change the circumstances of the instructions,
i.e., the degree of difficulty, operation and ability of the individual performing the instructions. This
manual cannot begin to plot out instructions for every possibility, but provides the general instructions,
as necessary, for effectively interfacing with the device, product or system. Failure to correctly follow the
provided instructions may result in death, serious personal injury, severe product and/or property damage,
including voiding of the Lippert limited warranty.
Introduction
This document provides operation information for the Curt® Rota-Flex™ Pin Box.
Additional information about this product can be obtained from lippert.com/support or by downloading
the free LippertNOW app. The app is available on Apple App Store® for iPhone® and iPad® and also on
Google Play™ for Android™ users.
Apple App Store®, iPhone®, and iPad® are registered trademarks of Apple Inc. Google Play™ and Android™
are trademarks of Google Inc.
NOTE: Images used in this document are for reference only when assembling, installing and/or operating
this product. Actual appearance of provided and/or purchased parts and assemblies may differ.
Always wear eye protection when performing service, maintenance or installation procedures.
Other safety equipment to consider would be hearing protection, gloves and possibly a full face
shield, depending on the nature of the task.

Rev: 08.09.23 Page 3 CCD-0008113
Operation
Hitching Procedure
Failure to follow these instructions may result in death or serious injury.
Working between the tow vehicle and trailer can be dangerous. Failure to properly secure the
tow vehicle and trailer from movement can result in serious personal injury or death and serious
product damage. Make sure tow vehicle and trailer are secured from movement. Make sure all
safety precautions are followed to prevent personal injury or product damage.
1. Place chocks firmly against the front and rear of each trailer wheel to prevent possible movement
either forward or backward.
2. If necessary, lower the tow vehicle’s tailgate.
NOTE: Clearance of the lowered tailgate to the trailer needs to be monitored during hookups, since some
combinations of tow vehicle and trailer have little or no clearance.
3. Using the trailer landing gear, adjust trailer height per the manufacturer’s recommendation so the
bottom of the trailer’s pin box (Fig. 1B) is 1/2” to 1” below the top portion hitch skid plate (Fig. 1A).
Fig. 1
A
B
Do not attempt to hitch the trailer by using trailer jacks to lower the trailer and kingpin onto the
hitch opening. This could result in the kingpin coming to rest on top of the skid plate instead of
within the hitch opening, which may result in death or serious injury.

Rev: 08.09.23 Page 4 CCD-0008113
NOTE: During the hitching maneuver, the bottom of the trailer’s pin box should come into contact with
the hitch skid plate ramp.
4. Open the jaw on the 5th wheel head. Refer to the manufacturer’s instructions for proper 5th wheel
hitch latch operation.
5. Back the tow vehicle slowly toward the trailer until the tow vehicle’s hitch contacts the bottom of the
pin box and the kingpin slides into the receiver.
6. Latch 5th wheel hitch in closed position per the instructions of the 5th wheel hitch manufacturer.
7. With the trailer wheels still chocked, make sure:
A. The landing gear is resting on firm, level ground.
B. The landing gear fully supports the trailer’s weight.
C. The tow vehicle is stationary and in park with the emergency brake on.
D. The bottom of the pin box is resting on top of the hitch.
E. There is no space between the mating surfaces.
8. If space exists between the pin box and hitch, the trailer has not been properly hitched. Do not tow the
trailer. Instead, repeat the hitching steps 1-7 until the trailer is properly hitched.
9. Connect any electrical cables between the tow vehicle and trailer.
10. Do not tow the trailer until a Pull Test has been conducted. Go to the Pull Test section in the manual.
Pull Test
Failure to perform a pull test may result in severe property damage, serious personal injury or
death. Failure to secure tow vehicle and trailer from movement during procedure could result in
severe property damage, serious personal injury or death. Make sure tow vehicle and trailer are
properly secured against movement during the procedure.
1. Make sure the trailer wheels are chocked, the trailer landing gear is resting on firm ground to support
the trailer and the tow vehicle is in park with the emergency brake engaged. Double check tailgate
is lowered.
2. Return to the cab of the tow vehicle, release the emergency brake and then apply the trailer brakes.
3. Slowly pull the trailer forward with the tow vehicle.
A. If the tow vehicle is properly hitched, the wheel chocks and trailer brakes should keep the truck
from moving forward.
B. If the trailer is not properly hitched, the trailer will separate from the hitch and the truck will move
forward while leaving the trailer behind. If this happens, repeat the Hitching Procedure.
4. After successfully performing the Pull Test, fully raise the landing gear per manufacturer’s
recommendations.
5. Raise the tailgate of the truck.
6. Check and inspect all electrical circuits for proper operation, including clearance lights, turn signals
and stop lights.
7. Remove and store all trailer wheel chocks.
Review hitch manufacturer recommendations for Pull Test prior to proceeding and adjust accordingly.

Rev: 08.09.23 Page 5 CCD-0008113
Troubleshooting
What is happening? What should be done?
Trailer not level. Adjust pin box or hitch accordingly.
Excessive bottoming of skid pad assembly.
Chucking in tow vehicle.
Inspect the rubber compression bumpers to ensure they are
in place. Check trailer brakes for proper operation. If above is
satisfactory, it may be necessary to install a shear spring with
a different spring rate.
Skid pad assembly does not return to
neutral position when disconnected from
tow vehicle.
Check for loose or torn rubber shear spring.
Excessive noise from pin box area. Verify that the pin box is securely attached to the 5th wheel.
If the kingpin is excessively worn, the skid pad will need to
be replaced. Hitch mechanisms can also cause noise. Verify
that unwanted noise is not coming from the hitch. The hitch
manufacturer can provide guidelines for this check.
Maintenance
• Inspect kingpin for excessive wear (annually).
• Inspect the skid pad to ensure a neutral (centered) position. When the trailer is disconnected from the tow
vehicle, an equal gap of approximately 1 - ¼” should be observed between the lip of the skid pad and the
rubber compression bumpers. It is normal to be able to slightly move and twist the skid pad assembly with
hand force.
• Inspect the retainment rods for excessive wear. The retainment rods may show surface scratch marks as an
indication of occasional contact, but the scratches, if present, should be minimal.
• Inspect the plastic glide pads for excessive wear. The glide pad thickness should be no less than ¾”.
• Periodically check the torque values of all bolts.
• Check bearing and grease once per season. If more grease is needed, add it to the bearing assembly. Use
any of the recommended brands in the chart below.
Do not mix lithium, calcium, sodium or barium complex greases. Mixing these incompatible
compounds can create a corrosive and/or toxic chemical with fumes that can result in a serious
health risk if exposed to skin or lungs. When converting from one grease to another, make sure all
old grease is removed completely prior to applying new grease.
Approved Sources - Bearing Grease
Mobil Oil Mobilgrease HP
Exxon/Standard Ronex MP
Kendall Refining Co. Kendall L-427
Ashland Oil Co. Valvoline Val-plex EP Grease
Pennzoil Prod. Co. Premium Wheel Bearing Grease 707L

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dissemination of portions of this manual unless prior written consent from an authorized Lippert representative
has been provided. Any unauthorized use shall void any applicable warranty. The information contained in this
manual is subject to change without notice and at the sole discretion of Lippert. Revised editions are available
for free download from lippert.com.
Please recycle all obsolete materials.
For all concerns or questions, please contact Lippert
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