Troubleshooting; Maintenance - Lippert Components Curt Rota-Flex Pin Box Owner's Manual

Troubleshooting

What is happening?
Trailer not level.
Excessive bottoming of skid pad assembly.
Chucking in tow vehicle.
Skid pad assembly does not return to
neutral position when disconnected from
tow vehicle.
Excessive noise from pin box area.

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
Mobil Oil
Exxon/Standard
Kendall Refining Co.
Ashland Oil Co.
Pennzoil Prod. Co.
Rev: 08.09.23
old grease is removed completely prior to applying new grease.
Approved Sources - Bearing Grease
What should be done?
Adjust pin box or hitch accordingly.
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.
Check for loose or torn rubber shear spring.
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.
Mobilgrease HP
Ronex MP
Kendall L-427
Valvoline Val-plex EP Grease
Premium Wheel Bearing Grease 707L
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