Solution for Rota-Flex Pin Box Where Cushion Wants to Slide Out

Question:

We have a 2017 grand design solitude, it has a lippert 1621 trailair pin box. The rubber “cushion” came out between the kingpin and frame. I disassembled and re assembled, but it’s coming out again. Can I replace the rubber? Should I replace it? Should I get a different pin box?

asked by: Matt B

Expert Reply:

I can tell you the procedure for replacing the jounce stops on the Rota-Flex pin box like you have though the exact replacement parts are not available since this pin box was phased out. They are a rubber compound but the specifics of it I do not know.

Ideally you replace the pin box with the Flex Air part # LC328492 which fits as an exact replacement for what you have and will give you the new and improved version of your current pin box without the issues.

1. With Long Needle-nose pliers, from the back of the pinbox, squeeze tag ends of Cotter Pin together and push it out of the Front Jounce Stop and it’s channel. Cotter Pin may need to be pulled out from the front of the pinbox to completely remove it from the Jounce Stop.
2. Repeat to remove second Cotter Pin.
3. Tap out Jounce Stop from its Channel.
4. From the front of the pinbox, repeat the procedure to remove Rear Jounce Stop Block.
5. Replace old Front Jounce Stop with new Jounce Stop.
6. Lubricate the Jounce Stop with Silicon spray and align holes in the new Jounce Stop to the holes in the Channel.
7. Tap new Jounce Stop in place with a dead blow hammer.
8. Replace Cotter Pins.
9. Remember to flare the tag ends of the Cotter Pins away from each other to hold Jounce Stop securely.
10. Repeat procedure to replace the Rear Jounce Stop.