How to Install Replacement Air Bag in Trailair Air Ride

Question

Question:

Where can I get instructions to change out the damaged air springs on my pin box? I have received the new bags but no instructions to change out were provided.

asked by: Marvin S

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Expert Reply:

According to Lippert, here is how you will need to install your Replacement Air Spring for Trailair 5th Wheel Pin Boxes # LC432404:

"The bag is fastened at the bottom first by inserting the carriage bolt in the keyhole shape opening on the lower plate allowing the bolt head to slide in and be pulled forward securing the bag in place. Secure air bag with the air fill fitting in the up position with 2 locking nuts, not exceeding 20 ft/lbs - torque on the top plate of the air bag. Install air fitting using Teflon tape or pipe sealing compound. Install the shock absorber using the longer bolts with locking nut. Tighten nuts to 60 ft/lbs."

This air bag is a replacement for the following fifth-wheel pin boxes:

- Air Ride 5th Wheel Pin Box - Lippert 1621 & 1621HD - 21,000 lbs # LC158778
- Air Ride 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs # LC179879
- Flex Air 5th Wheel Pin Box - Lippert 0719 - 18,000 lbs # LC328484
- Flex Air 5th Wheel Pin Box - Lippert 1621 - 18,000 lbs # LC328492
- Flex Air 5th Wheel Pin Box - Lippert 1621 - 21,000 lbs # LC369535

expert reply by: Kyle S

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Answer 1

Hey Jonathon thank you so much for all of that additional information! To haul your bikes behind your class C Sprinter motorhome, while flat towing your Mini, I recommend the Hollywood Racks RV Rider Bike Rack item #HLY64FR and the Roadmaster Dual…

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Answer 2

Yes, it will work. You'll just need to cut the Lance 6-pin connector out and rewire it into the etrailer Trailer Wiring 7-Way Upgrade Kit w/ Junction Box and RV Style Connector item #e99011. Here are the individual functions of that Lance 6-pin:…

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Answer 3

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 4

Hey Fred! You will need to take some measurements to determine if you will have enough clearance with the B&W Gooseneck Pin Box #BW23RV. You can use the following formula: (A + B) - C = Clearance A = Distance from the gooseneck ball center to the…

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Answer 5

Yes, it is Mike. The Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box item #GY68GR is designed to fit a Lippert 1621/1621HD pin box. It has a 30,000 lbs towing capacity and a pin weight capacity range of 2,000 lbs - 4,500 lbs. This torsion pin box is…

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Answer 6

Hey Victor, yes the Long U-Bolt Kit part #RM33KT is a Roadmaster brand u-bolt kit. This does include nuts and washers as well.

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Answer 7

To determine if the MORryde Cushioned 5th Wheel Pin Box for 14K to 18K Trailers w/ Lippert 1621 and 1621HD #MR84VR will fit your trailer you'll need to first determine your trailer's bolt pattern. There will typically be a sticker (pictured…

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Answer 8

Hey Hadiya! No, the Curt E16 5th Wheel Hitch w/ S20 Slider for Ram #C85PV will not give you enough clearance to maneuver the Layton Skyline 5th wheel with your 2021 Ram 1500 with a 5-1/2' bed. This unit only moves you 12" back from the…

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Answer 9

Thanks for the question! I reached out to Westin to verify the mounting bracket dimensions for the Westin PRO TRAXX 4 #21-54130. They confirmed that the overall length of the mounting bracket is 12.23", so you can use that measurement to get an…

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Answer 10

I wish we could help. I know you've asked for dimensions a few times and I got you what I could from B and W but we are still 26 days away from getting more of these in stock to measure so there's not much I can do right now.

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Answer 11

Hey Gary! The Gen-Y Hitch Shock Absorbing 5th Wheel Pin Box #GY68GR will work with your Andersen hitch. However, I can't say for sure if you will still be able to jackknife your trailer. The Gen-Y Hitch Executive is roughly 2" shorter than…

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Answer 12

Congrats on the new motorhome Edward! SnapPad doesn't have the 2026 Allego Red 38 KA in their system so I don't know what size your jack feet are. However, we have a few options that will work with the HWH leveling systems. What you'll…

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How to Install Replacement Air Bag in Trailair Air Ride

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