Description

Fontaine Ultra LT 2010 Service Manual – OEM Factory Repair Procedures

If you’ve got a Fontaine Ultra LT fifth wheel in your shop and you’re chasing a uncoupling issue or a slide that won’t budge, the Fontaine Ultra LT 2010 Service Manual is what you need. This is the factory document, 24 pages of specs and procedures that came from Fontaine, not some third-party rehash. I’ve seen too many guys guess at torque values or skip pre-service steps and end up with a cracked bracket. That’s money down the drain. This manual gives you the exact part number nomenclature from page 2 and the rebuild sequence from page 16. You want to do this right? You start here.

Identify Your Fifth Wheel: Model Decoding on Page 2

Page 2 breaks down how to read the model number. Example: SL4LWO675012 – that tells you it’s a side left, Ultra LT Series, outboard slide bracket, 6-3/4″ height, 12″ slide. If you don’t know what you’re working on, you can’t order the right parts. The manual also lists serial number locations and duty class restrictions. Standard duty is 100% on-highway with less than 95,000 lbs GCW. Use this fifth wheel in moderate duty without checking – you void the warranty.

Slides and Brackets: What the Factory Specs Say

The slides and brackets section (pages 4-5) covers inboard and outboard configurations. Note that inboard models were pending future release as of 2010. If you’re retrofitting, check the bracket type: LWO, APB, SMB, A36. The manual includes the air cylinder placement on slide assemblies. Don’t assume all slide brackets are the same. For similar specifications on other equipment, check out the White Outdoor LT-5 700 Series 2005 Service Manual – OEM Factory Specs.

Know your bracket type before ordering parts.

Pre-Service Procedures: Why You Need the Torque Specs

Pages 6-8 are the pre-service procedures. This isn’t a suggestion – it’s the order of operations. You need to inspect the fifth wheel for wear, check the mounting bolts, and verify the air system pressure. Missing a step here can cause the fifth wheel to separate during operation. The manual doesn’t give specific torque values in this section? [DATA NEEDED] but the overall procedure is clear. For torque values, you’d refer to the assembly section on page 21. I’ve seen techs skip the pressure check because they thought it was fine, only to have the slide cylinder fail under load. That’s a lawsuit waiting to happen. The manual explicitly says to verify air pressure with a gauge before any uncoupling or coupling procedures. That’s not optional.

3 Critical Sections for Safety

First: the uncoupling design on pages 11-12. Understand how the release mechanism works – fabricated pull handle vs. air actuated. Second: troubleshooting on pages 13-15. Five pages of common faults and solutions. Third: rebuild on pages 16-18. Complete disassembly and assembly instructions. If you skip the uncoupling design section, you might not correctly diagnose a lockout. That’s a safety hazard.

Troubleshooting Section: Page 13-15

When a driver complains that the fifth wheel won’t lock or slides are sticking, go straight to troubleshooting. Page 13 walks you through symptoms – no air pressure, worn release handle, damaged slide rail. Each symptom has a cause and fix. This is the part of the manual that saves you from tearing down the whole assembly when it’s a simple air line obstruction. If you’re working on Japanese trucks, the Maruti MB308 Service Manual – OEM Factory Specs for Proper Repairs might be relevant. For hydraulic hammer repairs, the Huskie HH100, HH150-2, HH300-2, HH500-2, HH750-2 Service Manual OEM Specs is a good reference.

Who Needs This Manual?

If you’re a shop owner or a mobile tech who services heavy trucks, this is for you. DIYers with a fifth wheel trailer might find it useful, but the real value is for professionals who need factory specs to avoid liability. The manual assumes you have tools like a torque wrench (ft-lbs), puller, and air pressure gauge. No shortcuts.

OEM vs Aftermarket – Why It Matters

Aftermarket manuals might have generic diagrams that don’t match your Ultra LT. This is the genuine Fontaine publication – LT-156 August 2010. The part number nomenclature on page 3 is exact. The serial number engraving location is described. You can’t get that from a Chilton’s. If you’re using aftermarket, you’re rolling the dice. The fifth wheel uncoupling design is similar to that in a Manual Transmission in terms of mechanical linkage. For understanding gear ratios, refer to Manual Transmission documentation.

FAQ

Does this manual cover the hydraulic system?

No. The Ultra LT is a fifth wheel, not a hydraulic unit. No hydraulic coverage.

What torque values are specified?

The manual does list torque values in the assembly section on page 21. However, the PDF excerpt doesn’t include those numbers. You need the full manual to see them. The pre-service section references bolt checks but not specific ft-lbs.

Can I use this manual for a different year model?

This manual is specifically for the 2010 Ultra LT. Fontaine made changes to the slide bracket designs and part numbering after that year. Using it for a 2012 model could lead to wrong identification of the top plate or bracket type. The duty class restrictions also changed slightly. However, if you have a 2009 or 2011 Ultra LT, some mechanical components are similar. But I’d recommend finding the correct year manual to avoid mistakes. The 24 pages are tailored to the 2010 production run.

Is this a PDF or a physical book?

It’s a digital PDF format. 24 pages, searchable. You can print the sections you need.

If you need to rebuild a Fontaine Ultra LT or just want the correct specs on your workbench, access the Factory Manual now.