Fontaine Ultra LT series User manual

Fontaine Fifth Wheel
Ultra LT
Service Manual
Fontaine Fifth Wheel • 7574 Commerce Circle • Trussville, AL 35173
©2010 • LT-156 August 2010
www.fthwheel.com • 800-874-9780
FONTAINE
FIFTH WHEEL®

800-874-9780 • www.fifthwheel.com
FONTAI NE
FIFTH WHEEL®
FONTAI NE
FIFTH WHEEL®
2
800-874-9780 • www.fifthwheel.com
Ultra LTUltra LT
Identify fifth wheel assembly
Identify top plate
Identify slides and brackets (Note: see Slides and Bracket section for more information)
Ultra LT Series
Inboard
Adjustable plate mount
Outboard
Contents
Identify your fifth wheel ....................................... 2-3
Slides and brackets ............................................. 4-5
Pre-service procedures........................................ 6-8
Preventive maintenance..................................... 9-10
Uncoupling design ........................................... 11-12
Troubleshooting ............................................... 13-15
Rebuild ............................................................ 16-18
Disassembly .................................................... 19-20
Assembly......................................................... 21-22
Inboard models
will be available
in the future
Indentifying features:
•Fabricatedpullhandle
•Slideassemblieshavecenter-
mounted air cylinders
•Nametagslocatedonfrontskirt

800-874-9780 • www.fifthwheel.com
FONTAI NE
FIFTH WHEEL®
FONTAI NE
FIFTH WHEEL®
800-874-9780 • www.fifthwheel.com 3
Identify your fifth wheel
SL 4 LWO 6750 12
Release Top plate model Mounting bracket Mounting height Slide travel
1. Top plate 2. Mounting bracket 3. Slide rail
Fontaine Fifth Wheel complete assembly part numbers. Example: SL4LWO675012
SL = Side left
SR = Side right
AA = Air actuated
4 = Ultra LT Series Actual height from truck
frame to top of fifth wheel.
Examples: 6750 = 6-3/4"
7750 = 7-3/4"
8750 = 8-3/4"
For sliding fifth wheels only.
Example: 12 = 12" slide
24 = 24" slide
36 = 36" slide
48 = 48" slide
LWO = Outboard slide bracket
APB = Adjustable plate bracket
Pending release:
LWI = Inboard slide bracket
SMB = Stationary bracket mount
A36 = Angle mount
Serial number locations
Part number nomenclature
Duty class restrictions
Serial number engraved directly into the right of fifth wheel skirt.
Note: position 5 and 6 of the serial number indicates the year built.
Application/restriction levels
Standard duty: Fifth Wheel must be used in a 100% on-highway
application, with more than 30 miles between each stop. The
total number of towed axles equals two (2). Road type must be
maintained concrete or asphalt. Gross Combination Weight (GCW)
is less than 95,000 lbs or 43,000 kgs. See Fontaine Application
Guide LT-076 for specific application recommendations. Product
used in unapproved applications voids manufacture warranty.
Moderate duty: Fifth Wheel must be used in a less than 10%
off-highway application, with no minimum mileage between each
stop. The maximum total number of towed axles equals four (4).
Road type must be maintained concrete, asphalt, gravel, or crushed
rock. Gross Combination Weight (GCW) is less than 115,000 lbs
or 52,000 kgs. See Fontaine Application Guide LT-076 for specific
application recommendations. Product used in unapproved
applications voids manufacture warranty.
Severe duty: Fifth Wheel can be used in any off-highway
application, with no minimum mileage between each stop. The
total number of towed axles equals five (5) or more. All road types
are acceptable including hard packed dirt and non-maintained
roads. Gross Combination Weight (GCW) is more than 115,000 lbs
or 52,000 kgs. See Fontaine Application Guide LT-076 for specific
application recommendations. Product used in unapproved
applications voids manufacture warranty.
Important application notes:
1. If any single restriction factor within your application
is surpassed within a given duty level, the next duty
level must be selected.
2. When selecting a fifth wheel, if the application or
vehicle usage places the maximum capacity on a
certain fifth wheel, then the selection of a fifth wheel
with a higher capacity is advised. For example, a
tractor that is at a maximum vertical load of 50,000
lbs in a moderate duty application should be using a
fifth wheel with a vertical load capacity of 55,000 lbs
or greater. This additional capacity should give better
service life over a longer period of time.
3. All logging, mining, oil field and similar applications
are considered severe duty. Do not select assemblies
in the standard or moderate levels when a special
application is designated.

800-874-9780 • www.fifthwheel.com
FONTAI NE
FIFTH WHEEL®
FONTAI NE
FIFTH WHEEL®
4
800-874-9780 • www.fifthwheel.com
Item Description Part No. Quantity
1 Slide Rail * 1
2 Rear Slide Stop *
*
2
3 Slide Bracket 1
4 Bracket Bushing BSH-3000* 2
5 Air Cylinder * 1
6 Locking Wedge * 2
7 Hex Bolt, 3/8"-16 x 1.25" * 2
8 Spacer Bushing * 2
9 Lock Nut, 3/8"-16 * 2
10 Flat Washer, 1/2" * 2
11 Hex Head Bolt, 1/2"-13 x 1" * 2
1
2
2
3
4
4
5
6
6
7
7
8
8
9
9
10
11
10
11
Fontaine®Ultra LT Series Slides and Brackets
LWO: Outboard slide
• Up to 50 lbs lighter than competitive outboard
slide systems
• 4” slide increments give you slide versatility for
improved payload distribution
• Compact design with central mounted air cylinder
• Booted air cylinder provides protection to shaft
• Available in 6-3/4", 7-3/4", 8-3/4" and 9-3/4"
heights; 12”, 16", 24”, 36” and 48” slide travel
LWO parts list
Item
no. Description Part no. Qty.
1Slide rail –1
2Rear slide stop – 2
3Slide bracket –1
4Bracket bushing BSH-3000 2
5Air cylinder *1
6Locking wedge – 2
7Hex bolt, 3/8"-16 x 1-1/4", gr5 * 2
8Spacer bushing * 2
9Hex lock nut, 3/8"-16, gr5 * 2
10 Flat washer, 1/2" – 2
11 Hex head bolt, 1/2"-13 x 1" – 2
* Included in LWO/LWI air cylinder kit, part no.:
CYL-LWO-LWI
LWO weight chart
Slide
Length
Height
6-3/4" 7-3/4" 8-3/4" 9-3/4"
12" 356 lbs 361 lbs 367 lbs 373 lbs
16" 363 lbs 368 lbs 374 lbs 380 lbs
24" 376 lbs 381 lbs 387 lbs 393 lbs
36" 396 lbs 401 lbs 407 lbs 413 lbs
48" 416 lbs 421 lbs 427 lbs 433 lbs
Add 5 lbs for air actuation

800-874-9780 • www.fifthwheel.com
FONTAI NE
FIFTH WHEEL®
FONTAI NE
FIFTH WHEEL®
800-874-9780 • www.fifthwheel.com 5
Fontaine®Ultra LT Series Slides and Brackets
APB: Adustable plate mount
• LT top plate with the ABP bracket is the lightest
mounting system available for the LT family
• Manufactured with the durability and cost-
effectiveness of steel construction
• Brackets are welded to a 3/8" steel plate with
six 5/8" bolt holes on each side for mounting
versatility
• Plate has different cut out and different locations
for rear rocker limit blocks
• Available in 6-1/4", 7-1/4", 8-1/4" and 9-1/4"
heights
LWO weight chart
Slide
Length
Height
6-3/4" 7-3/4" 8-3/4" 9-3/4"
12" 356 lbs 361 lbs 367 lbs 373 lbs
16" 363 lbs 368 lbs 374 lbs 380 lbs
24" 376 lbs 381 lbs 387 lbs 393 lbs
36" 396 lbs 401 lbs 407 lbs 413 lbs
48" 416 lbs 421 lbs 427 lbs 433 lbs
Add 5 lbs for air actuation
APB weight chart
Height
6-1/4" 7-1/4" 8-1/4" 9-1/4"
281 lbs 286 lbs 291 lbs 297 lbs