2-MACK_FXL_18_FRT_AXLE.pdf
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- Competitive Selection OH|DOT04426-5
- Contract number
- DOT04426-5
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- Ohio
About this file
This document is a Sales Engineering Publication from Mack Trucks, Inc., located in Allentown, Pennsylvania, detailing the technical specifications for the FXL18 Front Axle, designed for heavy-duty truck applications. The publication provides comprehensive technical details about a front axle rated at 18,000 lbs [8,165 kg], with specific focus on its structural and mechanical characteristics.
The document describes the front axle's key components, including a Reverse Elliot, Drop-Forged & Heat Treated I-Beam with a 4.75" center height, a steering knuckle made of Chromium Molybdenum Alloy Steel, and tapered roller bearings. The axle features unitized wheel hubs that are permanently sealed with grease, sealed tapered kingpins, and a forged I-Beam construction. The specification tables outline brake specifications using Arvin Meritor components with air actuation and various suspension spring configurations for different chassis models (GU and MRU), offering both standard and heavy-duty options with multiple leaf spring arrangements.
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DETAIL SPECIFICATIONS
MAKE: MACK
Type . . . . . . . . . . . . . Reverse Elliot, Drop-Forged
& Heat Treated I-Beam Size (Beam Center Height) . . . . . 4.75" [121 mm] Flange Width . . . . . 3.50" [89 mm] Top & Bottom Web Thickness . . . . . . . . . . . . . . . 0.75" [19 mm] Section Modulus . . . . . . . . . . . 9.90" in3 [172 cm3]
STEERING KNUCKLE:
Material . . . . . . . . . . . . . Chromium Molybdenum
Alloy Steel, Heat Treated Spindle Diameter
Inner Bearing . . . . . . . . . . . . . . 2.68" [68 mm] Outer Bearing . . . . . . . . . . . . . . 2.68" [68 mm]
Steering Knuckle Pin:
Material . . . . . . . . . Modified Carbon Steel, Heat
Treated & Induction Hardened Type . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Tapered Diameter
Top . . . . . . . . . . . . . . . . . . . . . . 1.57" [40 mm] Bottom . . . . . . . . . . . . . . . . . . . 2.36" [60 mm]
Mack Trucks, Inc., Allentown, Pennsylvania
FXL18
18,000 LBS. [8 165 kg]
STEERING KNUCKLE: (Continued)
Inclination . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6° Knuckle Pin Support
Upper . . . . . . . . . . . . . .Tapered Roller Bearing Lower . . . . . . . . . . . . . . . . . . Grooved Bushing
Thrust Bearing Type . . . . . . . . . . . . . . Tapered Roller Bearing
Location . . . . . . . . . . . . . . . . . Top of Knuckle Pin Hub . . . . . . . . . . . . . . . . . . . . . . . . . . Ductile Iron Bearings . . . . . . . . . . . . Tapered Roller (Unitized) Lubrication . . . . . . . . . . . . . . . Permanently lubed with Synthetic Grease
Pivot Centers:
FXL18 . . . . . . . . . . . . . . . . .69.92" [1 776 mm]
Spring Centers . . . . . . . . . . 33.5" [851 mm] MRU 32.5" [826 mm] GU
NOTE: FXL used with wide base type tires will exceed 96" [2 438 mm] overall width.
• Unitized wheel hubs—requires no maintenance—permanently sealed with grease.
• Sealed tapered kingpins and bearings keep out road splash, extend axle life and lower maintenance.
• Forged I-Beam construction, strong and lightweight.
FRONT AXLE
©2007 Mack Trucks, Inc. FRO029 240 1500 2/26/2007 Printed in U.S.A.
A SALES ENGINEERING PUBLICATION
The information in this brochure was accurate as known as of the date of the publication. Illustrations may not be representative of current product. Mack Trucks, Inc. reserves the right to make changes in specifications, equipment or design, or to discontinue models or options without notice at any time.
FXL18
18,000 LBS. [8 165 kg]
BRAKES
SUSPENSION
MULTILEAF EYE & SLIPPER
TAPERLEAF EYE & SLIPPERTAPERLEAF SHACKLE
MULTILEAF SHACKLE
SPRING CAPACITY
(GRD. LOAD RATING) SPRING SIZE
SPRING SIZE CHASSIS MODEL
APPLICATIONLENGTH WIDTH
18,000 lb.
[8 165 kg]
STD.
Taperleaf - Shackle 52.52" [1 334 mm] 4" [102 mm] GU
Multileaf - Shackle 52.52" [1 334 mm] 4" [102 mm] GU (OPT.)
Multileaf - Slipper 50.25" [1 276 mm] 3.5" [89 mm] MRU
18,000 lb.
[8 200 kg]
HEAVY DUTY
Taperleaf - Shackle 52.52" [1 334 mm] 4" [102 mm] GU
Taperleaf - Slipper 50.25" [1 276 mm] 3.5" [89 mm] MRU
Multileaf - Shackle 52.52" [1 334 mm] 4" [102 mm] GU
Multileaf - Slipper 50.25" [1 276 mm] 3.5" [89 mm] MRU
TYPE CAM
SIZE DIAMETER
WIDTH
16.5" [419 mm]
5" [127 mm]
MAKE Arvin Meritor
ACTUATION Air
LINING THICKNESS 0.85" [22 mm] Tapered
LINING AREA, TOTAL 376 in 2 [2 439 cm2]
CHAMBER SIZE—
Sq. In. Per Wheel
1 @ 24 [155 cm2]
SLACK ADJUSTER LENGTH 5.5" [140 mm]
BRAKE ADJUSTMENT Self-Adjusting
DUST SHIELDS Optional
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