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Independent Rear Suspension

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Proven technology, front to back.

TAK-4® Independent Rear Suspension (IRS)

Improved ride. Less maintenance. TAK-4 IRS operates in a similar capacity to TAK-4 IFS, only IRS has the ability to drive or provide power to the wheels. Though there are upper and lower control arms and springs, TAK-4 IRS utilizes coil springs instead of torsion springs. IRS has been proven on Oshkosh Defense vehicles since 1996 and modified for integration into Pierce custom fire apparatus. TAK-4 IRS adds 1,000 lb per axle to the weight of the apparatus.

Benefits
• Improved ride with reduced road input.
• Increased stability & comfort.
• Less wear & tear on equipment.
• Better traction.
• Ability to add TAK-4 T3 to further improve control & mobility.

 

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TAK-4 IRS Components

IRS Components

Steering
TAK-4 IRS is equipped with steering toe links that provide toe adjustments and maintain wheel control throughout the entire range of wheel travel.

Control Arm
Cast steel alloy and ductile iron upper and lower control arms have integrated spring tower mounts.

Springs
Heavy-duty coil springs provide maximum travel over a variety of road conditions.

TAK-4 T3 IRS with Tight Turning Technology

100% mechanical rear steering. Maximized mobility.
TAK-4 T3 combines the advantages of TAK-4 IRS with a 100% mechanical rear steering system. Just like TAK-4 IFS, the steering system is a mechanical-over-hydraulic system – free of electronics – with two steering gears that provide power to the steering linkage. TAK-4 T3 is available for steering on one or two axles on tandems. 

Reduce wide swing turns with a tighter turning radius. Maneuver effortlessly – turn the wheel and you get response. Minimize tire scrub for improved tire life. TAK-4 T3 is available on 24K - 26K single axle and 36K - 52K tandem axle configurations that are equipped with TAK-4 IRS. 

Benefits
• Improved turning radius & turning diameter.
• Increased tire life with reduced tire scrub.
• Lane-to-lane turning.
• Improved maneuverability & safety.
• Pierce single-source manufacturing.

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TAK-4 IRS T3 Components

T3 Components

Steering
Mechanical-over-hydraulic steering system with two steering gears that provide power to the steering linkages.

Control Arm
Cast steel alloy and ductile iron upper and lower control arms have integrated spring tower mounts.

Springs
Heavy-duty coil springs provide maximum travel over a variety of road conditions.

Options Showcase