International — Corporate Air/IROS

Description

International Ride-Optimized Suspension. This suspension is similar in concept to the Freightliner FAS II and Peterbilt’s New Low Air Leaf. The biggest maintenance concern is the bonded bushing in the spring eye. Commonly, it will open up and the bushing can walk out.

International Corporate Air/IROS

Fast Facts

International — Corporate Air/IROS
Type
Features
Problem Areas	The biggest maintenance concern is the bonded bushing in the spring eye. Commonly, it will open up and the bushing can walk out.
ATRO Solutions

Tech Tips and Additional Resources

With a bonded OE-style rubber bushing, the entire bushing can be forced to spin within the spring eye causing it to expand. Bonded rubber bushings attempt to combat this with an inboard flanged end encased in a ring with detents for gripping the edge of the spring’s eye.

ATRO spring pin solution (PB46-26268; UB20500-OS):

Rotating pin design with flanged outer sleeve limits travel
The revolving inner pin eliminates bushing wind-up and prevents entire bushing spinning
UB20500-OS, an over-sized version (+.060”), is available if the rubber bushing has opened up the spring eye slightly. The spring must still meet specifications. If not, the spring must be replaced, not rebushed.

ATRO torque rod:

The OE offers multiple torque rod options on this suspension. That standard rod can be replaced by ATRO’s TR55-418C1 – other OE options include non-rebushable rods, those with 2 17/32" outer diameters (rebushed by ATRO’s TS34000), or even tubular rods with jam bushings rebushed by ATRO’s TS50-22691 or PL1146.
Inner pin in both the standard rod (TR55-418C1) and the small eye rod (TR55-428C1) rotates for installation – enabling easy alignment with bolt holes in the straddle bushings configuration.
Rebushable (both the standard rod and the small eye rod.)