Mack MaxLite 40EZ (2006+) Air Rear Suspensions Z Springs & Radius Leaves
This model uses through-bolt radius leaf bushings.
This suspension is also used on Volvo.
Z springs and radius leaf on rear drive axle may differ than those used on front drive axle. High driveline angle rear drive axle uses different Z springs and radius leaf than front drive axle. See illustration for more details. Verify by OEM number stamped on Z spring on hook or on radius leaf on eye.
Radius leaf locating pin design changed during 2015. Refer to illustration above. Old radius leaves (with dowel) and new radius leaves (with pin) are interchangeable. The hole size in the old and new designs are different, therefore the old design dowel and new design pin are not interchangeable.
| SRI |
OEM Volvo, Mack |
A Front |
B Rear |
Capacity per axle |
Remarks |
| 96-1317 |
20518753, 4QK5128M |
23 5/8" | 19 1/4" | 19-20,000 lb | Single axle, Front tandem axle, Low angle rear tandem axle (Z Spring) |
| 96-1319 | 20518808, 4QK5129M | 25" | 20 3/4" | 19-20,000 lb | High angle rear tandem axle (Z Spring) |
| 96-1335 | 20779355 | 23 5/8" | 19 1/4" | 23,000 lb | Single axle, Front tandem axle, Low angle rear tandem axle (Z Spring) |
| 96-1347 | 20779356 | 25" | 20 3/4" | 23,000 lb | High angle rear tandem axle (Z Spring) |
| SRI |
OEM Volvo, Mack |
F | G | Remarks | |
| 96-1321 | 20518814, 4QK4208M | 3 3/4" | 23 1/8" | Radius Leaf | Single axle, Front tandem axle, Low angle rear tandem axle; Dowel locator |
| 96-1323 | 20521246, 4QK4209M | 3 5/8" | 24 9/16" | Radius Leaf | High angle rear tandem axle; Dowel locator |
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