# Service bulletin S7590

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 10198806
- Published by NHTSA: 2021\-07\-06
- Manufacturer's number: S7590
- Manufacturer's date: 2021\-06\-03
- NHTSA component: SUSPENSION

## NHTSA's summary

MMD \- Carrier Bearing Bolt Re\-Torque

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198806-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2021/MC-10198806-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Suspension

## Vehicles listed

- 2020 to 2021 MACK MD

## Other bulletins for the same vehicles and component

- [CBR\-2016 202412](/bulletins/11012156.md), 2025-01-02, Service bulletin: SUSPENSION. Frame lean can be caused by several seemingly isolated possibilities. The two most common are suspension and frame assembly issues.
- [CBR\-2342 202401](/bulletins/10249556.md), 2024-02-02, Service bulletin: SUSPENSION. CBR: Mack Medium Duty \(MMD\) Rear Suspension Bump Stop Bending
- [CBR\-2016 202401](/bulletins/10249551.md), 2024-02-02, Service bulletin: STRUCTURE; SUSPENSION. CBR: Frame Or Cab Lean
- [M728\-005A 202308](/bulletins/10241946.md), 2023-09-06, Service bulletin: SUSPENSION. TSB: Barksdale Leveling Valve, Leak Test
- [KC\-2170](/bulletins/10213640.md), 2022-06-07, Service bulletin: SUSPENSION. Electronically Controlled Suspension \(ECS\) Losing Air Pressure

JSON: [/v1/bulletins/10198806](/v1/bulletins/10198806)

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