TSB: MACK ASET, CH, CHK SERIES, CHU, CL, CLASS 6, CLASS 7, CLASS 8, CRD SERIES, CRD112/113, CRD200, CRD92/93, CS 300, CS 300P, CS SERIES, CV, CX, CXU, DM, DM SERIES, DM400, DM600, DM807, DM809, DM811, DMM SERIES, E6, E7, F SERIES, FDM, FREEDOM, GU, J-TECH, LE, LR, M35AK, M65BX, MACK, MB SERIES, MC400, MC600, MH, MIDLINER, MIDR, MR, MR SERIES, MR400, MR600, MS SERIES, MS200P, MS300, MS300P, R, RB, RD, RD SERIES, RM SERIES, RW SERIES, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WL, WS

Bulletin S7431 — November 1, 2019

Bulletin Details

Bulletin IDS7431
ManufacturerMACK
ModelsASET, CH, CHK SERIES, CHU, CL, CLASS 6, CLASS 7, CLASS 8, CRD SERIES, CRD112/113, CRD200, CRD92/93, CS 300, CS 300P, CS SERIES, CV, CX, CXU, DM, DM SERIES, DM400, DM600, DM807, DM809, DM811, DMM SERIES, E6, E7, F SERIES, FDM, FREEDOM, GU, J-TECH, LE, LR, M35AK, M65BX, MACK, MB SERIES, MC400, MC600, MH, MIDLINER, MIDR, MR, MR SERIES, MR400, MR600, MS SERIES, MS200P, MS300, MS300P, R, RB, RD, RD SERIES, RM SERIES, RW SERIES, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WL, WS
Date IssuedNovember 1, 2019
Date Added to NHTSADecember 9, 2019
ComponentSTEERING
Vehicles Affected70 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

Summary

STEERING DRAG LINK CASTLE NUT INSPECTION

Affected Vehicles

MakeModelYearComponent
MACK ASET 010000 STEERING
MACK CH 010000 STEERING
MACK CHK SERIES 010000 STEERING
MACK CHU 010000 STEERING
MACK CL 010000 STEERING
MACK CLASS 6 010000 STEERING
MACK CLASS 7 010000 STEERING
MACK CLASS 8 010000 STEERING
MACK CRD SERIES 010000 STEERING
MACK CRD112/113 010000 STEERING
MACK CRD200 010000 STEERING
MACK CRD92/93 010000 STEERING
MACK CS 300 010000 STEERING
MACK CS 300P 010000 STEERING
MACK CS SERIES 010000 STEERING
MACK CV 010000 STEERING
MACK CX 010000 STEERING
MACK CXU 010000 STEERING
MACK DM 010000 STEERING
MACK DM SERIES 010000 STEERING
MACK DM400 010000 STEERING
MACK DM600 010000 STEERING
MACK DM807 010000 STEERING
MACK DM809 010000 STEERING
MACK DM811 010000 STEERING
MACK DMM SERIES 010000 STEERING
MACK E6 010000 STEERING
MACK E7 010000 STEERING
MACK F SERIES 010000 STEERING
MACK FDM 010000 STEERING
MACK FREEDOM 010000 STEERING
MACK GU 010000 STEERING
MACK J-TECH 010000 STEERING
MACK LE 010000 STEERING
MACK LR 010000 STEERING
MACK M35AK 010000 STEERING
MACK M65BX 010000 STEERING
MACK MACK 010000 STEERING
MACK MB SERIES 010000 STEERING
MACK MC400 010000 STEERING
MACK MC600 010000 STEERING
MACK MH 010000 STEERING
MACK MIDLINER 010000 STEERING
MACK MIDR 010000 STEERING
MACK MR 010000 STEERING
MACK MR SERIES 010000 STEERING
MACK MR400 010000 STEERING
MACK MR600 010000 STEERING
MACK MS SERIES 010000 STEERING
MACK MS200P 010000 STEERING
MACK MS300 010000 STEERING
MACK MS300P 010000 STEERING
MACK R 010000 STEERING
MACK RB 010000 STEERING
MACK RD 010000 STEERING
MACK RD SERIES 010000 STEERING
MACK RM SERIES 010000 STEERING
MACK RW SERIES 010000 STEERING
MACK SR70 010000 STEERING
MACK T200 010000 STEERING
MACK T2060A 010000 STEERING
MACK T2090L 010000 STEERING
MACK T2090LR 010000 STEERING
MACK T300 010000 STEERING
MACK TD 010000 STEERING
MACK U 010000 STEERING
MACK V-MAC 010000 STEERING
MACK V-MAC III 010000 STEERING
MACK WL 010000 STEERING
MACK WS 010000 STEERING

Related MACK Recalls

CampaignModelYearComponentSummary
ANTHEM AN (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
ANTHEM AN (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2025 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2026 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...
PIONEER PR (4) 2027 SERVICE BRAKES, AIR:ANTILOCK:CONTROL ... Mack Trucks, Inc. (Mack) is recalling certain 2025-2027 Pioneer (4) and 2026-...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized MACK dealer. Bring this bulletin ID (S7431) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.