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, HOPPER, 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, SNOW PLOW, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WESTERN, WL, WS

Bulletin SLM21-007 — July 31, 2021

Bulletin Details

Bulletin IDSLM21-007
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, HOPPER, 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, SNOW PLOW, SR70, T200, T2060A, T2090L, T2090LR, T300, TD, U, V-MAC, V-MAC III, WESTERN, WL, WS
Date IssuedJuly 31, 2021
Date Added to NHTSAAugust 2, 2021
ComponentEQUIPMENT
Vehicles Affected73 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

Service Literature Published and Released in July, 2021

Affected Vehicles

MakeModelYearComponent
MACK ASET 350000 EQUIPMENT
MACK CH 350000 EQUIPMENT
MACK CHK SERIES 350000 EQUIPMENT
MACK CHU 350000 EQUIPMENT
MACK CL 350000 EQUIPMENT
MACK CLASS 6 350000 EQUIPMENT
MACK CLASS 7 350000 EQUIPMENT
MACK CLASS 8 350000 EQUIPMENT
MACK CRD SERIES 350000 EQUIPMENT
MACK CRD112/113 350000 EQUIPMENT
MACK CRD200 350000 EQUIPMENT
MACK CRD92/93 350000 EQUIPMENT
MACK CS 300 350000 EQUIPMENT
MACK CS 300P 350000 EQUIPMENT
MACK CS SERIES 350000 EQUIPMENT
MACK CV 350000 EQUIPMENT
MACK CX 350000 EQUIPMENT
MACK CXU 350000 EQUIPMENT
MACK DM 350000 EQUIPMENT
MACK DM SERIES 350000 EQUIPMENT
MACK DM400 350000 EQUIPMENT
MACK DM600 350000 EQUIPMENT
MACK DM807 350000 EQUIPMENT
MACK DM809 350000 EQUIPMENT
MACK DM811 350000 EQUIPMENT
MACK DMM SERIES 350000 EQUIPMENT
MACK E6 350000 EQUIPMENT
MACK E7 350000 EQUIPMENT
MACK F SERIES 350000 EQUIPMENT
MACK FDM 350000 EQUIPMENT
MACK FREEDOM 350000 EQUIPMENT
MACK GU 350000 EQUIPMENT
WESTERN HOPPER 350000 EQUIPMENT
MACK J-TECH 350000 EQUIPMENT
MACK LE 350000 EQUIPMENT
MACK LR 350000 EQUIPMENT
MACK M35AK 350000 EQUIPMENT
MACK M65BX 350000 EQUIPMENT
MACK MACK 350000 EQUIPMENT
MACK MB SERIES 350000 EQUIPMENT
MACK MC400 350000 EQUIPMENT
MACK MC600 350000 EQUIPMENT
MACK MH 350000 EQUIPMENT
MACK MIDLINER 350000 EQUIPMENT
MACK MIDR 350000 EQUIPMENT
MACK MR 350000 EQUIPMENT
MACK MR SERIES 350000 EQUIPMENT
MACK MR400 350000 EQUIPMENT
MACK MR600 350000 EQUIPMENT
MACK MS SERIES 350000 EQUIPMENT
MACK MS200P 350000 EQUIPMENT
MACK MS300 350000 EQUIPMENT
MACK MS300P 350000 EQUIPMENT
MACK R 350000 EQUIPMENT
MACK RB 350000 EQUIPMENT
MACK RD 350000 EQUIPMENT
MACK RD SERIES 350000 EQUIPMENT
MACK RM SERIES 350000 EQUIPMENT
MACK RW SERIES 350000 EQUIPMENT
WESTERN SNOW PLOW 350000 EQUIPMENT
MACK SR70 350000 EQUIPMENT
MACK T200 350000 EQUIPMENT
MACK T2060A 350000 EQUIPMENT
MACK T2090L 350000 EQUIPMENT
MACK T2090LR 350000 EQUIPMENT
MACK T300 350000 EQUIPMENT
MACK TD 350000 EQUIPMENT
MACK U 350000 EQUIPMENT
MACK V-MAC 350000 EQUIPMENT
MACK V-MAC III 350000 EQUIPMENT
WESTERN WESTERN 350000 EQUIPMENT
MACK WL 350000 EQUIPMENT
MACK WS 350000 EQUIPMENT

Related MACK Recalls

CampaignModelYearComponentSummary
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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 (SLM21-007) 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.