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Service bulletin KC-2273-Rev6

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.

The communication, as NHTSA indexes it (as of 2026-10-19)
TypeService bulletin
NHTSA id10237336
Published by NHTSA2023-06-05
Manufacturer's numberKC-2273-Rev6
Manufacturer's date2023-05-02
NHTSA componentWHEELS; SUSPENSION; POWER TRAIN

NHTSA's summary

CBR: Pre-Delivery Inspection (PDI) Torque Values. This is to help with the torque specs needed to complete a Pre- Delivery Inspection (PDI).

The document

The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.

Components

Suspension, Transmission and driveline, Wheels

Vehicles listed
MACK ANTHEM (AN)2024 (the catalog's model; the bulletin names a series or trim of it)
MACK GRANITE (GR)2024 (the catalog's model; the bulletin names a series or trim of it)
MACK LR2024
MACK MD2024
MACK PINNACLE (PI/PN)2024 (the catalog's model; the bulletin names a series or trim of it)
MACK TERRAPRO (TE)2024 (the catalog's model; the bulletin names a series or trim of it)

Listing a model year does not mean every vehicle of it is concerned: the document says which.

Recalls for the same vehicles and component
20261082026-03-11. Powertrain

A recall listed here may apply to some of the same vehicles. Only the manufacturer can say whether it applies to one vehicle.

Other bulletins for the same vehicles and component
TSB M-913-001 2026092026-10-02. Service bulletin. Parker engine-mounted hydraulic pump service bulletin.
CBR 2595 0720262026-08-03. Service bulletin. CBR - The purpose of this CBR is to provide information on 2010 and newer Mack Granite chassis experiencing a low frequency vibration.
SC S4920 2026042026-05-05. Service campaign. SC - Trunion Nut Pinch Bolt.
CBR 2573-1 2026042026-05-05. Service bulletin. CBR - Mack Chassis - Through Shaft Bearing Retainer Breakage On Mack Carriers.
CBR 2362-3 2026042026-05-04. Service bulletin. CBR - Mack Carrier Nut Adhesive Change.
TSB M-432-002A 0320262026-04-02. Service bulletin. TSB - Cable, Gear Selector, Replacement
CBR 2246-5 0320262026-04-02. Service bulletin. CBR - Z Spring Bracket Wear.
CBR 2218-6 0320262026-04-02. Service bulletin. CBR - Parker F3 Hydraulic Pump Troubleshooting.
S4558 2025062025-07-03. Service campaign. Mack trucks has determined that certain model year 2021-2024 PI models built with 4.19 rear axle ratios could experience elevated axle oil temps under high road speeds. To correct this issue the 4.19 ratio carriers need to be swapped to 3.79 ratio carriers. Follow the instructions below to replace both carriers with new ones.
CBR 2464-1 2025052025-06-02. Service bulletin. Mack Chassis - Rear Axle Overheat