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NEWS | Oct. 26, 2021

M149A2 Water Trailer: TM Updates for Brake Assemblies & Water Tank

M149A2 Water Trailer
(Photo courtesy of TACOM)
 
If you have an M149A2 water trailer, there are some issues when it comes to the brake configuration in TM 9-2330-267-13&P (Dec 15).

There are four (4) updates to the TM that you’ll need before you perform any brake work or order parts shown in Figs 7, 10, 11 and 21. The last update included below is for the water tank.

The TM update to Fig 7, Master Cylinder and Bracket, shows the new style cap and the master cylinder/air chamber assembly option.
 
Fig 7 - Master Cylinder and Bracket (Added new style cap and master cylinder/air chamber assembly option)
Fig 7 - Master Cylinder and Bracket (Added new style cap and master cylinder/air chamber assembly option)
 
The update to Fig 10, Master Cylinder, shows the updated master cylinder assembly and breakdown.

Fig 10 - Master Cylinder (Updated master cylinder assembly and breakdown)
Fig 10 - Master Cylinder (Updated master cylinder assembly and breakdown)
 
The TM update to Fig 11, Air Hoses, Fittings, Relay Valve, Air Chamber and Pressure Tank, shows the current M149A2 brake system.

Fig 11 - Air Hoses, Fittings, Relay Valve, Air Chamber and Pressure Tank (Added the current M149A2 brake system)
Fig 11 - Air Hoses, Fittings, Relay Valve, Air Chamber and Pressure Tank (Added the current M149A2 brake system)
 
The current version of Fig 21, Water Tank, Body Brackets and Manhole Cover, shows the older water tank. The update to Fig 21 has added the front heater port to match the latest drawing of the water tank.

Fig 21 - Water Tank, Body Brackets and Manhole Cover (Added front heater port)
Fig 21 - Water Tank, Body Brackets and Manhole Cover (Added front heater port)
 

You can download a copy of each update (consolidated in a single document), which includes NSNs, part numbers and descriptions from the following attachment, and keep them handy until the TM is updated. Click link below:
 

TM Fig Updates

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