: There are two (2) different NSNs for cab lifting cylinders: NSN 3040-01-668-2122 (17 inches long) and NSN 3040-01-647-0564 (13 inches long).
Photo by Staff Sgt. Frank Brown
Maintainers, there’s been some confusion in the field because there are two (2) different types of lifting cylinders shown in TM 9-2320-333-23&P (IETM EM 0372, Jun 19) with different NSNs for the cab of FMTV A1P2s. The two (2) types are different lengths and cannot be installed on the same truck because the length difference will prevent the cab from raising or lowering properly.
The longer cab lifting cylinder, NSN 3040-01-668-2122, is 17 inches long and is shown in Fig 1634 in the IETM. This cab lifting cylinder is used on up-armored (B-kit) trucks with the underbody kit installed.
Mount 17-in cab lifting cylinder to FMTV A1P2 with underbody kit
The shorter cab lifting cylinder, NSN 3040-01-647-0564, is 13 inches long. It’s shown in Fig 40 (2 ½-ton) and Fig 1040 (5-ton) in the IETM. This cab lifting cylinder is used on trucks that are either up-armored (B-kit) or standard configuration (A-kit) vehicles.
Mount 13-in cab lifting cylinder to FMTV A1P2 with A-kit or B-kit
TACOM recommends that when you’re replacing the cab lifting cylinders that you make sure both cylinders are the same length and that they are the correct NSN for the truck.
Jot this info down until TM 9-2320-333-23&P (IETM EM 0372, Jun 19) is updated. TACOM expects this info to appear in the next revision to the IETM. The update will show where to use the specific cab lifting cylinder.