This article can potentially save your unit $2100
When working on the hydraulic cooling fan for the M109A7 howitzer and M992A3 ammo carrier, you’re supposed to inspect the O-ring face seal (ORFS) and quick disconnect (QDC) fittings. The TM says if you find an unserviceable O-ring, replace the applicable ORFS or QDS fitting.
But those fittings range in price anywhere from $26 for an ORFS fitting to between $1,093 and $2,100 for a QDC fitting. It’s a lot cheaper and faster to just replace the O-ring instead.
Order O-rings with NSN 5331-00-498-5755. They only cost 57 cents each, so that’s a pretty good cost savings over replacing an ORFS or QDC. Replacing just an O-ring will also save you a lot of time and effort.