TM 5-2350-378-23&P
FIELD MAINTENANCE
M9 ACE HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM FUNCTIONAL CHECK-OUT
INITIAL SETUP:
Personnel Required
References
Combat Engineer, 21B
TM 5-2350-262-10
Construction Equipment Repairer, 91L
M9 ACE HYDRAULIC DIAGNOSTIC CENTER (HDC) SYSTEM FUNCTIONAL CHECK-OUT
Purpose:
The purpose of the Functional Check-Out is to ensure that the vehicle and the HDC System are functioning properly.
Assumptions:
1. Vehicle relief valve settings have previously been adjusted using a GS-5 pressure gauge, with a tolerance
of +/- 100 psi (689.4757 kPa).
2. The accuracy of the HDC system is +/- 100 psi (689.4757 kPa).
3. Pressure values within +/- 200 psi (1378.951 kPa) are considered within specification.
4. Other vehicle operational characteristics meet the specifications.
Procedure:
The individual tests should be conducted in accordance with this procedure. Figures and tables provide additional
information. The HDC System is considered fully operational when it has passed all of the tests.
WARNING
Before performing any troubleshooting in bowl, move the ejector forward and disconnect the
ejector cylinder from the hydraulic system by pulling the handle down on ball valve V23,
located in the rear of the bowl area, just below the main Directional Control Valve (DCV) bank.
Failure to comply may result in severe injury or death to personnel.
NOTE
Problems existing in the vehicle hydraulic system when the HDC System Functional Check-
Out is performed could result in the HDC System not passing all portions of the Functional
Check-Out. Because of this, it is important that all applicable vehicle PMCS checks have
been performed and that vehicle hydraulic functions be exercised prior to performing the HDC
System Functional Check-Out to determine exactly which vehicle hydraulic functions are
impaired and to use this information with the results of the Functional Check-Out to help
isolate the problem area.
0025-1
03/15/2011Rel(1.8)root(maintwp)wpno(M10001)
