TM-9-2320-279-20-1

M977 SERIES, 8x8 HEAVY EXPANDED MOBILITY TACTICAL TRUCKS (HEMTT)

TECHNICAL MANUAL; MAINTENANCE INSTRUCTIONS; ORGANIZATIONAL MAINTENANCE, VOLUME 1 OF 3

TM-9-2320-279-20-1 - Page 302 of 985

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

TANKER SYSTEM

WARNIN G

Before starting any troubleshooting on the M978 tanker, be sure to read and follow

all safety precautions in FM 10-71, Petroleum Tank Vehicle Operations, and

TM 9-2320-279-10, Operate tanker. Liquids and vapors carried in the M978 tanker are

flammable and toxic and can cause injury or death.

NOTE

When troubleshooting the M978 tanker, refer to Figure 2-11, Tanker Component

Identification, Figure 2-12, Tanker Fuel System Functional Diagram, Figure 2-13,

Tanker Operation Functional Diagram, and Figure 2-14, Tanker Fuel System

Schematic and FO-1, Electric Diagram.

1.

DISCHARGE LINE PRESSURE GAGE (DLPG) OR VENTURI NOZZLE PRESSURE GAGE

(VNPG) NOT WORKING.

Step 1. Check DLPG/VNPG gage tubing connections for looseness or damage and for damaged

tubing.

Tighten loose tubing or damaged connections and replace damaged tubing.

Step 2. Check for obstructions in DLPG/VNPG tubing and in piping at tubing connections.

Remove tubing from DLPG/VNPG gages and piping (para 25-4). Clean piping and

tubing. Inspect for damage. Replace damaged tubing.

Step 3. If problem remains, replace defective DLPG/VNPG gage (para 22-3 or 22-4).

2-209