ONE OR MORE HYDRAULIC CIRCUITS NOT WORKING.

TM 9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

2-15. TROUBLESHOOTING INSTRUCTIONS (CONT).

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

2. ONE OR MORE HYDRAULIC CIRCUITS NOT WORKING.

Check to see if PTO switch has engaged PTO pump. You should hear a slight humming

Step 1.

sound.

If the PTO pump has not engaged, refer to Electrical System Troubleshooting (page

2-116 thru 2-118).

If PTO pump engages and one or more hydraulic circuits do not work, go on to

Step 2.

Check selector valve for faulty operation, loose line connections, or damage.

Step 1.1

Tighten loose connections.

Replace if damaged (para 19-12).

M984El ONLY Check heavy-duty winch manifold valve for loose line connections or

Step 2.

damage.

Tighten loose connections.

Notify the supervisor if valve or lines are damaged.

Check for loose or damaged lines and connections (fig. l-14) (M984El: fig. 1-14.1).

Step 3.

Tighten loose connections, replace damaged lines.

Check oil level in reservoir (LO 9-2320-279-12).

Step 4.

Add oil as necessary (LO 9-2320-279-12).

Check hydraulic pump for leaks.

Step 5.

Tighten loose line connections. Add oil as required (LO 9-2320-279-12).

Check relief valve for loose line connections or damage.

Step 6.

Tighten loose connections and replace damaged lines.

Change 3

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