TRANSFER CASE WILL NOT LOCK UP.

9-2320-279-20-1

Troubleshooting Malfunctions (Cont)

TROUBLESHOOTING INSTRUCTIONS (CONT).

2-15.

Table 2-9. Troubleshooting (Cont)

Malfunction

Test or Inspection

Corrective Action

AIR SYSTEM (CONT)

14. TRANSFER CASE WILL NOT LOCK UP.

Step 1. Check HI-LO Range valve for loose or damaged connections and adjustment.

Tighten connections, adjust, or replace HI-LO Range valve (para 9-6).

Step 2. Check for damaged air lines to HI-LO Range valve, TRACTION CONTROL valve, and

transfer case lockup chamber.

Repair or replace damaged lines.

Step 3. Check cab air supply at pressure protection valve inlet port.

Pressure protection valve opens to supply air out at 60 to 70 psi (414 to 483 kPa).

If pressure protection valve does not open, replace defective pressure protection

valve (para 11-16).

Step 4. Remove instrument panel (para 7-19). Check TRACTION CONTROL valve for air supply

when valve is operated.

If TRACTION CONTROL valve has air in but not air out when TRACTION

CONTROL valve is operated, replace defective TRACTION CONTROL valve

(para 9-7).