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P/S Pressure Switch

  1. Disconnect pressure hose from power steering pump. Attach Pressure Gauge (MB990662-01) and Adapters (MB990993-01 and MB990994-01). See Figure . Tighten fittings to 22-29 ft. lbs. (30-39 N.m).
  2. Bleed system. See HYDRAULIC SYSTEM BLEEDING under LUBRICATION  . Turn wheel several times to bleed air from gauge. Start engine and let idle. Place thermometer in reservoir. Check fluid level. Add fluid as necessary.
  3. When fluid temperature reaches 122-140°F (50-60°C), disconnect connector from P/S pressure switch. Connect ohmmeter across switch terminals. Slowly close shut-off valve. Check pressure when ohmmeter indicates switch has closed (continuity). Pressure should be 218-290 (15-20 N.m). Slowly open shut-off valve. Check pressure when ohmmeter indicates switch has opened (no continuity). Pressure should be 102-174 (7-12 N.m). Reinstall pressure hose. Do not twist hose or let hose interfere with adjacent parts. Replace P/S pressure switch if pressure is not within specification. Bleed system.
CAUTION: DO NOT keep shutoff valve closed more than 3 seconds at a time. DO NOT keep steering wheel turned to full lock position for more than 10 seconds at a time.
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