Pre-Adjustment Testing

On all models, connect a pressure gauge between steering pump and steering gear. See Fig 1 . Ensure fluid in reservoir is at level mark. Place pressure gauge so it can be seen from the driver's seat.

Fig 1: Pressure Gauge Test Set Up Ensure fluid level is at full mark when testing.
On 760 GLE models, remove steering wheel impact guard by lifting lower edge and pulling out. On all other models, remove by compressing sides slightly. On all models, install a torque wrench on steering wheel nut.
With engine at idle, turn steering wheel, with torque wrench, slowly to the right. Read torque when pressure reaches 171 psi (12 kg/cm² ) on cam gear-type, 285 psi (20 kg/cm² ) for ZF steering gear.
Repeat operation turning wheel to left. Torque should be 2.6-3.3 ft. lbs. (3.5-4.5 N.m) as gear approaches specified pressure.
Difference between both sides must not exceed 9 INCH Lbs. (1 N.m) on cam gear-type. Difference must not exceed 4.4 INCH Lbs. (.5 N.m) on ZF steering gear.
If difference exceeds specifications on 760 GLE models, the steering gear must be rebuilt or a new one installed. If proper specifications cannot be obtained, on cam gear-type pumps, see CAM GEAR-TYPE ADJUSTMENT in this article.