300E 4MATIC (124.230) L6-3.0L (103.985) (1990)
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Power Steering Pump: Testing and Inspection
Diagnosis by Symptom
Programmed Repairs for the 765.9 Steering Gear and Power Steering Pump Models 61-67 and 161-167:
Condition:
Insufficient power assistance at left full lock, spongy.
Application:
All Models
Cause:
Air cushion in steering housing. This occurs in the most cases after performing repairs and incorrectly filling power steering pump
/tandem pump. See: Steering Gear/Service and Repair
Remedy:
Drive car until oil in power steering pump/tandem pump is at normal operating temperature. Then park car at full right lock. Raise car
at front axle with vehicle jack. Wait approx. 10 minutes. Run engine at idle and with the car on the ground, turn steering several times
from full left to full right lock. Any remaining air cushion, detectable only when turning the steering rapidly to full left/right lock, will
be slowly eliminated by the oil circulation (100-200 km).
Condition:
Oil flows out at steering gear adjusting screw.
Application:
Models 124 and 201
Cause:
Polyamide ring on lock nut does not provide adequate seal.
Remedy:
Replace lock nut, part No. 001 990 70 51
-
To do this, remove steering gear on cars with gasoline engines. Remove air filter housing complete on cars with diesel engines.
-
Mark position of adjusting screw with notches (arrows).
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Replace lock nut without altering position of adjusting screw.
-
Tighten lock nut to 65 Nm.
NOTE: If the adjusting screw has been inadvertently turned, reset friction value of steering gear. See: Steering Gear/Service and Repair
Condition
Oil flows out through breather cap of power steering pump.
Application:
Models 124 and 201
Cause:
Reservoir incorrectly filled (too high) and/or no breather in protective tube.
Remedy:
Correct the oil level and/or drill breather (arrow) according to sizes indicated in image.
Condition:
Oil flows Out through radial seal ring in pitman arm shaft/bearing cover.
Application:
Models 124 and 201
Cause:
Faulty seals (Gotze, Pionier-Laura).
Pressure peaks in lubricating circuit (since 3/89 relief restrictor fitted).
Remedy:
Install new seal (Freudenberg - color blue). See: Steering Gear/Service and Repair
