Leakage in steering system, troubleshooting · ad4600d500005a · Mercedes-Benz WIS

AD46.00-D-5000-05A

Leakage in steering system, troubleshooting

Model

414, 636, 638, 639, 690, 900, 901, 902, 903, 904, 905, 906, 909

General assessment of leakage

Check oil level in reservoir:

 If oil level is not OK: Locate leakage; use leak oil detection spray if necessary.

 If oil level is not OK, but no external oil loss is visible, detach side boots from steering gear. If the side sealing rings are leaky, the oil will collect in the boots but will not always be visible from outside.

	Component	Notes	Remedy
1	Power steering pump	Check for any leakages at interfaces (connection fittings, sealing rings).
		If there is leakage 	Install new seals.
		Check oil reservoir and oil feed to power steering pump.
		If there is leakage 	Seal oil reservoir and oil feed.
		Check power steering pump.
		If there is leakage 	Replace power steering pump.
2	High-pressure/low-pressure line	Examine interfaces to components (connection fittings, sealing rings).
		If there is leakage 	Replace sealing rings and/or replace high-pressure/low-pressure line.
		Check high-pressure/low-pressure line for chafe marks and cracks.
		If damage is present 	Replace high-pressure/low-pressure line.
		Check ferrule fitting at transition between steel and hose. Note: On new vehicles, assembly oil residue can be present but does not indicate leakage.
		If there is leakage 	Replace high-pressure/low-pressure line.
3	Steering gear	Check steering gear in steering shaft area. Note: Grease under the dust cap is normal. A significant leakage is not present unless there is droplet formation.
		If there is leakage 	Replace steering gear.
		Check interfaces between steering gear and connections for high-pressure/low-pressure line
		If there is leakage 	Replace sealing ring and, if necessary, support ring. Note: Closed support rings cannot be replaced. If they are damaged, the complete high-pressure line must be replaced.
		Check side sealing rings of toothed rack under boot. Note: Grease on the toothed rack or oil film on the inside of the boot is normal and should not be considered as leakage.
		If there is leakage 	Replace steering gear.
		Check whether leakage is present at oil lines (from control head to steering gear housing).
		If there is leakage 	Replace steering gear.