95 S420, Steering fluid hose leaking

[DanielW]

What is correct procedure for replacing the short hose under the fluid canister?

I believe it goes down and a few inches to the pump. Mine is seeping around that hose area, but can't see for sure exactly where the small leak is located. Do any of you know what you must remove and how difficult it may be? Anything to watch out for?

DanielW

[DanielW]

Do any of you know or have done this hose replacement, It runs from the tank down to the pump. There is little clearance so I figure the holding tank has to come off. What dia hose and which type. A dealer wanted 2 hrs labor plus parts, (hose and gaskets). I was hoping it was NOT a 2 hour procedure --- does anyone know.

[rsmcmahon]

Steering - Leaks from Power Steering Pump/Reservoir

REF. NO. MBNA 46/03

DATE: May 1996

TO: ALL MERCEDES-BENZ PASSENGER CAR DEALERS

SUBJECT:
MODELS 124,129 AND 140 WITH ENGINE 119.970/971/972/974/975 REPLACING THE CONNECTING FEED HOSE BETWEEN THE FLUID RESERVOIR AND THE POWER STEERING PUMP

In the above listed models with engine 119 (LH-SFI), a common source of power steering fluid leakage has been determined to be the connecting feed hose between the power steering fluid reservoir and the pump. Refer to the procedure below to replace the hose on pumps manufactured by "ZF" or "Vickers/LUK".

Note :The length of the hose varies with the pump manufacturer. Refer to the Electronic Parts Catalog (EPC) or Parts Microfiche for proper hose application based on the pump manufacturer.

Procedure



1. Extract power steering fluid from reservoir (35, Figure 1) using extracting hand pump - Special Tool 112 589 00 72 00.

2. Remove power steering fluid filter from inside of reservoir (35h, Figure 1).

3. Unscrew 2 bolts (not shown) from the side of the reservoir, fastening the bracket supporting the reservoir to the cylinder head.

4. Unscrew 4 bolts (35a, Figure 1) holding reservoir on its bracket from inside of the fluid reservoir and remove gasket (2g, Figure 1).


Note :The power steering fluid reservoir (35, Figure 2) is mounted on top of a support bracket (1a, Figure 2). The pump (1, Figure 2) is bolted to bottom of a support bracket.

5. Remove return line (not shown) attached to the back side of the fluid reservoir by unscrewing two bolts and remove O-ring.

6. Loosen hose clamps (30c, Figure 3) on connecting hose.

7. Loosen and remove connecting pipe (30m, Figure 3) and aluminum washer.

8. Remove the connecting hose (30j, Figure 3).

9. Inspect power steering pump bracket near threaded area for connecting pipe (30m, Figure 3). If no evidence of porous casting exists, replace the connecting hose (30j, Figure 3) and hose clamps (30c, Figure 3). Do not tighten the clamps at this time.

Note :Install correct hose for respective power steering pump manufacturer. Refer to Electronic Parts Catalog (EPC) for hose application based on pump manufacturer. Do not reuse washers, gaskets and O-rings. Replace them with new ones.

10. Replace aluminum washer and reinstall connecting pipe (30m, Figure 3). Tightening torque: 6 Nm.

11. Tighten the connecting hose clamps (30c, Figure 3). Tightening torque: 1.5 Nm.

11. Replace O-ring seal with a new one and reconnect fluid return line to the back side of the reservoir. Secure it with two bolts.

12. Replace gasket (2g, Figure 1) and reinstall power steering fluid reservoir (35, Figure 1) by bolting four 10 mm bolts (35a, Figure 1). Tightening torque: 8 Nm.

13. Attach the reservoir to the supporting bracket by bolting the bracket to the side of the fluid reservoir with two bolts.

14. Install power steering fluid filter (35h, Figure 1). Replace when applicable.

15. Replenish power steering fluid to factory level specification. Check for leaks and proper operation of the steering system.

Note :When performing any repairs on power steering hydraulic systems, maintain a high level of cleanliness. Refer to SMS - group 45 brown microfiche for any additional information.





Parts Information
Connecting Pipe 119 230 07 57
Washer for Connecting Pipe 007 603 02 01 00
Gasket under fluid reservoir 129 466 01 80
Oring for return line 119 997 00 45

[400E_FAN]

Did this on my '92 400E about a year ago. Very cramped space in there on the
W124 chassis w/ the M119 engine.

On the 400E I had to remove the driver side rotor/wiring to get at it. Also,
there is a paper like "seal" at the bottom of the reservoir on the 400E set-up;
yours maybe different...I replaced that too while I was at it.

Took me longer than 2 hours as I was new at this and because of the cramped quarters on the W124 chassis/M119 engine combo.

I have another PS leak more recently that I have been unsuccessful in root causing and it is leaking onto my new control arm & bushings.

[DanielW]

Very good info--this group is GREAT!

My car is still under Starmark Warranty--anyone know if this repair should be a covered repair?

Thanks again,
DW

[JimF]

I saw some 'seepage' which was fixed by tightening the hose clamp. Check it out; might be the same. . . .

[DanielW]

I did the hose tightening earlier when I first noticed the leak, slowed it down I think, but the hose material itself becomes wet and I still have to add about 1 oz every month or so. I plan to ask my selling MB dealer about the starmark warranty. But they are a 2 hr drive away so I'll put up with it till a get a few days off before the holidays.

Thanks again.
DW