Quick question,

I want to remove the pulley on a ZF style power steering pump off of a 183 300D. Any tips? Especially how to hold the shaft to get the nut off. Is the nut reverse thread? Would a 3 jaw puller work......

Thanks

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

Tips:


Be careful with three legged pullers - you can quite easily bend the pulley out of shape


I have found most of the ones I have had in bits are stubborn to remove: I've needed to apply heat at the joint - this does knacker the seal.


To replace the seal you ideally need to remove the shaft - you then need to pay particular attention to the orientation of the sliding vanes (get this wrong and the pump don't pump)


As for shaft holding - on the car is unlikely to work if the pulley hasn't come off since the 1980s - once off the car then the world is your oyster

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1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!

With the puller, put on pressure and when you can see it deflecting some, tap it around and apply penetrating oil. Be patient and you'll get it off without damaging it.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

My memory is straining on this but waay back in 2008 someone posted that you can use a generic puller power steering puller but you had to widen the groove or something on it to get it to fit.The stock power steering pulley puller is 108 589 02 33 00. You can look at the pelican parts tool list and see if there is a picture of what it looks like.

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84 300D, 82 Volvo 244Gl Diesel

I had ZERO success with a puller. I saw the pulley beginning to bend where the puller claws attached and pressed abort. I ended up hanging the pump by the pulley on two pieces of wood and whacking the shaft with a hammer. The pulley popped right off.

Edit* The nut affixing the pulley, requires an impact driver.

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1981 240D 4sp manual. Ivory White.

In the past I have used impact wrench and the usually loosen the Nuts really quick. But, there is a Tool that has a Cut Fan Belt to tighten around the pulley to grip it so the Nut can be taken off.
One of the names V-Belt Pulley Holding tool,

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84 300D, 82 Volvo 244Gl Diesel

Thanks for the tips and advice. I assume the nut on the pulley is reverse thread (i.e turn it to the RIGHT to remove it instead of left) correct??

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2012 Mercedes ML350 Bluetec 102K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 238K (mine)
1998 Volvo S70 T5 Turbo 211K (kids)
1994 Ford F150 4WD 246K (firewood hauler)
1983 Mercedes 300D 384K (diesel commuter)

You are going to have to wait till someone who has done the job before responds or find a thread in the Fast navigation Fast navigation Do It Yourself Links Actually the Pulley mounts on a tapered shaft with a Key. That means the rotation of the Pulley is not going to back off a nut because the pulley is not going to turn.I have never done this job before but I am looking at a picture in the paper Factory service manual of the Pulley Shaft and it has normal right hand treads in the picture. But, then there is a separate section for the Vickers type pump and no pic of the threads.

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84 300D, 82 Volvo 244Gl Diesel

https://www.pelicanparts.com/techarticles/Mercedes-W123/52-ENGINE-Power_Steering_Pump_Rebuild/52-ENGINE-Power_Steering_Pump_Rebuild.htm


From the site:
"With the pump off you will need to remove the nut holding the pulley on. Basically the only way to remove this nut is to use an impact gun and a 22mm socket"

Notice nothing about any left handed threads.

Also if you use an impact wrench and socket on the Nut if you got the direction wrong it might tighten up the nut a bit but then the pump is simply going to rotated likely keeping you from stripping the threads or snapping off the shaft.

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84 300D, 82 Volvo 244Gl Diesel

I removed the pump, suspended it upside down by the pulley between two wooden blocks then drove the shaft out of the pulley with light taps using a plastic hammer. If you hit it too hard you will damage the internals and have a full rebuild on your hands.

I believe this tool will work to hold a power steering pump pulley while removing the nut using an impact driver. I have a similar rubber wrench tool and I've used it many times to remove stubborn jar lids, i.e. pickles, relish, anytime you don't want to break the bones in your wrist trying to remove an impossible jar lid......

https://www.amazon.com/Pssopp-Wrench-Universal-Opener-Kitchen/dp/B09D3VGPF5/ref=sr_1_9?crid=3U860TGYFK5XG&keywords=rubber+wrench+jar+opener&qid=1669487335&sprefix=rubber+wrench+jar+opener%2Caps%2C103&sr=8-9

Back to the puller. People on this forum in the past have said there is something on the generic power steering pump pullers in the first attached picture that can be ground to fit the Mercedes ones.
The generic one works well on US PS pumps. Autozone has a free rental on them.

The next attached picture is a snap-on style one. It grips the heavy metal slot on the front of the pulley. I have never paid attention if Autzone has a rental on those or not. I read somewhere it is too long to remove the pulley on the vehicle.

Last picture if you can get the bearing plate/bearing splitter especially on the flat side of it behind the pulley and you can get the puller jaws to hook on the bearing plate/bearing splitter you can often remove the pully without damage.

Sometimes you can use a smaller version of the bearing plate/bearing splitter to grip on the have lip of the power steering pully and use something like a steering wheel or crank damper puller on it.

Harbor freight used to sell the bearing plate/bearing splitters.

Attached Thumbnails

     

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84 300D, 82 Volvo 244Gl Diesel

They strap wrench shown might work on an alternator but I doubt it on a power steering pump.
They make special holder just for that and they have an actual fan belt on them. Either a V grove belt or a serpentine belt.

The in the first attached picture is a serpentine belt one.

I used to have one of the 12-volt impact wrenches in each car. They are made for tire changing. They work almost as well as a 1/2 inch pneumatic impact wrench does. A couple raps with one of those removes alternator nuts and even loosened the crank shaft bolt on my Volvo diesel. It would likely work on the power steering nut.
And of course, it also has other uses.


Harbor freight sells them similar to the one in the attached picture.

What every you use to remove the nut or bolt from a power steering pump or alternator if you want to use the poper torque on it you need a steady hold on the pully to do that.

Attached Thumbnails

   

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84 300D, 82 Volvo 244Gl Diesel

Note there is a way to take an old fan belt and using 2 combination wrenches on the belt to tighten it firmly around the pulley to hold the pully. I saw it but never copied the picture nor copied the site and I have never searched for it.

It is barbaric but some have used a regular pipe wrench on the puller end of the power steering pump pulley to loosen and torque the nut or bolt.

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84 300D, 82 Volvo 244Gl Diesel

Go back to post #5 and do that .

Remember to protect the threads ! DO NOT bang on the end of the threaded shaft ! .

Use a punch in the center or similar .

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-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better