HELP! P/S Pump on 75 300D - Mercedes-Benz Forum

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post #1 of 4 (permalink) Old 10-03-2004, 09:50 AM Thread Starter
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HELP! P/S Pump on 75 300D

I am trying to remove the belt from the P/S pump on the 75 300D. I have found three securing bolts. Loosening them frees the unit up but does not give enough play to allow me to remove the belt. Did I miss a bolt or tensioner? Do I need to remove something like the pully on the main crank? Please help me on this

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post #2 of 4 (permalink) Old 10-03-2004, 06:53 PM
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RE: HELP! P/S Pump on 75 300D

I believe that on my 77 300D there is a bolt that actually tightens the belt. i have adjusted it before but don't remember where it is. Try looking behind the pulley.
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post #3 of 4 (permalink) Old 10-03-2004, 08:50 PM
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RE: HELP! P/S Pump on 75 300D

Look along the back edge of the pump. There should be a bolt sticking out to the side, that will loosen/tighten the belt. Of course, your 300 might have a different set-up than the 4.5, but on the 4.5 there are 3 hold down bolts to loosen, then the adjusting shaft.

I wish I had a picture to show you.

1973 280SEL 4.5, TMU
1986 560SEL, 205K
1979 240D, 81K, still behind a barn
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post #4 of 4 (permalink) Old 10-04-2004, 08:16 PM
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RE: HELP! P/S Pump on 75 300D

I just checked my two 300D motors, and the Chilton's Manual. I have 3 bolts: 2 on the bracket side facing the radiator, one slightly above and to the left of pulley, and the other slightly below and to the right of the pulley; the third bolt is on the rear of the bracket. All 3 are in slotted holes, allowing the PS unit to adjust about an inch or so. If all three bolts are sufficiently loose, that should be enough to allow you to remove the belt. I have done this several times. YOu dont need to remove the pulley.

BTW, MB only made this motor (3005cc) for 2 years ('75-'76). For 1977, the W115 chassis was discontinued, and the 300D appeared in the W123 chassis. Although basically the same motor, it was modified to 2995cc, and the position of the power steering unit changed, among other things. So the post from the 1977 300D above does not apply to your motor.
Good luck. Let me know how you make out.

1975 W115 300D
Spare Motor: from 1976 W115 300D
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