300SD/126 Antenna Mast Replacement/Repair - Mercedes-Benz Forum

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Old 09-29-2004, 08:20 PM   #1 (permalink)
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300SD/126 Antenna Mast Replacement/Repair

All:

Replaced masts in our '83 and '84 300SDs last week. Both OEM Hirshman units.

One (toothed) was balky despite oiling often didn't retract fully, other (smooth) had a broken nylon actuator and didn't go up.

If your actuator motor/mechanism is working correctly, replacement process is straightforward if nylon actuator is intact (5 minutes), and if broken inside the antenna mechanism, it's only a few additional steps to repair it (maybe 30 minutes). :y

When antenna is down/radio off, unscrew the antenna retaining nut and turn on radio - now quickly as antenna extends, keep pulling on it until the antenna and all of internal nylon actuator pulls free from antenna motor mechanism inside fender.

Now you'll see if you have the 1) toothed actuator or the 2) smooth one. You'll need to specify the type (toothed/smooth) you need from your parts supplier. Our '83 has a smooth actuator, the '84 had a toothed one. We got our replacement masts from importec.com (Dallas, TX) for ~ $21 smooth aftermarket and $29 toothed OEM Hirshman.

If as in the case of our '83, the nylon actuator broke and part of it remained inside the antenna actuator motor mechanism, you'll have to remove the motor/actuator from the inside trunk fender area and disassemble the unit to remove the broken remaining piece(s) of the nylon actuator.

Not hard to do - just pull back the molded carpet in trunk and remove a handful of screws and the fender top retaining nut, and disconnect power/control cable, to remove from car and open up the antenna mechanism case and remove actuator piece(s). This is also a good time to lube the internal gears etc.

Once antenna shaft has been removed, turn off the radio (assuming it was on, otherwise turn it on wait a few moments for it to “extend� then turn it off… ) and quickly insert the end of the new antenna mast nylon actuator down into the fender top antenna mechanism opening and let the mechanism pull the actuator down into the automatic antenna unit. I wiped the extended shafts with a light machine oil and plan to keep them clean to avoid future malfunctions.

Now enjoy your new correctly operating automatic antenna on your classic Mercedes!!!

DRG [:D]
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Old 06-07-2012, 07:32 AM   #2 (permalink)
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Can anyone give me the part number for the smooth antenna mast? OEM of course. Thanks
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Old 06-07-2012, 08:13 AM   #3 (permalink)
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I did a thread already on rebuilding the Hirschmann antennas. Should be in there.
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Old 06-07-2012, 09:38 AM   #4 (permalink)
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Quote:
Originally Posted by mclare View Post
I did a thread already on rebuilding the Hirschmann antennas. Should be in there.
I did go through your post Mclare, but could not find the part number for the smooth edged cable. I ordered one yesterday through my local dealer. Unfortunately even though I specified the smooth vs toothed, they still got me the wrong one. Mine has the smooth edged cable. In order for them to run it through the catalog they need the correct part number.

Much appreciated.
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Old 06-07-2012, 11:19 AM   #5 (permalink)
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This is the shot from the epc.

Mast only.
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File Type: jpg Screen shot 2012-06-07 at 2.18.18 PM.jpg (21.3 KB, 102 views)
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Old 06-07-2012, 01:25 PM   #6 (permalink)
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Quote:
Originally Posted by Rmac58 View Post
This is the shot from the epc.

Mast only.
The 8035 code is what I already have Bob. I'm looking for the smooth edged cable. According to the dealer it's either 8034 or 8037 but they can't figure which one goes on mine as it is a special order from Vancouver.

Thanks for your help
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Old 06-07-2012, 01:33 PM   #7 (permalink)
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Non-ribbed (smooth cord) is part # 9000001317



Same one as 107's 1977-1983 if that helps.


edit: I believe the above part # is the Hirschmann part number and that the smooth cord antenna is no longer available from the dealer. If you google the number above you should get some choices on where to get the antenna from.

Last edited by kodiakj2; 06-07-2012 at 01:44 PM.
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