Pagoda SL Group

W113 Pagoda SL Group => Drive train, fuel, suspension, steering & brakes => Topic started by: Thierry du Laos on December 27, 2017, 08:50:29

Title: W113 280SL 1968 Automatic gear box
Post by: Thierry du Laos on December 27, 2017, 08:50:29
Hi,
Who can give me the P/N of the 2 pressure switches installed on the automatic gear box, to avoid stalling while selecting Drive or Reverse?
Both of them are in short circuit, making the fuse to burn as always giving continuity....
And where I can buy these spare parts?
Thanks
Title: Re: W113 280SL 1968 Automatic gear box
Post by: Pawel66 on December 27, 2017, 18:38:32
The part number is A0015421317 and you just order them with the Mercedes dealer. They are ca $500 a piece. May try other places or aftermarket.

However: I cannot imagine how can they blow a fuse. They are hydraulic switches. All they do is to provide the ground from transmission housing to a green/red wire that goes from each of them to the connector on the transmission and then one green/red wire goes to the solenoid and provides ground to it so that it works. If the switches are off, no ground, no solenoid action. It would always look like "both of them" because they are connected.

If you have your fuse 5 blown, it may be the solenoid, but not the switches. Check the solenoid connection - there are wires sticking out of this solenoid housing that connect through a plastic base with the power supply to the solenoid from fuse 5 (green, red, black) and the wire I mentioned, ground from switches (red, green). Make sure the wires that stick out of the solenoid housing are not touching each other.

Also: the reverse lights are also powered from fuse 5. If there is a short, when you select R, you will blow the fuse. This involves switch on the firewall and the lights themselves to check.
Title: Re: W113 280SL 1968 Automatic gear box
Post by: cfm65@me.com on December 28, 2017, 02:38:29
Hi Thierry,
Complements of the season.
Pawel is correct, those are hydraulic ground switches which supplies earth to the constant speed solenoid when R or D is selected.
Unless, you are saying that they are always ‘in short circuit’, without R or D selected. If so, I believe you have a bad connection elsewhere.  Maybe a shafed wire or check the connections at the bottom left of the gearbox.
Regards
Chris