500SL (129.067) V8-5.0L (119.972) (1993)
Convertible Top Control Module: Technical Service Bulletins
Convertible/Roll Bar - Hydraulic Unit Modifications
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: March 1994 (supercedes S.I. MBNA 77/10, Sept. 1993)
REF. NO. 77/33
As of August 1992 production of model 124.066 and April 1993 production of model 129, a revised soft top/roll bar hydraulic unit is installed. The main
valve (A7/5y1) has been eliminated on the hydraulic unit (pump), part no. 124 800 23 48. The previous hydraulic unit (W/O main valve) is no longer
available as a replacement part.
Effective Serial Number
Model
As of Chassis End Number
124.066
B 837 706
129
F 083 891
The revised hydraulic unit (pump) may be installed in models prior to production phase-in, however, in model 129, the soft top control module must be
replaced with a revised version as well. Replacing the pump without replacing the control module will lead to operational problems when
removing/attaching the hardtop. (Hardtop will sink after being raised off body.)
PARTS INFORMATION
Qty.
Part Name
Part Number
(Old)
(New)
1
Soft Top Control Module
129 820 00 97
129 820 24 26
Note:
With the elimination of the main valve, the soft top fabric bow and soft top compartment cover will be pulled down slightly by their latches with
hydraulic pressure from the hydraulic unit. This will occur when operating the roll bar with the power soft top switch or roll bar switch and should be
regarded as normal operation (not a fault).