Remove/install hydraulic cylinder on front catch - AR77.37-P-3560W

MODEL 172.4, 231 

Shown on MODEL 172.4 on right front lock hydraulic cylinder (1) 

Fig 1: Identifying Hydraulic Cylinder On Front Catch Remove/Install Components - Shown On Model 172.4 (1 Of 2)

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Fig 2: Identifying Hydraulic Cylinder On Front Catch Remove/Install Components - Shown On Model 172.4 (2 Of 2)

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Shown on model 231 

Fig 3: Identifying Hydraulic Cylinder On Front Catch Remove/Install Components - Shown On Model 231

Courtesy of MERCEDES-BENZ USA

	Remove/install
	Risk of injury  to skin or eyes from hydraulic fluid spraying out under pressure. Risk of poisoning  from swallowing hydraulic fluid.	Depressurize hydraulic system completely before starting any work on it. Wear protective clothing and safety glasses.	AS00.00-Z-0013-01A
	Risk of injury  caused by body parts being trapped or crushed when working on a partially open Vario roof (in stop mode) or in its closing area as a result of the Vario roof suddenly collapsing	Secure Vario roof with a suitable special tool.	AS77.50-Z-0001-01A
	Risk of death  caused by parts conducting high voltage	Do not touch live parts. Persons who carry electronic implants (e.g. cardiac pacemakers) must not  perform any work on high-voltage on-board electrical systems.	AS77.00-Z-0001-01A
	Notes on MAGIC SKY CONTROL		AH77.00-P-0001-01A
	Notes on Vario roof assembly work		AH77.30-P-0002-01R
1	Remove paneling (2) from Vario roof front section (3)	Vario roof is closed.
2	Release front locks (5)	Actuate vario roof actuation switch (S84s1) inn the open direction until the front locks (5) are unlocked and the vario roof front section (3) still makes contact with the crossmember above windshield.
3	Unscrew bolts (4) and remove left or right front lock (5) from vario roof front section (3)	Do not remove both front locks (5) simultaneously. Always ensure that an installed and adjusted front lock (5) remains on the vario roof front section (3). Otherwise adjustment of the front lock (5) is significantly more difficult. Do not kink hydraulic lines (12) Otherwise the hydraulic lines (12) can be damaged. Allow front lock (5) to hang down on electrical line and hydraulic lines (12). Observe installation location of spacers (6).
4	Insert 6 mm Allen wrench through rear lining into emergency opening valve (7)	MODEL 172.40 A corresponding slot is present behind the pocket (8) through which the emergency opening valve (7) is accessible.
5	Open emergency opening valve (7) and leave open	MODEL 172.4 Open emergency opening valve (7) max. 2 turns. Otherwise the Vario roof control hydraulic unit (A7/5) can be damaged.
		Emergency operation valve at hydraulic unit	*BA77.37-P-1001-01A
6	Open emergency opening valves (13) on vario roof control hydraulic unit (A7/5) and leave open	MODEL 231 Open emergency opening valve (7) max. 1 turn. Otherwise the Vario roof control hydraulic unit (A7/5) can be damaged. Pressure is relieved from hydraulic system.
		Emergency operation valve at hydraulic unit	*BA77.37-P-1001-01A
7	Remove safety clips (9) and bolts (10, 11) and remove front lock hydraulic cylinder (1) from front lock (5)	Do not kink hydraulic lines (12). Otherwise the hydraulic lines (12) can be damaged. When installing a new front lock hydraulic cylinder (1), pull out piston rod (14) so that bolt (11) can be installed when the front lock (5) is released. Ensure that the piston rod (14) is not pulled too far out, because it cannot be pushed back into the front lock hydraulic cylinder (1) without difficulty.
8	Mark connection location of hydraulic lines (12) on front lock hydraulic cylinder (1)	The hydraulic lines (12) are marked. There are no marks on the front lock hydraulic cylinder (1).
9	Remove hydraulic lines (12) from front lock hydraulic cylinder (1)	Vehicle interior must be covered. Otherwise the vehicle interior can be soiled with hydraulic fluid running out. 2 hydraulic lines (12) are connected to the left front lock hydraulic cylinder (1) and 4 hydraulic lines (12) to the right front lock hydraulic cylinder (1). Replace sealing rings at connections and coat with hydraulic oil. For this purpose us refill bottle. It is filled with the required hydraulic oil and is available as replacement part.
10	Plug connections on hydraulic lines (12)	Record plug	Figure
11	Install in the reverse order
12	Check oil level Vario roof actuation hydraulic unit (A7/5), correct if necessary	MODEL 231	AR77.37-P-3501RK
		MODEL 172.4	AR77.37-P-3501W

Fig 4: Identifying Record Plug (129 589 00 91 00)

Courtesy of MERCEDES-BENZ USA