Remove/install pressure regulating unit

AR47.60-P-0028RFW

06.12.2018

Engine

780 in model 253.992/993

P47.60-A023-09

1	plug-in coupling	4	High-pressure line union nut	Y138/1	Shutoff valve 1
2	Electrical connector	5	Bolts
3	Electrical connector	6	Pressure control unit

P47.60-2096-09

6	Pressure control unit	B72/18	Mean pressure sensor
7	Bolts	Y138/1	Shutoff valve 1
8	Vent pipe

S7	High-voltage disconnect device

P54.10-4350-10

P54.10-4110-09

 Danger	Risk of explosion caused by escaping hydrogen or overheating of the fuel tanks when working on the hydrogen system. Risk of frostbite to body parts caused by escaping gas and by touching component parts carrying gas when emptying fuel tanks. Risk of asphyxiation caused by inhalation of air diluted by hydrogen. Risk of burn injuries by coming into contact with an invisible pale blue hydrogen flame.		AS00.00-Z-0030-01B
Topical note	Notes on fuel cell system		AH00.00-P-0022-01RFW
Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Notes on safety-relevant components		AH00.00-Z-0019-01A
 	Remove/install
1	Release pressure in fuel cell system with vehicle diagnosis system.		AR06.00-P-1001RFW
2	Manually release the pressure in the fuel cell system.	If the diagnosis-based pressure release cannot be performed.
			AR06.00-P-1000RFW
3	Ensure that the requirements for driving into the workshop are fulfilled.
Topical note	Requirements for driving into the workshop		AH00.00-P-0021-01RFW
4	Print out "tank system, fuel cell, form event log," fill out, and attach to the vehicle somewhere clearly visible.
	Tank system event log, fuel cell, form		OF00.00-P-3000-21RFW
5	Activate high-voltage disconnect device (S7), as shown in picture sequence (A, B, C), and lock it with a shackle-type lock.	 Installation: Carefully connect high-voltage disconnect device (S7), as show in picture sequence (D, E, F). Otherwise the high-voltage disconnect device (S7) will be damaged.
		 For the electrical interruption of the tank components.
		 Keep the key for the shackle-type lock of the high-voltage disconnect device (S7) in a separate location accessible to authorized personnel only.
		 Installation: Check high-voltage disconnect device (S7) for damage.
		If damage is present,
		
		Remove contacts from coupling housing of high-voltage disconnect device (S7) and replace high-voltage disconnect device (S7).
		Remove/install contacts from coupling housing of high-voltage disconnect device.	AR00.19-P-0120-31A
		 New passenger car wiring harness repair kit	*220589049900
		 Unlocker with ejector MLK 1.2_plug	*220589019925
		 Wiring harness repair kit, basic	*000589139900
6	Remove transmission tunnel and center left underfloor paneling.		AR61.30-P-1001RFW
		 Installation: Do not install underfloor paneling until after the leak test has been performed.
7	Release and disconnect the plug-in coupling (1) on shutoff valve 1 (Y138/1) of the pressure regulating unit (6).		AR47.60-P-0032RFW
8	Check the hydrogen content in the area of the shutoff valve 1 (Y138/1) and the pressure regulating unit (6).
	000 588 03 21 00 Gas detector		WS47.00-P-0019B
		 specified value under 100 ppm.
		 Wear suitable protective gloves.
9	Disconnect electrical connectors (2, 3).
10	Unscrew union nut of high-pressure line (4) on the pressure regulating unit (6).	 Union nut, hydrogen line to gas distributor/pressure regulating unit	*BA47.60-P-1019-01B
11	Remove screws (5).	 Bolt, pressure regulating unit to holder	*BA47.60-P-1020-01B
12	Take out the pressure regulating unit (6) with shutoff valve 1 (Y138/1).
13	Unscrew screws (7).	When replacing the pressure regulating unit (6).
		 Bolt, vent tube to pressure regulating unit	*BA47.60-P-1023-01B
14	Seal open lines and connections.	 Set of protective caps	*001589009100
		 Record plug	*129589009100
15	Take the vent pipe (8) out of the pressure regulating unit (6).	When replacing the pressure regulating unit (6).
		 Installation: Check O-ring for correct seat and damage.
		If there is a problem,
		
		Position the O-ring correctly or replace the O-ring.
16	Convert the shutoff valve 1 (Y138/1) on the pressure regulating unit (6).	When replacing the pressure regulating unit (6).
			AR47.60-P-0015RFW
17	Convert medium pressure sensor (B72/18) on the pressure regulating unit (6).	When replacing the pressure regulating unit (6).
			AR47.60-P-0014RFW
18	Install in the reverse order.
19	Perform fuel system leak test.		AR47.60-P-0001RFW

 Tank system

Number	Designation		Engine 780 in model 253.992/993 with code ME02 (Fuel cell)
BA47.60-P-1019-01B	Union nut, hydrogen line to gas distributor/pressure regulating unit	Nm	20