Checking service pressures on four-circuit protection valve · ar4260l0040c · Mercedes-Benz WIS

AR42.60-L-0040C

Checking service pressures on four-circuit protection valve

6.7.09

MODEL 668 /
with CODE (B16) Hydraulic 2-circuit / compressed air 2-circuit brakes
with CODE (B43) 2-line trailer brake (EC)
with CODE (CE2) Rear air suspension

MODEL 670 /
with CODE (B16) Hydraulic 2-circuit / compressed air 2-circuit brakes
with CODE (B43) 2-line trailer brake (EC)
with CODE (CE3) Front and rear air suspension

Checking service pressures on four-circuit protection valve

L42.60-0056-01

L42.60-0059-01

W42.25-0020-01

4.03 Four-circuit protection valve

35.02 Supply coupling head, test connection circuits 3 and 4

35.03 Brake coupling

6.13 Compressed air drier with integrated pressure regulator

L42.60-0057-01

H1 Test connection (circuit 1)

H2 Test connection (circuit 2)

H3 Test connection (air suspension system)

L42.60-0058-01

	Checking
	Notes on four-circuit protection valve		AH42.60-N-0001-01A
1	Connect test kit	 Connect test kit between test connection (air suspension system) (H3) and safety valve, to supply coupling head test connection circuit 3 and 4 (35.02), to test connection (circuit 1) (H1) as well as test connection (circuit 2) (H2).	*360589002100
		Test kit	*360589002100
2	Fill brake system with compressed air until pressure governor switches off		*BE42.10-N-1001-10C
		Test kit	*360589002100
3	Check operating pressure of service brake circuits 1 and 2		*BE42.10-N-1003-10C
		Test kit	*360589002100
		 Brake pedal winch	*000589183100
		 If the operating pressure deviates from the specified value:
		Set operating pressure for brake circuits 1 and 2	AR42.60-L-0040-01C
		If the setting range of the overflow valves for circuits 1 and 2 at the four-circuit protection valve (4.03) is not sufficient:
		Check compressed air drier with integral pressure regulator (6.13).	AR42.60-L-0010A
		If operating pressure exceeds specified value:
		Check safety valve
		If operating pressure is below specified value:
		Check compressed-air system for leaks	AR42.60-L-0001-01A
		Check delivery rate of air compressor	AR13.30-L-1001A
		Check pressure relief valve of steering
4	Check operating pressure of auxiliary consumer circuits 3 and 4		*BE42.10-N-1004-10C
		Test kit	*360589002100
		 Brake pedal winch	*000589183100
		 If the operating pressure deviates from the specified value:
		Set operating pressure for brake circuits 3 and 4	AR42.60-L-0040-02C
		If the setting range of the overflow valves for circuits 3 and 4 at the four-circuit protection valve (4.03) is not sufficient:
		Check compressed air drier with integral pressure regulator (6.13).	AR42.60-L-0010A
		If operating pressure exceeds specified value:
		Check safety valve
		If operating pressure is below specified value:
		Check compressed-air system for leaks	AR42.60-L-0001-01A
		Check delivery rate of air compressor	AR13.30-L-1001A
		Check pressure relief valve of steering
5	Check safety pressure of circuits 1 to 4	 Simulate pressure loss (defect) in one of the brake circuits with approx. 0 bar. If the securing pressure of the other brake circuits deviates from the specified value:	*BE42.10-N-1006-10C
		The four-circuit protection valve (4.03) must be replaced.
		The test must be repeated for each brake circuit.
		Test kit	*360589002100
6.1	Check safety function of the four-circuit protection valve (4.03)	Only for Knorr four-circuit protection valve.
		 Simulate pressure drop in circuit 21, in the process the four-circuit protection valve (4.03) must blow off audibly.
		 The characteristics of this four-circuit protection valve (4.03) are that for a pressure drop in circuit 21 as of 4 bar (+ 0.5 bar) circuit 23 is vented to the atmosphere.
7	Check that four-circuit protection valve (4.03) fills circuits 1 and 2 as a priority.	 Bleed brake circuits 1 to 4 below the specified safety pressure If brake circuits 1 and 2 are not filled as a priority: 	*BE42.10-N-1006-10C
		The four-circuit protection valve (4.03) must be replaced.
		Test kit	*360589002100
8	Disconnect test kit	 Detach test kit between the test connection (air suspension system) (H3) and safety valve, to supply coupling head test connection circuit 3 and 4 (35.02), to test connection (circuit 1) (H1) as well as to test connection (circuit 2) (H2).
		Test kit	*360589002100

Test and adjustment values for service brake

Number	Designation		Model 668, 670 with code B16 CE2/CE3 with Paul air suspension up to VIN 076160	Model 668, 670 with code B16 CE2/CE3 with MB air suspension as of VIN 076161 up to VIN 123600	Model 668, 670 with code B16 CE2/CE3 with MB air suspension as of VIN 123601 up to VIN 131964


BE42.10-N-1001-10C	Cut-off pressure	bar	10,2	12,3	12,3
BE42.10-N-1003-10C	Operating pressure of service brake circuit 1 and 2	bar	8 (0.2)	8 (0.2)	8.5 (-0.4)
BE42.10-N-1004-10C	Operating pressure, auxiliary consumer circuits 3 and 4	bar	8 (0.2)	8 (0.2)	8.5 (-0.4)
BE42.10-N-1006-10C	Securing pressure circuits 1-4 (with replenishment in intact circuits, defective circuit 0 bar)	bar	6.8	6.7	>5,5

Test and adjustment values for service brake

Number	Designation		Model 668, 670 with code B16 CE2/CE3 with MB air suspension as of VIN 131965 up to VIN 134642	Model 668, 670 with code B16 CE2/CE3 with MB air suspension as of VIN 134643


BE42.10-N-1001-10C	Cut-off pressure	bar	12,3	12,3
BE42.10-N-1003-10C	Operating pressure of service brake circuit 1 and 2	bar	8.4	8.4
BE42.10-N-1004-10C	Operating pressure, auxiliary consumer circuits 3 and 4	bar	8.4	8.4
BE42.10-N-1006-10C	Securing pressure circuits 1-4 (with replenishment in intact circuits, defective circuit 0 bar)	bar	>5,5	>5,5

000 589 18 31 00

Brake pedal jack

Test kit

360 589 00 21 00

Henviste dokumenter

ah4260n000101a Oplysninger om firekredsbeskyttelsesventil
ar1330l1001a
ar4260l000101a
ar4260l0010a
ar4260l004001c
ar4260l004002c