Automatic load-dependent brake - check play and adjustment

AP42.80-B-4263A

Automatic load-dependent brake - check play and adjustment

12.03.2020

Model

688 with engine 374.977, 904.918/919/924/957

Model

688 with engine 374.977

Model

688 with engine 904.924

Model

693 with engine 904.925

Model

695 with engine 457.911

with code MS5 (BlueTec 5)

Model

695 with engine 457.914

Model

696 with engine 457.923/924/931



Check

1

Check that the automatic regulator lever moves smoothly

2

Determine the load on the rear axle with the vehicle in operating condition, unladen

 Determine the load on the rear axle on a weighing scale.

3

Install the testing briefcase



.

AR42.80-B-0050-01A

 Test kit

*360589002100

4

Charge the compressed air reservoir

.Maximum operating pressure

*BE42.80-B-1001-01J

.Pressure regulator

*BE42.60-B-1001-01A

5

Check the setting for the vehicle



Test without load

.

AR42.80-B-0050-02A



Test with half load

.

AR42.80-B-0050-03A



Test with full load

.

AR42.80-B-0050-04A

 Check the length of the lever.

.Rod length (adjustment)

*BE42.80-B-1003-01J

.Output pressure (portico 2) and the rod travel according to the load on the rear axle

*BE42.80-B-1002-01J

.Pressure regulator

*BE42.60-B-1001-01A

6

If the setting pressure indicated on the ALB label is not reached, adjust the automatic brake regulator in relation to the load

 If the pressure values found on the control without load are correct, the pressure values for any load situation of the vehicle should also be correct.

Pneumatic brake system

Number

Designation

Chassis 368.00/05/10/11/15; 382.07/08/11/12/15/17/18; 384.06/07/11/14/20/22/31/33; 634.001/011/012/014/061/071/081; 693.02/10/12/14/15/17/18/19/34/38; 694.00/02/04; 695.01/02/03/04/05; 695.30; 696.08/09; 696.36

Chassis 364, 384.08/09, 386, 388, 397, 660, 664, 682, 688

BE42.60-B-1001-01A

Pressure regulator

Opening pressure - Wabco/Knorr

bar

9,8 ... 10,2

7,9 ... 8,3

Closing pressure - Wabco/Knorr

bar

8,7 ... 9,3

6,9 ... 7,7

Service pressure - Wabco/Knorr

bar

13

12

Opening pressure of safety valve - Wabco/Knorr

bar

14,5 ... 17,0

12,0 ... 15,0

Tires filling safety valve opening pressure - Wabco

bar

-

9,0 ... 13,0

Admissible leakage - Wabco/Knorr

bar (menor ou igual cm3)

10

10

Pressure on the test stand feeding circuit - Wabco/Knorr

bar

15

10

Pressure applied to the port 1 for leak test - Wabco/Knorr

bar

10

7

Pressure applied on the port 21 for leak test - Wabco/Knorr

bar

10

7

Regulator-ALB

Number

Designation

Type 688.277 with rear spring A 688 320 77 06

BE42.80-B-1001-01J

Maximum operating pressure

Bar

8

Regulator-ALB

Number

Designation

Type 688.277 with rear spring A 688 320 77 06

BE42.80-B-1002-01J

Output pressure (portico 2) and the rod travel according to the load on the rear axle

Load of:

0 Kg

Outlet pressure

Bar

2,0

400 Kg

Outlet pressure

Bar

2,5

800 Kg

Outlet pressure

Bar

3,0

1200 Kg

Outlet pressure

Bar

3,5

1600 Kg

Outlet pressure

Bar

4,0

2000 Kg

Outlet pressure

Bar

4,6

2400 Kg

Outlet pressure

Bar

5,8

2800 Kg

Outlet pressure

Bar

6,0

3200 Kg

Outlet pressure

Bar

6,0

Regulator-ALB

Number

Designation

Type 688.277 with rear spring A 688 320 77 06

BE42.80-B-1003-01J

Rod length (adjustment)

Bar

100