Section 3

GM K I I S yst e m Pneumatics TRAINING INSTITUTE

Air Schematic Layout

Compressor runs continuously

8.1 Bar

Purge Tank

GMK Equipped with Mercedes Engine

Compressor runs intermittently

GMK Equipped with Cummins Engine

8.1 Bar

Purge Tank

Valid since approx. 1998

8.1 Bar

Compressor

Pressurizing Air Dryer System &toUnloader 8.1 Bar

Purge Tank

To Tanks and Air System

8.1 Bar

Compressor

Backflush At 8.1 Bar Unloading the Filter and Occurs Dryer

Purge Tank

To Tanks and Air System

21

6.0 Bar

5.5 Bar

23

Input Air 18 x 2 From Air Dryer

1

24 5.5 Bar

6.0 Bar

22

GMK5160 Air Tank Distribution

V2 100 L

V4 10 L

V3 60 L

V1 40 L

V1 40 L

21

6.0 Bar

5.5 Bar

23

Input Air 18 x 2 From Air Dryer

1

24 5.5 Bar

6.0 Bar

22

IfMaxi Braking Circuit V2 If Auxiliary Circuit V4 Brake Circuit V3 If If Main Brake #1 Circuit V1 ruptures or fails ruptures or fails ruptures or fails ruptures or fails the the line pressure will theline linepressure pressurewill will the line pressure will fall to 6 Bar fall to 5.5 Bar fall Bar fallto to5.5 6 Bar

V2 100 L

V4 10 L

V3 60 L

V1 40 L

V1 40 L

Pedal Pressure Down

S20 5.5 Bar

12 x 1,5 V1

Low Volume Air Signals the Brakes

V2

V2 100 L

V1 40 L

12 x 1,5 5.5 Bar

S21 High Volume Air Activates the Brakes

GMK 5160 Axle #1 Braking Circuit

Axle 1

Pedal Pressure Released

S20 5.5 Bar

12 x 1,5 V1 V2

V2 100 L

12 x 1,5

Low Volume Air Signals to release the Brakes

5.5 Bar

S21 High Volume Air is blocked and awaits further activation

Axle 1

GMK 5160 Axle #1 Braking Circuit

V1 40 L

TRAINING INSTITUTE

Relay Valve

Relay Valve Cluster Located looking up from underneath. Central part of Carrier

Pedal Pressure Down

S20 5.5 Bar

12 x 1,5 V1 V2

Low Volume Air Signals the Brakes

V2 100 L

12 x 1,5 5.5 Bar

S21 High Volume Air Activates the Brakes

Axle 2

GMK 5160 Axle #2 Braking Circuit #1

V1 40 L

Pedal Pressure Released

S20 5.5 Bar

12 x 1,5 V1 V2

V2 100 L

V1 40 L

12 x 1,5

Low Volume Air Signals to release the Brakes

5.5 Bar

S21 High Volume Air is blocked and awaits further activation

GMK 5160 Axle #2 Braking Circuit #1

Axle 2

Pedal Pressure Down

S20 5.5 Bar

Braking Circuit #2 12 x 1,5

V1 V2

12 x 1,5

V2 100 L

V1 40 L

V1 40 L

5.5 Bar

S21

Axle #3

Axle #4

Axle #5

S20 Pedal Pressure Released

5.5 Bar

Braking Circuit #2 12 x 1,5

V1 V2

12 x 1,5

V2 100 L

V1 60 L

V1 40 L

5.5 Bar

S21

Axle #3

Axle #4

Axle #5

12 x 1,5

GMK GMK 5160 5160 Maxi Brake Maxi Brake Circuit Spring Axle #2 Engaged Released Low Volume Air Vents to Atmosphere

High Volume Air is blocked and awaits further activation

Axle 2

High Volume Air Releases the Maxi Brakes

V3 60 L

12 x 1,5

Low Volume Air Signals the Brakes

GMK 5160 Maxi Brake Engaged Axle #2 Released

V3 60 L

High Volume Air Releases the Maxi Brakes Axle 2

Low Volume Air Vents to Atmosphere

Axle #3

12 x 1,5

GMK When High Air Volume is5160 blocked Air Maxi Brakes Released Axles #3, #4 &-#5 Maxi is Brakes Blocked Engage and with High Volume Air Maxi Brake Circuit awaits with Spring furtherTension activation

Axle #4

Axle #5

V3 60 L

Low Volume Air Signals the Brakes to release

12 x 1,5

Spring Tension Maxi Released MaxiBrakes Brake Engaged is overpowered with Volume Air withHigh Spring Tension with High Volume Air

Axle #3

V3 60 L

Axle #4

V1 40 L

Axle 2

Axle #5

V1 40 L

Anti-Compounding Valve

V3 60 L

Air Schematic Layout Air Solenoids and Functions We now will examine, when the air solenoids are fired and which functions they activate.

TRAINING INSTITUTE

Air Solenoid Bank

Air Solenoid Valve Bank Cluster Located with right side of carrier above outrigger box