5-120 BA 35203_04 * 3.0 * 35203_04_05_Bedienung.fm
5 Operation
Coupling compressed-air hoses (dual-circuit braking system)
1. After locking the trailer onto the ball hitch: First couple the
compressed-air hose onto the yellow compressed-air coupling B, then
the compressed-air hose onto the red compressed-air coupling A
2. On the trailer: open the lever of the trailer brake-power controller.
Uncoupling compressed-air hoses (dual-circuit braking system)
Danger of accident due to trailer rolling away!
Can cause serious injury or death.
► Follow the chronological order described for uncoupling the pressure
hoses!
1. Stop the machine.
2. Apply the parking brake.
3. Stop the engine and remove the starting key.
4. On the trailer: set the lever of the trailer brake-power controller to the
corresponding position (empty, half empty, full load).
5. Uncouple the compressed-air hose on the red compressed-air
coupling A (reservoir), then the compressed-air hose on the yellow
compressed-air coupling B (brake).
6. Couple the compressed-air hoses on the brackets on the trailer.
Checking the compressed-air supply
Danger of accident due to low air pressure!
The compressed-air braking system does not have enough braking effect
at an air pressure below 5 bar (73 psi). Can cause serious injury or death.
► Before starting machine travel with a trailer hitched, the system
pressure must read at least 6 bar (87 psi) in the digital display J.
► Indicator light 77 must have gone out.
► Stop the machine immediately if the air pressure drops below 5 bar (73
psi) during machine travel.
► Have the cause for the pressure loss immediately repaired by an
authorized service center.
1. Let the diesel engine run at machine standstill until the compressed-air
braking system is filled. Specified value: 6 – 8 bar (87 – 116 psi)
2. Perform a brake test.
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