Manitowoc Grove GMK4100L-1 Operating Manual page 224

Driving
5.1 Before driving
Supply pressure
G
5 - 10
The brake system and some consumers (e.g. differential locks, driver's seat,
etc.) require sufficient supply pressure in order function properly.
•
Check that the supply pressure is about 8 bar (116 psi).
If the supply pressure is too low, such as after repairs, you can build it up as
follows.
Building up supply pressure
•
Check that the parking brake is applied.
Risk of accidents by truck crane moving unintentionally
Make sure that the lever is pointing to the rear before building up the supply
pressure.
This prevents the parking brake releasing as soon as sufficient pressure is
available and the truck crane moving unintentionally.
•
Allow the engine to run. The supply pressure builds up and you can speed
up this process by pressing the accelerator.
The light (1) turns off once the supply pressure reaches about 5.5 bar (80 psi).
•
Refill the supply pressure until
– about 8 bar (116 psi) is reached and
– a valve audibly discharges pressure.
There is now sufficient supply pressure.
3 302 690 en Operating manual
GMK4100L-1