Citytrac 4200
Citymaster 1200
Citycleaner
Service Documents
For internal use only
Status
March 2009
Page
43 of 108
5.3.2 Differential locking valve
The volume flow supplied from the hydraulic pump for forward drive is fed to the differential locking valve (P) (Pos. 216).
When (Y11) is not is its active state, it is possible to bypass the current divider and distribute the current to the wheel motors (A,B,C)
as required.
Comment:
It is only possible to activate the differential lock valve
(Y11 energized)
in “work ride / four-wheel” mode.
If the differential locking valve is activated (Y11 energized), the solenoid valve interrupts the outflow of the feed pressure to the tank
and the distributing valve is actuated hydraulically.
The differential locking valve is basically comprised of two double-action current dividers, (dividing and accumulating) and a
distributing valve to optionally bypass the current divider.
When activated, the hydromotors are automatically switched parallel and the three outputs of the current divider are supplied with a
load-independent component current, according to the proportions selected.
This ensures that, in the event of unfavourable ground conditions, the maximum pump pressure is applied at the blocked wheel.
Two compensation nozzles, arranged between the outputs A, B and C enable a certain partial compensation and prevent the wheels
distorting.
Part distribution:
A: 50% drive, rear-wheel
B: 25% drive, front right
B: 25% drive, front left