10-8
C. AUXILIARY SERVICES AND LUBRICATION CIRCUIT
FUNCTION
The auxiliary services circuit sends oil under pressure to the control valves used to control implements and the rear lift. This
circuit also provides oil for lubrication of the secondary shaft and the optional trailer braking and front axle suspension cir-
cuits.
OPERATION
The gear pump (1) draws in oil (through filter (2)) from the rear gearbox and sends it under pressure to the filter (3) and to the
variable displacement pump (4).
The oil is also used for lubrication of the secondary shaft (5); valve (6), (setting 1.5 bar (21.7 psi)) prevents excessive pres-
sure in the lubrication circuit on cold starting and in very cold climatic conditions.
The pump (4) sends oil under pressure to the auxiliary service control valves (7), to the lift control valve (8) and to the ex-
hauster (9). The oil sent to the exhauster (9) passes through a flow control valve (10), which limits the flow rate to a maximum
of 5
/min (1.321 US.gpm).
On tractors equipped with the trailer braking valve (11), this valve receives oil from the pump (4) with priority over the other
control valves, whereas on tractors equipped with front axle suspension (12), the front axle suspension control valve re-
ceives oil in parallel with the auxiliary services control valves (7).
D0003150
1
2
3
4
5
6
7
8
9
10
11
12
REAR GEARBOX
FRONT GEARBOX
HYDRAULIC SYSTEM
