Long 460 - Page 81

['
CX>
0
SP SR
s
Fig. 42 - Hydraulic fluid cir culation diagram
A. Engine is running and tractor moving straight forward .
B. Pressure valve opens - at extreme pressure (e.g.: when direction cannot be changed on account of a blocked
wheel).
C. Return valve opens - at
change of direction , when engine is stalling or hydraulic pump defective .
P -
pump; R - reservoir; S - servo-steering cylinder; SP - pressure valve; SR - return valve.