Hyundai R 160 LC-3, Service Manual

Page: 90 / 459

2-61
Function of relief
Figure illustrates how the pressure acting
on the relief valve is related to its rising
process. Here is given the function,
referring to the figure following page.
RELIEF VALVE
1 Poppet
2 Poppet seat
3 Spring seat
4 Spring
5 Plug
6 O-ring
7 Shockless piston
8 Adjust screw
9 Nut
10 Spring guide
11 O-ring
12 Back up ring
13 O-ring
14 Back up ring
15 O-ring
3)
Construction of relief valve
(2)
The release valve determines the drive force and the brake force of the machine during running
and is mounted to the cross line. The relief valve is provided with a shockless function to relieve
shocks that may be generated at the beginning of acceleration and deceleration.
a) Differential area type interlocking relief valve
b) It consists of a shockless piston.
As explained above, the relief valve functions in the following two stages when the control valve is
operated to drive or brake the piston motor.
13,14
2 1 3 4 6 5 8 9
7 11,12 10 15
Piston stroke
Pressure
P
2
P
1
1 step
2 step
Time
(1)