6
-
28
42hw-201601
Chapter 6 hydrauliC system
3015r(h)/3515r(h)/4015r(h)/F36r(h)/F42r(h) traCtOr
liFtiNG (lOw-speed liFtiNG)
▶
as the hydraulic lift is lifted, the feedback link is moved to push the main spool closer to the neutral position.
Then, the mechanical valve open slightly and the oil flow of main spool to return oil back to the tank. But the
majority of oil is led into the cylinder to reduce shock occurred by lifting operation.
(1) Safety valve
(2) Slow return valve
(3) Load check valve
(4) Mechanical valve
(5) Main spool
(6) Unload valve
(7) Oil tank
4
5
b
7
3
6
a
1
2
⫰ㆣ⪣#⫝̸ᜤ
⥯⫇⪣#㪛
�25W625a
Operation
Oil flow
Summary of Contents for 3015h
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