6
-
27
42hw-201601
Chapter 6 hydrauliC system
6
3015r(h)/3515r(h)/4015r(h)/F36r(h)/F42r(h) traCtOr
liFtiNG (rapid liFtiNG)
▶
The unload valve is applied with the pilot pressure (a) and (b) so it is closed by the spring force. as the
pressure in the pump rises, oil flows through the flow passage in the spool and opens the load check valve to
flow into the cylinder (rapid lifting). The mechanical check valve is kept closed.
(1) Safety valve
(2) Slow return valve
(3) Load check valve
(4) Mechanical valve
(5) Main spool
(6) Unload valve
(7) Oil tank
4
b
7
3
5
6
a
1
2
⫰ㆣ⪣#⫝̸ᜤ
⥯⫇⪣#㪛
�25W624a
Operation
Oil flow
Summary of Contents for 3015h
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