6
-
45
42hw-201601
Chapter 6 hydrauliC system
6
3015r(h)/3515r(h)/4015r(h)/F36r(h)/F42r(h) traCtOr
K25W664a
4.10.8 maiN relieF valve
The setting pressure of the main relief valve is 380 kgf/cm2 (37.2 MPa) to protect the internal circuit in case of
HST overload.
When the main relief valve is activated during forward or reverse driving, oil in the high-pressure side circuit is
delivered to the low-pressure side circuit to prevent damage of the internal circuit due to load.
On the other hand, oil supplied by the charge pump is sent to the low-pressure circuit through the check valve
on the neutral valve side.
+⭏ⴏ,
Sj5#便
+㨏ⴏ,
W
E
Sj4#俀
Sj5#便
Sj4#俀
a42W617B
High pressure line
Main
relief
valve
Low pressure line
HST
Pump
Check
valve
Charge relief valve
HST
Motor
Check
valve
(Forward)
(Reverse)
Summary of Contents for 3015h
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