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CHAPTER 6 HYDRAULIC SYSTEM 3015R(h)/3515R(h)/4015R(h)/F36R(h)/F42R(h) TRACTOR
LIFTING (LOW-SPEED LIFTING)
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As the hydraulic lift is lifted, the feedback link is moved to push the main spool closer to the neutral position.
Then,themechanicalvalveopenslightlyandtheoilowofmainspooltoreturnoilbacktothetank.Butthe
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