9 HYDRAULIC LIFT UNIT
9 HYDRAULIC LIFT UNIT
EF494T TM 06/2011 edition
182
9.1.3
Control valve
Operate the spool according to the control lever
position to allow the lift arm to be put in the
"neutral," "up" or "down" position.
(1)
Unload valve
Prevents the oil temperature from rising
excessively.
(2)
Flow control valve
Reduces shock when the lift arm is at its
highest position.
(3)
Mechanical check valve
Prevents the implement from being
lowered. This valve allows oil to escape
from the cylinder when the lift arm is in the
"down" position.
(4)
Load check valve
Prevents back flow.
(5)
Main spool
Switches between the circuits used for
changing the lift arm positions ("neutral,"
"up," and "down").
9.1.4
Relief valve
If the pressure in the hydraulic circuit becomes
excessively high, this valve will open to allow oil
to escape to the tank.
The pressure setting of the valve can be adjusted
by increasing or decreasing the size of shims.
Relief pressure setting:
16.7±17.4 MPa (170-178 kgf/cm
2
)
(A) From the hydraulic pump
(B) To the tank
(C) Pressure adjustment shims
(D) Relief valve mechanism
Summary of Contents for EF-494T
Page 1: ...EF494T TM 06 2011 edition ...
Page 85: ...3 ENGINE 3 ENGINE EF494T TM 06 2011 edition 77 3 ENGINE ...
Page 88: ...3 ENGINE 3 ENGINE EF494T TM 06 2011 edition 80 B Return ...
Page 126: ...4 CLUTCH 4 CLUTCH EF494T TM 06 2011 edition 118 4 CLUTCH ...
Page 130: ...4 CLUTCH 4 CLUTCH EF494T TM 06 2011 edition 122 ...
Page 133: ...5 TRANSMISSION 5 TRANSMISSION EF494T TM 06 2011 edition 125 5 TRANMISSION ...
Page 167: ...7 FRONT AXLE 7 FRONT AXLE EF494T TM 06 2011 edition 159 7 FRONT AXLE ...
Page 169: ...7 FRONT AXLE 7 FRONT AXLE EF494T TM 06 2011 edition 161 7 2 CROSS SECTION VIEW ...
Page 176: ...8 POWER STEERING 8 POWER STEERING EF494T TM 06 2011 edition 168 8 POWER STEERING ...
Page 234: ...11 APPENDIXES 11 APPENDIXES EF494T TM 06 2011 edition 226 11 APPENDIXES ...
Page 235: ...11 APPENDIXES 11 APPENDIXES EF494T TM 06 2011 edition 227 11 1 HYDRAULIC CIRCUIT DIAGRAM ...
Page 236: ...228 11 2 ELECTRICAL CIRCUIT DIAGRAM 11 2 1 WIRING HARNESS ...
Page 238: ...230 11 2 3 ELECTRICAL WIRING DIAGRAM ...
Page 239: ......