Yanmar YM240 Service Manual Download | Manualshive

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Summary of Contents for YM240

Page 1: ...DIESEL TmACTQm HYDRAULIC DEVICE ...

Page 2: ...e Iift arm 5 4 Lowering the lift arm 7 5 Control valve in the neutral position a Lift arm fuIly raised 9 b Lift arm fully lowered 11 6 Relief valve a Work under normal conditions 13 b Work under a sudden shock 15 7 Use of implements a For outlet B 17 b For outlet A B 19 8 Trouble shooting 21 ...

Page 3: ...g b Single cylinder double action Outlet A Hydraulic cylinder Implement Relief valve J Dumping c Two cylinder double action Outlet A Hydraulic control valve _ 1 1 R m i r Lifting n Hydraulic cylinder B1 Hydraulic cylinder A d Single cylinder single action S O V I V C Reservoir stop valve I M Implement strainer Hydraulic pump Stop valve Control valve I m kCylinder Engine Implement Relief valve I SI...

Page 4: ...s m The hydraulic device employs high precision parts so if the hydraulic fluid is dirty or contains foreign matter the efficiency of the device will be greatly impaired When assembling or disassembling the hydraulic device always follow the procedure described in the service manual a Before operating always check the level of the hydraulic fluid If it is low tefill to the level marked on the dips...

Page 5: ...The following cross section 05 the PV3 positioning control valve is used for the model YM240 tractor I Relief valve j d r a u l i c oil cylinder case ...

Page 6: ...3 Raising the lift arm 1 Low pressure pipe 5 Reservoir ...

Page 7: ...tral Lift arm is lowered position closing the circuit and the fluid in the Explanation Refer to the diagram cylinder stops flowing I Fluid supplied by the pump flows through the control valve and return to the reservoir Note 2 The weight of the implement pushes the piston The speed of the implement s descent is controlled and drives away the fluid in the cylinder through by the opening of the slow...

Page 8: ...ntrol valve in the neutral position a Lift arm fully raised Condition Lift arm is at its highest position Control lever is in the rear position Control valve is in the neutral position Pressure in cylinder ...

Page 9: ...ve in the neutral position b Lift arm fully lowered Condition Lift arm is at its lowest position Control lever is in the rear position Control valve is in the neutral position Low pressure flow Pressure in cylinder ...

Page 10: ...a Work under normal coditions I Low pressure pipe Reservoir r j Low pressure flow w Q G c High pressure Pressure in cylinder ...

Page 11: ...may relief valve always leave the stop valve open as shown be caused by a sudden shock applied to the lift arm in the diagram when driving the tractor with an for example when driving over rough roads When implement mounted the pressure exceeds the allowable pressure the relief valve opens to prevent damage to the pipes etc Hydraulic pressure outlet A Shim for pressure Reservoir Low pressure flow ...

Page 12: ...7 Useof implements a For outlet B Lift Up Neutral r l sl Lift Down 1 I Low pressure pipe Reservoir Pressure in cylinder ...

Page 13: ...he control valve attached to outlet A should be a five ports and three actions type as shown in the diagram When this valve is used make sure that the tank port is connected directly to the reservoir Note To protect the hydraulic circuit never drive the tractor fast with both front and rear implements attached ...

Page 14: ...Open the valve Replace ltern Stop valve Piston Spool Return spring Slow return valve Piston head Cause Faulty seat Does not move smoothly Foreign matter lodged between the spool and body Broken Valve is stuck closed Piston stuck to cylinder Remedy Exchange the oil seal Replace Replace Replace Replace Replace Specific pressure 155 kglsq cm Replace Replace Clean Supplement Replace Item Hydraulic pum...

Page 15: ...ean Replace Check the water leakage into the hydraulic line Item Hydraulic pump Feed back arm Others Cause 1 Moving portion of shaft is worn 2 Shaft is bent Rod distance is insufficient 1 Strainer is clogged 2 Viscosity of fluid is too high 3 Water is mixed in with the hydraulic fluid ...

Page 16: ...YANMAR DlESEL EklGINE C0 LTD 1 11 1 Marunouchi Chiyoda ku Tokyo Japan Cable YANMAR k b l e x 0222 2310 0222 4733 YT770Ff 165E Printed in Japan ...

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