Yanmar YM240 Manual de usuario

DIESEL

TmACTQm

((HYDRAULIC

DEVICE))

CONTENTS

................................................

Hydraulic

piping

system

.......................

Nomenclature of

the

hydraulic

system

...................

Raising

the

Iift

arm...

...................,..;.......+.+*,

.....................................................

Lowering

the

lift

arm

Control

valve

the

neutral

position

Lift

arm

fuIly

raised

......................................................

Lift

arm

fully

lowered

..................................................

Relief

valve

Work

under

normal

conditions

...................................

........................................

Work

under

sudden

shock

Use

implements

..................................................................

For

outlet

............................................................

For

outlet

.Trouble-shooting

.........................,......*........................

Hydraulic

piping

system

(1)

Main

hydraulic

piping

system

Outlet

J!J-

Oil strainer

---

Relief valve

Stop

valve

Lift

arm

Reseruoir

r"l

~ydradic

icontrol

valve

+j-l

L..

Outlet

t->j&=j

Reservoir

(2)

Implement

)

Power

steering

Power

steering

(b)

Single-cylinder

double

action

Outlet

Hydraulic

cylinder Implement

Relief

valve

Dumping

)

Two-cylinder

double

action

Outlet

Hydraulic

control valve

(_1,1Rmir

Lifting

Hydraulic

cylinder

(B1

Hydraulic cylinder

(A)

(d)

Single-cylinder

single

action

S~O~V~IVC&

Reservoir

stop

valve

M-

Implement

strainer Hydraulic pump Stop valve Control

valve

Cylinder Engine

Implement

Relief valve

)I(

SIOW

return valve

Control valve

Nomenclature

the

hydraulic

system

Stop

valve

The

stop

valve

prevents high-pressure fluid

from

flawing

backwards

from

the cylinder.

Relief

valve

The

relief valve operates

whenever

the

pressure

the

cylinder

exceeds

the

specified

pressure.

Slow-return

valve

The

slow-return valve

controls

the

volume

flow

the

hydraulic

fluid

from

the cylinder

the

re-

servoir.

Stop

valve

Slow-return

valve

Notes:

The

hydraulic

device

employs

high

precision

parts,

the

hydraulic fluid

dirty

contains

foreign

matter,

the

efficiency

the

device will

greatly impaired.

When

assembling

disassembling

the

hydraulic

device,

always

the

procedure described

the

service

manual.

Before operating,

always

check

the

level

the

hydraulic fluid.

low, tefill

the

level

marked

the

dipstick.

The

hydraulic fluid

supplied

from

the

same

reservoir

both

the transmission and

the

hy-

draulic device.

Always

use

"John

Deese

Type

303"

hydraulic

fluid

its

equivalent.

Relief

valve

Hydraulic

pump

The

following

cross-section

the

PV3

positioning

control

valve

used

for

the

model

YM240

tractor.

Relief

valve

j~~draulic

oil

cylinder

case

Raising

the

lift

arm

Low

pressure

pipe

-5-

Reservoir

Lowering

the

lift

arm

Condition:

the slow-return valve,

and

into

the reservoir.

Lift

arm

its

highest position.

The lowering

the lift

arm

pushes

the

feed-back

Action:

rod.

Push

the control lever

forward.

The

feed-back lever

pushed

the

direction

the arrow,

and

pushes

the controlvalve.

Result:

The

control valve

pushed

into

the

neutral

Lift

arm

lowered.

position, closing

the

circuit,

and

the fluid

the

Explanation: (Refer

the

diagram) cylinder stops flowing.

Fluid supplied

the

pump flows

through

the

control valve,

and

return

the

reservoir.

Note:

The

weight

the

implement

pushes

the piston, The speed

the

implement's

descent

controlled

and drives

away

the fluid in the cylinder

through

the

opening

the slow-return valve.

-----

Hydraulic

pressure

outlet

Section

drawing

Hydraulic

pressure

pipe

slow

return

valve

Reservoir

-7-

.m.m**.*.m.m.m.'

Kd'

LOW

pressure

flow

Control

valve

the

neutral

position

Lift

arm

fully

raised

Condition:

Lift:

arm

its

highest

position.

Control

lever

the

rear

position.

Control

valve

the

neutral

position.

Pressure

cylinder

Control

valve

the

neutral

position

Lift

arm

lowered

Condition:

Lift

arm

its

lowest

position.

Control

lever

the

rear

position.

Control

valve

the

neutral

position.

...'...'.*.'.*.'

Low

pressure

flow

Pressure

cylinder

Work

under

normal

coditions

Low

pressure

pipe

Reservoir

,.,.,,,.

,.,.

Low

pressure

flow

w::Q:,:G.,,,...

+:,:.

<:.<:..

;-;;,c-----

- -

High

pressure

Pressure

cylinder

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