Daewoo DVN-8100N Instruction Manual download pdf (Page 17)

5.

Hydraulic Pump Unit (DWGNO.

SB-E202-*.

SB-E302-*)

The

oil

transferred from hydraulic pump(2) goes through check valve(8)

and is set to

9.81

MPa

(100

kgf/cm

2

)

at

relief

valve(5)

and

enters solenoid valve(6). When propeller pitch

is not

controlled,

that

is,

there

is no

electric current

on

coil

of

solenoid valve,

the oil

transferred

from

the

pump will

be

returned

to

tank with

no

load.

When

there

is

electric

current

on any

solenoid valve,

the oil

from

the

pump

will

be

hydraulic

oil in A or B

direction.

As A, B

ports

and the

thruster

are

connected with

piping,

the oil

transferred

will come

into

the

cylinder

of the

inside

of the

thruster,

and

pitch will

be

controlled.

For

checking

set

pressure

9.81

MPa

(100

kgf/cm

2

),

propeller pitch shall

be

changed

to

full-

starboard

or

full-port with manual operation

of

solenoid valve,

and

adjustment

shall

be

made

with

the

screw

of

relief

valve,

pressure

gauge(9) being carefully watched. When

the

screw

is

turned

to

right,

the set

pressure

will

increase,

and to

left,

it

will

decrease.

After

the

setting, propeller pitch shall

be

changed

to

O(zero)

degree without fail.

After

the

setting,

the

indicator

of the

pressure gauge will

be

down

at

less than 1.96

MPa (20

kgf/cm

2

).

Pitch changing speed adjustment shall

be

made with screw

of

flow regulator(7). When

the

screw

is

turned

to

right,

the

pitch changing speed will

be

fast,

and to

left,

it

will

be

slow.

When

the

hydraulic pressure

of the oil

delivered

by

hydraulic pump

is

decreased (0.4

MPa

(4

kgf/cm

2

)

or

lower), signal will

be

given

by

pressure switch(4)

and

then warning lamp

of

"HYD.

PUMP

LOW

PRESS"

will

be lit on

wheel house control panel.

Besides,

in

case electric lines

are in

disorder,

and

solenoid valve does

not

operate,

the oil

from

the

pump

will

be

delivered

to A or B

direction with

the

spool

of

solenoid valve operated

where

rod is

directly pushed

in

solenoid valve,

and

then propeller pitch

can be

operated.

6.

Header Tank (DWGNO.

SB-E102-*)

Header

tank

is for the

supplying

the

thruster with gravity oil. Stop valve

on

gravity

oil

line

is

open

at

normal operation

condition.

Level switch(3)

is for

alarming

in

case

the oil in the

tank

is

below

the

fixed

level(abt.

85 L).

When

oil is

decreased

in

quantity(abt.

45 L or

lower),

signal

will

be

given

by

level switch(3)

and

warning lamp

of

"HEADER TANK

LOW

LEVEL"

will

be lit on

wheel house control panel.

The

tank shall

be 85 L of oil

inside.

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