Daewoo DVN-8100N Instruction Manual download pdf (Page 96)

may

have

the low

pour

point,

certain viscosity requirements must

also

be

met.

In

general,

a

viscosity range

of

4000

'to

2000

SUS is

considered acceptable

for

operation

of

hydraulic systems.

The

acceptable operating viscosity range

of

4000

to

2000

SUS is the

extreme

range which

can be

tolerated.

To

avoid

damage,

intermittent starting schedule

may be

followed.

One

procedure

is

:

a)

Drive

the

pump

for 5

sec. Stop!

Allow

to

stand

for 20

sec.

b)

Repeat

step

1 ten

times.

c)

Drive

the

pump

for 20

sec. Stop!

Allow

to

stand

for 20

sec.

d)

Repeat step

3

five

times.

e)

Run the

unit continuously

at

light

load until

oil in the

entire system

is

warm.

2.2

Operating sequence

and

adjustment

Refer

to

hydraulic

circuit

diagram

and

other attached drawings.

2.3

Maintenance during operation

(1)

Checking

of

fluid

in

header tank

Fluid

in the

header tank must keep

the

level indicated

by the

level gauge

on

the

header tank.

(2)

Temperature

of

fluid

Fluid temperature must

be

within

the

range

of

10t:

~

60°C.

Best

condition

may

be

obtained

at

40t:

~

50t:.

(3)

Checking

of

pressure gauge

Pressure

gauge must

indicate

the

pressure

of

relief valve

or

that

corresponding

to the

load

of the

cylinder

or the

hydraulic motor.

In

must

not

vibrate

extremely.

(4)

Checking

of

noise

Check

shall

be

made

if

there

is any

chattering noise.

3.

MAINTENANCE

3.1

Changing

of

hydraulic fluid

(in

header tank)

Careful

attention shall

be

paid

to

hydraulic fluid

at all

times.

It is

desirable

to

renew

the

hydraulic, fluid after

a

certain period

of

operation. This period

may

very widely

according

to the

operating temperature, degree

of

continuous operation, amount

of

foreign

matter

in the

fluid,

effectiveness

of

filter,

the

characteristics

of the

fluid, etc.

Sample

of oil

shall

be

taken once

a

month

for

observation.

If the oil is not

clean

and

become cloudy,

or if

there

is

clear evidence

of

containing

foreign

matter,

then

it is

advised

to

send

a

sample

to the oil

manufacture

for

test,

and the

proper measure shall

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