Daewoo DVN-8100N Instruction Manual download pdf (Page 99)

4.

TROUBLE

SHOOTING

CHART

TROUBLE

Pump

not

delivering

fluid.

Pressure

does

not

build

up in the

system.

Noisy

pump.

CAUSE

Fluid

level

too low in

header

tank.

Plugging

of

intake line

or

suction filter.

Intake

line

not air

tight.

Dirt

in

control valves.

Pump

not

delivering fluid.

Relief

valve setting pressure

is

not

high

enough.

Relief

valve open.

Fluid

leakage from hydraulic

system.

When

there

id

free

flow from

system

to

header tank.

Plugged intake

line

or

suction

filter.

Leakage

at

shaft seal

or

intake

line.

Relief

valve chattering.

Air

bubbles exist

at

suction.

Air

breather

installed

on

header

tank

is

plugged.

When

pump speed exceeds

specified speed

Capacity

of

suction

filter.

Wrong direction

of

rotation

of

pump

REMEDY

Check

for

fluid level

in

header

tank.

Clean filter

and

replenish with

new

fluid carefully.

Check

for air

tight

at

intake

line.

Clean

control valves.

Check

fluid

at

inside

of

reservoir.

See

if

fluid

is

circulating

by

removing

plug

or

loosening joints near

the

pump pressure

line.

Check

by

pressure gauge

by

stopping

machine

or

circulation

of

fluid.

Check

for

pressure control

portion

of

relief valve.

Step

by

step checking

be

made

according

to the

hydraulic

circuit

diagram.

Check

for

shifting position

of

each valve. Also check

for

electrical

circuit.

Prevent

cavitation

at

intake

line.

Clean intake line

and

suction

filter.

Pour

fluid

on

intake

line

and

check

for

change

of

noise.

Pour

fluid

on

intake

line

and

check

for

change

of

noise.

Return

pipe must

be

below fluid

level

and for

away from

suction.

Clean

air

breather.

Re-read

this manual

and

check

for

max. speed.

Filter

capacity

is

suitable when

the

requirement

is met by a

clean

filter

larger filter

will

do no

harm

Read

this

manual

and

check

for

direction

of

rotation. When

reversing

the

direction

of

rotation

of

pump,

reassembly

of

pump

or

replacement

of

pump parts

is

required.

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