Common Fault Analysis

For Reducer

FAILURE

PROBABLE REASONS

Oil leak

Flange joint

Bolt looseness

Gasket or sealant failure

Motor

Oil seal is damaged

Output shaft

Oil seal is damaged

Oil plug

Looseness

Air breather

Too much oil

Frequent cold start

Abnormal

noise

Regular impact noise

Bad meshes of gears

Stable grinding noise

Bearing failure

Irregular noise

Oil mixed with impurities or oil shortage

The motor is running, but output shaft doesn’t work.

Flat key damage

 

For Top-entry Mixer

FAILURE

PROBABLE REASONS

Equipment

Vibration

Rack and flange joint

Anchor bolts looseness

Horizontal error of steel girder or steel structure bearing discrepancy

Assembly bearing block

The large nut fixed on the shaft sleeve of agitating shaft is not completely tight、retaining washer position

Agitating shaft

Bolt which connecting with flange is not complete tight

There is some damage on the flange joints of agitating shaft

Impeller

There is some damage on mounting surface. The bolt is not completely tight.

The blade does not do any dynamitic balance adjustment or has deformed by extra force.

 

For Side-entry Mixer

FAILURE

PROBABLE REASONS

Equipment

Vibration

Rack and flange joint

The bolt is not completely tight.

The intensity of tubing is not enough or not set plate stiffener.

The intensity of tank construction is not enough.

Agitating shaft

The shaft has deformed by extra force.

In installation of section: the coupling is not tightened and located.

Impeller

The blade does not do any dynamitic balance adjustment.

The blade has deformed by extra force.

 

For Mechanical Seal

FAILURE

PROBABLE REASONS

Mechanical seal leakage

Sealing

surface

leakage

Normal wear and reach to renewal time

Choose wrong material and result in unusual wear

The sealing surface is damaged by extra force or does not reach the starting condition

Shaft sleeve

O-ring within the shaft sleeve is damaged.

O-ring between the mechanical seal and shaft sleeve is damaged.

Working time is beyond the service life


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