maintenance & trouble shooting

7/30/2019 Maintenance & Trouble Shooting

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General Maintenance Measures of

Voith Hydraulic Couplings


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Maintenance Measures With Unit Running

Daily:

Check the oil level in coupling.

Temperatures of bearings, lube oil & working oil

Lube oil and working oil pressures

Differential pressure on the lube oil filter
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Every 1000 hours of operation:

Check operating oil for contamination.(centrifuge if required)


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Measure, record and compare smooth running (vibrations)under the same operating conditions.

In case of any problem, please check first the alignment.


Every 3 months:


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Maintenance Measures When the Unit is at

Standstill

Every 2 Months:

Clean vent filter.

Check smooth running of actuator.

Visually inspect gear stage.

Check operating oil for contamination.

Check oil level. In case of too high oil level, check for watercontent in the oil
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Standstill

Every 8000 hours of operation or at least annually:

Analyze operating oil for aging and other specifications.

Inspect and maintain connecting couplings. Check the actuator functioning. Check alignment and foundation fixing of hydraulic coupling. Visual inspection (corrosion, general condition etc) of hydraulic

coupling internals by removing inspection cover on top housing.

Visual inspection of tooth contact pattern. Inspection of fusible plugs. Check and maintain A.O.P. motor


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Standstill

General Overhaul:

In the event of a change in operating behaviour or after maximum5 years operating time, variable speed & geared variable speedturbo coupling should be overhauled.


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Trouble Cause(s) Action(s)1. Scoop tube in 0% position Move scoop tube in 100% direction.

2. Oil pump not delivering Check the oil level in the sump.any oil Check the direction

Check oil pump itself.

3. Starting torque too high. Check the driven machine itself.

Driven machine blocked.

Driven machine

cannot start afterthe drivingmachine hasreachedits rated speed

Start-up
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Trouble Cause(s) Action(s)

1. Driven machine is jammed. Remove obstacles.

(Check fusible plugs)

2. Oil flow too low Check oil flow

Coupling heats upexcessively duringstart-up

Start-up


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1. Lack of cooling water. Check cooling system.

Water is too warm Clean cooler.Cooler contaminated

2. Over loading of the coupling Check design data(Check fusible plugs)

Coupling heats upexcessively duringoperation

Start-up


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Trouble Cause(s) Action(s)1. Momentary fluctuations in the Check the system and stabilize.

driven machine.

2.Oil temperature is too low. Increase the temperature.(poor deaeration of oil) (45C to 50C)

3.Gear pump is aspirating air. Check oil level of sump.

Fluctuations of output

speed during manualcontrol of coupling(Control lever at standstill)

Output Speed
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Trouble Cause(s) Action(s)1. Improper input signal to the Check the controller and

actuator. calibrate.

2 .Air entering into the oil circuit. Check and eliminate.

Fluctuations of output

speed during autocontrol of coupling(To & fro movement of

control lever)

Output Speed


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Trouble Cause(s) Action(s)1. Scoop tube is jammed. Remove obstacles.

2. Actuator defective Check the actuator.

3. Input signal problem Check the controller.

Output speedcannot becontrolled

Output Speed


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Trouble Cause(s) Action(s)1. Scoop tube not in 100% Check the scoop tube position.

Position.

2. Fusible plugs responded Find and eliminate the cause.Insert new fusible plugs.

3. Too high power requirement Compare the power data with the

of driven machine project data.Check driven machinefor smooth running.

Max.Outputspeed cannotbe reached

Output Speed


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Trouble Cause(s) Action(s)1. Lube oil filter clogged Change over lube oil filter and clean

the filter element.

2. Leak in the oil circuits Check the pipe lines,coolers etc.

3. Improper orifice sizing. Correct the orifices.

Lube oilpressure is low

Pressures


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1. Lube oil filter clogged Change over lube oil filter and clean

the filter elements.

Differentialpressure acrossdouble oil filtertoo high

Pressures
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Trouble Cause(s) Action(s)Lube oil Cooler Problem1. Cooling water flow rate too low Increase the cooling water flow rate2.Cooling water too warm

3.Cooler is contaminated

Check and clean the cooling system

1.Fusible plugs responded Find and eliminate the cause.Insertnew fusible plugs.

Lube oil temperaturetoo high downstream

of lube oil cooler

Temperatures

Lube oil temperaturetoo high upstream oflube oil cooler


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Trouble Cause(s) Action(s)Temperatures

Bearing temperaturetoo high

1. Bearing damage Check the bearings and replace.

2. Lube oil temperature too high Check the lube oil cooler.

3.Lube oil pressure too low Check the lube oil system anddifferential pressure.


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Trouble Cause(s) Action(s)1.Faulty alignment Check and correct alignment.

2.Foundation bolts are loose, Check the foundation and retightenthe foundation is defective the foundation bolts.

3. Wear or insufficient lubrication Check the connecting couplings.of connecting couplings

4. Unbalance of rotating parts Measure the vibration and check therunner parts.

5.Bearing damage Check and replace bearings.

Smooth Running

Uneven running,vibration andnoise


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