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Bitumen Sprayer Failure Analysis and Troubleshooting

Bitumen Sprayer Failure Analysis and Troubleshooting

No.

Fault

Possible cause

Solution

1

The power take-off can not be shifted.

1.Lack of pressure or air leakage from the exhaust pipe may exist.


2.An electrical switch may be damaged.


3.A solenoid valve may be damaged.

1.Check whether the air compressor or pressure regulating valve fails. In case of failure, replace the exhaust pipe.


2.Replace the switch.


3.Replace the solenoid valve.

2

The gearbox can not be shifted.

1.Lack of pressure, or air leakage from the exhaust pipe may exist.


2.An electrical switch may be damaged.


3.A solenoid valve may be damaged.


4.The small cylinder may be damaged or the connection may come off.


5.The truck clutch may not disengage completely.

1.Ditto.


2.Ditto.


3.Ditto.


4.Replace the small cylinder or securely fix the connection.


5.Adjust the truck clutch.

3

The asphalt pump does not work.

1.The hydraulic system may fail.


2.A blocking solid object may exist.


3.Seizing asphalt may exist.

1.Remove the hydraulic system failure.


2.Dismantle the asphalt pump to remove solids.


3.Wash the asphalt pump with diesel and bake the waste gas.

4

The hydraulic motor does not work or turns over at a lower speed.

1.The overflow valve may be seized, or the pressure may be low.


2.The reversal valve coil may have no power or burnt out.


3.The oil temperature may be excessively high, or there may be no pressure.


4.The hydraulic pump or motor may be worn out.

1.Dismantle and wash the overflow valve, and readjust the pressure.


2.Check the circuit or replace the coil.


3.Will be described in the column below.


4.Replace the hydraulic pump or motor.

5

The temperature of hydraulic oil is high (85℃ or above).

1.The hydraulic oil is insufficient.


2.There may be too much resistance to the asphalt pump, or oil leak from the overflow valve under high pressure for a long period.


3.The oil suction filter may be blocked.

1.Fill hydraulic oil.


2.Check the asphalt pump and the overflow valve.


3.
Clean the filter.

6

The burner can not be ignited.

1.There may be no power supply.


2.The filter may be soiled, or fuel pipe may be blocked.


3.Carbon deposit or blockage of burner may exist.


4.Oil supply pump may be worn out, or oil pressure may be too low.

1.Check the generator and the switches in temperature control box.


2.Clean the filter and blow the oil pipe with compressed air.


3.Dismantle and wash the burner.


4.Replace the oil supply pump of burner.

7

The asphalt pump works normally, but sprays no asphalt.

1.The asphalt valve may be placed at a wrong position.


2.The suction oil inlet may be blocked by asphalt.


3.The asphalt filter may be blocked.


4.The oil outlet pipe may be blocked by asphalt.

1.Adjust the valve position by following the instructions described in Section 1, (V), III.


2.If hot asphalt is used, wait for self melting, or heat it with heat transfer oil.


3.Take out and wash it.


4.Heat, bake or dredge the oil outlet pipe with heat transfer oil.

8

The spray pressure is insufficient or intermittent.


1.The asphalt filter strainer may be blocked.


2.Filter cover may have a air leakage.


3.The main pipe air valve may be not closed tightly.


4.The temperature of asphalt may be too low.


5.The oil return valve (No. 7) may be not closed.


6.The asphalt pump may be worn out.


7.Operation of hydraulic system may be not stable.


8.The control system may fail.

1.Remove the trouble.


2.Tightly seal and cover.


3.Close the valve tightly.


4.Heat asphalt to the designated temperature


5.Place the oil return valve (No. 7) to the proper position.


6.Repair or replace the asphalt pump.


7.Check the hydraulic system.


8.Check the actual pump speed and voltage.

9

Asphalt is not sprayed evenly.

1.The spray pressure may be insufficient.


2.The nozzle may be blocked by foreign matters.

1.Check and adjust as the above mentioned.


2.Remove the foreign matters.


10

Can not add asphalt by self-suction


1.The oil inlet valve may be not closed securely, or the oil return valve (No. 7) may be not opened.


2.The filter cap may have an air leakage.


3.The main pipe air valve may be not closed tightly.


4.The temperature of asphalt is may be too low.


5.Gas leakages from the joint connection of the self-suction pipe may exist.


6.The truck may be too far away or too close to the asphalt storage tank.

1.Check the valve.


2.Tightly seal and cover.


3.Close it tightly.


4.Heat asphalt to the designated temperature


5.Add sealing gasket and press it tightly.


6.Change the condition; otherwise, do not start self-suction.

11

Heat transfer oil overflows.

1.Heat transfer oil may be excessively full.


2.The heat transfer oil system may have water entry.


3.Heat transfer oil newly filled may be a type from a different trademark or its water content may be too high.

1.Reduce heat transfer oil.


2.Heat up and dewater the system.


3.Replace the heat transfer oil.

12

Asphalt pump leaks asphalt.

The packing in the place of collar may be worn out.

Appropriately screw in the nut, or add packing.


The above table is for reference only. If you cannot correctly judge the failure and exclusion, please consult our service department.

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