19.0 POSSIBLE FAULTS AND HOW TO DETECT THEM.
THE BLOWER MAKES PECULIAR NOISES
- Base bolts loose.
- Incorrect alignment between the blower and the motor.
- Bolts loose in the coupling.
- Drive belts slack.
- Belts rubbing against the drive protection.
- Mufflers in poor condition.
- Safety valve triggered (open).
- Drive motor (bearings, unbalanced).
EXCESSIVE PLAY BETWEEN SIDES OF GEARS
Dismantle the sump opposite to the drive side and measure the play between the sides along the whole of the
circumference of the gears. The gear teeth should be totally dry and clean.
If the average play between the sides is 30 to 50 % greater than the average play value engraved on the gears,
then the gears need to be replaced.
EXCESSIVE PLAY IN THE BEARINGS
Measure the tolerance values and compare them with those shown in the bearing catalogues. If the tolerance
values are greater, change the bearings. The polyamide cages do not apply.
PISTONS RUBBING AGAINST THE BODY, SIDE COVERS OR EACH OTHER
- Rotary pistons rubbing, along diameter with the body.
- Due to excess load. Measure the working pressures, as well as the temperatures.
- See original data in order.
- Rubbing between the pistons and the body due to dirt.
- There may be dust, solid particles, damp dust, etc.
- Clean the inside of the compression chamber (see cleaning) and check for hairline cracks in the pistons.
RUBBING BETWEEN THE PISTONS AND THE SIDE COVERS
Overheating. Check for cracks in the shaft pivot and the sides. Also check if the oil seal has moved.
The rubbing may be caused by excessive play in the bearings.
ROTARY PISTONS OUT OF BALANCE
Due to deposits or worn pistons. Clean or replace them.
If repairing, ensure that they are balanced. Afterwards, check the unit for uniform rotation shaft and piston
(eccentricity of shaft)
REHEATING OF BLOWER
-Overheating due to excessive pressure difference.
- Dirt in suction filter. Increase of suction resistance causing reduction of suction flow , resulting in overheating.
-Too much lubricating oil causing additional friction load, which produces heat.
- High oil viscosity also causes overheating. Poor air flow in the machine or blower room. This deficiency
causes blowers to heat up. Room temperature increases due to the hot spots in the blowers, motors, pipes
and any other machines.
- Surpassing internal tolerance values in the blower causes overheating. Low volume output causes
compression heating. Check tolerance values and consult our technical service.
IF UNUSUAL NOISES OR HIGHER THAN NORMAL TEMPERATURES ARE OBSERVED, THE
MACHINE MUST BE STOPPED IMMEDIATELY, AND THE CAUSE MUST BE IDENTIFIED AND
REPAIRED. DO NOT START UNTIL THE BLOWER HAS BEEN REPAIRED.
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