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Isoil impianti SpA
Code MA/038/00/EN/03
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4.9 Maintenance schedule
Task
Monthly
6 Months
12 Months 24 Months
Visual inspection of manifold
and meter body; check for leaks
X
Inspection of the meter; check
for internal part status: vanes,
rotor, measure chamber, o-
rings; check for wear or
damage.
X
4.10 Fault diagnosis
Fault
Possible Cause
Corrective Action
Liquid passing with
normal flow rate but
counter fails to
register.
1. Defective counter.
Remove and check the counter
by rotating bottom coupling. In
case of any problem in the
counter, contact the factory.
2. Drive from the rotor fails to
reach the counter, due to
sheared pins in the calibrating
mechanism.
Check cross pins fitted on all
gears in the calibrating
mechanism.
No liquid passing
through.
1. Defective counter.
Remove and inspect the counter
for free movement.
2. Jammed calibrating
mechanism.
Remove and inspect the
calibrating mechanism. Identify
the source of friction and replace
relevant parts.
3. Jammed rotor assembly.
Dismantle
meter
assembly.
Inspect front & rear covers and
rotor for scoring marks. Inspect
vanes and bearings for damage.
Causes of rotor jamming :
a. Solid particles trapped on
rotor surface.
Clean the rotor surfaces.
b. Incorrect adjustment of rotor
end clearance due to loose or
defective bearing adjuster.
Check setting of bearing
adjuster. Clean and inspect the
bearing adjuster.
c. Rotor bearings jammed.
Clean bearings and cover, and
inspect for any damage.
d. Rotor bearings worn out.
Replace the bearings, if axial
play is observed.
e. Misalignment of front & rear Ensure that both dowel pins are