MEFE—Mitchell Engineering Food Equipment Pty Ltd
23 Storie Street Clontarf QLD 4019 Australia
www.mefe.com.au | [email protected]
Page 7
+617 3283 4536
Free AU 1800 669 006
7. Breakdown analysis and removal Continued
7
-
3 Breakdown and removal of single stage rotary sheet vacuum pump
Breakdown
Reason
Solving method
Pump can
’
t reach the stipulated max.
vacuum
Lubricant oil goes bad
Re
-
measure max. vacuum after replacing oil
Oil in tank isn
’
t enough
Add oil to the stipulated oil level
Oil pipe leaks
Replace or reassemble oil pipe
Sealing of aspiring pipe is poor
Check on the sealing condition of pipe and
connecting position for getting rid of leakage
Air
-
in valve sheet is jammed
Check up if the air
-
in valve
’
s action is flexible
Oil sealing leaks
Replace the oil sealing
Vane is distorted and the slide isn
’
t smooth
Replace vane
Worn
-
and
-
torn inside
Repair the worn position or re
-
adjust
Pump can
’
t start
Insufficient voltage or burned fuse
Check on voltage on fuse
Pump or motor is jammed
Remove fan cover, try to turn the motor with a
hand, then find out the reason of jamming
Pump
’
s starting current or work current
is too high
Pump oil is too full or the brand is wrong
Check on oil level and brand
Lower temperature is causing too high
viscosity of lubricating oil
Replace with oil of lower viscosity. Start after
preheating oil when environmental temperature
is lower than 5⁰C
Exhaustion filter is blocked
Clean or change filter
The temperature is too high when pump
runs
Pump oil is too full or too little
Check on and adjust oil level
Heat radiation is poor
Clean the radiating fins of pump and motor to
improve the ventilation situation
Pump is jammed when running
Running under wrong direction for a long time
Correct the turning direction and do an overall
check
-
up of pump at the same time
Friction surface is lacking of oil
Dredge oil pipe and check up gap to find out the
reason of lacking oil
Abnormal noise when the pump runs
Driving parts are seriously worn or loose
Find out the trouble position and repair in time
Air vent smokes or vents oil drop
Pump oil is too full
Discharge redundant oil
The installation position of exhaust filter isn
’
t
correct or the material breaks
Reassemble or change the exhaust filter
Exhaust filter is blocked
Clean or change filter
