Troubleshooting guide
Symptom
Problem
Solution
Does not start
ON/OFF switch
Turn switch on, replace if defective.
No electrical power
Plug in the filter unit, check for tripped circuit breakers, check for
blown fuses.
Rectifier
Replace if defective.
Motor overheated (77°C)
Allow motor to cool, thermal overload will automatically reset.
Defective motor
Replace motor.
Does not start or erratic
Worn motor brushes
Replace motor brushes.
motor noise
Intermittent start/stop
High viscosity fluids
High viscosity fluids can cause the motor to overheat and cycle
operation
intermittently.
Worn motor brushes
Replace motor brushes.
Defective motor
Replace motor.
Hot motor
Pumping under heavy load
It is normal, under a heavy pumping load, for the motor to reach
71°C.
Defective motor
Replace motor if the motor shell temperature reaches greater
than 77°C.
No flow or erratic
Filter housing not filled with oil
Allow the filter unit to run for a few seconds.
pump noise
Suction leak
Check tightness of inlet fittings and hoses. Check gaskets are in
place and are not damaged. Check for kinks or restrictions in the
inlet hose.
No suction
Blocked strainer
Clean or replace the inlet strainer as required.
Reduced oil flow
High viscosity fluids
High viscosity fluids can cause reduced flow, which is normal.
Element dirty
Replace or clean element.
Relief valve sticks or lodged open
Clean relief valve or replace if defective.
Partially obstructed inlet or
Clear the hose obstruction.
outlet hose
Suction leak
Check tightness of inlet fittings and hose.
Worn gears
Replace gear set.
Indicator moves to RED
Element dirty
Replace or clean element.
area
Oil extremely cold or viscous
Change element to coarser micron rating.
Obstructed outlet
Clear outlet obstruction.
Defective indicator
Replace indicator.
Indicator does not
No element
Install element.
seem to move
Defective indicator
Replace indicator.
Hoses discolour or
Fluid compatibility
Certain fluids, over time, will cause the hoses to discolour. This
become rigid
does not impair their, performance. But, some fluids will cause the
hoses to become brittle, requiring replacement.
Oil formation under
Defective shaft seal
Replace the motor shaft seal.
the unit
RS Components
Issued November 1995
10051
