THERMOJET
®
G-3700E SERIES
OIL PURIFIER SYSTEM
INSTALLATION AND OPERATING MANUAL
Doc #
77740151
Rev
03
Date
June 2020
Page
50
of
111
Oil Filter Maintenance
Check the inlet pump discharge and filter discharge pressure gauges for the pressure loss
between the two readings. If the pressure loss is approaching 1.7 BAR (25 PSID), the filter
element is plugged and must be changed. The filter element should be changed when the
pressure loss is 1.7 BAR (25 PSID).
To change the filter element, first shut down the ThermoJet and turn OFF the nitrogen supply.
See the section titled
Shut Down Procedures
on how to turn the ThermoJet Oil Purifier OFF.
Remove the vent plug located on top of the filter housing to prevent the siphoning of oil out of the
heater tube.
Open the drain valve at the bottom of the filter housing and allow the oil to drain into a suitable
container.
Turn the locking ring on the filter housing counter-clockwise using the supplied wrench that is
attached to the filter housing until the housing is loose. Drop the filter housing down from the filter
head. Remove the dirty filter element and install a new one. Check the condition of the O-ring in
the filter housing and replace the O-ring as necessary.
Reinstall the filter housing and using the spanner wrench to tighten and secure the filter housing
with the lock-nut.
Reinstall the vent plug on top of the filter housing.
Restart the ThermoJet Oil Purifier and verify normal readings on the inlet pump discharge and
filter discharge pressures. Pressure loss between the two readings should be zero.
Use spanner wrench
to remove locking ring
Use valve to drain
contents for oil filter sump
Remove filter sump
and replace element
Filter Vent Plug is
located on the top of
the oil filter head
