9
ter material as practice determines.
The radiator (Ref. 241) on model 0250, the fan cover
(Ref. 340) on the 0025 through 0101 models and (Ref.
244) on the 0250 model should be inspected regularly
for debris. Soiling prevents cool air intake and may lead
to overheating of the pump.
Drain drip legs on inlet and exhaust piping.
3.7 Overhaul Kit/Filter
An overhaul kit containing a set of gaskets and O-rings,
vanes, bearings and bearing sleeves, shaft seals and
taper pins, is available from the factory.
Also, a filter kit containing oil drain plug, gaskets, auto-
motive-type oil filter (where applicable), exhaust filter,
and synthetic baffle strainer (where applicable), is avail-
able from the factory.
When ordering, please specify pump size and model (a
4-digit suffix after size), and serial number.
4.0 TROUBLESHOOTING
4.1 Trouble
Pump does not reach "blank-off" pressure,
which is the lowest absolute pressure (best
vacuum) when running with the inlet closed
via a blank flange or a valve; or the pump
takes too long to evacuate the system.
Blank-off pressure can be measured by
using a good quality capsule gauge.
Possible Cause:
Contaminated oil is the most common cause of not
reaching the ultimate pressure.
Remedy:
Shut off pump, after operating temperature has been
reached, drain the warm oil from pump and exchange
automotive-type oil filter (where applicable), if neces-
sary. Flush and fill pump with new oil and take new
blank-off measurement after operating temperature is
reached (at least 20-30 minutes).
Possible Cause:
Vacuum system or vacuum piping not leak-tight.
Remedy:
Check hose and pipe connections for possible leak.
tension screw until the filter is secure. Place the
exhaust port gasket and cover in position on the
exhaust box and retain with the cap screws.
3.4 Inlet Flange
The standard inlet flange assembly contains an inlet
screen (Ref. 261) which may require occasional clean-
ly. The frequency of cleaning can only be determined
by experience and is affected by hours of operation and
particle size being trapped. An optional vacuum inlet fil-
ter is offered and can help minimize the need or fre-
quency of cleaning the inlet screen.
To clean the screen, disconnect the flange from the
process piping. Remove the four screws and lock-
washers (Ref. 265/266). Remove the inlet flange (Ref.
260). Remove the screen (Ref. 261) and clean with
compressed air. After cleaning, install the screen and
inlet securing them with the screws and lockwashers.
Make sure the O-ring (Ref. 265) is in place prior to
securing the screws. Reattach the process piping to
the inlet.
3.5 Vacuum Inlet Filter (optional)
If the pump is equipped with a special vacuum inlet fil-
ter in applications where powder, dust or grit is present,
the filter cartridge should be cleaned on a weekly basis,
or as required, depending on the amount of foreign par-
ticles to which the pump is exposed.
3.6 Routine Maintenance Schedule
See the motor manufacturer’s manual for the periodic
motor maintenance.
Note: Lack of proper maintenance can result in
blocked filters, radiators, oil lines, etc. This condition
can lead to excessive heat causing mechanical failure
or ignition of the oil vapors.
Daily: Visually check oil level (see 3.1.1 and 3.1.2).
Weekly: Check oil for contamination (see 3.1.3).
Inspect inlet filter (see 3.5).
Every three (3) or four (4) months, 500 to 750
hours of operation, or as necessary: See 3.1.3
and 1.5. Drain and discard oil from the hot pump.
Replace the automotive-type oil filter and refill with
fresh oil through the fill plug (see 3.1.2 through 3.1.3
and 3.2).
Every nine (9) to twelve (12) months, or as
necessary: Replace exhaust filter elements (see
3.3).
As necessary: Check and/or clean the standard inlet
screen. If the optional inlet filter is used, replace the fil-
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