Gardner Denver ELECTRA-SAVER II Service Manual page 38

OIL
'OUT
WHITE
R
INDIcATOR SHOWS
NORMAL OPERATION
FIGURE 5-5. –
INDICATOR SHOWS
"CHANGE FILTER"
675792
CONDITION
COMPRESSOR OIL FILTER
free compressor, since it removes dirt and abrasives from
the circulated oil The filter is equipped with a relief valve
that opens in the event the element becomes dirty enough
to block the flow of oil
~CAUTION
Element must be replaced every 1000 hours or sooner
or when top of the indicator on the filter is in red
"Change Filter" half of window. Unit must be run-
ning and warmed up for indicator to read accurately.
Check with light to be certain of indicator position
.
some lubricants will obscure the indicator
Use only the replacement element shown on the filter tag
or refer to the parts list for the part number. Use the
following procedure to replace the filter element Do not
disturb the piping
.
1.
DANGER
Stop unit and be
reservoir
2.
3.
sure no air pressure is in the oil
To remove cannister (3) rotate tie bolt (1 O) counter-
clockwise until cannister is free of head assembly(l).
Remove the element (6) from cannister. Remove in-
dicator assembly (5) from the element by inserting
screwdriver between indicator assembly and element
and carefully prying downward Inspect 0-ring (4) for
cuts or excessive wear and discard the element
Rinse out cannister with clean fluid to remove any
contamination
Remove O-ring (2) from head assembly and inspect
for cuts or excessive wear. Wipe O-ring area of head
(1) with clean cloth and after covering O-ring with oil
reinstall in head assembly. Check the indicator as
sembly (5) machined bore in the head for burrs or
deep scratches and carefully smooth out if required
4.
5.
6.
Install indicator assembly(5) into new element Place
the element into cannister making sure spring (8),
washer gasket (9) and tie bolt (1 O) are in the proper
position
NOTE
Large diameter end of spring should contact the new
element
Place cannister as previously assembled into head
assembly and rotate bolt clockwise until torqued to
20 foot-pounds
If leakage appears at bottom of cannister, replace
washer gasket (9). If leakage appears at top of can
nister replace O-ring (2). If this does not stop the
leakage, the cannister may be nicked or distorted by
overtorquing and should be replaced
COMPRESSOR OIL COOLER ( RADIATOR TYPE)
MODULE — The air-cooled oil cooler module is remote
mounted
The oil cooler requires pipe and electrical connection to the
main compressor unit Connecting piping and wiring are
furnished by the user. See " Installation" Section 2.
Do not obstruct the air flow to and from the oil cooler.
Allow two (2) feet clearance on all sides of the oil cooler.
See Figure 2-2 for cooling air flow requirements Keep both
faces of the oil cooler core clean for efficient cooling of the
compressor oil Oil cooler malfunctions may be traced by
checking oil pressure drop through the oil cooler check by
installing pressure gauges at fittings in the inlet and outlet
oil piping near the end of the cooler. At normal operating
air service pressures (65 to 150 PSIG) with the unit warm
a pressure drop of 2 to 25 PSIG can be expected between
the inlet and outlet side of the cooler. The instrument
panel
thermometer indicates compressor discharge air temper-
ature which would also be the approximate oil temperature
into the mixing valve
An oil filler stand pipe and plug must be located in the
piping on the oil cooler module for ease of filling the oil
cooler when it is mounted at a distance from the com
pressor unit
When filling a remotely mounted oil cooler be sure all lines
to and from the compressor unit are also filled to prevent
excessive drawdown of the oil supply in the oil reservoir.
A vent line should be installed between the oil cooler and
compressor oil reservoir as an aid in filling and to prevent
siphoning
THERMAL CONTROL (THERMOSTATIC MIXING)
VALVE (Figure 6-5) on current units is installed in system
as shown in Figure 1-5 (on early units this valve is in line
between reservoir and cooler. This valve is used to control
temperature of the oil in both radiator and tube type oil
cooler systems The element is so designed that a portion
of the oil can flow through the oil cooler at all times On
start- up with unit cold element is open to bypass allowing
oil to pass directly from the reservoir to compressor during
warm-up. As oil warms element gradually closes to the
bypass allowing more of the oil from the cooler to mix with
oil from the bypass After unit is warmed up mixing valve
maintains oil injected into compressor at a minimum of
13-9-630 Section 5
Page 4