CHAPTER7
If
there are indications that the oil metering valve
has
become clogged at its orifice, it will be neces-
sary to disassemble the control to remove the
obstruction. Clean the slotted stem
of
the oil
metering valve with suitable solvent and blow-
dry with an air line. Follow the procedure
out·
lined above when removing
or
reinstalling the
metering valve stem.
Also check all fuel line
strainers.
Should a pressure adjusting
or
relief valve be-
come clogged, disassemble by releasing the lock-
nut and backing
off
the adjusting screw to relieve
tension on the diaphragm. Remove valve cover
and diaphragm. This will expose any dirt or
foreign material which may have entered the
valves. Clean out carefully and reassemble.
It
is
recommended that the diaphragms
be
replaced
annually.
0.
THE
AIR
PUMP
AND
LUBRICATING
SYSTEM
Air
Pump
The air pump itself requires little maintenance;
however, the life
of
the pump is dependent upon
a
su:f:ficient
supply
of
clean cool lubricating oil.
The oil level in the air
..oil
tank must be observed
closely. Lack
of
oil will damage the pump
making replacement necessary. Disassembly or
field repairs
to the pump are not recommended.
Lubricationg Oil
Lubricating oil must
be
visible in the gauge glass
at all times. There is no specific level required
as
long as oil
is
visible. Do not operate
if
oil
is
not
visible.
Oil
with proper viscosity must
be
used. SAE20
detergent is recommended although SAElO
detergent also
is
permissible.
Oil
is
normally added by removing the filler cap
plug in the top
of
the tank (Figure 7-5) and adding
sufficient oil
to raise the level to the midpoint
of
the sight glass. This cannot be done while the
750-150
INSPECI'ION
AND MAINTENANCE
P.a<ING
GLANO
*GASKET
*GUICE.
BRASS, UPPER
~===s:;::==
*0-ANG
1.-T':.?"'""--~--
~ACKING,
TEFLON
~-----t--
*GUICE, BRASS
PACKING,
TEFl.ON
l-----+--*wiOE.
E1F'AS8,
W~ING
FUS.OIL
CCINTFW:)IJ.ER
OFIIACE
METERING
VALVE
STEM
CRACE
RETAINING
SPRNG
OIL
TO
EIJFIER
*
INCLUDED
IN
KIT
88~370
[FIGURE
7-6/
METERING VALVE
PACKING SEQUENCE]
LUBE
OIL FILLER
HOlE
srea..
WOOL
OIL
SEPARATOR
5
OZ.
EACH
CHAMBER
I
I
. \
AIR
TO
BURNER
I
SYSTEM
OIL
LEVEL
SIGHT GLASS
l
...
~---
-------
.------
),
,.
"""""
~:::.::::
____
~:::::::~----./
OIL
TO
AIR
AIR
AHO
OIL
FROM
AIR
PUMP
DISCHARGE
PUMP
[FIGURE 7·7 I AIR OIL RECEIVER TANK]
CHAPTER 7-15
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