Page 56 - Webster Service Manual

51
BODY STYLE C
C” ROTATION DIRECTION
Do Not
Use
This Port
Discharge Port #1
1/4”
Pipe Thread
Inlet Port #2
1/4”
Pipe Thread
Discharge Port #3
1/4”
Pipe Thread
Inlet Port #1
1/4”
Pipe Thread
Discharge
Port #4
1/4”
Pipe Thread
Discharge Port #2
To vent pump loosen
gauge port plug,
or any unused
discharge port.
For use as
gauge port
remove plug to
install 1/4” pipe
threaded gauge
BODY STYLE D
D” ROTATION DIRECTION
OPPOSITE OF THAT PICTURED
(
See rotation arrow on top
of pump to confirm shaft
rotation direction)
INSTALLATION DATA
1.
Connect preferred inlet to tank through suitable line
filter.
2.
Connect preferred discharge port to external regula-
tor or distribution system.
3.
For initial priming it is desirable to loosen the gauge
port plug or any unused discharge port to bleed air from
the supply line and pump. Tighten the plug securely
when oil flows clear.
Failure to prime pump may be due to “dry pump” condi-
tions. Remove vent plug and fill pressure cavity slowly
to allow oil to “wet” the gears.
4.
Be certain all plugs and connections are secure and
leak-tight
Checking for Air Leaks
Be certain all plugs, fittings and joints are secure and
airtight. Many problems in fuel unit installations result
from air leaks in the suction line.
Measure inlet vacuum during operation at an unused
inlet port. An abnormally low vacuum reading may indicate
an air leak. Generally, assume 0.75 inch of vacuum for
every foot of vertical lift, plus frictional tubing losses and
other in-line restrictions.