16
101964
Pump
(Procedure if pump is binding)
1. Remove upper shell (see page
14).
2. Loosen hex screw on flange
clamp at rear of motor with
5/16" nut-driver (see Figure
11).
3. Turn fan with hand (see Figure
12).
4. If fan turns freely, tighten
screw on flange clamp.
5. If fan does not turn freely,
replace pump.
6. Replace upper shell.
Fuel Lines
(Procedure for tightening
fuel lines)
1. Remove upper shell (see page
14).
2. Use 7/16" wrench and tighten
fuel lines at solenoid valve (see
Figure 13), pump, and pump
fuel filter assembly (see Figure
14).
Pump Pressure
Adjustment
1. Remove pressure gage plug
from fuel pump port marked
“GAGE.”
2. Install accessory pressure
gage (part number M4574) to
fuel pump port marked
“GAGE” (see Figure 10).
3. Start heater (see Operation,
page 8). Allow motor to
reach full speed.
4. Adjust pressure to 100 psi.
Use small flat blade screw-
driver to turn slotted screw at
fuel pump port marked
“PRESS ADJ.” Turn screw
clockwise to increase
pressure. Turn screw
counterclockwise to decrease
pressure.
5. Remove pressure gage.
Replace pressure gage plug
in fuel pump port marked
“GAGE.”
Fuel
Line
Pump
Figure 14 - Fuel Lines at Pump and
Pump Fuel Filter Assembly
Fuel
Lines
psi
Figure 10 - Adjusting Pump Pressure
Pressure
Gage
Fuel Pump Port
Marked “PRESS ADJ”
Fuel Pump Port
Marked “GAGE”
Figure 12 - Turning Fan with Hand
Figure 11 - Location of Screw
on Flange Clamp
Hex Screw On
Flange Clamp
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Pump
Fuel Filter
Assembly
Solenoid
Valve
Burner Head
Figure 13 - Fuel Line at
Solenoid Valve
