Draper 04174, Manual

Page: 17 / 24

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11. MAINTENANCE
11.8 PUMP ROTOR – FIGS.13–14
− (Procedure if Rotor is Binding)
− 1. Remove upper shell
− 2. Remove filter end cover screws using
nut driver
− 3. Remove filter end cover and air filters.
− 4. Remove pump plate screws using nut-driver.
− 5. Remove pump plate.
− 6. Remove rotor
(2)
, insert
(1)
, and blades
(3)
.
− 7. Check for debris in pump. If debris is found,
blow out with compressed air.
− 8. Install insert
(1)
and rotor.
− 9. Check gap on rotor (FIG.14). Adjust to
0.08/0.12mm if needed using gap adjust
screw
(4)
. Note: Rotate rotor
(2)
one full
turn to ensure the gap is 0.08/0.12mm at
tightest position. Adjust if needed.
− 10. Install blades
(3)
, pump plate, air filters,
and filter end cover.
− 11. Replace fan guard and upper shell
− 12. Adjust pump pressure. Note: If rotor is still
binding, proceed as follows.
− 13. Perform steps 1 through 6.
− 14. Place fine grade sandpaper on flat surface.
Sand rotor lightly in “figure 8” motion four
times
− 15. Reinstall insert
(1)
and rotor
(2)
.
− 16. Perform steps 10 through 12.
11.9 PUMP PRESSURE ADJUSTMENT
– FIG.15
− While heater is operating, turn relief valve
clockwise to increase, counter-clockwise to
decrease Use flat blade screwdriver to turn
valve. Correct pump pressure is as follows:
Stock number Pump Pressure (bar)
04174 0.33
04175 0.35
04176 0.37
Tolerance ± 10%
− For best measurement of pressure, test with full
tank of fuel.
Optimum pressure occurs when
the nose cone is cherry red and there are no
extending flames from the heater.
13
14
FIG.
FIG.
15 FIG.
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(1)
(4)
(2)
(2)
(3)