Troubleshooting; Replacement Of Rotor And Vane - Doosan DX140R Shop Manual

TROUBLESHOOTING

On some pumps the ON-OFF switch is installed separately at a
remote location.
A thermal limiter, built into the motor, will automatically shut off
power if motor is overheating to protect it from being damaged.
NOTE: OPEN TEMP: 150 ±5°C (302 ±41°F). After circuit is
automatically shut off due to overheating the pump
will stop running. When temperature drops below
143°C (289°F) the circuit will reactivate allowing the
pump to restart.
Check resistance at connectors "A." If reading is zero, or very
close to zero, the motor is bad and must be replaced.
On units equipped with a toggle switch, check the resistance
through the toggle switch, while the switch is in the "ON"
position. If continuity is not present, the switch is bad. Be sure to
check resistance through the motor.
REPLACEMENT OF ROTOR AND
VANE
If dirt or other foreign materials enter the pump during operation,
it can become lodged between the rotor and/or vanes and
generate heat which can cause the pump damage.
Remove the pump cover and check the rotor and vane. If any
pump parts or components become lost, damaged or
inoperable, immediately replace them with new ones.
Fuel Transfer Pump
Connector "B"
IV
V
Figure 3 WITH TOGGLE SWITCH
IV
Figure 4 WITHOUT TOGGLE SWITCH
Figure 5 WITHOUT TOGGLE SWITCH
Switch Cover
Connector "A"
III
FG003882
Connector "A"
III
V
FG001145
FG000670
SP000021
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