Thermo King 920000, Manual

Page: 88 / 190

Engine Maintenance
88
Fuel Solenoid System
The fuel solenoid is located on the end of the
injection pump. It contains two coils: the pull-in
coil, and the hold-in coil. The pull-in coil draws
approximately 18 to 25 amps at 12 volts. The
hold-in coil draws approximately 1 amp at
12 volts.
The pull-in coil must be energized to move the
injection pump governor linkage to the fuel on
position. Once the injection pump governor
linkage has been moved to the fuel on position,
the hold-in coil will keep it in fuel on position
until the 8D circuit is de-energized. The pull-in
coil must be de-energized after a few seconds to
keep it from being damaged.
A fuel solenoid timer is used to control the fuel
solenoid pull-in coil. The fuel solenoid timer
consists of a small PC board that contains some
electrical components, a four pin wire connector,
and a removable relay called the fuel solenoid
relay. The fuel solenoid timer is mounted inside
the control box.
1. Four Pin Connector
2. Fuel Solenoid Relay (FSR)
Figure 40: Fuel Solenoid Timer
1
2
AGA337
1. Fuel Solenoid
2. Throttle Lever
Figure 41: Fuel Solenoid Location
AEA630