Thermo King SB-210, Manual

Page: 84 / 159

Engine Maintenance
84
Engine Speed Adjustments
When the diesel engine fails to maintain the
correct engine speed, check the following before
adjusting the speed:
1. Check the fuel inlet strainer. Check the speed.
2. Bleed the air out of the fuel system. Check the
speed.
3. Bleed the air out of the nozzles. Check the
speed.
Make the engine speed adjustments with the
engine fully warmed up.
High Speed
1. Use the Service Test Mode to run the unit in
high speed and check the high speed rpm. It
should be 2200 ± 25 rpm for the SB-210 and
2600 ± 25 rpm for the SB-310.
2. Shut the unit off.
3. Remove the ball joint from the eye bolt in the
high speed solenoid.
4. Remove the boot from the high speed
solenoid.
5. Pull the plunger out of the solenoid enough to
loosen the jam nut. An Allen wrench placed in
the hex opening in the face of the plunger will
keep the plunger from turning. Turn the
plunger eye bolt clockwise to increase the
speed and counterclockwise to decrease the
speed.
6. Replace the ball joint, start the unit and check
the speed. When the speed is correct, tighten
the jam nut and replace the solenoid boot.
NOTE: If the correct speed cannot be set close
enough with half turns of the eye bolt, use the
Allen wrench to turn the plunger in smaller
increments.
Low Speed
1. Loosen the jam nut on the low speed
adjustment screw.
2. Use the Service Test Mode to run the unit in
low speed. Adjust the screw to obtain the
correct speed. It should be 1450 ± 25 rpm
(1720 ± 25 rpm for SB-310 units with High
Capacity Fresh).
3. Tighten the jam nut and recheck the speed.
Injection Pump Timing
This timing procedure requires fuel pressure at the
injection pump inlet. This can be accomplished by
pumping the priming pump by hand, or by using
an electric fuel pump to supply fuel to the fuel
pump inlet.
1. Press the
O
FF
key to turn the unit off.
2. Remove the round cover (plug) from the
timing mark access hole on the front of the
bell housing. The index marks on either side
of this hole and the timing marks on the
flywheel are used to check the injection pump
timing.
1. High Speed Solenoid
2. Boot
3. Ball Joint
4. Speed Control Rod
5. Low Speed Adjustment Screw
Figure 70: Engine Speed Adjustments
1 2 4 5 3
ARA112