Engine Maintenance 9-17
TK 482, TK 486 and TK 486V Engines
NOTE: Use the Service Test mode to operate units with a TG-VI, MT µP-IV, µP-V, µP-VI, SR-2 or SR-3 controller. See the
appropriate Controller Operation and Diagnosis manual for instructions.
High Speed
1. Start the unit and check the high speed rpm.
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 counter
clockwise 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. Operate the unit in low speed. Adjust the screw to obtain the correct speed.
3. Tighten the jam nut and recheck the speed.
Integral Fuel Solenoid – TK 482, TK 486 and TK 486V
The fuel solenoid contains 2 coils: the pull-in coil, and the hold-in coil. The pull-in coil draws approximately 35 to 45 amperes
at 12 volts. The hold-in coil draws approximately 1 ampere at 12 volts. The pull-in coil must be energised to move the injection
pump governor linkage to the fuel on position. Once the governor linkage is in the fuel on position, the hold-in coil will keep the
linkage in the fuel on position until the 8D circuit is de-energised. The pull-in coil must be de-energised after a few seconds to
keep it from being damaged.
TK 482, TK 486 or TK 486V Engine: A fuel solenoid timer printed circuit board contains the timer and relay that control the
pull-in coil in the fuel solenoid. Refer to a parts manual for the correct printed circuit board for your unit.
High Speed Adjustment – TK 482, TK 486 and TK
486V Engines
1. Throttle Solenoid
2. Solenoid Boot
3. Ball Joint
4. Control Rod
5. Low Speed Adjustment Screw
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