Page 428
REPAIR INSTRUCTIONS, PART 2
519
Figure 519 — Actuator Line Connections
The VTG system must be re-calibrated for proper
open and closed vane-position voltages after
installation and adjustment of the VTG actuator.
14. Reinstall all accessory items, ducting, etc.,
that were removed to gain access to the
VTG turbocharger and related system
components. Replace all fluids drained from
the engine and reconnect the batteries.
15. Operate the engine at low idle for at least
three minutes after completing the
installation of the turbocharger and before
driving the vehicle.
VTG Actuator Removal and
Installation
A damaged and/or malfunctioning VTG actuator
can be serviced as a separate unit without
replacing the complete turbocharger assembly. A
replacement VTG actuator kit is available through
the MACK Parts System. Use the following
procedure to reinstall the original actuator or to
install a new unit.
VTG ACTUATOR REMOVAL
1. Disconnect the air line from the VTG
actuator.
2. Connect a shop air pressure line to the air
fitting at the top of the actuator assembly
(Figure 520) and apply 40–60 psi air
pressure to extend the actuator rod
downward.
Use care in applying air pressure to the actuator
assembly. DO NOT apply pressure greater than
100 psi to the actuator at any time, as damage to
the actuator diaphragm may result.
520
Figure 520 — Air Pressure Application
3. Remove the C-clip and remove the pin
connecting the actuator rod to the vane
operating lever clevis (Figure 521).
1. Actuator Air Line
2. VTG Position Sensor
3. VTG Actuator Assembly
1. Shop Air Supply Line 2. VTG Actuator Assembly
5-111.bk Page 428 Monday, July 10, 2006 2:26 PM
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