Malibu V6-191 3.1L VIN M SFI (1997)
Hydraulic Assembly: Service and Repair
Gear Replacement
WARNING: To help avoid personal injury, due to a retained load on the ABS hydraulic modulator, the GEAR TENSION RELIEF function of
the scan tool must be performed prior to removal of the ABS hydraulic modulator.
CAUTION: Do not attempt to repair damaged motor packs or hydraulic modulation. Other than modulator drive gear replacement, repair of these
assemblies is not authorized. Do not lubricate or oil gears or motor pack.
DISASSEMBLE
1. Hydraulic Modulator Assembly.
2. Screws attaching gear cover.
3. Motor pack to hydraulic modulator screws.
NOTE: Take care in handling the motor pack. If dropped or damaged in the handling, the motor pack must be replaced.
4. Separate motor pack from hydraulic modulator.
NOTE: Do not allow gear to turn while removing the retaining nut, since the modulator piston can hit the top of the modulator bore, damaging
the piston. Turn the modulator gear to position the piston in the center of its travel. Place a screwdriver through the holes in the gears (not between
the gears) into the recessed hole in the modulator base. This will prevent the gear from turning, aiding in gear removal.
5. Three modulator drive gear to modulator drive shaft retaining nuts.
6. Gears from modulator.
ASSEMBLE
NOTE: Do not allow gear to turn while tightening the retaining nut, since the modulator piston can bottom out in the modulator bore damaging
the piston. Turn the modulator gear to position the piston in the center of its travel. Place a screwdriver through the holes in the gears (not between
the gears) into the recessed hole in the modulator base. This will prevent the gear from turning, aiding in gear installation.
1. Position hydraulic modulator drive gears onto hydraulic modulator drive shaft.
2. Three gear retaining nuts. Tighten Nuts to 8.5 Nm (76 inch lbs.).
3. With the hydraulic modulator upside down, and the gears facing you, rotate each hydraulic modulator gear counterclockwise until movement
