TRANSMISSION INSPECTION AND ADJUSTMENTS
5.
ADJUSTING MOTOR A 6VM DISPLACEMENT CHANGEOVER A) CHECK MINIMUM DISPLACEMENT (MAX. SPEED) : •
The check is made driving the truck on level ground with the engine a full speed in forward drive.
HIGH PRESSURE
REGULATION PRESSURE
A 6 VM DA Serial 60
HIGH PRESSURE
REGULATION PRESSURE
A 6 VM DA Serial 63
CHANGEOVER PRESSURE
CHANGEOVER PRESSURE
• Connect two 600 bar pressure gauges as shown above. At maximum drive speed the two gauges should read the same. This signifies that both sides of the Servo piston are subject to the same pressure and the motor is at its minimum displacement.
B) CHECK START OF REGULATION : • With the wheels raised from the ground and the truck supported on blocks gradually apply the brake pedal to raise the pressure in the HP circuits (inching valve by-passed).. • Watch the two gauges. When the HP gauge shows 200/250 bar the changeover pressure will drop then the HP will continue to rise until it reaches the setting of the DR valve. (Changeover pressure : See specification for different trucks). • The changeover point can be adjusted by the screw.
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