MVT 665 - MVT 675
R E PA I R M A N UA L
5. ADJUSTING MOTOR 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. • Connect two 600 bar pressure gauges as shown above.At maximum drive speed the two gauges should read the same. This signifies that the both sides of the Servo piston are subject to the same pressure and the motor is at its minimum displacement. • To effectively check speed (check the machine technical specifications).
CAUTION The manufacturer performs this regulation -Ref. 1at the bench. It cannot be modified in any way without prior authorization from the manufacturer.
Ref. 1 MINIMUM DISPLACEMENT ADJUSTING SCREW HIGH PRESSURE REGULATION PRESSURE
CHANGEOVER PRESSURE
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-pass). • Watch the two gauges. When the HP gauge shows 260÷280 bar the changeover pressure will drop then the HP will continue to rise until it reaches the setting of the DR valve. • The changeover point can be adjusted by the screw.
Page
61
