Power Train

Page 26

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Volvo Bus Service and Maintenance Manual

 Automatic transmission
46 Depress the accelerator pedal and check the transmission modulator function.
 

Modulator adjustments

Allison, modulator control

1.Adjust the pivot joint so that the modulator cable runs into the bottom position at full throttle.
Allison, modulator control
2.From this position, screw the pivot joint in 5 turns (5 mm).

ZF, electrical modulation, early production

When the injection pump throttle arm is in the full throttle position, the opposite edge of the adjusting arm should be 0.2 mm or max. 0.5 mm from the edge of the shoulder on the position indicator marked "high". Incorrect adjustment will have a negative effect on the gear-changing points.

ZF, electrical modulation, early production

Concerning the Voith automatic transmission, see Service Manual, Section 3 (36-38), Electrical System.

ZF electrical modulation, late production

(B10M ch.no. 16043-, B10R ch.no. 4537-)

When the injection pump throttle arm is in the full throttle position, the boss on the adjusting arm should be in line with the longer adjusting boss (1) on the modulator. This is checked by feeling with the fingers that the bosses are opposite each other. The check can be carried out both at the end's and the top side's boss (1).

When the injection pump throttle arm is in the low idle position, the adjusting arm boss should coincide with the shorter adjusting boss (2) on the modulator. Any adjustment to the modulator setting must always be done in the full-load position.

ZF, electrical modulation, late production
1.Full-load position
2.Low idle
3.Adjusting bosses
4.Stop bosses for adjusting arm