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4.8.7.2
Checking the transmission ratio of a power take-off driven trailer
Check the transmission ratio of a power take-off (PTO) driven trailer.
Before you check the transmission ratio, make sure that the tractor with the trailer
is on a flat, hard-surfaced area or road.
1. Check that the tyres have the correct pressure.
2. Remove the PTO drive shaft.
3. Fasten wire or tape indicators on the PTO shaft of the tractor and on the
trailer drive shaft.
The indicators must be aligned.
4. Drive the tractor together with the trailer slowly forwards.
Ask two people to count simultaneously how many revolutions the tractor and
the trailer shaft each make. Stop counting when the tractor shaft has made
100 revolutions.
5. Compare the figures for the tractor and trailer shafts.
•
If the number of the trailer drive shaft revolutions is higher than 100, the
trailer is slower than the tractor.
The trailer should be 0-3% slower, that is, the trailer shaft should have
revolved 100-103 times. If the number is greater than this, the trailer's
braking effect is too great.
•
If the number of the trailer drive shaft revolutions is lower than 100, the
trailer is faster than the tractor.
In this case, the trailer tends to push, which can endanger the steering of
the tractor.
4.8.8
Steering system
4.8.8.1
Adjusting the steering angle
If the tractor is equipped with the electrohydraulic steering valve, the steering
angle must be adjusted and calibrated at an authorized Valtra workshop.
IMPORTANT: When altering the track width or when fitting a front loader, always
make sure that the front wheels have free movement to full lock with full front axle
oscillation in both directions and that the front axle and the wheels can turn fully.
If necessary, adjust the steering lock stop screws on the powered front axle.
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4. Maintenance
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