VESPA 664787, Service Station Manual

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Brakes overheating
BRAKES OVERHEATING
Possible Cause Operation
Defective sliding of pistons Replace the calliper.
Brake disc or drum deformed Using a dial gauge, check the planarity of the disk with the
wheel correctly fitted or the concentricity of the rear drum.
Electrical system
Battery
BATTERY
Possible Cause Operation
Battery The battery is the electrical device in the system that requires
the most frequent inspections and thorough maintenance. If the
vehicle is not used for some time (1 month or more) the battery
needs to be recharged periodically. The battery runs down
completely in the course of 5 ÷ 6 months. If the battery is fitted
on a motorcycle, be careful not to invert the connections, keep-
ing in mind that the black ground wire is connected to the
negative terminal while the red wire is connected to the terminal
. Follow the instructions in the ELECTRICAL SYSTEM
chapter for the recharging of the batteries.
Steering and suspensions
Heavy steering
STEERING HARDENING
Possible Cause Operation
Torque not conforming Check the tightening of the top and bottom ring nuts.
If irregularities continue in turning the steering even after mak-
ing the above adjustments, check the seats in which the ball
bearings rotate: replace if they are recessed.
Excessive steering play
EXCESSIVE STEERING CLEARANCE
Possible Cause Operation
EXCESSIVE STEERING CLEARANCE Check the tightening of the top and bottom ring nuts.
If irregularities continue in turning the steering even after mak-
ing the above adjustments, check the seats in which the ball
bearings rotate: replace if they are recessed.
Noisy suspension
NOISY SUSPENSION
Possible Cause Operation
NOISY SUSPENSION If the front suspension is noisy, check: the efficiency of the front
shock absorbers; the condition of the ball bearings and relevant
Troubleshooting
Vespa S 50 2T
TROUBL - 42