VESPA 633844 IT, Руководство по обслуживанию

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Insufficient braking
INEFFICIENT BRAKING SYSTEM
Possible Cause Operation
Inefficient braking system Check the pad wear (1.5 min). Check that the
brake discs are not worn, scored or warped. Check
the correct level of fluid in the pumps and replace
brake fluid if necessary. Check there is no air in
the circuits; if necessary, bleed the air. Check that
the front brake calliper moves in axis with the disc.
Fluid leakage in hydraulic braking system Failing elastic fittings, plunger or brake pump
seals, replace
Brake disc slack or distorted Check the brake disc screws are locked; measure
the axial shift of the disc with a dial gauge and with
wheel mounted on the scooter.
Brakes overheating
BRAKES OVERHEATING
Possible Cause Operation
Defective sliding of pistons Check calliper and replace any damaged part.
Brake disc slack or distorted Check the brake disc screws are locked; use a dial
gauge and a wheel mounted on the vehicle to
measure the axial shift of the disc.
Clogged compensation holes on the pump Clean carefully and blast with compressed air
Swollen or glued rubber gaskets Replace gaskets.
Steering and suspensions
Heavy steering
STEERING HARDENING
Possible Cause Operation
Steering hardening Check the tightening of the top and bottom ring
nuts. If irregularities continue in turning the steer-
ing even after making the above adjustments,
check the seats in which the ball bearings rotate:
if they are recessed or if the balls are squashed,
replace them.
Excessive steering play
EXCESSIVE STEERING CLEARANCE
Possible Cause Operation
Torque not conforming Check the tightening of the top and bottom ring
nuts. If irregularities continue in turning the steer-
ing even after making the above adjustments,
check the seats in which the ball bearings rotate:
Vespa GTV 250 i.e.
Troubleshooting
TROUBL - 3