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
Summary of Contents for 633844 IT
Page 4: ......
Page 6: ......
Page 7: ...INDEX OF TOPICS CHARACTERISTICS CHAR ...
Page 21: ...INDEX OF TOPICS TOOLING TOOL ...
Page 34: ...Tooling Vespa GTV 250 i e TOOL 14 ...
Page 35: ...INDEX OF TOPICS MAINTENANCE MAIN ...
Page 48: ...Maintenance Vespa GTV 250 i e MAIN 14 ...
Page 49: ...INDEX OF TOPICS TROUBLESHOOTING TROUBL ...
Page 53: ...INDEX OF TOPICS ELECTRICAL SYSTEM ELE SYS ...
Page 86: ...Electrical system Vespa GTV 250 i e ELE SYS 34 ...
Page 87: ...INDEX OF TOPICS ENGINE FROM VEHICLE ENG VE ...
Page 94: ...Engine from vehicle Vespa GTV 250 i e ENG VE 8 ...
Page 95: ...INDEX OF TOPICS ENGINE ENG ...
Page 152: ...Conceptual diagrams LUBRICATION CIRCUIT Engine Vespa GTV 250 i e ENG 58 ...
Page 153: ...Vespa GTV 250 i e Engine ENG 59 ...
Page 161: ...INDEX OF TOPICS INJECTION INJEC ...
Page 178: ... REMOTE CONTROLS CONTROL UNIT FUSES ETC Injection Vespa GTV 250 i e INJEC 18 ...
Page 182: ...Remove the filter from the pump support Injection Vespa GTV 250 i e INJEC 22 ...
Page 194: ...Injection Vespa GTV 250 i e INJEC 34 ...
Page 203: ...SIGNAL CONTROL Vespa GTV 250 i e Injection INJEC 43 ...
Page 206: ...Injection Vespa GTV 250 i e INJEC 46 ...
Page 207: ...INDEX OF TOPICS SUSPENSIONS SUSP ...
Page 228: ...Suspensions Vespa GTV 250 i e SUSP 22 ...
Page 229: ...INDEX OF TOPICS BRAKING SYSTEM BRAK SYS ...
Page 245: ...INDEX OF TOPICS COOLING SYSTEM COOL SYS ...
Page 248: ...Cooling system Vespa GTV 250 i e COOL SYS 4 ...
Page 249: ...INDEX OF TOPICS CHASSIS CHAS ...
Page 262: ...Chassis Vespa GTV 250 i e CHAS 14 ...
Page 263: ...INDEX OF TOPICS PRE DELIVERY PRE DE ...
Page 267: ...INDEX OF TOPICS TIME TIME ...