Fiat Kobelco EX355 Tier2, Техническое руководство

Страница: 953 / 968

EX355 W5-8-15
STARTING AND CHARGING
7. Inspect the gear for excessive wear and damage.
Replace if required.
8. Rotate the commutator with your hand. Listen for
abnormal noise or rattling from the bearing. Check
for grease leakage. Replace if required.
FIELD COIL
1. Use a circuit tester to check for continuity between
the field coil and the lead wire.
If there is no continuity, a field coil wire is broken.
The field coil must be replaced.
2. Check for continuity between the field coil and the
yoke.
If there is continuity, the yoke must be repaired or
replaced.
BRUSH AND BRUSH HOLDER
1. Measure the brush length. If the brush length is
less than the specified limit, the brush and/or yoke
must be replaced.
Brush length
Standard: 18mm (0.72 in)
Limit: 11 mm (0.44 in)
2. Check the brush spring for weakness and corro-
sion. Replace the spring if required.
3. Use a spring balancer to measure the brush spring
tension. If the spring tension is less than the
specified limit, the spring must be replaced.
Brush spring tension
Standard: 29 - 39 N (3 - 4 kg/6.6 - 8.8 lb)
Limit: 13.7 N (1.4 kg/3.1 lb)
4. Use a circuit tester to check the brush holder
insulation. Touch one probe to the field winding
lead wire and the other probe to the brush. If there
is continuity between the lead wire and the brush,
the insulation is bad. Repair or replace the. brush
holder.
SM7361
SM7362
SM7363