Westerbeke 7.0 KW BGC -60Hz Technical Manual page 101

3. Brushes and Brush Holders
a. Check brushes. If the brushes are worn over the service limit, replace them.
b. With the brush holders assembled to
the commutator, check the brush
spring tension. If the spring tension
has decreased over the service limit,
replace it.
c. Check continuity between the positive
brush holder and the brush holder
base. In case of continuity, replace
the holder assembly.
d. Check the brush holder caulk.
4. Armature
Description
Bush spring
tension
1.2 KW
Bush length
a. Check the armature coil using a growler tester. If
the armature is shorted, replace it.
Also, check for continuity between the armature
and the commutator shaft. Replace it, if defective.
b. Measure the commutator
0.0.
and the depth of
undercut. Correct or replace the commutator if
defective. Also, check the commutator outside
surface for dirtiness and roughness. Polish the
commutator, if rough, with sand paper No. 300 to
400.
5. Field Coil
a. Check for continuity at both ends of the coil
(between brushes). If no current is flowing, the
coil is broken. Replace the yoke assembly.
b. Check for continuity between the connector and
the yoke. If current is flowing, the coil is
grounded. In this case, check the insulated con-
dition and correct it. Replace the yoke assembly
if not repairable.
c. Check the staked condition of poles and check
the coil and other parts for looseness.
97
Standard Value Service Limit
1.5 kg (3.31 Ibs) 0.7 kg (1.54 Ibs)
1.7 mm (0.67 in. ) 11.5 mm (0.45 in.)
Westerbeke Generators