Yanmar 1GM User Manual page 200

194
CHAPTER NINE
Closed spring
end
Yoke
11. To replace ground (negative) brushes, remove the
brush lead attaching screws from the starter frame. Re-
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move the brushes and install new ones.
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12. To replace field coil brushes, cut the insulated brush
leads as close as possible to the field coils. Attach new
brush leads and solder the connections together with rosin
core solder and a 300-watt soldering iron.
NOTE
Always replace brushes in complete sets.
13. Install the brush end holder.
14. Pull back and hold the brush retaining clip with a wire
hook, then install the brush. Repeat this step to install the
remaining brushes. Make sure the brush springs rest in the
small cutout on top of each brush.
15. Reassembly is the reverse of Steps 1-6.
3HM and 3HM35 models
Brush replacement requires partial disassembly of the
starter.
1. Disconnect the positive lead (23) from the solenoid.
2. Remove the brush holder retaining screws (31, Figure
17).
3. Remove the two throughbolts (33, Figure 17).
4. Separate the end cap (29) from the starter.
5. Note the position of the brushes in the brush holder.
Use a suitable tool to pull back and hold the brush retain-
ing clip, then remove the brush. See Figure 20, typical.
Repeat this step to remove the remaining brushes.
6. Remove the brush holder from the armature shaft.
7. Use an ohmmeter or self-powered test lamp to check
for continuity between the insulated brush holder and the
base of the brush holder assembly. See Figure 21. Ifthere
is continuity, replace the brush holder.
8. Inspect brush and brush spring condition. Measure
brush length. Replace all brushes if any are oil-soaked or
worn to 14 mm (0.55 in.) or less in length. Replace any
broken or distorted brush springs.
9. To replace ground (negative) brushes, remove the
brush lead attaching screws from the starter frame. Re-
move the brushes and install new ones.
10. To replace field coil (positive) brushes, cut the insu-
lated brush leads as close as possible to the field coils. At-
tach new brush leads and solder the connections together
with rosin core solder and a 300-watt soldering iron.
NOTE
Always replace brushes in complete sets.
11. Install the brush end holder.
12. Pull back and hold the brush retaining clip with a wire
hook, then install the brush. Repeat this step to install the
remaining brushes. Make sure the brush springs rest in the
small cutout on top of each brush.
13. Reassembly is the reverse of Steps 1-4.