Checking The Ptt Motor - Yamaha 55DEHD Service Manual

BRKT
5. Remove the O-ring 0, screws q, then
remove the brushes w and springs e.
q
w
e
L
cC
9 Do not pull the PTT motor leads out from
the PTT motor base.
9 Do not deform or damage the bimetal a,
otherwise the operation of the circuit
breaker can be affected.

Checking the PTT motor

1. Check the commutator. Clean with
600–grit sandpaper and compressed air
if dirty.
7-43
Bracket unit
w
a
0
e
G
68870720
6G480220
2. Measure the commutator diameter.
Replace the armature if below specifica-
tion limit.
a
Digital caliper 1:
90890-06704
Commutator standard
diameter a:
22.0 mm (0.87 in)
Wear limit:
21.0 mm (0.83 in)
3. Measure the commutator undercut b.
Replace the armature if below specifica-
tion limit.
Standard undercut b:
1.8 mm (0.07 in)
Wear limit:
1.3 mm (0.05 in)
1
6F680175
b
6F680180
6885J11