PTT motor
9-53
Removing the reservoir
Before removing the reservoir, make sure
that the PTT rams are fully extended. Oth-
erwise, fluid could be expelled forcefully
from the PTT unit due to internal pressure.
Disassembling the PTT motor
1. Remove:
• Stator “1”
When removing or installing the armature
along with the motor base assembly, se-
cure the end of the armature shaft using a
pair of pliers. Otherwise, the armature
could separate from the motor base as-
sembly due to the magnetic force of the
stator and damage the brushes.
Checking the PTT motor
1. Check:
• Commutator
Dirty → Clean using 600-grit sandpaper
and compressed air.
2. Measure:
• Commutator diameter “a”
Out of specification → Replace the arma-
ture.
3. Measure:
• Commutator undercut “a”
Out of specification → Replace the arma-
ture.
4. Check:
• Armature for continuity
Out of specification → Replace the arma-
ture assembly.
Standard commutator diameter
28.00 mm (1.1024 in)
Wear limit
27.00 mm (1.0630 in)
Standard commutator undercut
1.00 mm (0.0394 in)
Wear limit
0.50 mm (0.0197 in)
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