Test for Ground
Use a DMT multimeter (R x 1 scale). Place one lead of the meter on the armature shaft and the other lead on the commutator.
If continuity is indicated, armature is grounded and must be replaced.
a - DMT multimeter
b - Armature
c - Commutator
d - Armature shaft
DMT 2004 Digital Multimeter 91‑892647A01
Meter Test Leads Meter Scale Reading (Ω)
Red Black
Commutator Armature shaft R x 1 No continuity (OUCH)
Checking and Cleaning Commutator
NOTE: If the commutator is worn, it can be turned down on an armature conditioner tool or on a lathe.
Clean the commutator with number 00 sandpaper.
Field Tests
IMPORTANT: The commutator end of the armature must be installed in brushes when performing the following tests.
DMT 2004 Digital Multimeter 91‑892647A01
Meter Test Leads Meter Scale Reading (Ω)
Red Black
Green motor wire Blue motor wire R x 1 0
1. If specific readings are not obtained, check for:
•
Defective armature
• Dirty or worn brushes
• Dirty or worn commutator
2. If defective components are found, repair or replace the component and retest.
Motor Inspection
Brush replacement is required if brushes are pitted, chipped, or if the distance between the brush pigtail and end of brush
holder slot is less than 1.6 mm (0.063 in.).
Brush Replacement
1. Remove the three screws securing the brush and breaker components to the motor bracket.
2. Remove the breaker.
Power Tilt
Page 5B-22 © 2018 Mercury Marine 90-8M0125265 eng NOVEMBER 2017
To Next Page
Loading...
Need help?
General