Magnum 261800, Repair And Parts Manual, Page: 30 / 52

Motor Diagnostics
30 312004B
Motor Diagnostics
Check for electrical continuity in motor armature, windings and brush as follows:
If Motor Diagnostics reveal a damaged motor or if motor brushes are shorter than 1/4 in. (6.4 mm) or if the motor
shaft cannot turn, replace the motor using
Motor Kit , page 28.
Setup
1. Relieve pressure, page 14.
2. Unplug electric cord.
3. Remove enclosure and disconnect motor leads from
control card.
4. Remove fan brace (if equipped).
5. Remove four screws and front cover.
6. Remove yoke and guide rods.
7. Remove gear.
Armature Short Circuit Spin Test
Quickly turn motor fan by hand. There should not be
electrical shorts and fan should coast two or three
revolutions before stopping. If fan does not spin freely,
armature is shorted. Replace motor using
Motor Kit ,
page 28.
Armature, Brushes and Motor Wiring Open Circuit
Test
1. Connect red and black motor leads together with
test lead.
2. Turn motor fan by hand, about two revolutions per
second.
3. If there is an uneven resistance or no resistance,
replace motor using
Motor Kit , page 28.