Power Train
Specifications
30
Drive Motor
Machine chamfer on the commutator bars ...0.40 mm
(.016 in.)
Torque for the terminal bolts (not shown) that hold
cable connections ...............................12 N¥m (9 lb¥ft)
Depth of the insulation below commutator
bars ....................................................1.0 mm (.04 in.)
Width of the insulation below commutator
bars ................................................0.76 mm (.030 in.)
Maximum difference between commutator high and
low point (out of round) ...........0.03 mm (.001 in.) TIR
Maximum difference between bar to
bar .......................................0.005 mm (.0002 in.) TIR
Thermal switch (not shown) [Superior (S) Option.
only]:
Opening temperature ...........150
L
6¡C (302
L
11¡F)
Closing temperature ...........130
L
7¡C (266
L
13¡F)
Thermal switch (Not Shown)[Standard only]
Opening Temperature ............135
L
4¡ (275
L
10¡F)
Closing Temperature ..............118
L
6¡ (244
L
11¡F)
Drive Motors
Model
Voltage
(1)
New Brush Size
Minimum
(2)
New Commutator
Minimum
Thickness
B
width
B
length
Brush Length*
Diameter
Commutator Diameter**
B20S-2, B25S-2
36/48
12.5 mm
B
25.0 mm
B
45.8 mm
19.0 mm
117.4 mm
111.0 mm (4.37 in.)
B30S-2
(.49 in.
B
0.98 in.
B
1.8 in.)
(.75 in.)
(4.62 in.)
BC20S-2,
16.0 mm
B
28.0 mm
B
45.8 mm
19.0 mm
119.0 mm
BC25S-2,
36/48
(.63 in.
B
1.10 in.
B
1.80 in.)
(.75 in.)
(4.69 in.)
111.0 mm (4.37 in.)
BC30S-2
B20S, B25S
12.5 mm
B
40.0 mm
B
45.8 mm
19.0 mm
117.4 mm
B30S, BC20S
72/80
(.49 in.
B
1.57 in.
B
1.8 in.)
(.75 in.)
(4.62 in.)
111.0 mm (4.37 in.)
BC25S, BC30S
*As measured manually on standard trucks. As measured by the Brush Wear Indicator (BWI) on Superior (S) option trucks.
**All rough edges (burrs) must be removed after the commutator is machined.
