SPECIFICATIONS

Vehicle Systems Systems Operation
Electric Motors
Hydraulic Pump Motor
Electric Motor
(1) Cover. (2) Thermal Switch. (3) Motor frame. (4) Brush. (5) Commutator. (6) Armature. (7) Field coil. (8) Fan.
1
2
3
4
5
6
7
8
20
The hydraulic system is operated by a direct current
(DC) motor. Electric storage batteries are the source
of power for the (DC) motor.
The hydraulic pump motor is a compound wound
motor and uses high temperature insulation.
Armature (6) is mounted with single row ball
bearings at each end. The ball bearings are perma-
nently lubricated with high temperature lubricant.
The electrical connections to the motor are made at
corrosion resistant terminals on motor frame (3). On
the outside of the motor frame is cover (1) that can
be removed for easy access to brushes (4) and
commutator (5). Field coils (7) are fastened to the
inside of the motor frame.
The motor brushes are held in the four brush
holders.
The 72/80V ÒSÓ motors have four brushes (4) and
springs, while 36/48V ÒSÓ motors have eight brushes
(4) and springs. The spring holds the brushes
against commutator (5) and makes compensation for
brush wear.
The parts of armature (6) include the shaft, core,
windings and commutator.