SWING MOTORS
SUB-SECTION 6C
SUB-SECTION 6C
SWING MOTORS
TESTING
SWING MOTOR (41Z110)
The rate of oil flow from the tail drain, of a stalled motor,
DESCRIPTION
is a measure of the motor's volumetric efficiency. In a new
motor, having maximum practical volumetric efficiency,
Swing motor 41Z110 is a fixed displacement, gear type
the tail drain rate will be approximately 3 GPM (11.3
hydraulic motor. Port connections are located in the motor
I/min). As the motor wears, as it will through normal usage,
body, and the direction of oil flow through these ports
this drain rate will increase and the volumetric efficiency
determines the direction of motor shaft rotation.
will decrease, which will affect the overall performance of
the motor.
Oil entering one of the ports subjects two gear teeth on the
inlet side of the motor to high pressure which tends to
A drain rate of 8 GPM (30.2 I/min) represents a volumetric
rotate the gears as shown in Figure 6C-1. As the gears rotate
efficiency of approximately 80 percent. This is the point a
around the motor housing, they carry the oil that enters the
which consideration should be given to replacing the motor
inlet side of the motor to the outlet side of the motor,
The find decision on whether or not to replace the motor
where the oil is returned to tank.
Figure 6C-1. Swing Motor Operation
6C-1
