C2
A + B
Y1
Y2
D
C1
Figure 32. The hydraulic connections of a
4-speed BBC 05 motor with a brake.
A + B
C1
D2a
D2b
D
F1
C2
Y
D2b
F2
Figure 33. The hydraulic connections of a
2-speed BBC 02 motor with the double
brake.
All hydraulic connections of the motor are on the shaft mating surface.
• WORKING LINE PORTS (A and B)
The working lines, aka the feed and return lines of the motor are the high pressure
lines meant for running the motor.
• CASE DRAIN LINE PORT (C or C2) and CASE FLUSHING LINE PORT (C1)
The case drain line is the return line from the housing cavity.
Most of the Black Bruin motors are equipped with the case flushing line (C1). The
flushing line is an extra case line. From a charge pump, or an alternative source,
cool oil from reservoir is fed into motor housing through the flushing line (C1).
The case drain line is marked with C. Motors with case flushing line C1 have a case
drain line marked with C2. The case drain line is used for case drain and returning
flush oil. To ensure motor functionality, C1 line has to be either plugged or used for
flush flow in. C2 is always used for case drain flow out. Do not use C1 as case drain
line.
• BRAKE PRESSURE PORTS (D, D2a and D2b)
The motors with parking brake have brake release line marked with D.
BBC motors with double brake have service brake pilot lines marked with D2a and
D2b.
• BRAKE FLUSHING LINE PORTS (F1 and F2)
BBC motors with double brake have service brake flushing lines marked with F1
and F2.
• PILOT LINE PORTS (Y or Y1 and Y2)
The pilot line is meant for controlling a 2-speed or 4-speed motor (see
on page 29).
Note:
The figures represent motor connections of specific models and are
therefore only suggestive. For detailed information consult the motor
manufacturer or its representatives.
System Design
36
Product Manual
