RE 15214/03.2017, Bosch Rexroth AG
Features
▶ Low-speed radial-piston design
▶ Short installation length
▶ Industry-standard mounting
▶ Integrated pinion
▶ High volumetric and mechanical efficiency
▶ Smooth operation at very low speed
▶ Low noise and backlash
▶ Anti-shock cross-port relief valves
▶ Anti-cavitation valves
▶ Holding brake
▶ Optional brake release valve with delay function
▶ Frame size MCR3, MCR5
▶ Displacement 160 cc to 820 cc
▶ Maximum pressure 350 bar
▶ Torque output up to 4000 Nm
▶ Open circuits
Radial piston motor for slew drives
MCR-X
RE 15214
Edition: 03.2017
Replaces 01.2014
Contents
Application 2
Functional description 2
Ordering code 4
Technical data 6
Dimensions 8
Selection guide 10
Bosch Rexroth AG, RE 15214/03.2017
2 MCR-X Series 3X | Radial Piston Motor
Application
Application
The MCR-X motors are intended for open-circuit operation
as drive motors for the slewing function primarily of excava-
tors in the 2 to 8 ton weight range (MCR3X for 2 to 4 ton
and MCR5X for 4 to 8 ton). Other possible areas of applica-
tion include slewing for forestry machines and aerial work
platforms.
Functional description
The MCR-X is a low-speed high-torque motor of radial-pis-
ton design. For a description of the operating principle see
Bosch Rexroth data sheet 15195.
Anti-shock relief valves
Pressure relief valves venting to return line are fitted to
facilitate use in open circuits. These valves have an anti-
shock function to limit the rate of rise of pressure and
prevent overly rapid changes in acceleration, thus limiting
the shock felt by the machine operator and extending gear
life. Different valve varients are used depending on the
pressure.
Anti-cavitation valves
During deceleration it is necessary to maintain sufficient
pressure at the motor inlet to hold the pistons against the
cam ring and prevent cavitation. For this reason the motor
is equipped with a make-up port M, which feeds anti-cavita-
tion check valves connected to ports A and B (see schema-
tic diagram on page 5). See Technical data on page 6 for
details of the pressure that is required at port M.
Holding brake
A holding brake is usually required to comply with relevant
equipment standards such as EN474 and is, therefore, fitted
as standard to the MCR-X motor.
A disc pack (3), with alternate discs splined to the brake
shaft and brake housing (4), is compressed by the force of a
disc spring (5) acting through a piston (6). The friction
between the discs generates a holding torque.
When fluid is fed into the annular area (7), the pressure on
the underside of the piston rises, opposing the spring force.
If sufficient pressure is applied (see Technical data on
page6), the piston moves to the right, removing the com-
pression on the disc pack and allowing the motor to turn
freely.
When the pressure is removed the spring forces the piston
back to the left and once again compresses the disc pack.
Thus, the brake is fail-safe.
In case of hydraulic system failure, it may be manually
released by loosening the end cover screws (8).
Notice
Brakes not for dynamic use!
Section of holding brake
1
2
3
4
5
6
7
8
1 4
3
2
6
5
7
8
RE 15214/03.2017, Bosch Rexroth AG
Radial Piston Motor | MCR-X Series 3X
Functional description
3
Brake valve option
The holding brake is designed to be engaged only once the
motor has stopped rotating. Premature engagement can
lead to noise, overheating and wear or seizure of the brake
discs. Thus, there is a need to delay brake engagement
after the control joystick pilot pressure falls to zero, for
sufficient time to allow the machine upperstructure to come
to rest in the worst case of maximum speed and maximum
moment of inertia. For this reason, a brake control valve
with a delay function is offered as an option on the MCR-X.
▼ MCR-X with brake valve
L
M
A
B
X1
X2
Z
F
The valve functions as follows:
▶ The brake release pressure is fed to port Z.
▶ Pilot pressure from the joystick (one line for each direc-
tion) is fed to ports X1 and X2 and an internal shuttle
valve feeds the higher of these to the brake control valve.
▶ If the pilot pressure is sufficient, the valve shifts and the
brake is immediately released.
▶ When the joystick is returned to the centre position,
pilot pressure falls, the valve shifts back and flow is
drained from the brake at a metered rate determined by
the diameter of an orifice within the valve. This mete-
ring of the flow out of the brake results in a delay in
engagement.
Where the brake valve option is not supplied, the above
functions must be implemented externally to the motor.
▼ MCR-X without brake valve
L
M
A
B
Z
F
Speed sensor options
A hall-effect speed sensor may be fitted as an option, giving
a two-channel output of phase-displaced square waves, and
enabling detection of speed and direction. A toothed target
disc is fitted to the motor cylinder block, and the sensor,
fitted to a port in the rear case, produces a pulse on each
channel as each tooth passes in front of it. The frequency
of the pulses is proportional to the rotational speed.
Versions are available for use with regulated supplies
(CodeP1) and for direct connection to a 12 V or 24 V
unregulated supply (CodeP2).
The MCR-X may also be supplied fitted with a target disc
and with a speed sensor port machined, but covered and
sealed with a blanking plate (CodeP0). These “sensor-
ready” motors may be fitted with a sensor at a later date.
Terminal connections
Speed
Sensor
V
Supply
(Pin 1)
Autput Channel 1 (Pin 2)
Ground (Pin 3)
Autput Channel 2 (Pin 4)
Connector ___________________________ Deutsch DT04-4P-E008
Cable length ________________________________________ 600mm
For technical data see standard DO/100/117 (please con-
sult Rexroth Engineering Department in Glenrothes).
Direction of shaft rotation with flow
(view from drive shaft)
Port B Port A
Bosch Rexroth AG, RE 15214/03.2017
4 MCR-X Series 3X | Radial Piston Motor
Ordering code
Ordering code
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
MCR X Z / 3X
Radial piston motor
01 Radial-piston type, low-speed, high-torque motor,
equipped with cross-port relief and anti-cavitation valves
MCR
Frame size
02 Frame size 3
3
5
5
Motor type
03 Slew motor
X
Nominal size, displacement V
g
in cm
3
/rev
04 Frame size 3
160 225 255 280 325 365 400
Low displacement: motors use standard cylindrical pistons
LD ● ● ● – – – –
High displacement motors use stepped pistons
HD – – – ● ● ● ●
Frame size 5
380
470 520 565 620 680 750 820
Low displacement: motors use standard cylindrical pistons
LD ● ● ● ● – – – –
High displacement motors use stepped pistons
HD – – – – ● ● ● ●
Drive shaft
05 Pinion specification: module 6, 14 teeth
G101
Pinion specification: module 6.5, 17 teeth
G126
Pinion specification: module 5, 13 teeth (only MCR3X)
G79
Other
1)
GXXX
Through shaft
06 Without through shaft
Z
Series
07 Series 30 to 39
2)
3X
Brake
08 Hydraulic release multi-disc holding brake
B2
Hydraulic release multi-disc holding brake (only MCR5X)
B4
Seals
09 NBR (nitrile rubber)
M
FKM (fluoroelastomer / Viton)
V
Direction of rotation
10 Viewed from drive shaft: clockwise with flow into port A
1L
Ports
11 Tapped with UNF thread (SAE J514)
12
Tapped to JIS B 2351
64
●
= Available – = Not available
1) Other pinions may be provided to the customer’s specification,
depending on sales volume
2) Series 30 to 39 are dimensionally interchangeable
RE 15214/03.2017, Bosch Rexroth AG
Radial Piston Motor | MCR-X Series 3X
Ordering code
5
Speed sensor
12 Without sensor (no code)
Sensor ready
P0
Sensor without regulator
P1
Sensor with regulator
P2
Valves
13 With brake valve orifice ø0.6 mm
V01
Without brake valve
V02
Other
3)
VXX
Relief setting
14 220 bar
A
Other
B to Z
Special order
15 Two-coat black paint
SO400
Other
SOXXX
Other
16 Mark in text here
*
01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16
MCR X Z / 3X
3) The brake delay orifice must be sized to suit the machine.
ø0.6 mm is the standard size but other diameters may be supplied
depending on the particular case.
Bosch Rexroth AG, RE 15214/03.2017
6 MCR-X Series 3X | Radial Piston Motor
Technical data
Technical data
Frame size MCR3X and MCR5X
Type of mounting Flange mounting via front case
Mounting screws 6 - 8 × M16, Grade 12.9
Minimum mounting screw torque Nm 300
Port type Tapped to SAE J514 or JIS B 2351
Shaft type With integrated pinion (see page 9)
Piston seat material P23 (high efficiency)
Weight
MCR3X kg 39
MCR5X kg 58
Hydraulic fluid
1)2)
Mineral oil type HLP/HLVP to DIN 51524
Fluid cleanliness ISO 4406, Class 20/18/15
Fluid viscosity range
3)
n
min/max
mm
2
/s 10 to 2000
Fluid temperature range t
min/max
°C -20 to +105
Pressure
Maximum pressure at ports A, B and M
4)
p
max
bar 300
Maximum case drain pressure p
case max
bar 10
Minimum pressure at port M
5)6)
p
M min
bar 4
Relief valves
Pressure setting range
8)
bar 100 to 300
Anti-cavitation valves
Cracking pressure bar 0.25
Brake delay valve
Shift pressure p
X shift
bar 3.7
Orifice diameter
9)
mm 0.6
Delay time
9)
s 2.9 to 5.8
Speed sensor
For technical data see standard DO/100/117 (please consult Rexroth Engineering Department in Glenrothes).
Motor Performance MCR3X
7)
Displacement
V
g
cm
3
/rev 160 225 255 280 325 365 400
Maximum speed, Single speed motor (1L) n
max
rpm 375 265 235 215 185 165 150
Maximum torque
4)
T
max
Nm 710 1000 1130 1240 1440 1620 1780
Minimum speed for smooth running n
min
rpm 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Motor Performance MCR5X
7)
Displacement
V
g
cm
3
/rev 380 470 520 565 620 680 750 820
Maximum speed, Single speed motor (1L) n
max
rpm 155 125 115 105 95 85 80 75
Maximum torque
4)
T
max
Nm 1685 2090 2310 2510 2750 3020 3330 3640
Minimum speed for smooth running n
min
rpm 0.5 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Brake
10)
MCR3X MCR5X MCR5X
Holding brake B2 B2 B4
Minimum brake torque
T
br min
Nm 1170 2100 4400
Minimum pressure at which brake release begins
p
rel min
bar 8 8 11
Maximum pressure required to fully release brake
p
rel max
bar 11 11 15
RE 15214/03.2017, Bosch Rexroth AG
Radial Piston Motor | MCR-X Series 3X
Technical data
7
Footer from page 5
1) The motor must be filled with oil prior to start-up. The filler port F
is provided for this purpose.
2) For any other fluid type contact the Engineering Department at
Bosch Rexroth, Glenrothes. For more information on hydraulic flu-
ids, see datasheets 90220 and 90223.
3) With high oil viscosity, there is an increased risk of cavitation, so
p
M
may need to be increased.
The machine should be tested at the minimum operating tempera-
ture to ensure satisfactory operation.
4) An increase in the maximum pressure to 350 bar, and correspon-
ding torque increase, may be possible by special order.
Please consult Rexroth Engineering Department in Glenrothes for
further details.
5) For operation below the quoted make-up pressure, please contact
Rexroth Engineering Department in Glenrothes.
6) The quoted make-up pressure applies at the port M. Please take
pressure drop in the make-up line into account.
Rexroth recommends a minimum make-up line diameter of 5/8in,
but this must be confirmed by machine testing.
7) The quoted values are for initial reference only. Please contact Rex-
roth Engineering Department in Glenrothes for a full
technical evaluation prior to ordering.
8) The setting range quoted applies with standard springs. Extension
of the range may be possible by special order.
9) The standard orifice diameter is quoted, along with the delay time
for ISO VG46 oil at 50 °C. However, the orifice diameter must be
selected to ensure that the brake does not apply before the motor
has stopped rotating. Please contact Rexroth Engineering Depart-
ment in Glenrothes for further information.
10) The holding brake must be applied only in the static condition. Ap-
plication of the brake while the motor is turning may result in da-
mage to the unit and reduction in holding torque. The machine de-
signer must ensure that an adequate brake delay exists to prevent
this. The brake is, however, applied with a noise-reduction coating,
to prevent brake squeal during short-duration drive-through caused
by swing ram operation.
Note
▶ Motor performance values are based on theoretical
calculations.
▶ Efficiencies are not taken into consideration for theore-
tical calculations.
▶ Brake torque accounts for tolerances. Values are based
when used with standard mineral oil (HLP).
Please refer the related foot notes for more details.
Bosch Rexroth AG, RE 15214/03.2017
8 MCR-X Series 3X | Radial Piston Motor
Dimensions
Dimensions [mm]
Dimensions
B
M
L
X1
X2
A
Z
L3
L2
L4
D1
L6
L5
L7
A1
B1
RX
RA
RM
Z1
F1
L1
D4
D3
D2
RL
D8
D5
D6
D7
Motor D1 D2 D3 D4 D5 D6 D7 D8 L1 L2 L3 L4 L5 L6 L7
MCR3X ø175 ø79 ø69 ø174 ø220 ø248 ø190 ø17 315 15 8 17 15 191 132
MCR5X ø200 ø112 ø91 ø174 ø265 ø300 ø228 ø17.5 334.7 15 7 16 18 215.5 157
Motor A1 B1 Z1 F1 RM RA RL RX
MCR3X 29.5 29.5 13 72 94 132 123.4 171
MCR5X 40 40 31.5 90 125.5
152
155.2 195.5
The drawings are for initial guidance only.
Before finalizing your design, request a binding installation drawing.
RE 15214/03.2017, Bosch Rexroth AG
Radial Piston Motor | MCR-X Series 3X
Dimensions
9
Dimensions [mm]
MCR-X Series 3X
Drive shaft
G101 G126 G79
ø101
+0.0
-0.2
103.9±0.85
64±0.3
25
M12
16.25±0.2
67.9
58±0.3
ø125.98±0.1
M12
99.5±0.7
25
63.5
20±0.2
91.1±0.925
56.95±0.3
ø78.9
ø7±0.2
58
+0.09
−0.03
20±0.2
Pinion data G101 G126 G79
Module mm 6 6.5 5
No. of teeth 14 17 13
Pressure angle ° 20 20 20
Addendum mod. coefficient 0.5 0.4 0.4
Dimension over pins mm 102.88±0.05 128.64±0.04 81.7±0.09
Pin diameter mm 10.5 11 9.60
Crowning mm 0.0115/0.1035 0.0762/0.1016 0.0762/0.102
Accuracy grade (ISO1328) 8 8 8
Ports
Designation Port function
Ordering
code 12
Size
Ordering
code 64
Size Maximum pressure
[bar]
State
1)
A, B Inlet, outlet SAE J514 3/4-16 UNF JIS B 2351 G3/8 in 300 O
M Anti-cavitation SAE J514 3/4-16 UNF JIS B 2351 G3/8 in 300 O
X1, X2 Brake pilot SAE J514 9/16-18 UNF JIS B 2351 G1/4 in 70 O
L Case drain SAE J514 9/16-18 UNF JIS B 2351 G1/4 in 10 O
Z Brake port SAE J514 9/16-18 UNF JIS B 2351 G1/4 in 40 O
F Filler port SAE J514 3/4-16 UNF SAE J514 3/4 in - 16 UNF 10 X
1) O = Must be connected (plugged on delivery)
X = Plugged (in normal operation)
Centre of
crowning
Centre of
crowning
Centre of
crowning
10
Bosch Rexroth AG, RE 15214/03.2017
MCR-X Series 3X | Radial Piston Motor
Selection guide
Bosch Rexroth Limited
Viewfield Industrial Estate
Glenrothes, Fife
Scotland, KY6 2RD
UK
Phone +44 15 92 631 777
Telefax +44 15 92 631 936
www.boschrexroth.com
© BoschRexrothAG2017. All rights reserved, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event of
applications for industrial property rights. The data specified within only
serves to describe the product. No statements concerning a certain condi-
tion or suitability for a certain application can be derived from our informa-
tion. The information given does not release the user from the obligation of
own judgment and verification. It must be remembered that our products are
subject to a natural process of wear and aging.
Selection guide
Data sheet Motor type Frame size
Application 3
160..400 cc
5
380..820 cc
6
820..920 cc
10
780..1340 cc
15
1130..2150 cc
20
1750..3000 cc
15198 MCR-F
Wheel drives
● ●
–
● ●
–
15200 MCR-W
Heavy duty
wheel drives
● ●
–
●
– –
15195 MCR-A
Frame integrated drives
● ●
–
● ●
–
15199 MCR-H
Integrated drives
● ●
–
● ● ●
15221 MCR-T
Track drives
–
● ● ●
– –
15223 MCR-R Series 41
Hydraulic drive assist
– – –
●
– –
15214 MCR-X
Slew drives
● ●
– – – –
15197 MCR-C
Compact drives
– – – – –
●
15196 MCR-D
Industrial applications
● ●
–
●
– –
MCR-E
Industrial applications
–
●
– – – –
RE 15214/03.2017, Bosch Rexroth AG
11 Radial Piston Motor | MCR-X Series 3X
12
Bosch Rexroth AG, RE 15214/03.2017
Bosch Rexroth Limited
Viewfield Industrial Estate
Glenrothes, Fife
Scotland, KY6 2RD
UK
Phone +44 15 92 631 777
Telefax +44 15 92 631 936
www.boschrexroth.com
© BoschRexrothAG2017. All rights reserved, also regarding any disposal,
exploitation, reproduction, editing, distribution, as well as in the event of
applications for industrial property rights. The data specified within only
serves to describe the product. No statements concerning a certain condi-
tion or suitability for a certain application can be derived from our informa-
tion. The information given does not release the user from the obligation of
own judgment and verification. It must be remembered that our products are
subject to a natural process of wear and aging.
MCR-X Series 3X | Radial Piston Motor