Internal Gear Pumps
Series QX
Issue: 11.2011
Reference: 100-P-000021-E-10
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
Contents Page
1 General 5
1.1 Product description 5
1.2 Advantages 5
2 Technical data 5
2.1 General (deviating values according manufacturer's specification) 5
2.2 Main characteristics for pressure range 16
2.3 Main characteristics for pressure range 27
2.4 Main characteristics for pressure range 37
3 Performance graphs 8
3.1 Noise level (Lp) 8
3.2 Efficiency (η) 8
3.3 Operation with varialble-speed drives 9
4 Single pumps 10
4.1 Dimensions 10
4.2 Pressure range 1 11
4.3 Pressure range 2 11
4.4 Pressure range 3 12
4.5 Ordering code for single pumps 12
4.6 Standard configuration 12
4.7 Options 12
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5 Double pumps 13
5.1 Selection table 13
5.2 Dimensions 14
5.3 Ordering code for double pumps 23
6Triple
7 Low-flow capability pumps 26
pumps 24
6.1 Selection table 24
6.2 Ordering code for triple pumps 25
7.1 Generals 26
7.2 Technical date 26
7.3 Main characteristics 26
7.4 Volumetric efficiency (η)27
7.5 Single pumps 27
7.6 QX24 pumps combined with other QX-singel pumps 28
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Internal Gear Pump QX
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8 Fluid cleanliness 29
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9 Fluid cleanliness 29
10 Operational reliability 29
11 Note 29
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12 Accessories 30
12.1 Bolt-on valves - SAE J518 code 61 / ISO 6162-1 pattern 30
12.2 Pipe flanges - high pressure type 31
12.3 Low pressure type 31
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
1 General
1.1 Product description
The QX pumps are the 5th generation of Bucher internal
gear pumps, which have proven themselves in thirty years
of service around the world. Numerous improvements have
been made to the straightforward and robust design.
Advances in the manufacturing process have made it poss
ible without making higher demands on individual compo
nents to build pumps that are considerably lighter and more
compact.
A new tooth profile, conceived and optimised with the help
of CAE, has yielded another significant reduction in noise
levels. Large sealing areas result in higher efficiencies.
The internal gear ring is supported by a hydrodynamic/ hy
drostatic lubricating film, which allows operation at low vis
cosities or low and high speeds. QX pumps are therefore
suitable for use with variable speed drives, where they can
provide variable deliveries.
1.2 Advantages
S extremely long service life
S sound pressure level < 57 dB (A)
S volumetric efficiency up to 98%
S suitable for use with variable speed drivers
S can be used with fireresistant fluids (HFB, HFC and HFD
= QXV), fuels, biodegradable and low-viscosity fluids
S certifications by ATEX 2, ABS, DNV, GL, LR, NK, ...
S low flow and pressure pulsations
2 Technical data
2.1 General (deviating values according manufacturer's specification)
Installation attitude unrestricted
Mounting method (standard) oval 2-hole flange to ISO 3019/1 (SAE): QX 3 to 6
oval 2-hole flange to ISO 3019/2 (metric) QX 2 and 8
Direction of rotation CW, alternatively CCW (but not reversible)
Pump drive method in-line, through a flexible coupling
Volumetric efficiency η
Fluids HLP mineral oils to DIN 51524, Part 2
Minimum fluid cleanliness NAS 1638, Class 9 or ISO 4406, code 20/18/15 (see page 29)
Operating viscosity
Starting viscosity
Fluid temperature range HLP-mineral oils - 80 _C max./ -20 °C min. (Considering viscosity field)
Inlet pressure maximum
minimum
Startup against pressure maximum 20 bar (higher values, contact Bucher Hydraulics)
v
better than 95%
HFC fluids to VDMA 24317
10 to 100 mm2/s
10 to 300 mm
HFC 50_C max.
1.5 bar absolute (without external drain connection)
0.5 to 0.98 bar absolute (dependent on pump frame size and speed,
see example in section 3.3.2)
2
/s (higher values, contact Bucher Hydraulics)
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Internal Gear Pump QX
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IMPORTANT. The main characteristics are valid for hydraulic oils DIN 51524 with a viscosity of 20 to 50 mm2/s.
The operating pressure at the pump outlet side is specified also for fire-resistant and environmen
tally-friendly fluids (HFC).
2.2 Main characteristics for pressure range 1
Displacement Flow rate
effektiv
[cm3/rev]
1)
10,3
12,6
15,9
20,0
25,3
31,2
40,7
50,3
64,7
78,6
101,1
127,3
160,5
202,1
249,7
326,0
402,6
498,5
at speed
1450 min
p = 0 bar
[l/min] [rpm]
14,9
18,3
23,0
29,0
36,7
45,2
59,0
72,9
93,8
114
146
184
232
293
362
472
583
722
Maximum
-1
1800
1800
1800
1800
1750
1750
1500
speed
3600
3600
3600
3000
3000
3000
3000
2600
2300
2300
2100
Code operating pressure at the pump
outlet side
continuous
[bar]
5)
6)
6)
6)
6)
6)
6)
QX21-010
QX21-012
QX21-016
QX31-020
QX31-025
QX31-032
QX41-040
QX41-050
QX41-063
QX51-080
QX51-100
QX51-125
QX61-160
QX61-200
QX61-250
QX81-315
QX81-400
QX81-500
Mineral
160
125
100
160
125
100
160
125
100
160
125
100
160
125
100
160
125
100
oil
HFC
130
100
80
130
100
80
130
100
80
130
100
80
130
100
80
130
100
80
intermittent
[bar]
Mineral
oil
210
160
125
210
160
125
210
160
125
210
160
125
210
160
125
210
160
125
Torque Input power
2)
HFC [Nm]
180
135
100
180
135
100
180
135
100
180
135
100
180
135
100
180
135
100
26
25
25
51
50
50
104
100
103
200
201
203
409
402
397
830
801
793
3)
[kW]
4)
4,0
3,8
3,9
7,7
7,7
7,5
15,7
15,2
15,6
30,4
30,5
30,8
62,0
61,0
60,4
126,0
121,6
120,5
2.2.1 Suction arrangements for pump types QX61 and QX81
Minimum inlet pressure is 0.95 bar absolute with viscosity 10... 100 mm2/s
(other values, contact Bucher Hydraulics)
Speed 1500 rpm
Suction height
up to 150 mm over 150 mm up to 150 mm over 150 mm
QX61-160 l l l ll
QX61-200 l l l ll
QX61-250 l ll ll ll
QX81-315 l ll ll ll
QX81-400 ll ll ll -
QX81-500 ll ll - -
l = standard pump with one suction port
ll = model with two suction ports
All pump types coded II can be used without the second suction port up to 1200 rpm
Speed 1800 rpm
Suction height
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
2.3 Main characteristics for pressure range 2
Displacement Flow rate
effektiv
[cm3/rev]
1)
5,1
6,3
8,0
10,0
12,6
15,6
20,4
25,1
32,4
39,3
50,6
63,7
80,2
101,0
124,8
163,0
201,3
249,2
at speed
1450 min
p = 0 bar
[l/min]
7,4
9,1
11,5
14,5
18,3
22,6
29,5
36,4
46,8
56,9
73,2
92,1
116
146
181
236
291
361
Maximum
-1
speed
[rpm]
3600
3400
3200
2800
2500
2300
2000
1800
1750
1500
7)
7)
7)
7)
7)
7)
Code operating pressure at the pump
outlet side
continuous
[bar]
Mineral
oil
HFC
intermittent
[bar]
Mineral
oil
QX22-005
QX22-006
210 180 250 210
QX22-008
QX32-010
QX32-012
210 180 250 210
QX32-016
QX42-020
QX42-025
210 180 250 210
QX42-032
QX52-040
QX52-050
210 180 250 210
QX52-063
QX62-080
QX62-100
210 180 250 210
QX62-125
QX82-160
QX82-200
210 180 250 210
QX82-250
Torque Input power
2)
HFC [Nm]
17
21
27
34
42
52
68
84
108
132
170
213
268
338
417
544
672
833
3)
[kW]
4)
2,6
3,2
4,0
5,1
6,4
7,9
10,4
12,7
16,5
19,9
25,7
32,3
40,7
51,2
63,4
82,7
102,1
126,5
2.4 Main characteristics for pressure range 3
Displacement Flow rate
effektiv
[cm3/rev]
1)
5,1
6,3
8,0
10,0
12,6
15,6
20,4
25,1
32,4
39,3
50,6
63,7
80,2
101,0
124,8
163,0
201,3
249,2
1) Due to manufacturing tolerances, there may be slight variations in the dis
placement.
2) maximum 20 second per minute and not more than 10% of the duty cycle
3) theoretical value at the max. permitted continuous pressure for mineral oil
4) theoretical value at the max. permitted continuous pressures for mineral
oil at n = 1450 rpm
at speed
1450 min
p = 0 bar
[l/min]
7,4
9,1
11,5
14,5
18,3
22,6
29,5
36,4
46,8
56,9
73,2
92,1
116
146
181
236
291
361
Maximum
-1
speed
[rpm]
3600
3400
3200
2800
2500
2300
2000
1800
1750
1500
Code operating pressure at the pump
continuous
Mineral
QX23-005
QX23-006
320 280 400 350
QX23-008
QX33-010
QX33-012
320 280 400 350
QX33-016
QX43-020
QX43-025
320 280 400 350
QX43-032
QX53-040
QX53-050
320 280 400 350
QX53-063
7)
QX63-080
7)
7)
7)
7)
7)
QX63-100
QX63-125
QX83-160
QX83-200
QX83-250
320 280 400 350
320 280 400 350
Torque Input power
outlet side
intermittent
[bar]
Mineral
HFC
oil
5) for speeds > 1450 rpm, the min. permissible inlet pressure is 0.95 bar ab
solute. For HFC application asecond suction port may be required
6) max. speed only possible with second suction port, see section 2.2.1
7))for speeds > 1450 rpm, the min. permissible inlet pressure is 0.95 bar ab
solute.
[bar]
oil
2)
HFC [Nm]
26
32
41
51
64
80
104
128
165
200
258
321
409
514
636
830
1025
1270
3)
[kW]
4)
4,0
4,9
6,2
7,7
9,7
12,1
15,8
19,4
25,0
30,4
39,1
49,3
62,0
78,1
96,5
126,0
155,7
192,7
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Internal Gear Pump QX
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3 Performance graphs
The performance graphs shown are valid for the specified pump models.
For other pump sizes, contact Bucher Hydraulics.
3.1 Noise level (Lp)
Lp [dB(A)]
80
70
60
50
40
10 30 50 70 90
20 60
40
p [bar]
120
100
200
140
280
320
180
3.2 Efficiency (h)
measured at speed 1450 rpm, viscosity 42 mm2/s
3.2.1 Pressure range 1
Volumetric efficiency
η [%]
00
90
80
60
40
80
120
14010020
110
210
Pressure range
160 180
200
Q [l/min]
125
QX81
QX61
QX51
QX41
QX31
QX21
210
p [bar]
720
360
180
92
46
23
11,5
6,1
measured to DIN 45635, Part 26, in Stuttgart University's low-echo noise
measurement chamber;
measurement distance 1 m; speed n = 1500 rpm; viscosity = 42 mm
1
2
3
2
/s
Hydromechanical efficiency
η [%]
100
90
80
60
40 120 140 160 180
100
8020
200
QX81
QX61
QX51
QX41
QX31
QX21
210
p [bar]
Intermitted operating pressure as a function
of displacement (see chapter 2.2)
3.2.2 Pressure range 2
Volumetric efficiency
η [%]
100
90
80
70
0 20 100 140 200 240
40 60 80 120 160 180 220
Intermitted operating pressure
8/32
QX82
QX62
QX52
QX42
QX32
QX22
p [bar]
Hydromechanical efficiency
η [%]
100
90
80
70
40 60
20 80 120 160 220180140
0
100
QX82
QX62
QX52
QX42
QX32
QX22
200
240
p [bar]
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
3.2.3 Pressure range 3
1]
Volumetric efficiency
100
[%]
90
80
70
0 50 100 150 200 250 300 350 400
QX83
QX63
QX53
QX43
QX33
QX23
p [bar]
Intermitted operating pressure
3.3 Operation with varialble-speed drives
IMPORTANT: The following main characteristics are to be understood as examples only. They are
valid only for the specified pump models and parameters.
We would be very happy to advice you on the layout of your drive.
QX pumps with variable-speed drive are all contains external drain port.
Hydromechanical efficiency
η [%]
100
90
80
70
0
50
100
150 200 250 300
350
400
QX83
QX63
QX53
QX43
QX33
QX23
p [bar]
3.3.1 Typical loading cycle for a QX pump with
3.3.2 Minimum speed as a function of pressure
variable-speed drive
Pump QX53-063 with viscosity 20 mm2/s
-
n [min
600
0 20 40 60 80 100
]
p [bar
350
0 20 40 60 80 100
Q [l/min]
35
30
25
20
15
10
5
0
0 20 40 60 80 100
1
t [s]
t [s]
t [s]
Pump QX53-063 measured: with viscosity 42 mm2/s
p [bar], Inlet presure absolute
1,0
0,9
0,8
0,7
0,6
0,5
0,4
0 500 1000 1500 2000 2500 3000
Continuous operation
Operation prohibited
n [rpm]
3.3.3 Minimum pressure at suction port as a func
tion of Speed
Pump QX53-063 measured with viscosity 42 mm2/s
p [bar]
300
250
200
150
100
50
0
1 Pressure-holding operation
Intermittent operationcontact Bucher
Continuous operation
100 200 300 400
Q = 0 l/min for up to 60 s
500
n [rpm]
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Internal Gear Pump QX
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4 Single pumps
4.1 Dimensions
Frame size 2 3 4 5 6 8
Pressure range 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3 1 2 3
Suction port:
to SAE
1)
J518
S G1“
Pressure
port:
to SAE J518
Mounting:
oval 2-hole
flange to ISO
3019/1
(SAE)
ISO 3019/2
(metric)
P
1)
A 118 132 170 212 267 330
B (SAE) - 106 146 181 229 -
B (Metr.) 100 109 140 180 224 280
C 9 11 14 18 22 26
N (SAE) - 82,55 - 0,05 101,6 - 0,05 127 - 0,05 152,4 - 0,05 -
N (Metr.) 63 h8 80 h8 100 h8 125 h8 160 h8 200 h8
O 8,5 8,5 10,5 12,5 16,5 20
V 6 6 7 7 7 9
4-hole flange
ISO 3019/2
Shaft end:
parallel, to
ISO/R775
X (Metr.) 9 9 12 14 18 22
Y (Metr.) 85 103 125 160 200 250
D 20 j6 25 j6 32 j6 40 j6 50 j6 63 j6
2)
E 36 42 58 82 82 105
F 6 8 10 12 14 18
G 22,5 28 35 43 53,5 67
I 45 50 68 92 92 117
Housing
K 37,5 44 52,5 60,5 74 90
L 136 118 153 164 144 189 202 176 232 242 210 280 288 248 338 361 331 446
M - 55 90 - 69,5 114 - 87 143 - 102 172 - 119 209 - 151 266
T 85 107 133 177 214 220 220 273 275 275
Z 50 60 62,5 78 97,5 125
Weight kg 5 5 6,5 10 9,5 12,5 18 17 22 33 31 40 64 60 76 130 120 160
thread
G1/2”
thread
3)
3)
4)
G1 1/4”
thread
G3/4”
thread
3) 4)
3)
1 1/2” 2” 2 1/2” 3”
1” 1 1/4” 1 1/2” 2”
1) pipe flange dimensions, SAE J518 code 61 / ISO 6162-1
high pressure type up to 420 bar (see section 10.2)
low pressure type for up to 16 bar (see section 10.3)
2) for other shaft ends, contact Bucher Hydraulics
3) threaded port to DIN 3852, Part 2
4) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
4.2 Pressure range 1
K
I
E
L
1
S
C
2
X
N
G
D
V
(P)
S
O
P
3
1 external drain port - see special feature 06
2 Special model: 4-hole flange ISO 3019/2
4.3 Pressure range 2
L
IKM
E
S
P
F
P S
T
A
B
Z
Z
Y
3 Depending on operating conditions, a second
suction port may be required on QX61 (SAE 2”)
and QX81 (SAE 2 1/2”) - see section 2.2.1
1
C
2
X
F
P S
G
N
D
V
S
O
(P)
T
A
B
ZZ
1 external drain port - see special feature 06 2 Special model: 4-hole flange ISO 3019/2
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
Y
11/32
4.4 Pressure range 3
I
K
E
N
D
G
L
M
S
S P
P
1
C
F
T
A
P S
B
2
X
Y
V
O
Z
Z
1 external drain port - see special feature 06 2 Special model: 4-hole flange ISO 3019/2
4.5 Ordering code for single pumps
QX 040 * *R
Series = QX
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
Displacement in cm3/rev = 005 - 500
Rotation right (CW) = R (Standard)
(viewed from shaft end) left (CCW) = L
Option (see section 4.7 for a selection)
5 3
-
Ordering example:
Required: single pump
Displacement: 40 cm
3
/rev
Continuous pressure: 300 bar
for use with mineral oil
Ordering code: QX53-040R
4.6 Standard configuration
S direction of rotation - right (CW)
S 2-hole mounting flange to ISO 3019/1 (SAE):
sizes QX 3-6
S 2-hole mounting flange to ISO 3019/2 (metr.):
sizes QX 2+8
S Nitrile seals
S parallel shaft end to ISO/R775
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4.7 Options
06 = external drain port in the pump rear cover
QX 2-5 G1/4”
QX 6 G3/8”
QX 8 G1/2”
09 = Viton seals
12 = 2-hole mounting flange to ISO 3019/2 (metric):
size QX3-6
29 = for HFB and HFC fluids, frame sizes 2 to 5
66 = 4-hole mounting flange to ISO 3019/2 (metric)
83 = second suction port on:
QX61 = SAE 2”
QX81 = SAE 2 1/2”
86 = for HFB and HFC fluids, frame sizes 6 and 8
117 = pressure port to SAE J518 code 61 / ISO 6162-1
can be supplied for frame size 2 + 3 with pressure
ranges 2 + 3
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
5 Double pumps
QX double pumps consist of two single pumps mounted on
a common drive shaft. Hydraulically, the two pumps oper
ate independently of one another but they share a common
suction port in the pump's centre section. The larger pump
of the combination is situated at the shaft end (the drive
side) and is referred to as Pump I. With equal frame sizes,
the pump with the larger displacement is situated at the
drive side.
5.1 Selection table
5/6/8 10/12/16 20/25/32 40/50/63 80/100/125 160/200/250
QX22...
125
160
210
QX23...
250 400
QX21...
QX32...
E F D E F D E F D E
H I G H I G H I G H I
B C A B C A B C A B C A
/rev
3
Pump 1
Displacement in cm
315
250
QX22..
5/6/8
10/12/16
20/25/32
40/50/63
80/100/125
160/200/250
400
500
400
QX23..
125/160
125/160
125/160
125/160
Maximum intermittent pressure in bar
125/160
125/160
210
250
400
210
250
400
210
250
400
210
250
400
210
250
400
210
QX21..
QX32..
QX33..
QX31..
QX42..
QX43..
QX41..
QX52..
QX53..
QX51..
QX62..
QX63..
QX61..
QX82..
QX83..
QX81..
250 400
E
H I
B C A
E F D E
H I G H I
B C A B C A
E F D E F D E
H I G H I G H I
B C A B C A B C A
E F D E F D E F D E
H I G H I G H I G H I
B C A B C A B C A B C A
Double pumps can be combined as shown in the following
table. If a letter is shown at the intersection point of the two
pumps, the letter identifies the page in section 5.2 that con
tains the relevant dimensional drawing. If there is no letter
at the intersection point, then that pump combination is not
possible.
Pump 2
Displacement in cm3/rev
Maximum intermittent pressure in bar
125
160
210
QX33...
250 400
QX31...
E F D E F D E F D E
H I G H I G H I G H I
B C A B C A B C A B C A
QX42...
125
160
210
QX43...
250 400
QX41...
QX52...
125
160
210
QX53...
250 400
QX51...
QX62...
125
160
210
QX63...
250 400
QX61...
QX82...
315
400
500
125
160
210
QX83...
QX81...
Maximum permissibledrive
shaft torque (Nm)
65
130
260
520
1050
2100
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
13/32
5.2 Dimensions
A Double pumps QX.1/.1
L
1
Q1
M2
M1
I
2
K
L1
P1 P2
S
1 S = common suction port
2 shaft and mounting dimensions see section 4
Q2
ZZ
3
3 depending on operating conditions, a second
suction port may be required - see section
2.2.1, QX61 SAE 2”, QX81 SAE 2 1/2”
Typ L L1 K M1 M2 Q1 Q2 I Z S P1 P2
QX21/21 296 251 141 18 18
QX31/21 343 293
QX31/31 358 308 26 G 3/4”
171 26
QX41/21 396 328
QX41/31 411 343 33 15 G 3/4”
201 19
30
- -
35
15 68 63 SAE 2” SAE 1”
45 50 G 1 1/4”
50 60 G 1 1/2”
1)
1)
G 1/2”
G 3/4”
1) 2)
1) 2)
G 1/2”
G 1/2”
1) 2)
1) 2)
1) 2)
1) 2)
QX41/41 449 381 208 26 26 23 23 1” SAE
QX51/21 468 376
QX51/31 483 391 39 15 G 3/4”
241 23
QX51/41 521 429
QX51/51 547 455 30 28 SAE 1 1/4”
249 30
QX61/31 541 449
QX61/41 564 472 27 39 26 27 SAE 1”
287
QX61/51 601 509
QX61/61 628 536 32 35 SAE 1 1/2”
292 32
QX81/41 679 562
QX81/51 705 588 47 30 SAE 1 1/4”
QX81/61 732 615
359
QX81/81 774 657 38 40 SAE 2”
43
15
32
23
28
24 47 17 14
40
28
35
51
35
45
38
25
25
35
40
SAE 2 1/2”
92 78
SAE 3”
92 98 SAE 1 1/2”
SAE 3 1/2”
117 125 SAE 2”
SAE 4”
SAE 1 1/4”
SAE 1 1/4”
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1”
SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
14/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
B Double pumps QX.1/.2
L
Q1
M1
M2
I
2
K
L1
P1
S
P2
H
1
ZZ
3
1 S = common suction port
2 shaft and mounting dimensions see section 4
3 depending on operating conditions, a second
suction port may be required - see section
2.2.1, QX61 SAE 2”, QX81 SAE 2 1/2”
Typ L L1 K M1 M2 Q1 I Z H S P1 P2
QX21/22 278 233 141
QX31/22 325 275
QX31/32 338 288 87 60 G 3/4”
171
QX41/22 378 310
QX41/32 391 323 92 60 G 3/4”
201
QX41/42 423 355 208
QX51/22 450 358
QX51/32 463 371 100 60 G 3/4”
241
QX51/42 495 403
QX51/52 515 423 127 78 SAE 1 1/4”
249
QX61/32 521 429
QX61/42 538 446
287
QX61/52 569 477
QX61/62 588 496 149 98 SAE 1 1/2”
292
QX81/42 653 536
QX81/52 673 556 150 78 SAE 1 1/4”
QX81/62 692 575
359
QX81/82 724 607 179 125 SAE 2”
18
26
19
67
79
84
15
-
45 50
50
50 60
50
G 1 1/4” 1)G 1/2”
G 1 1/2” 1)G 3/4”
SAE 2” SAE 1”
68 63
111 23 63 SAE 1”
26
92
23
118
30
112 17
24
123 26 63 SAE 1”
27
137
32
141
35
162
38
15
28
35
25
40
92 78
92 98
117 125
50
63
60
78
63
98
SAE 2 1/2”
SAE 3”
SAE 3 1/2”
SAE 4”
1) 2)
1) 2)
SAE 1 1/4”
SAE 1 1/2”
SAE 2”
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
15/32
C Double pumps QX.1/.3
L
Q1
M1
I
2
K
L1
P1
S
M2
P2
1
ZZ
3
H
1 S = common suction port
2 shaft and mounting dimensions see section 4
3 depending on operating conditions, a second
suction port may be required - see section
2.2.1, QX61 SAE 2”, QX81 SAE 2 1/2”
Typ L L1 K M1 M2 Q1 I Z H S P1 P2
QX21/23 313 268 141 18 102
QX31/23 360 310
QX31/33 383 333 132 60 G 3/4”
171 26
QX41/23 413 345
QX41/33 436 368 137 60 G 3/4”
201 19
114
119
45 50
-
G 1 1/4” 1)G 1/2”
50
50 60 G 1 1/2” 1)G 3/4”
50
15 68 63
SAE 2” SAE 1”
1) 2)
1) 2)
G 1/2”
G 1/2”
1) 2)
1) 2)
1) 2)
1) 2)
QX41/43 479 411 208 26 167 23 63 SAE 1”
QX51/23 485 393
QX51/33 508 416 145 60 G 3/4”
241 23
QX51/43 551 459
QX51/53 585 493 197 78 SAE 1 1/4”
249 30
QX61/33 566 474
QX61/43 594 502 27 179 26 63 SAE 1”
287
QX61/53 637 545
QX61/63 678 586 239 98 SAE 1 1/2”
292 32
QX81/43 709 592
QX81/53 743 626 220 78 SAE 1 1/4”
QX81/63 782 665
359
QX81/83 839 722 294 125 SAE 2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
127
15
174
28
24 157 17
207
35
197
35
25
252
38
40
92 78
92 98
117 125
50
63
60
78
63
98
SAE 2 1/2”
SAE 1 1/4”
SAE 3”
SAE 1 1/2”
SAE 3 1/2”
SAE 2”
SAE 4”
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
SAE 1 1/2”
16/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
D Double pumps QX.2/.1
L
Q2
M1
I
2
K
P1
M2
L1
P2
S
1
ZZ
3
1 S = common suction port
2 shaft and mounting dimensions see section 4
3 depending on operating conditions, a second
suction port may be required - see section
2.2.1, QX61 SAE 2”
Typ L L1 K M1 M2 Q2 I Z S P1 P2
QX32/21 323 273
QX42/21 370 302
QX42/31 385 317 33 15 G 3/4”
QX52/21 436 344
QX52/31 451 359 39 15 G 3/4”
QX52/41 489 397
QX62/31 501 409
QX62/41 524 432 39 27 SAE 1”
QX62/51 561 469
151 87
175 103
209 120
217 127
247 144
252 149
QX82/41 629 512
QX82/51 655 538 47 30 SAE 1 1/4”
309 179
QX82/61 682 565 45 35 SAE 4” SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
30
35
43 -
32 23
47 14
40 28
51 25
50 60 G 1 1/2”
-
68 63 SAE 2” SAE 1”
92 78 SAE 2 1/2” SAE 1 1/4”
92 98
117
125
SAE 3 1/2”
1)
SAE 3”
1) 2)
G 3/4”
SAE 1 1/2”
SAE 2”
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
17/32
E Double pumps QX.2/.2
L
M1
I
2
K
L1
P1
M2
P2
H
S
1
ZZ
1 S = common suction port 2 Shaft and mounting dimensions - see section 4
Typ L L1 K M1 M2 I Z H S P1 P2
QX22/22 260 215 123 67 67 45 50
QX32/22 305 255
QX32/32 318 268 87 60 G 3/4”
151 87
QX42/22 352 284
QX42/32 365 297 92 60 G 3/4”
175 103
79
50 60 G 1 1/2”
84
68 63
50
50
G 1 1/4”
1)
1)
SAE 2” SAE 1”
G 1/2”
G 3/4”
1) 2)
1) 2)
G 1/2”
G 1/2”
1) 2)
1) 2)
1) 2)
1) 2)
QX42/42 397 329 182 111 111 63 SAE 1”
QX52/22 418 326
QX52/32 431 339 100 60 G 3/4”
209 120
QX52/42 463 371
QX52/52 483 391 127 78 SAE 1 1/4”
217 127
QX62/32 481 389
QX62/42 498 406 123 63 SAE 1”
247
144
QX62/52 529 437
QX62/62 548 456 149 98 SAE 1 1/2”
252 149
QX82/42 603 486
QX82/52 623 506 150 78 SAE 1 1/4”
QX82/62 642 525 162 98
309 179
QX82/82 674 557 179 125 SAE 2”
92
118 63
112
137 78
92 78
92 98
141
117 125
50
SAE 2 1/2”
SAE 1 1/4”
60
SAE 3”
SAE 1 1/2”
63
SAE 3 1/2”
SAE 4”
SAE 2”
SAE 1 1/2”
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
18/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
F Double pumps QX.2/.3
L
M1
I
2
K
L1
P1
S
M2
P2
1
ZZ
H
1 S = common suction port 2 Shaft and mounting dimensions - see section 4
Typ L L1 K M1 M2 I Z H S P1 P2
QX32/23 340 290 151 87 114 50 60
QX42/23 387 319
QX42/33 410 342 137 60 G 3/4”
QX52/23 453 361
QX52/33 476 384 145 60 G 3/4”
175
209
103
120
119
68 63 SAE 2” SAE 1”
127
92 78
50
50
G 1 1/2”
SAE 2 1/2” SAE 1 1/4”
1)
QX52/43 519 427 217 127 174 63
QX62/33 526 434
QX62/43 554 462 179 63 SAE 1”
247
144
157
60
92 98
SAE 3”
QX62/53 599 507 252 149 207 78
QX82/43 659 542
309
QX82/53 693 576 220 78 SAE 1 1/4”
QX82/63 732 615 252 98 SAE 4” SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
179
197
117
125
63
SAE 3 1/2”
1) 2)
G 3/4”
SAE 1 1/2”
SAE 2”
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
19/32
G Double pumps QX.3/.1
L
Q2
M1
I
2
K
L1
P1
M2
P2
S
1
ZZ
3
1 S = common suction port
2 Shaft and mounting dimensions - see section 4
3 depending on operating conditions, a second
suction port may be required - see section 2.2.1
QX61 SAE 2”
Typ L L1 K M1 M2 Q2 I Z S P1 P2
QX33/21 368 318 196 132 30
QX43/21 426 358
QX43/31 441 373 33 15 G 3/4”
QX53/21 506 414
QX53/31 521 429 39 15 G 3/4”
231
279
159
190
35
43 -
-
50 60 G 1 1/2”
68 63 SAE 2” SAE 1”
92 78 SAE 2 1/2” SAE 1 1/4”
1)
QX53/41 559 467 287 197 32 23
QX63/31 591 499
QX63/41 614 522 39 27 SAE 1”
337 234
47 14
92 98
SAE 3”
QX63/51 651 559 342 239 40 28
QX83/41 744 627
QX83/51 770 653 47 30 SAE 1 1/4”
424
294
QX83/61 797 680 45 35 SAE 4” SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
51 25
117
125
SAE 3 1/2”
1) 2)
G 3/4”
SAE 1 1/2”
SAE 2”
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
20/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
H Double pumps QX.3/.2
L
M1
IK
L1
2
P1
1
M2
ZZ
P2
H
S
1 S = common suction port 2 Shaft and mounting dimensions - see section 4
Typ L L1 K M1 M2 I Z H S P1 P2
QX23/22 295 250 158 102 67 45 50
QX33/22 350 300
QX33/32 363 313 87 60 G 3/4”
196 132
QX43/22 408 340
QX43/32 421 353 92 60 G 3/4”
231 159
79
50 60 G 1 1/2”
84
68 63
50
50
G 1 1/4”
QX43/42 453 385 238 167 111 63 SAE 1”
QX53/22 488 396
QX53/32 500 408 100 60 G 3/4”
279 190
QX53/42 533 441
QX53/52 553 461 127 78 SAE 1 1/4”
287 197
QX63/32 571 479
QX63/42 588 496 123 63 SAE 1”
337 234
QX63/52 619 527
QX63/62 638 546 149 98 SAE 1 1/2”
342 239
QX83/42 718 601
QX83/52 738 621 150 78 SAE 1 1/4”
QX83/62 757 640 162 98
424 294
92
92 78
118 63
112
92 98
137 78
141
50
60
63
117 125
SAE 2 1/2”
SAE 3”
SAE 3 1/2”
QX83/82 789 672 179 125 SAE 2”
1)
1)
SAE 2”
SAE 4”
1) 2)
G 1/2”
G 3/4” 1)
SAE 1”
SAE 1 1/4”
SAE 1 1/2”
SAE 2”
2)
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1) 2)
SAE 1”
1)
G 3/4”
SAE 1 1/4”
SAE 1”
SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2 and 3
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
21/32
I Double pumps QX.3/.3
L
M1
I
2
K
L1
P1
M2
P2
S
1
ZZ
H
1 S = common suction port 2 Shaft and mounting dimensions - see section 4
Typ L L1 K M1 M2 I Z H S P1 P2
QX23/23 330 285 158 102 102 45 50
QX33/23 385 335
QX33/33 408 358 132 60 G 3/4”
196 132
QX43/23 442 374
QX43/33 466 398 137 60 G 3/4”
231 159
114
50 60 G 1 1/2”
119
68 63
50
50
G 1 1/4”
QX43/43 509 441 238 167 167 63 SAE 1”
QX53/23 523 431
QX53/33 546 454 145 60 G 3/4”
279 190
QX53/43 589 497
QX53/53 623 531 197 78 SAE 1 1/4”
287 197
QX63/33 616 524
QX63/43 644 552 179 63 SAE 1”
337 234
QX63/53 689 597
QX63/63 728 636 239 98 SAE 1 1/2”
342 239
QX83/43 774 657
QX83/53 808 691 220 78 SAE 1 1/4”
QX83/63 847 730 252 98
424 294
127
92 78
174 63
157
98
92
207 78
197
50
60
63
117 125
SAE 2 1/2”
SAE 3 1/2”
QX83/83 904 787 294 125 SAE 2”
1) 2)
1) 2)
SAE 2”
SAE 3”
SAE 4”
1) 2)
G 1/2”
1) 2)
G 3/4”
SAE 1”
SAE 1 1/4”
SAE 1 1/2”
SAE 2”
1) 2)
G 1/2”
1) 2)
1) 2)
G 1/2”
1)
1) 2)
G 1/2”
1) 2)
SAE 1”
1) 2)
G 3/4”
SAE 1 1/4”
SAE 1”
SAE 1 1/2”
1) threaded port to DIN 3852, Part 2
2) pressure port to SAE J518 code 61 / ISO 6162-1 can be supplied for pressure ranges 2+3
22/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
5.3 Ordering code for double pumps
QX 6 3 R02
Series = QX
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
Displacement in cm3/rev = 005 - 500
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
Displacement in cm
Rotation (viewed from shaft end) right (CW) = R (Standard)
Option (see section 4.7 for a selection)
3
/rev = 005 - 500
left (CCW)= L
-
08
-
3 1
0
/
0
**
Ordering example:
Required: double pump
Pump 1
Displacement: 80 cm
Continuous pressure: 300 bar
Type: 63-080
Pump 2
Displacement: 20 cm
Continuous pressure: 160 bar
Type: 31-020
for use with mineral oil
Ordering code: QX63-080/31-020R
3
3
/rev
/rev
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
23/32
6 Triple pumps
The following table shows the triple-pump combinations
that can be supplied. Other triple-pump combinations can
be assembled after consultation with the factory. The indi
vidual pumps 1, 2 and 3 must be specified in accordance
with the main characteristics shown in section 2.
The largest pump of the combination is situated at the shaft
end and is referred to as Pump 1. For equal frame sizes, the
pump with the larger displacement is situated at the drive
side. Pumps 2 and 3 have a common suction port.
6.1 Selection table
Frame size of Pump 1
QX2. QX3. QX4. QX5. QX5. QX6. QX8.
QX21/21/21 QX31/21/21 QX41/21/21 QX51/22/23 QX52/52/31 QX61/31/33 QX81/42/23
QX21/21/22 QX31/21/22 QX41/21/23 QX51/23/23 QX52/52/42 QX61/41/21 QX82/42/43
QX21/21/23 QX31/21/23 QX41/22/22 QX52/23/23 QX52/52/43 QX61/41/42 QX82/51/53
QX21/22/22 QX31/22/22 QX41/23/23 QX53/22/22 QX52/52/52 QX61/42/23 QX83/51/53
QX21/22/23 QX31/22/23 QX42/22/22 QX51/31/33 QX52/52/53 QX61/42/43 QX81/61/61
QX21/23/23 QX31/23/22 QX43/22/22 QX51/33/33 QX52/53/31 QX61/43/43 QX81/62/63
QX22/22/22 QX31/23/23 QX43/23/22 QX51/41/23 QX52/53/53 QX62/41/22 QX81/63/33
QX22/22/23 QX32/22/22 QX43/23/23 QX51/41/42 QX53/53/23 QX62/42/42 QX82/61/61
QX23/23/23 QX32/22/23 QX41/31/33 QX51/41/43 QX53/53/33 QX62/43/43 QX82/62/62
QX32/23/23 QX41/33/22 QX51/42/22 QX63/43/22 QX82/63/31
QX33/21/22 QX41/33/33 QX51/42/43 QX61/52/53 QX83/61/61
QX33/21/23 QX42/31/32 QX51/43/21 QX61/53/23 QX83/63/43
QX33/23/23 QX42/32/32 QX51/43/22 QX61/53/31 QX83/63/61
QX31/31/21 QX42/33/32 QX51/43/23 QX62/52/32 QX81/81/61
QX31/31/22 QX43/31/31 QX51/43/43 QX62/52/52 QX81/81/81
QX31/31/23 QX43/33/33 QX52/42/23 QX62/53/22 QX82/82/52
QX31/31/31 QX41/41/33 QX52/42/42 QX62/53/23 QX82/82/62
QX31/31/33 QX41/42/21 QX52/43/22 QX62/53/31 QX82/82/63
QX31/32/22 QX41/42/23 QX52/43/23 QX62/53/33 QX83/83/53
QX31/33/33 QX41/42/42 QX52/43/43 QX63/51/51
QX32/32/22 QX41/43/21 QX53/41/22 QX63/53/53
QX32/32/23 QX41/43/22 QX53/41/23 QX61/61/31
QX32/32/32 QX41/43/23 QX53/42/22 QX61/61/33
QX32/32/33 QX42/42/22 QX53/42/43 QX61/61/41
QX33/33/23 QX42/42/23 QX53/43/23 QX61/61/53
QX33/33/33 QX42/42/31 QX51/51/21* QX61/62/42
QX42/42/32 QX51/51/32 QX61/62/63
QX42/42/33 QX51/51/33 QX61/63/32
QX42/42/42 QX51/52/32 QX61/63/33
QX42/42/43 QX51/52/33 QX61/63/41
QX43/43/43 QX51/52/42 QX61/63/42
QX51/52/43 QX62/62/33
QX51/53/22 QX62/62/43
QX51/53/23 QX62/62/53
QX51/53/31 QX62/62/62
QX51/53/33 QX62/62/63
QX51/53/41 QX62/63/63
QX51/53/43 QX63/63/32
QX51/53/52 QX63/63/43
QX52/52/23 QX63/63/53
65 130 260 520 520 1050 2100
Maximum permissible drive shaft torque in Nm
* this pump is used as the ordering example in section 6.2
24/32
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
6.2 Ordering code for triple pumps
Triple pumps can only be supplied after consultation with the factory.
QX
Series = QX
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
3
Displacement in cm
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
Displacement in cm
Rotation (viewed from shaft end) right (CW) = R (Standard)
Option (see section 4.7 for a selection)
/rev = 005 - 500
3
/rev = 005 - 500
Frame size = 2 / 3 / 4 / 5 / 6 / 8
Pressure range = 1 / 2 / 3
Displacement in cm
-
5 1 R01
3
left (CCW) = L
12
/rev = 005 - 500
/
5
5 1
-
08
-
2 1
0
/
2
**
Ordering example:
Required: triple pump
Pump 1
Displacement: 125 cm
Continuous pressure: 80 bar
Type: 51-125
Pump 2
Displacement: 80 cm
Continuous pressure: 150 bar
Type: 51-080
3
3
/rev
/rev
Pump 3
Displacement: 12 cm
Continuous pressure: 125 bar
Type: 21-012
For use with mineral oil
Referring to the selection table in sect. 6.1, QX51/51/21 is
an obtainable combination.
Ordering code: QX51-125/51-080/21-012R
3
/rev
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Internal Gear Pump QX
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7 Low-flow capability pumps
7.1 Generals
The QX24 internal gear pump is a further development of
the Bucher internal gear pump. With displacements from
3,3 to 8 cm3/rev, it extends the low-flow capability of the QX
range.
7.2 Technical date
Mounting attitude unrestricted
Mounting method (standard) oval 2-hole flange to ISO 3019/2 (metric)
Direction of rotation right, alternatively left (but not reversible)
Pump drive method in-line, by flexible coupling
Fluids HLP mineral oils to DIN 51524, Part 2
HFC fluids to VDMA 24317
other fluids - consult Bucher Hydraulics
Minimum fluid cleanliness NAS 1638, class 9 or ISO 4406, code 20/18/15
Operating viscosity
Starting viscosity
Fluid temperature HLP mineral oils 80 _C max. / -20 °C min. (Considering viscosity field)
Minimum inlet pressure
Maximum pressure at drain port
External drain port is always provided
20 - 100 mm2/s
20 - 300 mm
2
/s (higher values, contact Bucher Hydraulics)
HFC 50 _C max.
0.85 bar absolute
1.5 bar absolute
7.3 Main characteristics
Effective
displacement
effectif Cont./Max. interm. pressure
cm3/rev l/min rpm bar bar Nm KW
3,3
4,2
5,1
6,3
8,0
1) at speed n = 1450 rpm (theoretical)
2) maximum intermittent pressure for max. 20 sec. but not more than 10% of the duty cycle
3) theoretical value at the max. permitted continuous pressure for mineral oil
4) theoretical value at the max. permitted continuous pressure for mineral oil at n = 1450 rpm
Flow rate 1) Maxi
mum
speed
4,8
6,2
7,4
9,1
11,5
3600
3600
3600
3600
3600
Type Mineral oil to
DIN 51524
QX24-003
QX24-004
QX24-005
QX24-006
QX24-008
320/400
320/400
360/400
360/400
360/400
HFC to
VDMA 24317
2)
280/350
280/350
320/350
320/350
320/350
Torque
3)
17
21,5
30
36
46
The main characteristics are valid for hydraulic oils as well as fire-resistant and environmentally-friendly
fluids with a viscosity of 20 to 50 mm
2
/s
Power
requirement
4)
2,6
3,2
4,5
5,5
7,0
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
7.4 Volumetric efficiency (h)
measured at speed 1450 rpm; viscosity 42 mm2/s
η [%]
100
90
QX24-008
80
7.5 Single pumps
7.5.1 Dimensions
45
36
øj620
øh863
1 external drain port G1/4”
37.5
G 1”
6
8.5
L
179,5
191,5
QX24-003
400
p [bar]
M
113
125
70
0 50 100 150 200 250 300 350
L
M
S
P
G 1/2”
1
22.5
P
86
118
50 50
ø
6
9
S
100
3,3 & 4,2 cm³/U
4,2 - 8 cm³/U
7.5.2 Ordering codes
Series = QX
Size = 2
Pressure range = 4
Displacement in cm
3
/rev = 003, 004, 005, 006 and 008
Direction of rotation (viewed from shaft end) right (CW) = R
left (CCW) = L
External drain port = 06
Option contact Bucher Hydraulics
7.5.3 Standard configuration
S direction of rotation “right ”
S 2- hole mounting flange to ISO 3019/2 (metric)
S Nitrile seals
S cylindrical shaft end to ISO R775
S separate drain port G 1/4 in rear cover of the pump
QX 004 R
2 4 06
-
--
**
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Internal Gear Pump QX
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7.6 QX24 pumps combined with other QX-singel pumps
7.6.1 Dimensions
2
1 external drain port G 1/4”
2 dimensions see section 4
7.6.2 Ordering code
Series
Site = 2 / 3 / 4 / 5
Pressure range = 1 and 2
8.5
A
6
∅63 h8
37.5
G 1”
179,5
113
G 1/2”
1
86
118
50
P
3 dimension A depends on the driving QX pump
model (2)
-
QX 4 1 R00
04
2 4
0
//
3
A
QX21-...
QX22-...
QX31-...
100
QX32-...
QX41-...
QX42-...
QX52-... 26
50
S
-
4
06
33,5
26,5
35
26
35
28
ME*
Displacement in cm
Pump 1
3
/U = 005 bis 500
Size = 2
Pressure range = 4
3
Pump 2
Displacement in cm
/U = 003 - 008
Direction of rotation right (CW) = R (Standard)
(viewed from shaft end) left (CCW) = L
External drain line standard
Option contact Bucher Hydraulics
Ordering example:
Requird: Double pump
Pump 1
Displacement: 40 cm
3
/rev
Continuous pressure: 160 bar
Type: 41 - 040
Pump 2
Displacement: 4 cm3/rev
Continuous pressure: 250 bar
Type: 24 - 004
For use with mineral oil:
Ordering code: QX41-040//24-004R 06-ME
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100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
8 Fluid cleanliness
10 Operational reliability
QX pumps require fluid with a minimum cleanliness level of
NAS 1638, Class 9 or ISO 4406, code 20/18/15.
HLP hydraulic oils to DIN 51524, Part 2, can be used without
any special restriction as long as they remain within the spe
cified temperature and viscosity ranges. HFC fire-resistant
fluids to DIN 51502 can be used. Note that all fire-resistant
fluids require special versions of the pumps or motors and
must be approved by Bucher Hydraulics. We recommend
the use of fluids that contain anti-wear additives for mixedfriction operating conditions. Fluids without appropriate ad
ditives can reduce the service life of pumps and motors. The
user is responsible for maintaining, and regularly checking,
the fluid quality. Bucher Hydraulics recommends a load ca
pacity of >
30 N/mm
2
to Brugger DIN 51347-2.
9 Fluid cleanliness
Cleanliness class (RK) onto ISO 4406 and NAS 1638
Code
ISO 4406
23/21/18 8000000 2000000 250000 12
22/20/18 4000000 1000000 250000 22/20/17 4000000 1000000 130000 11
22/20/16 4000000 1000000 64000 21/19/16 2000000 500000 64000 10
20/18/15 1000000 250000 32000 9
19/17/14 500000 1300000 16000 8
18/16/13 250000 64000 8000 7
17/15/12 130000 32000 4000 6
16/14/12 64000 16000 4000 16/14/11 64000 16000 2000 5
15/13/10 32000 8000 1000 4
14/12/9 16000 4000 500 3
13/11/8 8000 2000 250 2
Number of particles / 100 ml
4 µm 6 µm 14 µm
NAS 1638
To guarantee the reliable operation and a long service life
of the pump, a maintenance schedule must be prepared for
the power unit, machine or system. The maintenance
schedule must make sure that the provided or permissible
operating conditions of the pump are adhered to over the
period of use.
In particular, compliance with the following operating para
meters must be ensured:
– The required oil cleanliness
– The operating temperature range
– The fluid level
Moreover, the pump and the system must be inspected at
regular intervals for changes in the following parameters:
– Vibration
– Noise
– Differential temperature of pump – fluid in the tank
– Foaming in the tank
– Freedom from leakage
Changes in these parameters indicate wear of components
(e.g. drive motor, coupling, pump, etc.). The cause must be
immediately pinpointed and eliminated.
To provide high operational reliability of the pump in the ma
chine or system, we recommend continuous, automatic
checks of the above parameters and an automatic shut
down in the case of changes that exceed the usual fluctu
ations within the provided operating range.
11 Note
This catalogue is intended for users with specialist knowl
edge. The user must check the suitability of the equipment
described herein in order to ensure that all of the conditions
necessary for the safety and proper functioning of the sys
tem are fulfilled. If you have any doubts or questions con
cerning the use of these pumps, please consult Bucher Hy
draulics.
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Internal Gear Pump QX
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12 Accessories
12.1 Bolt-on valves - SAE J518 code 61 / ISO 6162-1 pattern
Pressure relief valve Pressure relief valve
solenoid control
P
S
A DA
G
S
A DF / ASDH
G
P
M
T
M
Z
Technical data sheet
100-P-000123-
Technical data sheet
100-P-000119-
Accomulator charging valve
AGSF
T
P
T
Z
M
Z
Technical data sheet
100-P-0000124-
12.1.1Examples for Bolt-on valves, mounted on QX Internal Gear Pumps
Bolt-on valve with threaded ports
AGDF
1) Pipe flange see chapter 12.2
2) Please ask BUCHER HYDRAULICS for check valves
IMPORTANT: For detailed informations on Bolt-on valves see www.bucherhydraulics.com
Bolt-on valves with pipe flanges SAE
ASDF+RF
1)
Bolt-on valve with pipe flanges SAE
+ RVSAE
2)
ASDF+RF+RVSAE+DPSAE+ZPSAE
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Internal Gear Pump QX
12.2 Pipe flanges - high pressure type
Threaded pipe flanges are spot-faced for DIN 2353 pipe fitings
Material: ST37 / For Viton seals, contact Bucher Hydraulics
- Max. operating pressure 420 bar
- Flange size SAE J518 code 61 / ISO 6162-1
Ordering
number
Ordering
code
Size D∅ E F H L R X Y Viton seal
90 Shore
'A'
Retaining screws
DIN912-12.9 /
Nm
037000 RF 01-R08 G 1/2” 12,5 16 27 13 54 23 17,5 38 20,24x2,62 M8x30 30
037010 RF 02-R10 G 3/4” 20 18 30 12 65 26 22,2 47,6 26,65x2,62 M10x30 60
037020 RF 03-R11 G 1” 25 20 34 13 70 29 26,2 52,4 32,99x2,62 M10x35 60
037030 RF 04-R12 G 1 1/4” 32 22 38 14 80 36 30,2 58,6 40,86x3,53 M10x40 60
037040 RF 05-R13 G 1 1/2” 38 24 41 19 94 41 35,7 70 44,04x3,53 M12x45 120
037050 RF 06-R14 G 2” 50 26 45 20 102 48 42,9 77,8 59,92x3,53 M12x50 120
055470* RF 07-R16 G 2 1/2” * 63 30 50 18 114 57 50,8 89 72,62x3,53 M12x45 120
* at RF07 only to 210 bar be allowed
12.3 Low pressure type
- Max. operating pressure 16 bar
- Flange size SAE J518 code 61 / ISO 6162-1
Material: HST37 / For Viton seals, contact Bucher Hydraulics
Ordering
number
Ordering
code
SAE
flange
Size
D K F H L R X Y Viton seal
90 Shore 'A'
Retaining screws
DIN 912-8.8
Torque Nm
pipe
O/dia.
062450 RN 07-S 2 1/2” 63 75 35 14 120 57 51 89 69,44x3,53 M12 x 30 70 75
063880 RN 08-S 3” 76 88 140,5 68 62 106,5 85,32x3,53 M16 x 40 180 88
063890 RN 09-S 3 1/2” 89 100 40 19 158,5 73 70 120,3 98,02x3,53 M16 x 40 180 100
063900 RN 10-S 4” 103 115 168 79 78 130 110,72x3,53 M16 x 40 180 115
1) We recommend the use of seamless precision steel tube to DIN 2391 with-wallthick. max 6 mm
100-P-000021-E-10/ 11.2011
Internal Gear Pump QX
1)
ap
prox.
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www.bucherhydraulics.cominfo.kl@bucherhydraulics.com
E 2011 by Bucher Hydraulics GmbH, D-79771 Klettgau
All rights reserved.
Data is provided for the purpose of product description only, and must not be construed as warranted characteristics in the legal sense. The
information does not relieve users from the duty of conducting their own evaluations and tests. Because the products are subject to continual
improvement, we reserve the right to amend the product specifications contained in this catalogue.
Classification: 420.245. 000
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Internal Gear Pump QX
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