Hydraulic Motor OMP BMP Geroler Type

Hydraulic motors are widely used in a variety of industrial applications for torque and rotational speed generation. These motors, however, are susceptible to failure and breakdown, resulting in downtime and production loss. In this article, we will discuss the common causes of hydraulic motor failure and possible solutions.

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Product Introduction

Hydraulic Motor OMP BMP Geroler Type

Hydraulic motors play a critical role in numerous industrial systems by generating torque and rotational motion. Despite their utility, these components are prone to malfunctions that can disrupt productivity and lead to operational downtime. This article outlines typical reasons for hydraulic motor failures and suggests practical remedies.

Causes of Hydraulic Motor Failure

1. Contamination Issues
The presence of foreign particles such as dust, dirt, or moisture in the hydraulic system can accelerate wear and result in motor breakdown. Contamination often arises from inadequate maintenance of fluid levels and filter systems, leading to the use of degraded lubricants that promote corrosion and internal damage.
Remedy: Consistently monitor fluid quality and levels. Use high-efficiency filters and replace them as recommended to keep the hydraulic system free from impurities.

2. Overheating
Hydraulic motors frequently operate under high pressure and flow, generating considerable heat. Overheating-often caused by extended operation, elevated ambient temperatures, or inadequate cooling-can result in motor failure.
Remedy: Implement continuous temperature monitoring and consider adding auxiliary cooling mechanisms such as air or water cooling systems when needed.

3. Improper Fluid Viscosity
Hydraulic fluid viscosity directly influences motor performance, including speed and torque output. Fluids with viscosity that is too low reduce efficiency, while overly viscous fluids strain the motor and pump, potentially causing failure.
Remedy: Always use fluids that meet manufacturer specifications and replace them at scheduled intervals. Seek expert advice to identify the ideal fluid type and viscosity for your system.

4. Mechanical Wear
Components such as bearings, seals, and valves are subject to degradation over time due to incorrect installation, operational stress, or natural wear.
Remedy: Establish a routine preventive maintenance schedule. Inspect and replace worn or damaged parts promptly to maintain motor integrity and performance.

Conclusion

Hydraulic motors are indispensable in industrial settings, and their failure can incur substantial costs and safety risks. Recognizing common failure causes and adhering to a structured maintenance plan can markedly extend motor life and enhance reliability. By implementing these recommended practices, you can support sustained motor performance and minimize interruptions in operation.

ZMP Series

Structural Characteristics

◎ Axial distribution layout with column-type stator and rotor offering high mechanical efficiency;
◎ Specially engineered dynamic seal with strong back pressure resistance;
◎ Versatile mounting options including flanges, output shafts, and port arrangements;
◎ Compact and lightweight design with small installation footprint;
◎ Applicable in plastics machinery, machine tools, and other industrial domains.

Main Specification

Displacement, cc/r		50	63	80	100	125	160	200	250	305	400
Flow, LPM	Cont.	38	45	57	57	57	57	57	57	57	57
Flow, LPM	Int.	45	53	68	68	68	68	68	68	68	68
Speed, RPM	Cont.	698	663	679	558	452	354	284	235	203	156
Speed, RPM	Int.	859	774	811	669	544	425	339	281	242	180
Pressure, Bar	Cont.	124	124	124	124	124	115	110	100	100	90
Pressure, Bar	Int.	138	138	138	138	138	124	124	124	124	100
Torque, Nm	Cont.	73	86	124	154	194	228	285	304	412	481
Torque, Nm	Int.	84	93	139	173	216	261	319	378	483	525
Max. allowable back pressure		10MPa

Allowable Lateral Load (At Rated Speed)

◎ Intermittent operating pressure indicates the maximum pressure permitted at the inlet, while continuous operating pressure is the differential between inlet and return ports;
◎ Avoid concurrent operation at maximum speed and maximum pressure;
◎ Intermittent duty should not exceed 10% of each minute;
◎ Recommended fluid: anti-wear hydraulic oil with viscosity 37–73 cSt and cleanliness ISO 18/13;
◎ Maximum fluid temperature is 80°C;
◎ Equipped with advanced seals, the motor can handle back pressure up to 10 MPa, though for extended service life and overall performance, it is advised to keep back pressure under 5 MPa. If exceeded, connect an external drain line while ensuring the motor remains oil-filled. The drain should be throttled to maintain over 3.5 Bar back pressure. This setup also aids in contaminant removal and provides cooling;
◎ A run-in period is essential before full-load operation: operate for 1 hour at 30% of maximum pressure.

ZMP Series Motor Performance Data at Different Operating Points

Cont. Int.

50 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110	124	138
Flow, LPM	7.6	18	28	38	45	54	62
	7.6	125	110	96	86	76	65
	15.1	18	27	37	44	53	62	70	78	79
	15.1	260	250	238	231	215	206	196	188	229
	22.7	16	24	32	40	49	58	65	71	80
	22.7	414	406	395	385	375	368	356	345	370
	30.3	13	21	30	37	46	55	62	68	81
	30.3	550	540	528	515	502	485	480	672	518
	37.9	14	23	34	43	51	61	68	71	81
	37.9	698	698	693	690	689	684	681	672	672
	45.4		24	30	42	51	60	68	73	84
	45.4		859	856	853	851	847	844	837	832

63 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110	124	138
Flow, LPM	7.6	20	29	40	52	63	74
	7.6	110	108	108	105	104	103
	15.1	20	29	40	50	58	69	77	86	93
	15.1	220	214	212	210	206	202	200	198	198
	22.7	20	28	38	47	58	67	76	84	93
	22.7	332	330	326	324	320	316	314	310	305
	30.3	18	26	34	44	53	63	74	82	89
	30.3	443	440	436	434	432	430	428	426	425
	37.9	16	25	34	43	51	61	72	80	88
	37.9	554	550	548	546	542	540	538	534	530
	45.4		23	30	42	51	60	68	78	84
	45.4		663	660	658	654	650	648	645	643
	53			28	39	48	58	65	74	81
	53			774	770	768	764	760	754	750

80 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110	124	138
Flow, LPM	7.6	26	40	56	67	82	95	108
	7.6	91	90	87	84	83	77	73
	15.1	26	40	55	68	82	95	110	124	138
	15.1	184	182	179	178	173	168	163	157	127
	22.7	25	39	53	68	82	95	109	124	138
	22.7	277	276	270	268	265	256	254	245	210
	30.3	23	38	51	66	80	94	108	123	139
	30.3	370	368	362	359	356	384	344	355	293
	37.9	22	37	50	65	79	93	107	122	139
	37.9	426	46	452	450	446	436	432	432	376
	45.4	20	35	48	63	78	91	106	120	137
	45.4	555	552	544	540	536	527	521	511	457
	53		33	47	61	76	90	104	118	136
	53		634	633	629	626	616	611	599	535
	56.8			46	60	74	89	104	118	136
	56.8			670	674	671	659	654	642	574
	68			42	57	72	86	102	116
	68			811	808	804	791	787	772

100 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110	124	138
Flow, LPM	7.6	33	50	67	85	103	123	141
	7.6	73	72	69	67	65	61	57
	15.1	32	49	67	84	102	122	141	154	173
	15.1	149	147	144	142	140	135	131	125	99
	22.7	30	48	66	84	102	120	140	155	172
	22.7	224	222	219	217	213	208	204	196	165
	30.3	28	46	4	81	99	117	1308	151	173
	30.3	299	298	293	290	288	282	271	271	235
	37.9	26	44	61	79	97	114	138	149	172
	37.9	374	372	366	364	361	354	351	343	302
	45.4	25	43	59	77	95	112	131	147	169
	45.4	448	447	440	437	434	426	422	414	368
	53	22	40	58	75	94	110	129	143	168
	53	522	520	512	510	509	500	495	485	436
	56.8		39	56	74	93	107	127	141	168
	56.8		558	549	547	545	535	531	521	468
	68		35	51	71	89	104	125	140
	68		669	660	657	654	644	641	680

125 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	100	124	138
Flow, LPM	7.6	43	64	86	108	130	157
	7.6	61	59	56	54	51	49
	15.1	42	63	85	106	129	156	194	216
	15.1	121	119	116	112	110	107	103	99
	22.7	42	63	84	106	128	156	192	215
	22.7	182	180	1//	1M	171	168	165	162
	30.3	41	62	83	105	128	155	191	213
	30.3	243	240	238	235	232	230	227	225
	37.9	40	61	83	104	126	155	190	213
	37.9	304	302	319	317	314	311	308	305
	45.4	38	61	82	102	125	154	190	212
	45.4	364	361	385	355	351	347	343	341
	53	36	60	81	101	124	152	189	211
	53	424	421	418	415	412	408	409	401
	56.8		58	80	99	122	151	187	211
	56.8		452	450	447	443	440	438	436
	68		57	79	97	121	149	185	209
	68		544	542	539	536	533	531	527

160 cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	115	124
Flow, LPM	7.6	56	85	113	141	175	206
	7.6	46	45	42	39	37	35
	15.1	54	79	111	140	173	205
	15.1	94	93	91	88	84	79
	22.7	55	78	111	142	174	205	228	261
	22.7	143	140	138	136	133	127	123	119
	30.3	51	81	109	139	171	203	226	258
	30.3	190	187	186	183	179	175	168	166
	37.9	45	75	110	135	171	199	230	256
	37.9	237	235	232	231	225	220	214	213
	45.4	40	65	102	134	163	192	212	247
	45.4	285	285	281	279	276	267	263	258
	53	38	61	98	129	158	189	212	246
	53	332	330	328	326	323	318	313	309
	56.8		57	95	126	154	182	209	240
	56.8		354	350	345	348	346	342	338
	68		52	90	119	147	176	200	229
	68		425	421	421	418	417	415	412

ZMP Series Motor Performance Data at Different Operating Points

Cont. Int.

200cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110	124
Flow, LPM	7.6	69	102	135	173	215	252	281
	7.6	37	35	33	30	2	23	19
	15.1	70	103	141	177	213	215	280	319
	15.1	75	/3	70	6	62	57	51	49
	22.7	64	95	135	176	215	248	238	318
	22.7	114	113	113	111	107	103	101	100
	30.3	58	92	128	172	209	245	285	318
	30.3	153	152	150	147	144	140	135	133
	37.9	63	96	135	173	210	247	282	315
	37.9	192	190	181	182	1"	173	167	165
	45.4	56	90	130	164	203	240	271	309
	45.4	230	228	226	223	219	214	210	208
	53		88	128	161	201	238	270	308
	53		267	264	262	256	252	246	242
	56.8		86	125	158	179	233	263	301
	56.8		284	282	279	278	275	2M	269
	68		81	118	152	192	226	265	295
	68		339	337	336	333	331	328	324

250cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	100	124
Flow, LPM	7.6	76	115	160	209	253	304
	7.6	28	27	25	24	22	19
	15.1	76	116	159	207	252	303	378
	15.1	62	61	59	58	55	48	48
	22.7	71	108	153	201	250	301	378
	22.7	93	92	90	87	83	76	75
	30.3	63	102	150	200	249	297	376
	30.3	124	124	122	119	115	109	107
	37.9	58	101	147	195	242	293	372
	37.9	157	156	154	150	146	139	137
	45.4	48	90	136	185	230	284	368
	45.4	188	187	185	180	176	171	169
	53	47	84	133	179	219	275	366
	53	219	218	216	213	209	200	175
	56.8		81	129	171	204	273	365
	56.8		235	234	232	229	228	228
	68		81	129	170	202	270	362
	68		281	280	278	272	273	269

305cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	97	110
Flow, LPM	7.6	97	145	206	260	326	352
	7.6	23	22	20	19	16	12
	15.1	100	147	204	259	325	361	403
	15.1	47	45	44	42	37	34	31
	22.7	97	140	188	262	320	364	401
	22.7	70	69	68	64	60	55	49
	30.3	91	135	195	256	315	357	395
	30.3	94	94	92	88	83	79	75
	37.9	75	125	185	247	305	350	393
	37.9	118	117	115	112	109	104	100
	45.4	68	127	191	250	305	348	392
	45.4	143	142	140	138	134	130	128
	53	65	113	177	240	296	342	390
	53	167	166	164	162	158	153	149
	56.8		108	170	234	290	338	390
	56.8		178	178	176	175	172	168
	68		102	168	233	288	336	387
	68		208	208	207	205	201	199

400cc/r

		Pressure difference, ΔBar
		28	41	55	69	83	90
Flow, LPM	7.6	153	235	323	411	496
	7.6	14	13	10	10	8
	15.1	142	215	305	390	485	485
	15.1	30	28	27	23	21	18
	22.7	133	205	302	386	437	483
	22.7	46	45	43	39	33	29
	30.3	123	184	296	370	466	506
	30.3	62	61	58	56	51	48
	37.9	120	181	282	378	467	516
	37.9	78	76	75	71	66	62
	45.4	110	192	287	377	457	510
	45.4	93	92	90	85	80	76
	53	91	166	251	342	417	475
	53	109	108	106	101	96	93
	56.8		165	249	338	403	471
	56.8		115	111	109	102	101
	68		159	242	327	389	448
			136	134	129	127	122

The above data are measured at the oil temperature of 50 ℃ and with 68# anti-wear hydraulic oil.

The actual test data may vary slightly from the data in the above table.

ZMP Series Motor Dimensions and Mounting Data

Displacement, cc/r	50	63	80	100	125	160	200	250	305	400
L mm	141.5	143.8	147	150.3	155.5	161.5	169.5	178.5	188.5	204.5

Standard direction of rotation: when facing shaft end of motor, shaft to rotate clockwise when the oil is fed at port A and discharged at port B, and vice versa.

ZMP Series Motor - Flange Dimensions and Mounting Data

ZMP Series Motor - Output Shaft Dimensions and Mounting Data

Note: When a motor is ordered, the model and product number should be selected in the Motor Ordering Information based on the reference dimensions in the above figure; if the corresponding Dimensions and Mounting Data and product number can not be found in the ordering specifications, please contact the company marketing department.

ZMP-1 Series Motor Dimensions and Mounting Data

Port Dimension Table:

Port number	Main port D	External drain port C
Y01	M18X1.5	M14X1.5
Y02	M20X1.5	M14X1.5
Y03	G1/2	G1/4
Y04	7/8-14UNF	7/16-20UNF

Displacement, cc/r	50	63	80	100	125	160	200	250	305	400
L mm	129.5	131.8	135	138.3	143.5	149.5	157.5	166.5	176.5	192.5

Standard direction of rotation: when facing shaft end of motor, shaft to rotate clockwise when the oil is fed at port A and discharged at port B, and vice versa.

ZMP-1 Series Motor - Flange Dimensions and Mounting Data

ZMP-1 Series Motor - Port Dimensions and Mounting Data

ZMP-TC Series Motor Dimensions and Mounting Data

Displacement, cc/r	50	63	80	100	125	160	200	250	305	400
L mm	111.5	113.8	117	120.3	125.5	131.5	139.5	148.5	158.5	174.5

Standard direction of rotation: When facing shaft end of motor, shaft to rotate clockwise when the oil is fed at port A and discharged at port B, and vice versa.

ZMPB Series Brake Motor Dimensions and Mounting Data

Displacement, cc/r	50	63	80	100	125	160	200	250	305	400
L mm	210	212.3	215.5	218.8	224	230	238	247	257	273

For Dimensions and Mounting Datas of output shaft, flange, port and others of ZMPB series brake motor, see ZMP series motor Dimensions and Mounting Data.

ZMP Series Motor Ordering Information

Dimension				Displacement
Flange	Output shaft	Straight port surface	Port		50	63	80	100	125	160	200	250	320	400
2-hole rhombic flange, seam allownceΦ82.55	Φ25 straight shaft flat key 6.35		Port G1/2, internal drain port		150-0050	0051	0052	0053	0059	0054	0055	0056	0057	0058
	Φ25.4 straight shaft flat key 6.35		Port G1/2, internal drain port		150-0060	0061	0062	0063	0069	0064	0065	0066	0067	0068
	Φ25.4 straight shaft flat key 6.35		Port G1/2, external drain port M14×1.5		150-0090	0091	0092	0093	0099	0094	0095	0096	0097	0098
	Φ25 straight shaft flat key 8		Port G1/2, external drain port M14×1.5		150-0080	0081	0082	0083	0089	0084	0085	0086	0087	0088
	Φ25 straight shaft flat key 8		Port G1/2, internal drain port		150-0160	0161	0162	0163	0169	0164	0165	0166	0167	0168
	Φ25 straight shaft flat key 8		Port M18×1.5, external drain part M14×1.5		150-0040	0041	0042	0043	0049	0044	0045	0046	0047	0048
4-hole square flange, seam allownceΦ82.55	Φ25 straight shaft flat key 8		Port M18×1.5, internal drain port		150-0260	0261	0262	0263	0269	0264	0265	0266	0267	0268
4-hole square flange, seam allownceΦ80	Rectangular spline 6D-25×22×6		Port M18×1.5, external drain part M14×1.5		150-1110	1111	1112	1113	1119	1114	1115	1116	1117	1118
	Φ25 straight shaft flat key 8		Port M18×1.5, external drain part M14×1.5		150-0020	0021	0022	0023	0029	0024	0025	0026	0027	0028
	Φ25 straight shaft flat key 8		Port M18×1.5, internal drain port		150-0010	0011	0012	0013	0019	0014	0015	0016	0017	0018
4-hole square flange, seam allownceΦ82.55	Φ25 straight shaft flat key 8		Port M18×1.5, external drain part M14×1.5		150-0120	0121	0122	0123	0129	0124	0125	0126	0127	0128
Long square flange seam allownceΦ85	6D-25×22×6		Port M20×1.5, external drain port M14×1.5		150-1140	1141	1142	1143	1149	1144	1145	1146	1147	1148
2-hole rhombic flange, seam allownceΦ82.55	Φ25.4 straight shaft flat key 6.35	Staggered port surface	Port G1/2, internal drain port		150-0340	0341	0342	0343	0349	0344	0345	0346	0347	0348
	Φ25 straight shaft flat key 8		Port G1/2, external drain port M14X1.5		150-0350	0351	0352	0353	0359	0354	0355	0356	0357	0358
	Φ25 straight shaft flat key 8		Port G1/2, internal drain port		150-0430	0431	0432	0433	0439	0434	0435	0436	0437	0438
	Φ25.4 straight shaft flat key 6.35		Port G1/2, external drain port M14×1.5		150-0360	0361	0362	0363	0369	0364	0365	0366	0367	0368
	Φ25 straight shaft flat key 8		Port 1/2NPTF, external drain port M14×1.5		150-0370	0371	0372	0373	0379	0374	0375	0376	0377	0378
	Φ25 straight shaft flat key 8		Port G1/2, external drain port G1/4		150-0380	0381	0382	0383	0389	0384	0385	0386	0387	0388
	Φ25.4 straight shaft flat key 6.35		Port 1/2NPTF, internal drain port		150-0440	0441	0442	0443	0449	0444	0445	0446	0447	0448
	Φ25.4 straight shaft flat key 6.35		4-M8 plate type, internal drain port		150-0450	0451	0452	0453	0459	0454	0455	0456	0457	0458
	Φ25 straight shaft flat key 8		1/2 NPTF, external drain port G1/4		150-2100	2101	2102	2103	2109	2104	2105	2106	2107	2108

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