Hydraulic Drive Motor

 

 

Hydraulic motors serve as rotary actuators that utilize fluid pressure to generate mechanical motion. Within hydraulic systems, these components transform hydraulic energy into rotational mechanical energy, enabling the operation of connected machinery and equipment.

The core components of a hydraulic motor include the motor housing, fluid chambers, rotor assembly, and hydraulic ports. While similar in construction to hydraulic pumps, these devices perform the reverse function: where pumps convert mechanical energy into hydraulic energy, motors convert hydraulic energy back into mechanical rotation.

Hydraulic motor operation is based on hydrostatic principles, where fluid pressure remains constant during motion transmission. High-pressure fluid enters the motor, acting upon the rotor to generate torque at the output shaft, thereby producing mechanical movement.

 

 

Hydraulic motors find extensive application in various equipment including drilling rigs, excavators, and forklift trucks. One significant application involves driving wheels through hydraulic power.

When pressurized fluid enters the motor, it drives the rotor mechanism-whether through gear, vane, or belt systems-increasing rotational speed. This motion transfers through bearings to the wheel assembly, creating wheel rotation. The system stops when hydraulic pressure decreases or the motor ceases operation.

The primary advantages of hydraulic wheel drive systems include high torque output and excellent acceleration characteristics. The hydraulic system provides adjustable pressure for precise speed control. Limitations include relatively large physical dimensions, making them less suitable for compact vehicles, and higher implementation costs.

 

 

 

Hydraulic motor wheel drives are particularly suitable for applications requiring substantial torque, wide speed ranges, or frequent speed adjustments:

1. Forklifts: Commonly employ hydraulic motors to drive front wheels, providing forward/reverse movement, acceleration, and braking functions

2. Excavators: Ideal for harsh operating conditions requiring high torque and variable speed capabilities

3. Milling Machines: Used in feed mechanisms where precise movement and maintenance simplicity are essential

 

 

 

 

 

Displacement, cc/r		195	245	310	390	490	625	800	985
Flow, LPM	Cont.	150	150	150	150	150	150	150	150
	Int.	170	210	225	225	225	225	225	225
Speed, RPM	Cont.	775	615	485	387	307	241	184	153
	Int.	866	834	698	570	454	355	278	230
Pressure, MPa	Cont.	20.5	20.5	20.5	20.5	17	14	12	12
	Int.	25	25	25	25	21	17	14	14
Torque, Nm	Cont.	541	680	860	1082	1150	1185	1300	1600
	Int.	660	830	1050	1320	1400	1450	1520	1875
Max. allowable back pressure		10MPa

 

◎ Intermittent operating pressure indicates maximum allowable inlet pressure; Continuous operating pressure refers to differential between inlet and return ports
◎ Avoid simultaneous operation at maximum speed and maximum pressure
◎ Intermittent operation must not exceed 10% of any one-minute period
◎ Recommended fluid: anti-wear hydraulic oil with viscosity 37–73 cSt and cleanliness ISO 18/13
◎ Maximum oil temperature: 80°C
◎ Special dynamic seal design accommodates back pressure up to 10 MPa; for optimal performance maintain below 5 MPa
◎ If exceeded, connect external drain while ensuring motor remains oil-filled. Throttle drain to maintain back pressure above 3.5 Bar, aiding contaminant removal and cooling
◎ Execute run-in procedure before full-load operation: operate at 30% of maximum pressure for 1 hour

 

 

 Cont.    Int.

 

195cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240	275
Flow, LPM	1.9	75	165	260
		7	5	2
	7.5	75	170	265	350	440	470
		37	35	34	30	26	18
	15	80	175	270	365	455	520	590	655
		76	74	72	66	62	46	32	18
	30	85	180	275	370	465	545	625	705
		153	148	144	131	119	116	99	83
	45	85	180	280	375	475	565	655	750
		230	225	221	212	203	186	167	148
	61	80	180	280	375	475	575	665	760
		307	303	300	291	283	258	236	214
	76	80	180	280	380	480	575	670	770
		384	379	374	365	356	332	306	280
	91	80	175	275	375	475	575	670	770
		462	456	450	440	429	413	388	363
	106	75	175	270	375	475	570	670	770
		539	532	526	514	502	476	448	421
	121	70	170	270	370	470	570	670	765
		617	609	602	589	576	542	511	480
	136	70	165	265	365	465	565	665	765
		692	683	674	659	645	601	564	527
	151	70	165	260	365	465	560	660
		770	759	746	733	718	666	624
	170	65	160	260	360	460	555	655
		866	854	843	825	808	749	702

 

The motor is highly efficient at all operating points with specified data, but it is recommended to operate it in the continuous operating area for the optimum efficiency and long service life.

 

245cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240	275
Flow, LPM	1.9	95	215
		4	1
	7.5	100	220	340	445	555	570	670
		29	26	24	21	17	11	6
	15	105	225	345	460	575	640	750	855
		60	56	54	48	42	39	30	12
	30	110	235	355	475	595	700	800	905
		120	116	113	104	95	81	67	53
	45	110	235	360	480	605	720	840	955
		182	178	174	165	157	141	125	109
	61	110	235	360	485	610	730	845	960
		244	240	236	228	221	202	184	165
	76	105	230	355	485	615	735	855	980
		306	301	297	287	277	257	238	218
	91	105	230	355	480	610	735	860	980
		365	361	358	348	338	316	294	271
	106	100	225	350	480	610	730	855	980
		426	421	416	404	376	358	340	322
	121	90	215	345	470	600	725	850	975
		489	481	475	461	448	423	398	373
	136	80	210	335	460	580	710	840
		549	543	537	524	509	482	456
	151	80	200	330	455	580	700	800
		612	606	599	585	570	540	510
	170	65	200	325	445	575	685	755
		688	682	674	685	641	608	574
	189		195	315	440	555	670
			758	749	731	712	676
	208		190	310	430	550	665
			834	824	804	783	744

 

The above data are measured at the oil temperature of 50℃ and with 68# anti-wear hydraulic oil; for different motors, the data will be slightly different.

 

 

 Cont.    Int.

 

310cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240	275
Flow, LPM	1.9	60	125	275
		6	4	1
	7.5	130	280	410	540	646	755	880
		23	22	20	17	14	10	4
	15	135	290	430	570	685	800	935	1025
		47	45	42	38	32	24	17	10
	30	140	300	450	595	730	870	985	1105
		95	91	87	81	73	64	55	46
	45	140	305	460	610	760	910	1045	1185
		143	140	135	129	121	111	99	88
	61	140	300	460	615	770	920	1060	1205
		192	188	184	178	167	156	141	126
	76	135	295	455	615	770	925	1075	1225
		241	236	323	226	216	201	184	167
	91	130	295	455	615	775	930	1080	1230
		289	282	279	273	260	248	232	215
	106	130	290	450	610	770	930	1075	1225
		336	333	328	320	308	295	276	257
	121	125	285	445	600	765	920	1065
		384	381	375	368	354	341	320
	136	130	375	435	590	750	915	1055
		430	421	416	410	396	383	360
	151	115	270	426	480	745	905	1040
		487	466	461	456	441	427	403
	189	110	245	385	525	685	840
		597	582	576	570	551	534
	227		220	365	515	650	800
			698	691	684	661	641

 

The motor is highly efficient at all operating points with specified data, but it is recommended to operate it in the continuous operating area for the optimum efficiency and long service life.

 

390cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240	275
Flow, LPM	3.8	175	365
		2	1
	7.5	180	370	555	730	875	1025	1195
		18	17	16	14	12	9	4
	15	185	375	560	740	920	1080	1275	1370
		38	37	35	33	29	22	14	5
	30	185	380	575	760	950	1135	1315	1455
		76	74	72	68	65	55	45	33
	45	185	385	580	770	965	1150	1340	1540
		115	112	109	105	100	91	81	79
	61	180	380	580	770	965	1155	1345
		154	151	147	143	132	126	116
	76	180	380	580	775	970	1160	1355
		193	189	187	182	175	162	152
	91	170	370	570	765	965	1155
		230	229	225	220	212	204
	106	165	365	565	760	960	1150
		268	266	261	256	248	236
	121	160	355	555	750	945	1145
		306	304	299	292	282	269
	136	155	340	545	730	730	1130
		346	340	336	329	317	301
	151	150	325	535	730	915
		386	380	375	368	359
	189	130	300	515	730	910
		482	475	469	460	449
	227		280	500	720	890
			570	562	552	538

 

The above data are measured at the oil temperature of 50℃ and with 68# anti-wear hydraulic oil; for different motors, the data will be slightly different.

 

 

 Cont.    Int.

 

490cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240
Flow, LPM	3.8	235	480	695
		7	5	3
	7.5	240	480	710	945	1175	1370
		14	13	12	11	8	3
	15	235	485	725	960	1195	1410	1645
		30	29	28	27	25	21	17
	30	235	485	735	975	1215	1445	1685
		60	59	57	54	51	45	38
	45	235	485	735	975	1220	1455
		91	89	87	84	79	71
	61	235	480	730	975	1220	1460
		122	121	118	114	109	100
	76	225	470	725	975	1220
		152	150	147	144	139
	91	220	470	720	970	1215
		184	181	180	176	171
	106	210	460	710	960	1210
		214	211	208	204	198
	121	195	450	700	950	1205
		244	241	237	232	226
	136	175	435	685	940	1175
		275	272	265	260	255
	151	160	425	675	920	1150
		306	303	295	290	284
	189	130	365	59	860
		382	379	369	362
	227		325	550	805
			454	442	435

 

The motor is highly efficient at all operating points with specified data, but it is recommended to operate it in the continuous operating area for the optimum efficiency and long service life.

 

625cc/r		Pressure, ΔBar
		35	50	70	85	105	120	140
Flow, LPM	3.8	250	380	510	640	755
		5	4	4	3	2
	7.5	260	395	535	670	795	925	1060
		12	13	13	10	10	8	6
	15	275	425	570	710	850	955	1065
		24	24	24	22	21	18	16
	30	295	450	605	755	925	1095	1270
		45	44	44	43	42	39	37
	45	295	450	610	765	920	1125	1330
		72	71	71	70	68	66	64
	61	285	445	605	760	915	1120	1325
		94	93	92	91	89	87	85
	76	280	440	595	755	915	1125	1325
		119	118	117	116	115	112	110
	91	265	430	585	745	905	1110	1320
		143	142	140	139	138	135	132
	106	255	415	575	735	895	1105	1315
		168	166	165	164	162	159	156
	121	240	400	560	720	880	1090	1300
		192	190	188	187	185	182	179
	136	220	380	540	700	855	1050
		216	214	213	212	210	207
	151	200	360	520	680	835	1015
		240	239	238	237	236	233
	189		310	470	630	790
			298	296	294	290
	227		255	430	590	745
			355	353	350	345

 

The above data are measured at the oil temperature of 50℃ and with 68# anti-wear hydraulic oil; for different motors, the data will be slightly different.

 

 

 Cont.    Int.

 

800cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240
Flow, LPM	1.9	420	590	776	960
		4	4	3	2
	7.5	420	594	790	972	1176	1344	1568
		4	8	8	7	6	5	4
	15	435	608	840	1020	1204	1308	1650
		18	17	17	16	15	14	13
	30	420	396	830	1005	1204	1415	1610
		36	35	35	34	33	31	29
	45	380	565	795	972	1190	1362
		55	55	54	54	53	51
		340	520	760	940	1172
	61	75	74	72	71	70
		325	500	730	900	1140
	76	93	92	90	89	87
		315	470	700	860	1080
	91	111	110	109	108	105
		310	450	650	800 125	1020
	106	129	128	127		123
		280	420	610	750
	121	148	146	145	143
		270	400	550	700
	136	166	165	165	164
		250	350	500	635
	151	184	183	182	180
			300	440	580
	189		230	228	225
				380	520
	227			276	273

 

The motor is highly efficient at all operating points with specified data, but it is recommended to operate it in the continuous operating area for the optimum efficiency and long service life.

 

985cc/r		Pressure, ΔBar
		35	70	105	140	170	205	240	275
Flow, LPM	3.8	215	465	645	865	1080
		3	3	2	2	1
	7.5	215	470	710	940	1175	1410	1565	1685
		8	8	7	7	6	5	4	3
	15	225	485	775	965	1205	1445	1570	1790
		15	15	15	14	14	13	13	13
	30	230	490	750	995	1235	1480	1640	1875
		30	30	30	29	28	27	26	25
	45	230	495	750	1000	1250	1495	1700
		45	45	45	44	43	42	41
	61	225	490	740	995	1245	1500
		61	61	61	60	59	58
	76	215	475	730	985	1235	1485
		77	77	76	76	75	74
	91	205	460	705	960	1220	1470
		92	92	92	91	90	89
	106	185	445	700	950	1200	1450
		107	107	107	106	105	103
	121	165	425	675	925	1160
		123	123	122	121	120
	136	130	395	645	895	1125
		138	138	138	137	135
	151	95	365	610	865	1085
		153	153	152	151	150
	189		325	585	830	1050
			191	190	189	188
	227			525	810	1025
				230	229	226

 

The above data are measured at the oil temperature of 50℃ and with 68# anti-wear hydraulic oil; for different motors, the data will be slightly different.

 

 

 

Displacement, cc/r	195	245	310	390	490	625	800	985
L mm	253.2	258.8	266	276.5	285.9	300.5	321.5	340.3

 

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.

 

 

 

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.

 

 

 

 

 

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