Planetary Wheel Drive Gearbox for Backhoe Loaders

The planetary wheel drive gearbox for backhoe loaders is a compact epicyclic gear system designed for torque multiplication and speed reduction, enabling efficient power transmission directly to the wheels or hubs in heavy-duty construction equipment. It comprises key components, including a central sun gear that receives input from the drive shaft, multiple planet gears that orbit the sun while meshing with it and an outer ring gear, and a carrier that secures the planet gears and delivers output torque. This arrangement distributes load evenly across the gears, providing high torque output in a space-efficient design, which is crucial for maintaining stability and performance on uneven terrain.

In backhoe loaders, the gearbox integrates into the drivetrain often as part of automatic transmissions to facilitate smooth gear ratio changes via hydraulic controls, enhancing propulsion, traction, digging force, and maneuverability during earth-moving tasks. By reducing gear speed while increasing torque, it allows the machine to generate substantial power at lower RPMs, improving fuel efficiency, durability, and productivity across applications involving backhoe loader brands such as JCB, Case, Caterpillar, and John Deere.

Planetary Wheel Drive Dimensions

Technical Definitions

Symbols	Units of measurement	Description
i	-	Reduction ratio
T2max	[Nm]	Maximum output torque
T2p	[Nm]	Peak output torque
T2maxint	[Nm]	Maximum intermittent torque
T2cont	[Nm]	Continuous output torque
Pcont	[kW]	Maximum continuous power
Pint	[kW]	Maximum intermittent power
n1max	[rpm]	Maximum input speed
n2max	[rpm]	Maximum output speed

GR 80

Type	Motor disp. [cc]	Total disp. [cc]	i	Torque						Speed n2max		Power
				T2cont		T2maxint		T2p				Pcont [kW]	Pint [kW]
				[Nm]	Δp [bar]	[Nm]	Δp [bar]	[Nm]	Δp [bar]	[rpm]	portata flow [l/min]
GR80-MR50	51,6	269,9	5,23	470	145	570	175	630	205	115	30	5,5	7
GR80-MR80	80,3	420,0		800	145	960	175	1060	205	68	30	5,5	7
GR80-MR100	99,8	522,0		800	115	1000	145	1310	205	55	30	5,5	7
GR80-MR125	125,7	657,4		800	95	1000	120	1500	190	45	30	5,5	7
GR80-MR160	159,6	834,7		800	75	1000	95	1500	145	33	30	5	7
GR80-MR200	199,8	1045,0		800	60	1000	75	1500	115	26	30	5	7
GR80-MR250	249,3	1303,8		800	50	1000	60	1500	95	21	30	4,5	6

GR 200

Type	Motor disp. [cc]	Total disp. [cc]	i	Torque						Speed n2max		Power
				T2cont		T2maxint		T2p				Pcont [kW]	Pint [kW]
				[Nm]	Δp [bar]	[Nm]	Δp [bar]	[Nm]	Δp [bar]	[rpm]	portata flow [l/min]
GR200-MR50	51,6	319,9	6,20	560	145	670	175	740	205	98	30	5,5	7
GR200-MR80	80,3	497,9		950	145	1150	175	1250	205	58	30	5,5	7
GR200-MR100	99,8	618,8		1180	145	1420	175	1560	205	46	30	5,5	7
GR200-MR125	125,7	779,3		1450	145	1750	175	1920	205	38	30	5,5	7
GR200-MR160	159,6	989,5		1600	125	2100	165	2450	205	29	30	5	7
GR200-MR200	199,8	1238,8		1600	100	2150	135	2500	165	23	30	5	7
GR200-MR250	249,3	1545,7		1600	80	2150	105	2500	135	18	30	4,5	6
GR200-MR315	315,7	1957,3		1600	65	2150	85	2500	110	15	30	4	5
GR200-MR375	372,6	2310,1		1600	55	2150	70	2500	90	12	30	3,5	4,5

EH 210

Type		Weight		Oil quantity		i (da÷a / From÷to)		T2max [Nm]	n1max [rpm]
		EH 212	EH 213	EH 212	EH 213	EH 212	EH 213
EH 210 S		35	40	0.8	1	11 ÷ 29	41 ÷ 129	3950	3500
EH 210 SC
EH 210 PD			-		-

EH 240

Type		Weight		Oil quantity		i (da÷a / From÷to)		T2max [Nm]	n1max [rpm]
		EH 242	EH 243	EH 242	EH 243	EH 242	EH 243
EH 240 S		35	40	0.8	1	12 ÷ 31	45 ÷ 135	5600	3500
EH 240 SC
EH 240 PD			-		-

EH 350

Type		Weight		Oil quantity		i (da÷a / From÷to)		T2max [Nm]	n1max [rpm]
		EH 352	EH 353	EH 352	EH 353	EH 352	EH 353
EH 350 S		55	60	1	1.2	15 ÷ 31	52 ÷ 135	7200	3500
EH 350 PD

EH 610

Type		Weight		Oil quantity		i (da÷a / From÷to)		T2max [Nm]	n1max [rpm]
		EH 612	EH 613	EH 612	EH 613	EH 612	EH 613
EH 610 S		60	70	1.2	1.5	12 ÷ 31	47 ÷ 138	13500	3500
EH 610 PD

EH 910

Type		Weight	Oil quantity	i (da÷a / From÷to)	T2max	n1max
		EH 913	EH 913	EH 913	[Nm]	[rpm]
EH 910 S		130	1	47 ÷ 131	24200	3500
EH 910 PD

S Version

Size	Dimensions
	D1	D2	D3	D4	D5	D6	D7	D8	L1	L2	L3
EH 210 S	230	200	180 h9	190 h9	210	229.5	M10 n°8	M10 n°8	253	73	180
EH 240 S	230	200	180 h9	190 h9	210	229.5	M10 n°8	M10 n°8	253	73	180
EH 350 S	270	230	190 h8	200 h7	240	280	M16 n°8	M16 n°8	242	107	178
EH 610 S	260	230	190 f7	220 h7	260	286	M16 n°12	M16 n°16	243	72	171
EH 910 S	330	300	270 f7	280 h7	350	370	M16 n°18	M16 n°18	368	115	253

PD Version

Size	Dimensions
	D1	D2	D3	D4	D5	D6	D7	D8	L1	L2	L3
EH 210 PD	230	200	180 h9	160.8 f8	205	240	M10 (8x)	M18x1.5 (6x)	210	140	70
EH 240 PD	230	200	180 h9	160.8 f8	205	240	M10 (8x)	M18x1.5 (6x)	210	140	70
EH 350 PD	240	209.55	177.8 h8	200 h7	241.3	280	5/8"-11 UNC (6x)	5/8"-19 UNF (9x)	285	107	178
EH 610 PD	260	230	190 f7	220 h7	275	310	M16 (12x)	M20x1.5 (8x)	293	72	221
EH 910 PD	330	300	270 f7	280 h7	335	375	M16 (18x)	M22x1.5 (10x)	368	115	253

Features of Planetary Wheel Drive for Backhoe Loaders

1. Compact and Space-Saving Design
The planetary wheel drive gearbox for backhoe loaders features a highly compact structure that integrates multiple gears within a confined space, allowing for efficient installation in the limited chassis area of heavy machinery. This design optimizes weight distribution, enhances machine stability during operations on uneven terrain, and facilitates easier maintenance without compromising performance.

2. High Torque Transmission Capability
Engineered to deliver exceptional torque multiplication, this planetary gearbox employs a system of sun, planet, and ring gears that distribute load evenly across multiple contact points, enabling backhoe loaders to handle demanding tasks such as digging and lifting heavy loads with superior power output at lower speeds.

3. Superior Transmission Efficiency
With minimal energy loss due to its epicyclic gearing mechanism, the wheel drive planetary gearbox ensures high mechanical efficiency, often exceeding 95%, which translates to improved fuel economy and reduced operational costs for backhoe loaders in prolonged construction or earth-moving applications.

4. Customizable Gear Ratios for Versatility
This planetary wheel drive offers flexible gear ratio configurations that can be tailored to specific operational needs, providing versatile speed control and adaptability for various tasks, thereby enhancing the overall productivity and maneuverability of backhoe loaders across diverse job sites.

5. Enhanced Durability and Load Distribution
By distributing mechanical stress across several planet gears, the wheel drive gearbox exhibits remarkable durability and resistance to wear, ensuring reliable performance under high-stress conditions typical in backhoe loader operations, such as continuous digging and material handling.

6. Low Noise and Smooth Operation
Featuring multi-tooth engagement that reduces vibration and noise levels, this planetary gear reducer promotes a quieter working environment while delivering smooth power transmission, which is essential for operator comfort and precision control in backhoe loaders during extended use on construction projects.

Wheel Drive Planetary Gearbox Applications

1. Construction Industry
Wheel drive planetary gearboxes are extensively utilized in the construction sector for powering heavy machinery such as backhoe loaders, excavators, and compact track loaders, providing high torque and compact design essential for navigating rugged terrains and performing demanding tasks like digging and material transport with enhanced efficiency and reliability.

2. Agricultural Machinery
In agriculture, planetary wheel drive gearboxes facilitate the operation of tractors, harvesters, and sprayers by delivering superior torque multiplication and speed reduction, enabling precise control over field operations, improved traction on uneven soil, and increased productivity during planting, harvesting, and tillage activities.

3. Mining and Quarrying
These planetary gearboxes are critical in mining equipment, including haul trucks, wheel loaders, and drilling rigs, where they ensure robust torque transmission under extreme loads and harsh environments, supporting efficient extraction processes, enhanced vehicle stability, and reduced downtime for maintenance.

4. Material Handling Equipment
Wheel drive gearboxes enhance the performance of forklifts, telehandlers, and warehouse vehicles by offering compact integration and high load-bearing capacity, which optimizes maneuverability in confined spaces, improves lifting capabilities, and contributes to safer, more efficient logistics operations in industrial settings.

5. Forestry Applications
In forestry machinery such as forwarders, harvesters, and skidders, these planetary gear reducers provide the necessary power for wheel drives to handle dense woodlands and steep slopes, ensuring reliable propulsion, better fuel efficiency, and durability against impacts from logs and debris during timber harvesting.

6. Airport Ground Support
Planetary wheel drives are applied in airport ground support equipment like baggage tugs, pushback tractors, and de-icing vehicles, delivering precise torque control for smooth operations on tarmacs, enhancing vehicle responsiveness, and supporting high-duty cycles essential for timely aircraft servicing and passenger safety.

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Working Principle of Planetary Wheel Drive Gearbox

The working principle of a planetary wheel drive gearbox for backhoe loaders revolves around an epicyclic gear system that efficiently transmits power from the engine or hydraulic system to the wheels, enabling high torque output in a compact form suitable for heavy-duty construction tasks. At its core, the planetary gearbox consists of three primary components: a central sun gear, multiple planet gears mounted on a carrier, and an outer ring gear.

Power enters the system through an input shaft connected to the sun gear, which rotates and meshes with the surrounding planet gears. As the sun gear turns, it drives the planet gears to orbit around it while they simultaneously rotate on their axes, engaging with the fixed or stationary ring gear. This dual motion rotation and revolution creates a compounding effect that reduces speed and multiplies torque, with the planet carrier serving as the output mechanism that delivers amplified power directly to the wheel hubs or axles.

In backhoe loaders, this configuration is particularly advantageous for operations on uneven terrain, as it allows for double-stage reduction in some designs, further enhancing torque for digging, loading, and propulsion while maintaining low speeds for precise control. The even load distribution across multiple planet gears minimizes wear, improves durability under extreme loads, and supports seamless integration with the drivetrain, often incorporating hydraulic controls for smooth shifting. For instance, in heavy machinery like backhoe loaders, the planetary setup can achieve high gear ratios, enabling the vehicle to handle substantial payloads without straining the engine, thus optimizing fuel efficiency and operational reliability.