246-0059 O&KSH630 1772342 3688052 368-2783-01 171-1881 242-4042-02 Caterpillar Excavator Engine Radiator Fan Hydraulic Motor

A2FM Hydraulic Motor: The Robust Heart of Engine Cooling in Caterpillar Excavators

For Caterpillar excavators operating in the world’s most demanding environments—from scorching mines to frozen quarries—optimal engine temperature is non-negotiable. The radiator fan is the frontline defense against overheating, and its driving force must be as reliable as the machine itself. The A2FM series bent-axis axial piston motor is engineered to be that critical component, providing the precise, powerful, and utterly dependable drive required for Caterpillar’s Engine Radiator Fan systems. For complete technical specifications and performance data, download our detailed PDF from www.baolilai-pump.com/contact_us/.

Technical Specifications: A2FM Hydraulic Motor

Parameter	Value Range
Displacement Range	10.3 – 1000 cm³/rev
Operating Pressure	315 – 450 bar
Maximum Speed	1600 – 11000 rpm

Size			5	10	12	16	23	28	32	45	56	63	80
Displacement	Vg	cm3	4,93	10,3	12	16	22,9	28,1	32	45,6	56,1	63	80,4
Max. Speed	nmax	min−1	10 000	8000	8000	8000	6300	6300	6300	5600	5000	5000	4500
	nmax intermit	min−1	11 000	8800	8800	8800	6900	6900	6900	6200	5500	5500	5000
Max.flow nmax	qV max	L/min	49	82	96	128	144	176	201	255	280	315	360
Torque constants	TK	Nm/bar	0,076	0,164	0,19	0,25	0,36	0,445	0,509	0,725	0,89	1,0	1,27
Torque at Δp=350 bar	T	Nm	24,7	57	67	88	126	156	178	254	312	350	445
Torque at Δp=400 bar	T	Nm	–	65	76	100	144	178	204	290	356	400	508
Case volume		L		0,17	0,17	0,17	0,20	0,20	0,20	0,33	0,45	0,45	0,55
Moment of inertia about drive axis	J	kgm2	0,00008	0,0004	0,0004	0,0004	0,0012	0,0012	0,0012	0,0024	0,0042	0,0042	0,0072
Weight (approx.)	m	kg	2,5	5,4	5,4	5,4	9,5	9,5	9,5	13,5	18	18	23

Size			90	107	125	160	180	200	250	355	500	710	1000
Displacement	Vg	cm3	90	106,7	125	160,4	180	200	250	355	500	710	1000
Max. Speed	nmax	min−1	4500	4000	4000	3600	3600	2750	2500	2240	2000	1600	1600
	nmax intermit	min−1	5000	4400	4400	4000	4000	3000	–	–	–	–	–
Max.flow nmax	qV max	L/min	405	427	500	577	648	550	625	795	1000	1136	1600
Torque constants	TK	Nm/bar	1,43	1,70	1,99	2,54	2,86	3,18	3,98	5,65	7,96	11,3	15,9
Torque at Δp=350 bar	T	Nm	501	595	697	889	1001	1114	1393	1978	2785	3955	5570
Torque at Δp=400 bar	T	Nm	572	680	796	1016	1144	1272	–	–	–	–	–
Case volume		L	0,55	0,8	0,8	1,1	1,1	2,5	3,5	–	–	–	7,8
Moment of inertia about drive axis	J	kgm2	0,0072	0,0116	0,0116	0,0220	0,0220	0,0378	0,061	0,102	0,178	0,55	0,55
Weight (approx.)	m	kg	23	32	32	45	45	66	73	110	155	322	336

Unmatched Durability for Extreme Conditions
Backed by a one-year warranty, the A2FM hydraulic motor is built to survive where others fail. Its core design principles focus on exceptional resistance to pressure shocks, contamination, and extreme thermal cycling. In the dusty, debris-filled environment around an excavator’s engine bay, standard motors can falter. However, the A2FM’s robust construction, high-grade materials, and advanced sealing—exemplified in models like 246-0059—ensure consistent performance. This resilience directly protects the excavator’s engine from catastrophic overheating, maximizing uptime for critical projects.

A Critical Component Across the Caterpillar Equipment Universe
The A2FM’s reliability makes it the preferred choice not just for excavator cooling, but across the vast Caterpillar (caterpillar.com) product line, where hydraulic system integrity is paramount.

• Mining & Heavy Earthmoving: Beyond the standard excavator, the massive cooling demands of Caterpillar mining shovels and ultra-class haul trucks are immense. These giants rely on high-capacity fan drives, often serviced with components like O&KSH630 and 1772342, to manage the tremendous heat generated by their powerful engines during continuous load cycles.
• Construction & Road Building: Motor graders and soil compactors operate under full load for extended periods. Their hydraulic systems require components that can maintain precise fan speed for optimal cooling efficiency, a task for which the A2FM, in configurations such as 3688052, is perfectly suited.
• Agricultural & Industrial Applications: Large Cat agricultural tractors and industrial power units also depend on reliable hydraulic cooling. The motor’s ability to provide steady airflow regardless of ambient chaff or temperature, a characteristic of parts like 368-2783-01, ensures engine longevity during harvest seasons or in remote industrial sites.

This cross-platform dependability is why the A2FM is frequently specified under various Caterpillar part numbers, including 171-1881 and 242-4042-02, solidifying its role as a cornerstone of thermal management in heavy machinery.

FAQ (Frequently Asked Questions)

Q1: Why is a hydraulic motor preferred over an electric one for heavy-equipment radiator fans?
A1: Hydraulic drives offer superior power density and torque in a compact size. They are inherently more resistant to heat, vibration, and environmental contaminants like dust and moisture—common around excavator engines—and draw power directly from the machine’s robust hydraulic system for seamless integration.

Q2: How does the A2FM motor handle the variable cooling needs of an excavator?
A2: While the A2FM is a fixed-displacement motor, its output speed is intelligently controlled by the machine’s hydraulic system. A dedicated fan pump or proportional valve adjusts oil flow to the motor, allowing it to spin faster when coolant temperature rises and slower when less cooling is needed, ensuring optimal engine temperature at all times.

Q3: What makes the A2FM specifically “anti-explosion” or safe for harsh environments?
A3: The term denotes its exceptional durability against internal pressure spikes and external hazards. Its heavy-duty housing contains potential internal failures, and its advanced seals prevent ingress of explosive mixtures of dust and air. This robust design prevents the motor from being an ignition source in volatile atmospheres.

Q4: Our fleet has a failed fan motor with Cat part number 242-4042-02. Can you supply a direct replacement?
A4: Yes. We specialize in providing high-quality, cross-compatible hydraulic motor solutions for Caterpillar equipment. For an exact replacement quote and technical verification for part 242-4042-02 or any other code, please contact our support team via www.baolilai-pump.com/contact_us/.

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Product Model

Product Model No.	Application Equipment Brands	Application Equipment No.
A A2F M	Caterpillar	O&KSH630
A2FM	Caterpillar	O&KSH630
A2FM	Caterpillar	O&KSH630
A2FM	Caterpillar	1772342
A2FM	Caterpillar	1772342
A2FM	Caterpillar	1731687
A2FM	Caterpillar	468-9841
A2FM	Caterpillar	O&KSH630
A2FM	Caterpillar	150-4933 RH340
A2FM	Caterpillar	2460059(16106534) Mining
A2FM	Caterpillar	246-0059 RH340A Engine Radiator Fan Motor
A2FM	Caterpillar	246-0059 RH340A Engine Radiator Fan Motor
A2FM	Caterpillar	3688052
A2FM	Caterpillar	3688052
A2FM	Caterpillar	152-7374-01
A2FM	Caterpillar	368-2782-01
A2FM	Caterpillar	658188
A2FM	Caterpillar	152-7371 EXCAVATOR M318;M318C;M318D;M320;M322C;M322D;
A2FM	Caterpillar	368-2783-01
AA2FM	Caterpillar	3552403-01
AA2FM	Caterpillar	355-2404-01 D11T
AA2FM	Caterpillar	202-9940-01 793D
AA2FM	Caterpillar	323-3618-00 D11T
AA2FM	Caterpillar	159-7161 TRACK-TYPETRACTOR:D11R;D9R
AA2FM	Caterpillar	214-1094
AA2FM	Caterpillar	178-6344-00
AA2FM	Caterpillar	159-7166-01(0R-9340) 990;990II;992G;992K;993K(hydraulic fan)
AA2FM	Caterpillar	160-0198-01 excavator:5130B;5230;5230B;
AA2FM	Caterpillar	296-7684-04 pipelayer PL61
AA2FM	Caterpillar	172-4843-02 PAVINGCOMPACTOR: CP-74;CS-573C;CS-573D;CS-583C;CS-583D;CS-583E;CS-74
AA2FM	Caterpillar	184-7436-02
AA2FM	Caterpillar	171-1881
AL A2F M	Caterpillar	1927275
AL A2F M	Caterpillar	224-4988 RH120C travel drive
AL A2F M	Caterpillar	242-4042-02
AL A2F M	Caterpillar	240-7790 OFF HIGH WAY TRUCK:793D;793F;795FAC;797F
AL A2F M	Caterpillar	226-6003-01 offhigh way truck:797F

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Specification