Parker PGP640 PGM640 Series Hydraulic Gear Pump/Motor Replacement

Displacemnet	30.0 to 80.0 cm³/rev
Max. Pressure	Continuous up to 275 bar(4000 psi)
Max. Speed	Up to 3,300 RPM
Volumetric Efficiency	Up to 98%
Material	High-strength extruded aluminum
Interchangeability	100% Drop-in replacement for Parker
Mounting Options	SAE,ISO, European Standard
Shaft Types	Splined, Tapered, and Straight Keyed available
Configurations	Single, Tandem (Double), or Triple units
Applications	Excavators, Forklifts, and Industrial Power Units

Our PGP640/PGM640 series gear pump and motor offers a robust, factory-direct alternative to original Parker units, covering a versatile displacement range from 30 cm³/rev to 80 cm³/rev. Built with a high-duty cast iron body and an advanced interlocking structure, these units sustain continuous pressures up to 275 bar (4000 psi) with zero housing expansion. Featuring precision-ground forged steel gears and pressure-balanced plates, the 640 series ensures maximum volumetric efficiency, low noise, and OEM-level durability for heavy-duty construction and industrial machinery.

PGP640 PGM640 Standard Displacement Single Unit:

Pump Displacement	Code	0300	0350	0450	0550	0650	0750	0800
	cc/rev	30	35	45	55	65	75	80
	in³/rev	1.83	2.14	2.75	3.36	3.97	4.58	4.88
Continuous Pressure	bar	275	275	275	275	275	235	210
Continuous Pressure	psi	3989	3989	3989	3989	3843	3408	3118
Intermittent Pressure	bar	300	300	300	300	300	260	240
Intermittent Pressure	psi	4351	4351	4351	4351	4206	3771	3481
Port Location “X”	mm	128.6	128.6	131	135.6	138.4	142.2	142.2
Port Location “X”	inch	5.06	5.07	5.15	5.34	5.45	5.6	5.6
Overall Length “Y”	mm	176	176	183	189	196	203	203
Overall Length “Y”	inch	6.93	6.93	7.19	7.45	7.71	7.99	7.99
*Weight	kg	20.6	20.6	21.2	22	22.6	23.3	24
*Weight	lb	42.2	45.4	46.7	48.5	49.8	51.4	53

PGP640 PGM640 Standard Displacement Tandem Unit:

Pump Displacement	code	0300	0350	0450	0550	0650	0750	0800
	cc/rev	30	35	45	55	65	75	80
	in³/rev	1.83	2.14	2.75	3.36	3.97	4.58	4.88
Front Port Location “X1”	mm	128.6	128.6	131.8	135.6	138.4	142.2	142.2
Front Port Location “X1”	inch	5.06	5.06	5.19	5.34	5.45	5.6	5.6
Rear Port Location “X2”	mm	44.5	44.5	47.9	50.7	54.5	58	58
Rear Port Location “X2”	inch	1.75	1.75	1.89	2	2.15	2.28	2.28
Front Overall Length “Y”	mm	173.1	173.1	179.7	186.3	192.9	200.2	200.2
Front Overall Length “Y”	inch	6.81	6.81	7.07	7.33	7.59	7.88	7.88
Rear Overall Length “Y”	mm	150.9	150.9	157.5	164.1	170.7	178	178
Rear Overall Length “Y”	inch	5.94	5.94	6.2	6.46	6.72	7.01	7.01
*Weight Front Section	kg	20.3	20.3	20.9	21.7	22.3	23	23
*Weight Front Section	lb	44.8	44.8	46.1	47.8	49.2	50.7	50.7
*Weight Rear Section	kg	19.3	19.3	19.9	20.7	21.3	22	22
*Weight Rear Section	lb	42.5	42.5	43.9	45.6	47	48.5	48.5

PGP640 Typical Outlet Flow and Input Power 120°F(50℃),ISO VG32 Fluid
Speed (rpm)	Units	Displacement/Maximum Allowable Continuous Pressure
	cc	30	35	45	55	65	75	80
	in³	1.83	2.26	2.75	3.36	3.97	4.58	4.88
	bar	275	275	275	275	265	225	210
	psi	3989	3989	3989	3989	3843	3263	3046
900	lpm	25.5	31.5	38.3	46.8	55.3	63.8	68
	gpm	6.7	8.3	10.1	12.4	14.6	16.9	18
	kw	13.3	16.4	20	24.4	27.8	27.2	27.1
	hp	17.8	22	26.8	32.7	37.3	36.5	36.3
1200	lpm	34.2	42	51	62.4	73.7	85.1	90.7
	gpm	9	11.1	13.5	16.5	19.5	22.5	24
	kw	17.7	21.9	26.6	32.5	37	36.3	36.1
	hp	23.8	29.3	35.7	43.6	49.7	48.7	48.4
1500	lpm	43	53	64.5	78.8	93.1	107.4	114.6
	gpm	11.4	14	17	20.8	24.6	28.4	30.3
	kw	22.4	27.6	33.6	41.1	46.8	45.9	45.7
	hp	30.1	37.1	45.1	55.1	62.8	61.5	61.2
1800	lpm	51.8	63.9	77.8	95	112.3	129.6	138.2
	gpm	13.7	16.9	20.5	25.1	29.7	34.2	36.5
	kw	26.9	33.2	40.4	49.3	56.2	55	54.8
	hp	36.1	44.5	54.1	66.1	75.3	73.8	73.5
2100	lpm	60.8	75	91.2	111.5	131.7	152	162.1
	gpm	16.1	19.8	24.1	29.4	34.8	40.2	42.8
	kw	31.7	39.1	47.6	58.2	66.3	64.9	64.6
	hp	42.6	52.5	63.8	78	88.8	87	86.7
2400	lpm	69.8	86.1	104.8	128	151.3	174.6	186.2
	gpm	18.4	22.8	27.7	33.8	40	46.1	49.2
	kw	36.7	45.2	55	67.2	76.6	75	74.7
	hp	49.2	60.6	73.8	90.1	102.7	100.6	100.1
2700	lpm	78.6	96.9	117.9	144	170.2	196.4	209.5
	gpm	20.8	25.6	31.1	38.1	45	51.9	55.3
	kw	41.7	51.4	62.6	76.5	87.1	85.3	84.9
	hp	55.9	69	83.9	102.6	116.8	114.4	113.9
3000	lpm	87.3	107.7	131	160.1	189.2	218.3	232.8
	gpm	23.1	28.4	34.6	42.3	50	57.7	61.5
	kw	46.9	57.8	70.3	85.9	97.9	95.9	95.5
	hp	62.9	77.5	94.3	115.2	131.2	128.6	128

Our Parker-compatible PGP640 gear pumps and PGM640 gear motors are designed for heavy-duty mobile and industrial hydraulic systems. With high-pressure capability and flexible configurations, they provide reliable performance and direct replacement fit for your equipment.

Customization Item	Available Options	Description
Unit Type	PGP (Pump) / PGM (Motor)	Hydraulic gear pump or motor for your system
Displacement	30 – 80 cm³/rev	Determines oil flow rate for machinery
Shaft Style	Keyed / Splined (SAE standard sizes)	Connection type to match your engine or machine
Rotation	Clockwise (CW) / Counterclockwise (CCW)	Rotation direction for installation fit
Mounting	SAE B / SAE C 2‑bolt / 4‑bolt	Standard heavy-duty mounting patterns
Port Type & Position	Side / Rear ports	Inlet/outlet positions and thread types
Port Type & Position	SAE / BSPP / Metric / O‑ring	Inlet/outlet positions and thread types
Seal Material	NBR (Standard) / FKM (High Temp)	For standard or high-temperature fluids
Configuration	Single / Tandem / Multiple sections	Single pump or multi-pump assembly
Pressure Rating	Continuous up to 275 bar (4000 psi)	High-pressure performance for heavy use

Contact us with your displacement, shaft, port, mounting and rotation requirements for a quick quotation. We supply high-quality PGP640 / PGM640 replacements with OEM-comparable quality, stable performance and fast delivery.

For heavy-duty hydraulic applications, stability and durability are non-negotiable. Our PGP640/PGM640 series Gear Pumps and Motors are manufactured under strict ISO-certified processes to ensure they match the rigorous performance of original Parker units.

1. Heavy-Duty Structural Integrity

The PGP640/PGM640 series features a high-strength aluminum body with a specialized interlocking design. This structure is specifically engineered to prevent casing expansion and maintain internal clearances even under continuous high-pressure cycles up to 275 bar (4000 psi).

2. Precision-Ground Forged Steel Gears

We use premium forged steel for our gear sets, which undergo precision grinding and heat treatment. This ensures:

Superior Gear Mesh: Reducing friction and heat during large-displacement operations (30-80 cm³/rev).
Low Noise Levels: Optimized gear geometry minimizes vibration, extending the life of the entire hydraulic system.

3. Advanced Sealing & Efficiency

Equipped with pressure-balanced wear plates and high-temperature resistant seals, our pumps maintain maximum volumetric efficiency. This design compensates for thermal expansion, ensuring consistent flow rates and preventing internal leakage in harsh environments.

4. 100% Full-Load Performance Testing

Every PGP640 unit is tested on our advanced hydraulic test benches. We simulate real-world heavy-duty conditions to verify:

Flow Accuracy at maximum RPM.
Pressure Sustainability at peak loads.
Shaft Torque & Seal Integrity.

5. 12-Month Industrial Warranty

We provide a one-year comprehensive warranty and full technical support. Our engineers can assist with cross-referencing Parker part numbers (e.g., PGP640A0300 to PGP640A0800) to ensure a perfect “drop-in” fit for your machinery.

Hydraulic Gear Pump – FAQ

What is the displacement and pressure rating for the PGP640 series?

Our PGP/PGM640 series covers a displacement range from 30 cm³/rev to 80 cm³/rev. These heavy-duty gear pumps are designed to operate at continuous pressures up to 275 bar (4000 psi), making them ideal for high-demand hydraulic systems in construction and mining.

Is the PGP640 aluminum body strong enough for high-pressure 30-80cc applications?

Absolutely. We use high-duty aluminum alloy combined with an advanced interlocking body design. This structure significantly increases the unit’s rigidness and resistance to pressure spikes, preventing housing expansion and maintaining high volumetric efficiency even at 80cc peak flow.

Can these pumps directly replace Parker PGP640 and PGM640 units?

Yes, they are 100% interchangeable. We manufacture these units to the exact dimensional standards of the original Parker PGP/PGM640 series. The mounting flanges (such as SAE B or C), shaft ends (splined or keyed), and porting are a perfect match for a seamless “drop-in” installation.

How do you control noise and vibration in these large-displacement pumps?

We utilize precision-ground forged steel gears and optimized internal geometry. By reducing the pressure ripples and ensuring a perfect gear mesh, our PGP640 series operates with significantly lower noise and vibration compared to standard aftermarket alternatives, even at maximum RPM.

Do you provide a warranty for PGP640 pumps used in heavy machinery?

Yes. We offer a 12-month comprehensive warranty on all PGP640/PGM640 series gear pumps and motors. As a factory-direct supplier, we also provide technical support to help you cross-reference specific Parker part numbers (e.g., PGP640A0300 to PGP640A0800) to ensure the correct fit.

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