KP30.34 KP30.61 Hydraulic Double Gear Pump For Concrete Pump Truck 3339111608 24102207095.3

Wuhan Xinlaifu Hydraulic Equipment Co., Ltd. is one of the leading manufacturers and suppliers of kp30.34 kp30.61 hydraulic double gear pump for concrete pump truck 3339111608 24102207095.3 in China. With abundant experience, we warmly welcome you to buy high quality customized products at competitive price from our factory. Also, OEM&ODM service is available.

 

Parameter	KP30.34	KP30.61
Displacement	34.56 cm³/rev (2.11 in³/rev)	61.26 cm³/rev (3.74 in³/rev)
Max Continuous Pressure	260 bar (3770 psi)	200 bar (2900 psi)
Max Peak Pressure	285 bar (4134 psi)	~220 bar
Max Speed	3000 rpm	3000 rpm
Min Speed	350 rpm	350 rpm
Body Material	Aluminum	Aluminum

Casappa KP30 Series Double Gear Pump – KP30.34 & KP30.61 for Concrete Pump Trucks

If you operate or maintain a concrete pump truck, you know that hydraulic pump failure is not a gradual event. The pump stops delivering flow, the main cylinder stalls, and the boom freezes in position - with a full pipeline of concrete that must be cleaned out immediately. The cost is not just the pump; it is the delayed pour, the wasted concrete, and the crew standing idle.

The Casappa KP30 Series is a double gear pump platform widely used on concrete pump trucks from Putzmeister, SANY, and Zoomlion. Two specific displacements dominate this application: the KP30.34 (34.56 cm³/rev) and the KP30.61 (61.26 cm³/rev). These two pumps are typically combined as a tandem unit - sharing a single drive shaft and cast iron housing - with one pump serving the high-pressure main cylinder circuit and the other serving the high-flow auxiliary functions.

What makes the KP30 series suited to concrete pumping?

The pump uses a three-piece cast iron structure with pressure balance plates and sintered bronze side plates. As the gears wear, the pressure balance system automatically compensates for axial clearance - maintaining volumetric efficiency over thousands of operating hours. For concrete pump trucks that run under continuous high pressure with frequent pressure spikes, this self-compensating design is not a luxury; it is a reliability requirement.

Which KP30 configuration do you need? That depends on two questions:

What is your pump's displacement combination? → KP30.34 + KP30.61 is the most common tandem pairing for concrete pump trucks

What is your machine's OEM part number? → 3339111608 and 24102207095.3 are two reference numbers associated with this application (see OEM Cross Reference section for important distinctions)

2.1 Tandem Configuration – Two Pumps, One Drive Shaft

The KP30.34 and KP30.61 are most commonly used as a tandem (double) pump in concrete pump truck applications. This means two independent gear pump sections share a single drive shaft and mounting interface.

Why this matters for concrete pump design:

Compact installation - two hydraulic circuits powered from one PTO or gearbox output

Simplified driveline - one coupling, one mounting flange, one alignment procedure

Independent circuits - the main cylinder circuit (high pressure) and the auxiliary circuit (boom, outrigger, water pump) operate without interference

Typical tandem configuration on a concrete pump truck:

KP30.61 section - drives the main concrete cylinder circuit, delivering high flow to move the concrete pistons through the delivery pipeline

KP30.34 section - drives the boom and outrigger functions, where lower flow but higher pressure is required for precise positioning under load

How to confirm your tandem configuration: Check the model code on your original pump. A tandem KP30 pump will have two displacement figures separated by a plus sign or slash (e.g., KP30.61+34). If your machine uses a single pump, confirm the displacement before ordering.

2.2 Displacement Selection – KP30.34 vs KP30.61

The two displacements serve different roles in the concrete pump hydraulic system. Selecting the right combination is the first decision.

Selection guidance:

If you are replacing a single pump on a smaller concrete pump or auxiliary system, confirm which function it serves - boom circuit or main cylinder circuit - and match the displacement accordingly.

If you are replacing a tandem pump, confirm both displacements from the original nameplate. A common configuration is KP30.61 (main cylinder) + KP30.34 (boom/auxiliary).

Do not assume the two displacements are interchangeable. The KP30.34 operates at higher pressure (300 bar vs 260 bar) but lower flow. The KP30.61 delivers more flow but at lower pressure. Matching the pump to the circuit function is essential for system performance.

2.3 Pressure Capability – Built for the Concrete Pump Duty Cycle

Concrete pumping is one of the most demanding mobile hydraulic applications. The main cylinder must push concrete through hundreds of meters of pipeline, often with repeated pressure spikes as the concrete slugs move through bends and reducers.

What this means in practice: The KP30.34's 300 bar continuous rating provides margin for pressure spikes during boom operation - when the operator extends the boom with a full pipeline of concrete, the load on the boom cylinder rises sharply. The KP30.61's 260 bar rating is matched to the main cylinder circuit, where flow volume is the primary requirement and system pressure is limited by the concrete delivery pressure.

2.4 Cast Iron Construction – Durability Where It Counts

The KP30 series uses cast iron for the front and rear covers and the central body - not aluminum. For concrete pump trucks that operate in dusty, high-vibration environments with continuous pressure cycling, cast iron offers:

Higher burst pressure resistance - critical for the main cylinder circuit

Better vibration damping - reduces gear noise and housing fatigue

Longer service life - resists the mechanical stress of repeated pressure spikes

Thermal stability - less distortion under the temperature swings of concrete pumping

Front flange configuration: KP30 pumps are available with European standard 4-hole flange (pilot 50.8 mm) or SAE B 2-hole flange (pilot 101.6 mm), with shaft options including conical 1:8 with key and SAE B spline (21.8 mm diameter, 13 teeth) . Confirm your existing flange and shaft type before ordering.

2.5 Pressure Balance Plates – Efficiency That Lasts

The KP30 series incorporates pressure balance plates behind the sintered bronze side plates. As the gears rotate, hydraulic pressure acts on the back of the side plates, pushing them against the gear faces to maintain a tight seal.

What this means for your maintenance budget: Unlike a fixed-clearance pump where efficiency drops as the gears wear, the KP30's pressure balance system automatically compensates for wear. The pump maintains high volumetric efficiency over its service life, reducing the need for premature replacement and keeping your concrete pump operating at rated output.

2.6 Practical Selection Guide – Matching the Pump to Your Concrete Pump Truck

Use this table to identify the correct KP30 configuration for your machine:

 A2VK Series Axial Piston Metering Pump (Polyurethane High Pressure Variable Pump) A2VK series is a high-precision axial piston variable metering pump, specially designed for polyurethane foaming machinery, used for precise proportional delivery of polyol and isocyanate. Equipped with integrated handwheel with precision scale, stepless adjustment of displacement. Double shaft seal structure with buffer fluid port, suitable for chemical medium, low pulsation, high volumetric efficiency, stable metering performance. Widely used in PU high-pressure foaming injection system, chemical proportioning metering system.

A2VK □ □ □ □ □ - S02

1. Size:12/28/55/107
2. Control: MA = Manual handwheel adjustment
3. Rotation: R=Clockwise, L=Counter-clockwise
4. Seal / Material: G=Standard seal for PU medium
5. Port: P=SAE threaded port

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