CASAPPA Hydraulic External Gear Pump KP30.51D

| Overview of CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27

CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27 is a KAPPA 30 multiple pump — the double-pump variant of Casappa's cast-iron external gear range. Casappa builds the KAPPA range around a body and a mounting flange in cast iron of superior mechanical specification, and the KAPPA 30 is a solid, compact two-piece construction that allows several functions to be packed into a reduced space. Inside each section the external gear pair runs on sleeve bearings between pressure-balanced thrust plates, so the assembly stays rigid and keeps its volumetric efficiency as pressure rises and as the unit wears.

Its function in a circuit is to draw oil from the reservoir and convert drive-shaft rotation into pressurised flow — here twice over. The front section is a KP 30•51, rated 210 bar continuous, 230 bar system pressure and 250 bar peak, turning at 2,500 r/min; the rear section is a KP 30•27, rated 270 bar continuous, 290 bar system pressure and 310 bar peak. Both sections share the shaft line and are stacked on the drive-shaft end first, the section with the greater power requirement at the front and the smaller behind it. This unit carries the SAE "B" two-hole mounting flange (code K9), the SAE "B" 13-tooth spline drive shaft (code A8) and SAE flanged J518 side ports — inlet ME, outlet MC. The same range can be ordered with European, SAE and ISO mounting flanges, nine drive-shaft options and threaded, split-flange or flanged ports, so one pump family covers a wide spread of existing installations.

Because the sections are driven through the first shaft and through an internal connecting shaft, the pressure each section may be run at is bounded by the torque those shafts can transmit — see Techspecs.

| Dimension of CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27

Reference dimensions for the KP 30•51 front section and the KP 30•27 rear section, side ports. The letters correspond to the dimensional drawing.

Interface data needed with the drawing:

| Pump Installation Specifications CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27

A KAPPA 30 multiple pump is not written as one string but as one section after another, separated by a slash: the section before the separator is the front section — the one at the drive-shaft end — and the section after it is the rear section. Each section carries the same field set, and a field that is left unwritten takes its standard value.

Code structure — KAPPA 30 multiple pumps, same groups:

Position 5 lists the port pair in IN/OUT order for pumps and in OUT/IN order for motors — which is why the same flange appears as ME/MC on a pump and as MC/ME on a motor.

| Reading your code: KP30.51-A8K9-LME/MC-KSL/GS/30.27

| Assembly rules for KAPPA 30 multiple pumps

• In applications where the input power requirement of each section varies, the section with the greater requirement must be at the drive-shaft end, and progressively smaller to the rear.

• Features and performance are the same as the corresponding single pumps, but pressures must be limited by the transmissible torque of the drive and connecting shafts.

• The maximum rotational speed is that of the lowest-rated single unit incorporated — here 2,500 r/min, the rating of the KP 30•51 front section.

• The torque absorbed from the shaft of the first pump results from the sum of the torques due to all sections, and must not exceed the maximum torque limit given for the shaft of the first pump.

• For multiple pumps with more than two sections a bracket is recommended.

Techspecs

Performance

Interfaces and configuration

Operating conditions

Advantages

Two pumps, one drive point

51.83 cm³/rev and 26.7 cm³/rev stacked on one shaft line give 78.53 cm³/rev and 196.3 l/min at 2,500 r/min, so a single take-off drives two circuits — for example a main working circuit plus steering, pilot or cooling — with one mounting flange and one coupling.

Cast-iron body and mounting flange

The KAPPA range is built around a body and a mounting flange in cast iron of superior mechanical specification, and the rigidity of that assembly is what holds reliability and high volumetric efficiency at high operating pressures.

High operating pressures

210 bar continuous, 230 bar system pressure and 250 bar peak at the front section; 270 / 290 / 310 bar at the rear section. The pressure each section may actually run at is bounded by the torque the drive and connecting shafts can transmit, which for this string is 280 Nm at the A8 drive shaft and 170 Nm at the standard connecting shaft.

Solid, compact construction

The KAPPA 30 packs several functions into a reduced space — which is the point of a multiple pump: two circuits inside one pump envelope instead of two separate pumps.

Low noise emission

The external gear design keeps running noise low, which is a requirement on fan drives, municipal machinery and equipment working close to the operator.

Exceptional working life expectancy

Pressure-balanced thrust plates compensate for wear, so each section keeps its flow as the unit ages.

High efficiency at high temperature

As the circuit oil heats up and the film thins, the cast-iron structure limits the loss of volumetric efficiency — the property Casappa specifies the KAPPA range for.

SAE standard interface

The K9 two-hole flange conforms to SAE J744, the A8 drive shaft is an SAE J498B 13-tooth involute spline, and the ME/MC ports are SAE J518 flanged ports taking standard split-flange fittings.

Wide combination choice

European, SAE and ISO mounting flanges, nine drive shafts, four port positions and threaded, split-flange or flanged ports let the same pump family be matched to an existing driveline, mounting and pipework.

Common-inlet option available

The same construction can be ordered with a common inlet body (code M5) when both sections should draw from one suction line.

6. Reference of CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27

6.1 The KP 30 range — same series, all displacements

Every size below is a valid position 1 in the KAPPA 30 ordering code, as a single pump or as a section of a multiple pump. Pressures are the ratings for unidirectional pumps with side ports and the CSC / CSL Standard body design; reversible pumps are limited to a maximum of 250 bar, except the sizes whose rated value is lower.

Any two sizes in this table can be combined into a KAPPA 30 double pump on the same groups, with the larger section at the drive-shaft end. The matching gear-motor range is KM 30, with the same displacements.

6.2 Complete order numbers identified on the market

Complete KAPPA 30 multiple-pump order numbers of the KP 30 range. Reference only — each number is valid only in the exact configuration it describes.

Official Casappa order examples for KAPPA 30 multiple-pump assemblies, for reference:

7. Brand Replacement

HENGYUHANG supplies a replacement for the CASAPPA KAPPA 30 gear pump series, including KP30.51-A8K9-LME/MC-KSL/GS/30.27 and the rest of the KP 30 size range from KP 30•22 to KP 30•73, in single-pump and multiple-pump form. The replacement is built to the same group 3 dimensional envelope and the same international standard interfaces — European, SAE and ISO mounting flanges, the same drive-shaft families, and threaded, split-flange or flanged ports — so a machine originally fitted with a Casappa KAPPA 30 pump can be returned to service without modifying the driveline, the mounting or the pipework.

Because a multiple pump is built section by section, the section order, the drive and connecting shafts and the torque limits decide what a replacement may be run at. Replacement units are supplied to Casappa's published interface and dimension data for the KAPPA 30 group, and fitment is decided by the ordering code of the original pump — please quote the complete original order number when enquiring.

8. Applications of CASAPPA KP30.51-A8K9-LME/MC-KSL/GS/30.27

Typical applications of the KAPPA 30 gear pump family, in single and multiple-pump form:

Building and construction — supply pump on compact machines, excavators and loaders, roller and drum drives, auxiliary circuits

Material handling — lifting, tilting and positioning circuits on handling equipment, cranes and aerial platforms

Forestry — feed, conveyor, saw and attachment drives on forestry machinery

Fan drive — engine cooling fan drives and hydraulic fan circuits

Agriculture — supply and implement circuits on tractors, balers, harvesters, sprayers and seeders

Industrial hydraulics — presses, mixers, machine tools and plastic injection moulding machines

Special vehicles — municipal vehicles, cleaning vehicles and truck-mounted equipment

In these machines a multiple pump feeds two loads at once — typically a working circuit that runs continuously at moderate circuit pressure plus a second service such as steering, pilot, lubrication or cooling. The cast-iron body, the sleeve-bearing gear pairs and the pressure-balanced thrust plates are what let the assembly keep its volumetric efficiency as circuit pressure and oil temperature rise.

9. Package & Shipping

10. Why Choose Hengyuhang?

A hydraulic specialist, not a general trader. Quanzhou Hengyuhang Power Technology Co., Ltd. is based in Fujian, China and manufactures hydraulic gear pumps and motors, synchronous motors, multiple pump units, pumps with built-in valves and custom valve blocks.

One-piece minimum order. MOQ is one unit, so a single machine can be put back into service without committing to a production batch.

Model-level checking before you order. Send the complete original order number — for this page, the full KP30.51-A8K9-…/30.27 string — and every section, the drive and connecting shafts, the flange and the ports are run against the KAPPA 30 data before the unit is built.

Multiple-pump capability. As a builder of multiple pump units, we assemble the sections, check the torque the drive and connecting shafts will see, and match the section order required by the application.

In-house production and testing. CNC machining centres, automatic gear heat-treatment lines, single-piece-flow assembly and an automatic hydraulic test bench, with ERP/MES traceability through production.

Replacement coverage across the range. The same plant supplies replacement units for a wide list of hydraulic brands and models, which keeps a mixed machine fleet on one supplier.

Customization support. OEM, ODM and OBM are offered, and customized packaging, graphics, nameplate and logo are available for distributor orders.

One-year warranty. Every unit is covered by a one-year warranty.

Responsive after-sales. Online support for installation and application questions.