CASAPPA Hydraulic Gear pump KP40.121S0

| Overview of CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC

CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC is a KAPPA 40 external gear pump. Casappa builds the KAPPA 40 as gear pumps and motors made of cast iron in two pieces — a rigid and compact structure that makes it possible to incorporate a number of functions in a limited space. Inside, 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. In the standard CSC body design, the 121.80 cm³/rev gear set is rated 210 bar constant operating pressure, 230 bar system pressure and 250 bar peak, and turns between 300 and 2,500 r/min.

Its function in a circuit is to draw oil from the reservoir and convert drive-shaft rotation into pressurised flow. This unit carries the SAE "C" mounting flange (code S8), the SAE "C" straight drive shaft made for that flange (code 34) and side-positioned SAE four-bolt split-flange ports (position L) — inlet MF, 51 mm nominal, outlet ME, 39.3 mm nominal — so the pipework leaves the pump at the side of the body. Position 2 carries the letter S: the rotation is anti-clockwise looking at the drive shaft, and position 3 is written out as 0, the version without outboard bearing, for applications with no radial or axial load on the shaft. The 34 shaft and the S8 flange are the standard combination of the range in version 0, so this is the plain SAE "C" interface rather than a special build. The same range can be ordered with European and SAE mounting flanges, four drive-shaft options, two port positions and threaded, split-flange or flanged ports, so one pump family covers a wide spread of existing installations.

Three details of the code are worth reading closely on this size. The 121.80 cm³/rev displacement is the largest of the KAPPA 40 range that is still rated 210 bar constant operating pressure — the sizes above it step down to 200 bar and 190 bar, and the sizes below it are rated 220 bar and higher, so this pump sits at the top of the 210 bar class with 304.5 l/min of flow. The 34 drive shaft is the straight SAE "C" shaft, not the splined 06: it couples through a keyed hub and carries a maximum torque of 600 Nm (5,311 lbf in), which leaves headroom over the 507 Nm the pump absorbs at its system pressure. And MF/ME is the port pair the range publishes for the 87–151 sizes — a 51 mm inlet against a 39.3 mm outlet, with the larger port always on the suction side.

| Dimension of CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC

Reference dimensions for the KP 40•121 single unit with side ports and the CSC body design. The letters correspond to the dimensional drawing.

Interface data needed with the drawing:

| Pump Installation Specifications CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC

The Casappa KAPPA 40 ordering code is a 12-position string: each position selects one characteristic of the unit, and reading it is the fastest way to check that a pump will fit an existing installation. Positions 1 to 8 define the unit itself; positions 9 to 12 define the drain port, the shaft-seal option, the body design and the painting.

Code structure — KAPPA 40, single units:

Position 7 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 MF/ME on a pump and as ME/MF on a motor.

| Reading your code: KP40.121S0-34S8-LMF/ME-N-CSC

Two availability notes on this code. In version 0 the S8 flange is the standard combination with the 06 splined shaft and with the 34 straight shaft, and in version 6 it is the 40 shaft that is standard — so a 34 / S8 unit needs no special shaft or flange arrangement. And the MF/ME port pair belongs to the 87–151 sizes; the smaller 63–73 sizes of the range use the ME/MD pair instead.

Techspecs

Performance

Interfaces and configuration

Port data — SAE four-bolt flanged ports J518, standard pressure series 3000 psi (SSM), metric thread ISO 60° conforming to ISO/R 262

On this pump MF is the inlet and ME the outlet, so the inlet MF flange bolts take 30 +2.5 Nm (266 ÷ 288 lbf in) and the outlet ME flange bolts take 60 +5 Nm (531 ÷ 575 lbf in). For reversible rotation, only the tightening torque of the high-pressure side port is used.

Operating conditions

Advantages

Standard SAE "C" interface

The 34 drive shaft and the S8 mounting flange are the standard combination of the KAPPA 40 range in version 0, not a special build: the 2–4 hole SAE "C" flange and the SAE "C" straight shaft match the SAE mounting and coupling that heavy mobile machinery is already built for.

Straight shaft for keyed couplings

Code 34 is the parallel SAE "C" shaft rather than the 14-tooth spline, so the pump drives through a keyed hub; it is rated 600 Nm (5,311 lbf in) against the 507 Nm the pump absorbs at 230 bar, so the shaft keeps headroom at the top of the pressure range.

Top of the 210 bar class

121.80 cm³/rev is the largest displacement of the KAPPA 40 range that is still rated 210 bar constant operating pressure — KP 40•133 steps down to 200 bar and KP 40•151 to 190 bar — so this is the highest flow the family delivers on a 210 bar rating.

Heavy flow from one pump

304.5 l/min at 2,500 r/min, equivalent to about 110 kW of hydraulic power at the 230 bar system pressure, which lets a single pump replace a two-pump circuit.

Large split-flange ports sized for the flow

MF and ME are J518 3000 psi series flange ports — a 51 mm inlet against a 39.3 mm outlet — so the suction line is generously dimensioned for 304.5 l/min and the pipework couples through standard SAE flange halves and O-rings, giving a bolted, serviceable joint on both sides.

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 heavy operating pressures.

Compact version 0 body

Position 3 is 0, the version without outboard bearing, which is the shortest build of the range and the one to specify where the pump only sees torque and no radial or axial load on the shaft.

Rotation flexibility where the driveline is fixed

The unit is supplied anti-clockwise (S), and because it is a unidirectional pump the rotation can be reversed by turning the mounting flange 180° and re-tightening the clamp bolts to 100 ±15 Nm in a crisscross pattern — one part number covers either direction of drive.

Multiple-pump capability from the same front section

The KAPPA 40 code also covers double and triple pumps built on this front section with a common inlet port, so one drive point can feed a second and a third circuit without a second pump drive.

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 the pump 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.

6. Reference of CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC

6.1 The KP 40 range — same series, all displacements

Every size below is a valid position 1 in the KAPPA 40 pump ordering code. 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 (3,600 psi), except the sizes whose rated value is lower.

With p1 the constant operating pressure, p2 the system pressure (relief valve setting) and p3 the peak of pressure. The peak of pressure corresponds to the overshoot of the relief valve: both the relief valve setting and the overshoot must stay below their limits, and if the setting is compliant but the overshoot is higher than the limit, the setting must be decreased until the overshoot is compliant.

The same displacements are also built in the KAPPA 40 Plus range, which is written with the CSL body design and the PLUS suffix and runs a higher pressure class — 260 / 280 / 300 bar for KP 40•63 to KP 40•121 at up to 2,700 r/min — and adds the •100, •160 and •180 sizes that the standard KAPPA 40 does not offer. The matching gear-motor range is KM 40, with the same displacements from 61.43 cm³/rev to 150.99 cm³/rev: the pump and the motor are alternative position-1 entries of the same 12-position code.

6.2 Complete order numbers of the KP 40 range

Complete KAPPA 40 order numbers covering the KP 40 range from KP 40•63 to KP 40•151. Reference only — each number is valid only in the exact configuration it describes.

Order numbers for multiple-pump units assembled on the KP 40 front section:

Code examples in the KAPPA 40 code structure:

7. Brand Replacement

HENGYUHANG supplies a replacement for the CASAPPA KAPPA 40 gear pump series, including KP40.121S0-34S8-LMF/ME-N-CSC and the rest of the KP 40 size range from KP 40•63 to KP 40•151. The replacement is built to the same dimensional envelope and the same international standard interfaces — European and SAE mounting flanges, the same drive-shaft families, and threaded, split-flange or flanged ports — so a machine originally fitted with a Casappa KAPPA 40 pump can be returned to service without modifying the driveline, the mounting or the pipework.

Replacement units are supplied to the KAPPA 40 interface and dimension data. Fitment is decided by the ordering code of the original pump, so please quote the complete original order number when enquiring.

8. Applications of CASAPPA KP40.121S0-34S8-LMF/ME-N-CSC

Typical applications of the KAPPA 40 gear pump family:

Building and construction — supply pump on excavators, loaders, rollers and compact machines, and on auxiliary circuits that run continuously through the shift

Mining — main and auxiliary circuits on drilling rigs, crushers, conveyors and underground equipment

Material handling — lifting, tilting, clamping and positioning circuits on cranes, reach stackers and heavy handling attachments

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

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

Turf care and mowers — cutting, reel and traction circuits on wide-area mowers and turf equipment

Fan drive — engine cooling fan drives and hydraulic fan circuits

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

In these machines the pump feeds loads that run continuously at heavy circuit pressure, and is expected to hold flow under sustained load, high duty cycles and demanding ambient conditions. The 121.80 cm³/rev gear set delivers 304.5 l/min within a 210 bar rating, so it is the size to specify where a single pump has to move a large flow without the higher-pressure step of the smaller sizes — and the cast-iron body, the sleeve-bearing gear pair and the pressure-balanced thrust plates are what let the unit 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 KP40.121S0-… string — and the configuration is run against the KAPPA 40 dimension, flange, shaft and port data before the unit is built.

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.