CASAPPA Hydraulic Gear Pump PLP20/PLM20 Series

| Overview of CASAPPA PLP20.16D0-82E2-LEB/EA

CASAPPA PLP20.16D0-82E2-LEB/EA is a POLARIS 20 external gear pump. Casappa builds the POLARIS pumps and motors in three pieces: a body extruded in high-resistance aluminium alloy, an external gear pair running on sleeve bearings with pressure-balanced thrust plates, and a separate mounting flange and rear cover that can be supplied in aluminium or cast iron. That layout gives a high power-to-weight ratio and keeps the wear surfaces controllable independently of the housing. In the version-0 body the 16.85 cm³/rev gear set is rated 250 bar constant operating pressure, 280 bar system pressure and 300 bar peak, and turns between 500 and 3,000 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 European E2 four-bolt mounting flange, the European tapered 1:8 drive shaft (code 82) and side-positioned flanged ports (position L): the inlet is a four-bolt flange, code EB, with a 19 mm (0.75 in) port bore on a 40 mm (1.57 in) flange, and the outlet is a four-bolt flange, code EA, with a 13 mm (0.51 in) port bore on a 30 mm (1.18 in) flange. Position 2 carries the letter D: looking at the drive shaft the rotation is clockwise, and position 3 is written out as 0, the version without outboard bearing, for applications with no radial or axial load on the drive shaft. Positions 8 and 9 are not written, so the unit takes the standard choices of the code — Buna NBR seals and an all-cast-iron mounting flange and rear cover, the most rigid of the four cover combinations.

The port configuration is the part of the code that decides the pipework. Both ports leave the body at the side, and both are four-bolt flanges with metric ISO 60° threads to ISO/R 262: a 19 mm port on a 40 mm flange with M8 bolts on the suction side, matched with a 13 mm port on a 30 mm flange with M6 bolts at the outlet. The two flanges are drawn from the same European family, so one flange standard covers both lines on the machine, and the outlet flange is the smaller of the two, which keeps the pressure-line fitting compact at the pump. Reading across the range, 16.85 cm³/rev is the point where the POLARIS 20 still holds 250 bar continuous; from 19.09 cm³/rev upward the published rating drops to 200 bar, so this size is the last one in the group that carries the full pressure class at 3,000 r/min.

| Dimension of CASAPPA PLP20.16D0-82E2-LEB/EA

[Drawing placeholder — insert the dimensional drawing screenshot here]

Reference dimensions for the PLP 20•16 (16.85 cm³/rev) single unit. The letters correspond to the dimensional drawing.

| Side ports — position L

| Rear ports — position P

Interface data needed with the drawing:

| Pump Installation Specifications CASAPPA PLP20.16D0-82E2-LEB/EA

The Casappa POLARIS 20 ordering code is a 13-position string: each position selects one characteristic of the pump, and reading it is the fastest way to check that a pump will fit an existing installation. Positions 1 to 9 define the unit itself; positions 10 to 13 define the shaft seal, the drain port position and size, and the shaft arrangement.

Code structure — POLARIS 20, single units:

Position 7 is the only position where a pump and a motor of the same size are written differently: the port pair is listed IN/OUT on a pump and OUT/IN on a motor, which is why the same two flanges appear in the opposite order on the motor side of the range. The flange codes themselves are read by their first letter — a port code beginning with B is a German four-bolt flange, a code beginning with E is a European four-bolt flange, M is an SAE flange to the 3000 psi standard pressure series, S is an SAE flange to the SSS series, G is a GAS straight thread and O is a SAE straight thread.

| Reading your code: PLP20.16D0-82E2-LEB/EA

Two notes on this code. The 82 drive shaft — European tapered 1:8 — is the standard combination of the E2 flange face, so shaft and flange are the pairing Casappa publishes as the default for this interface, and there is no adapter in the coupling. And the two ports are written in the order IN/OUT: EB is the larger of the pair at 19 mm and goes on the suction side, EA is the smaller at 13 mm and goes on the pressure side, which means the pressure line on this unit is the compact end of the two.

Techspecs

Performance

Interfaces and configuration

Port data — flanged ports, four bolts, metric thread ISO 60° conforming to ISO/R 262

On this pump the inlet is the low-pressure side and the outlet the high-pressure side, and on this configuration both flanges are bolted to the same torque on either side — 15 +1 Nm (133 ÷ 142 lbf in) on the inlet and 8 +0.5 Nm (71 ÷ 75 lbf in) on the outlet. For reversible rotation, only the high-pressure-side torque is used.

Operating conditions

Advantages

The full 250 bar pressure rating at the largest displacement that carries it

Reading the POLARIS 20 pressure table size by size, 16.85 cm³/rev is rated 250 bar constant, 280 bar system and 300 bar peak; from PLP 20•19 upward the same range is published at 200 / 220 / 240 bar. So this is the last displacement in the group where the higher pressure class and a 3,000 r/min ceiling come together, and no larger displacement in the POLARIS 20 range offers a 300 bar peak.

3,000 r/min with 16.85 cm³/rev

The gear set holds the range's 3,000 r/min maximum, so flow reaches 50.55 l/min theoretical — 16.85 l/min for every 1,000 r/min of shaft speed — while the minimum speed stays down at 500 r/min, which gives a wide working band on a machine that has to idle slowly and still deliver at full speed.

The standard European shaft-and-flange pairing

Shaft 82 (European tapered 1:8) with mounting flange E2 is the combination Casappa publishes as the standard pairing in the E2 flange compatibility table, so the coupling, the flange face and the mounting bolt pattern are the group-2 European interface a machine is already built around — the unit drops in without an adapter on the drive line.

Clockwise rotation, declared at the code

Position 2 is D — clockwise looking at the drive shaft. On a single-rotation pump the direction of rotation must be the same as that of the drive shaft, so the rotation letter is the first thing to match when a pump is chosen for an existing driveline; S, R, L and B remain available in the same code if the machine turns the other way.

One flange family on both lines

The inlet (EB, 19 mm port on a 40 mm flange, M8) and the outlet (EA, 13 mm port on a 30 mm flange, M6) are both European four-bolt flanges with metric ISO 60° threads to ISO/R 262, so the machine needs one flange standard and one set of fittings rather than a mixed kit. The 19 mm suction bore gives headroom against suction losses at 50.55 l/min, and the compact 13 mm outlet keeps the pressure fitting small at the pump.

Three-piece construction

The extruded high-resistance aluminium alloy body, the sleeve-bearing gear set with pressure-balanced thrust plates, and the separate mounting flange and rear cover are produced and inspected as individual components, so the wear surfaces can be controlled independently of the housing.

The most rigid cover combination, as standard

Position 9 is not written, so the unit comes with a cast-iron mounting flange and a cast-iron rear cover — the stiffest of the four cover options and the one that holds the flange face and the thrust side in the same material. Aluminium flange, aluminium cover and mixed combinations can be ordered in the same position when weight matters more than rigidity.

High power-to-weight ratio

The aluminium-alloy body keeps the unit light while the gear set still carries 250 bar continuously, 280 bar system pressure and 300 bar peak.

Stable efficiency across the pressure range and across the working life

The POLARIS range is specified for consistent volumetric and hydro-mechanical efficiency, which keeps flow stable on a machine working at sustained load rather than at a test-bench point.

Low noise emission

The range is designed for a low level of noise, which matters on turf care, mower and fan-drive applications where the pump runs close to the operator.

Integrated outboard bearing option

The same series can be ordered in versions W8, 5, 6, 7 or 9 with an outboard bearing for duty cycles that put radial load on the drive shaft; version 0, this unit, is the choice when the shaft carries no radial or axial load.

Multiple-pump capability

POLARIS units are designed to be combined in standard version, with a common inlet and with separated stages, so one pump family can cover several circuits on the same machine.

Built-in valve options

The range can be ordered with priority, electric, max pressure relief, load sensing and check valves integrated into the pump, which removes external plumbing from the circuit.

Wide combination choice

European, SAE and German mounting flanges, sixteen drive shafts, two port positions and threaded, GAS-thread, SAE-straight-thread or flanged ports let the same pump be matched to an existing mounting and pipework.

6. Reference of CASAPPA PLP20.16D0-82E2-LEB/EA

6.1 The POLARIS 20 range — same series, all displacements

Every size below is a valid position 1 in the POLARIS 20 pump ordering code. With p1 the constant operating pressure, p2 the system pressure (relief valve setting) and p3 the peak of pressure. The values refer to side-port unidirectional pumps; for reversible pumps the maximum pressures are 250 bar (3,600 psi), except the sizes whose rated value is lower.

The matching motor range is PLM 20, with the same displacements — the pump and the motor are alternative position-1 entries of the same 13-position code. The same aluminium-body family also covers the POLARIS 10 group, from 1.07 to 10.67 cm³/rev, and the POLARIS 30 group, from 21.99 to 91.10 cm³/rev, with peak pressures up to 300 bar (4,350 psi) across the three groups.

6.2 Complete order numbers of the POLARIS 20 range

Complete POLARIS 20 order numbers covering the PLP 20 range. Reference only — each number is valid only in the exact configuration it describes.

Multiple-pump assemblies of the same range:

Code examples in the published POLARIS 20 code structure:

7. Brand Replacement

HENGYUHANG supplies a replacement for the CASAPPA POLARIS 20 gear pump series, including PLP20.16D0-82E2-LEB/EA and the rest of the PLP 20 / PLM 20 size range from PLP 20•4 to PLP 20•31,5. The replacement is built to the same group-2 dimensional envelope and the same international standard interfaces — European, SAE and German mounting flanges, the same drive-shaft families and the same threaded or flanged port options — so a machine originally fitted with a Casappa POLARIS 20 pump can be returned to service without modifying the driveline, the mounting or the pipework.

Replacement units are supplied to the POLARIS 20 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 PLP20.16D0-82E2-LEB/EA

Typical applications of the POLARIS 20 gear pump family:

Building and construction — supply and auxiliary circuits, steering, and lift and tilt functions on compact machines, excavators and loaders

Material handling — lift, clamp, tilt and positioning circuits on handling equipment, cranes and aerial platforms

Agriculture — implement hydraulics, steering and auxiliary circuits on tractors, balers, harvesters, sprayers and seeders

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

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

Fan drive — pump sections feeding hydraulic fan drive systems and engine cooling circuits

In these machines the pump typically feeds steering circuits, lift and tilt cylinders, auxiliary functions and drive circuits, and is expected to hold stable flow under sustained load, high duty cycles and demanding ambient conditions. The extruded aluminium-alloy 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, and the E2 mounting flange with the 82 European tapered shaft and the side-positioned flanged ports let it drop into a machine that is already built around group-2 interfaces.

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 PLP20.16D0-82E2-… string — and the configuration is run against the POLARIS 20 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.