CASAPPA Replacements
CASAPPA Cast iron External Gear Pump KP20.16
CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D is a KAPPA 20 cast-iron external gear double pump: two gear sections running on one drive shaft inside a single cast-iron body-and-mounting-flange assembly. The front section is KP 20•16 with a geometric displacement of 16.85 cm³/rev (1.03 in³/rev); the rear section is KP 20•14 with 14.53 cm³/rev (0.89 in³/rev), giving 31.38 cm³/rev (1.92 in³/rev) in total and up to 94.1 l/min of combined theoretical flow at 3,000 r/min. Both sections work on the side of the unit through gas straight-thread (BSPP) ports — inlet GE, G 3/4 tapped 22 mm deep, and outlet GD, G 1/2 tapped 20 mm deep. The unit turns clockwise (D) looking at the drive shaft and runs from 350 to 3,000 r/min, with each section rated 260 bar (3,770 psi) for KP 20•16 and 265 bar (3,843 psi) for KP 20•14 continuous, 290 bar (4,205 psi) intermittent and 320 bar (4,640 psi) peak. Working pressure of the assembly is set by the transmissible torque of the drive shaft and of the connecting shaft between the two sections, so the pump delivers two independent flows from one mounting, one drive coupling and one pipework set — fewer hoses, fewer brackets and a shorter driveline than two separate pumps, in the solid, compact two-piece cast-iron construction the KAPPA range is specified for.
| CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D Applications
Two sections on one shaft let a single pump feed two separate circuits with different flow demands, which is why the unit is specified where a machine needs a working function and a steering or auxiliary function at the same time. It is used on building and construction equipment, material handling machinery, forestry machines and fan drives, and across the wider KAPPA application range on agricultural implements, cranes, winches, mixers, presses and machine tools — converting drive-shaft rotation into pressurised flow for cylinders, motors and valve blocks, and holding that flow under sustained load, high duty cycles and demanding ambient conditions. Gas straight-thread ports take standard BSPP fittings, and the European standard mounting and 1:8 tapered drive shaft let the unit be fitted to existing machinery without modifying the driveline, the mounting or the pipework.
3. Key parameters
Product Model: KP20.16-LGE/GD/20.14-LGE/GD D
Brand Replacement: CASAPPA OEM or as requested.
Displacement: front section 16.85 cm³/rev (1.03 in³/rev) + rear section 14.53 cm³/rev (0.89 in³/rev) — 31.38 cm³/rev (1.92 in³/rev) in total
Rotation Direction: clockwise (D)
Peak Pressure: 320 bar (4,640 psi) per section; the working pressure of the assembly is limited by the transmissible torque of the drive shaft — 140 Nm (1,239 lbf in) — and of the connecting shaft between the sections — 110 Nm (974 lbf in) per stage
Min./max. speed (350 / 3,000 r/min), the per-section continuous and intermittent pressure ratings, the port and screw torques and the full operating-condition limits are listed in Techspecs below.
| Overview of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D is a KAPPA 20 external gear double pump. Casappa builds the KAPPA range around a body and a mounting flange in cast iron of superior mechanical specification, and the KAPPA 20 is the group 2 size of that range — a solid, compact two-piece construction that packs several functions into a reduced space. Inside, each section carries an external gear pair 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.
The two sections are stacked on a common drive shaft: the front section KP 20•16 is the one at the drive-shaft end, and the smaller KP 20•14 section follows at the rear, so the section with the greater power requirement drives directly from the shaft, as the multiple-pump design requires. Each section has its own inlet and outlet: gas straight-thread ports on the side of the unit, inlet GE (G 3/4 × 22 mm deep) and outlet GD (G 1/2 × 20 mm deep). The rated performance of each section is that of the corresponding single pump — 260 bar continuous, 290 bar intermittent and 320 bar peak for KP 20•16; 265 / 290 / 320 bar for KP 20•14 — while the pressure the assembly may actually work at is limited by the torque the drive and connecting shafts can transmit.
Its function in a circuit is to draw oil from the reservoir and convert drive-shaft rotation into two pressurised flows at the same time. With 16.85 + 14.53 cm³/rev, the assembly moves 94.1 l/min in total at its 3,000 r/min maximum speed, and both outlet flows scale with shaft speed, so one pump covers two circuits without a second driveline, a second mounting bracket or a second set of hoses.
| Dimension of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
[Drawing placeholder — insert the dimensional drawing screenshot here]
Reference dimensions for the KAPPA 20 multiple-pump construction with side ports. Ref. A and Ref. B are the two envelope dimensions Casappa publishes for each KP 20 displacement in the European-standard 82 E2 pump; read each value off the matching letter on the dimensional drawing.
| Item | Front section KP 20•16 | Rear section KP 20•14 |
|---|---|---|
| Ref. A — as published for this displacement | 105.5 mm (4.154 in) | 100 mm (3.937 in) |
| Ref. B — as published for this displacement | 72.5 mm (2.854 in) | 67 mm (2.638 in) |
| Inlet port | GE — G 3/4, 22 mm (0.866 in) deep | GE — G 3/4, 22 mm (0.866 in) deep |
| Outlet port | GD — G 1/2, 20 mm (0.787 in) deep | GD — G 1/2, 20 mm (0.787 in) deep |
| Ports position | L — side | L — side |
The overall length of a multiple pump is the sum of the individual section dimensions of the dimensional drawing. For triple units the published rule is A+B+C+B+C+D; a double pump uses the same rule with the intermediate section omitted. Overall length, weight and the finished envelope are confirmed against the order configuration before shipment.
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Mounting flange | European standard 82 E2 — cast iron |
| Drive shaft | European tapered 1:8 (shaft code 82) — maximum transmissible torque 140 Nm (1,239 lbf in) |
| Connecting shaft between the two sections | maximum transmissible torque 110 Nm (974 lbf in) per stage |
| Ports position | L — inlet and outlet on the side |
| Ports IN / OUT | Gas straight thread, BSPP to UNI-ISO 228 — inlet GE, outlet GD, on both sections |
| Inlet port thread | G 3/4, 22 mm (0.866 in) deep |
| Outlet port thread | G 1/2, 20 mm (0.787 in) deep |
| Seals | Buna N (NBR) — standard, no code |
| Body clamp screw tightening torque | 70 ±7 Nm (558 ÷ 682 lbf in) |
| Port tightening torque — GE | 30 +2.5 Nm (266 ÷ 288 lbf in) low-pressure side · 90 +5 Nm (797 ÷ 841 lbf in) high-pressure side |
| Port tightening torque — GD | 20 +1 Nm (177 ÷ 186 lbf in) low-pressure side · 50 +2.5 Nm (443 ÷ 465 lbf in) high-pressure side |
The port torques differ between the two sides of the unit. For reversible rotation only the high-pressure-side torque applies.
| Pump Installation Specifications CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
The Casappa KAPPA 20 multiple-pump ordering code builds the assembly section by section: the front pump carries its own ports position and ports IN/OUT, each following section carries its own, and the rotation and the seal set close the string. Two design rules govern the assembly — the section with the greater power requirement must be at the drive-shaft end, with progressively smaller sections to the rear; and, for a double pump, the intermediate section is omitted.
Code structure — published example: KP20•4-LGD/GD/20•4-LGD/GD S/FS
| Field | Meaning | Options in the KAPPA 20 range |
|---|---|---|
| Front pump type | displacement of the section at the drive-shaft end | KP 20•4 / •6,3 / •8 / •11,2 / •14 / •16 / •20 / •25 / •31,5 |
| Front pump drive shaft + mounting flange (written only when a specific combination is ordered) | shaft code + flange code | 03 SAE "A" spline 9 T · 01 SAE spline 10 T · 07 SAE spline 11 T · 04 SAE "B" spline 13 T · 31 SAE "A" straight · 49 straight · 50 straight · 32 SAE "B" straight, with S1 SAE "A" 2 holes · S2 SAE "A" 2 holes with O-ring seal · S5 SAE "B" 2 holes (S5 only with the 04 and 32 shafts); European standard 82 E2 when the field is not written |
| Front pump ports position | inlet and outlet position of the front section | L side / P rear (rear ports on the last section only) |
| Front pump ports IN/OUT | port type and size of the front section | gas straight thread BSPP GE/GD for KP 20•14 … •31,5 and GD/GD below · SAE straight thread ODT OC/OC … OD/OC · SAE split flange SSM MA/MA … MC/MB |
| Rear pump type | displacement of the rear section | 20•4 / 20•6,3 / 20•8 / 20•11,2 / 20•14 / 20•16 / 20•20 / 20•25 / 20•31,5 — the drive shaft and mounting flange are not repeated on the rear section |
| Rear pump ports position + IN/OUT | same codes as the front section | L side / P rear · GE/GD · GD/GD · ODT · SSM |
| Rotation | direction of rotation of the whole assembly, looking at the drive shaft | D clockwise / S anti-clockwise |
| Seals | one seal set for the whole assembly | Buna N (NBR) — standard, no code · N-H Buna N with high back-pressure shaft seals · V Viton · N Bz Buna N with bronze thrust plates · V Bz Viton with bronze thrust plates |
| Reading your code: KP20.16-LGE/GD/20.14-LGE/GD D
| Field | Code | Meaning |
|---|---|---|
| Front pump type | KP 20•16 | 16.85 cm³/rev (1.03 in³/rev) |
| Front pump ports position | L | inlet and outlet on the side |
| Front pump ports IN/OUT | GE/GD | inlet GE (G 3/4, 22 mm deep), outlet GD (G 1/2, 20 mm deep) |
| Rear pump type | 20•14 | 14.53 cm³/rev (0.89 in³/rev) |
| Rear pump ports position | L | inlet and outlet on the side |
| Rear pump ports IN/OUT | GE/GD | inlet GE (G 3/4, 22 mm deep), outlet GD (G 1/2, 20 mm deep) |
| Rotation | D | clockwise, looking at the drive shaft |
| Seals | not written | Buna N (NBR) — standard, no code |
The drive-shaft and mounting-flange fields are not written in this string, in line with Casappa's own published double-pump example for the European-standard family. When a specific shaft and flange combination is ordered it is written into the front section, for example KP20.25-04S5-LGE/GD/20.16-LGE/GD S/FS — SAE "B" spline 13 T (04) with the SAE "B" 2-hole flange (S5).
| Assembly rules that apply to this unit:
Section order. The section with the greater power requirement sits at the drive-shaft end, progressively smaller to the rear — which is how this assembly is built, KP 20•16 in front and KP 20•14 behind it.
Speed. The maximum rotational speed of the assembly is the lowest rated speed of the single units incorporated, so this double pump stops at 3,000 r/min, set by the KP 20•16 section (KP 20•14 alone would run to 3,500 r/min). At the bottom of the range the assembly is bounded by the more demanding section, so the 350 r/min minimum of KP 20•14 applies even though the KP 20•16 section alone is rated down to 300 r/min.
Pressure. Both sections keep the pressure ratings of the corresponding single pumps, but the working pressure of the assembly must be limited by the transmissible torque of the drive shaft — 140 Nm (1,239 lbf in) for the European tapered 1:8 shaft code 82 — and of the connecting shaft between KAPPA 20 sections, which transmits up to 110 Nm (974 lbf in) per stage.
Absorbed torque. The torque drawn from the front shaft is the sum of the torques of both stages. Using the published formula Mtheor. = Δp (bar) × V (cm³/rev) ÷ 62.83 with ηhm ≈ 0.90: at 250 bar the KP 20•16 section absorbs 74.5 Nm (659 lbf in) and at 200 bar the KP 20•14 section absorbs 51.4 Nm (455 lbf in), so the front shaft carries 125.9 Nm (1,114 lbf in) — inside the 140 Nm (1,239 lbf in) rating of the shaft, with each stage inside the 110 Nm (974 lbf in) connecting-shaft limit.
4. Techspecs of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
Performance
| Parameter | Value |
| Type | KAPPA 20 cast-iron external gear double pump — KP 20•16 front section + KP 20•14 rear section |
| Displacement, front section | 16.85 cm³/rev (1.03 in³/rev) |
| Displacement, rear section | 14.53 cm³/rev (0.89 in³/rev) |
| Total displacement | 31.38 cm³/rev (1.92 in³/rev) |
| Continuous operating pressure p1 | front section 260 bar (3,770 psi) · rear section 265 bar (3,843 psi) |
| Intermittent pressure p2 (relief valve setting) | 290 bar (4,205 psi) — both sections |
| Peak pressure p3 | 320 bar (4,640 psi) — both sections |
| Working pressure of the assembly | limited by the transmissible torque of the drive shaft (140 Nm / 1,239 lbf in) and of the connecting shaft between sections (110 Nm / 974 lbf in per stage) |
| Max. speed | 3,000 r/min — the lowest rated speed of the two sections (KP 20•16) |
| Min. speed | 350 r/min — the more demanding of the two sections (KP 20•14); the KP 20•16 section alone is rated down to 300 r/min |
| Theoretical flow at 3,000 r/min | front 50.55 l/min · rear 43.59 l/min · total 94.1 l/min (displacement × speed ÷ 1,000) |
| Theoretical flow at 1,500 r/min | front 25.3 l/min · rear 21.8 l/min · total 47.1 l/min |
| Efficiency | calculated from the design formulas Q = Qtheor. × ηv, M = Mtheor. ÷ ηhm, ηt = ηv × ηhm, with ηv ≈ 0.98, ηhm ≈ 0.90 and ηt ≈ 0.88; performance curves are published for each displacement |
| Reversible version | max. pressures 15% lower than the values shown; only the high-pressure-side port torque applies |
Interfaces and configuration
| Parameter | Value |
| Rotation | D — clockwise, looking at the drive shaft |
| Mounting flange | European standard 82 E2 |
| Drive shaft | European tapered 1:8 (shaft code 82), max. transmissible torque 140 Nm (1,239 lbf in) |
| Connecting shaft | KAPPA 20 + KAPPA 20, max. transmissible torque 110 Nm (974 lbf in) per stage |
| Ports position | L — inlet and outlet on the side, on both sections |
| Ports IN / OUT | Gas straight thread BSPP to UNI-ISO 228 — inlet GE, outlet GD |
| Inlet port thread | G 3/4, 22 mm (0.866 in) deep |
| Outlet port thread | G 1/2, 20 mm (0.787 in) deep |
| Seals | Buna N (NBR) — standard |
| Construction | Two-piece cast-iron construction: body and mounting flange in cast iron, external gear pair on sleeve bearings, pressure-balanced thrust plates; two sections on a common drive shaft |
| Body clamp screw tightening torque | 70 ±7 Nm (558 ÷ 682 lbf in) |
| Port tightening torque — GE | 30 +2.5 Nm (266 ÷ 288 lbf in) low-pressure side · 90 +5 Nm (797 ÷ 841 lbf in) high-pressure side |
| Port tightening torque — GD | 20 +1 Nm (177 ÷ 186 lbf in) low-pressure side · 50 +2.5 Nm (443 ÷ 465 lbf in) high-pressure side |
Operating conditions
| Parameter | Value |
| Fluid | Mineral-oil-based hydraulic fluid to ISO/DIN; fire-resistant fluids on request (specify the fluid type when ordering) |
| Inlet pressure range (pump) | 0.7 ÷ 3 bar abs. (10 ÷ 44 psi) |
| Viscosity — recommended | 12 to 100 mm²/s (cSt) [60 to 456 SSU] |
| Fluid temperature, N seals | −25 °C to 80 °C continuous (−13 °F to 176 °F); 100 °C (212 °F) max. peak |
| Fluid temperature, N-H seals | −25 °C to 110 °C continuous (−13 °F to 230 °F) |
| Fluid temperature, V seals | −25 °C to 110 °C continuous (−13 °F to 230 °F); 125 °C (257 °F) max. peak |
| HFA — oil-in-water emulsion (5 ÷ 15 % oil) | max. 50 bar (725 psi), max. 1,500 r/min, 2 °C to 55 °C (36 °F to 131 °F), 125 °C (257 °F) peak — V seals |
| HFB — water-in-oil emulsion (40 % water) | max. 120 bar (1,740 psi), max. 1,500 r/min, 2 °C to 60 °C (36 °F to 140 °F) — N seals |
| HFC — water-glycol | max. 100 bar (1,450 psi), max. 1,500 r/min, −20 °C to 60 °C (−4 °F to 140 °F) — N Bz seals |
| HFD — phosphate ester | max. 150 bar (2,175 psi), max. 1,500 r/min, −10 °C to 80 °C (14 °F to 176 °F) — V Bz seals |
| Recommended contamination, Δp < 140 bar (2,030 psi) | NAS 1638 class 10 / ISO 4406 21/19/16, with a 10 μm filter element |
| Recommended contamination, 140 ÷ 210 bar (2,030 ÷ 3,045 psi) | NAS 1638 class 9 / ISO 4406 20/18/15, with a 10 μm filter element |
| Recommended contamination, Δp > 210 bar (3,045 psi) | NAS 1638 class 8 / ISO 4406 19/17/14, with a 10 μm filter element |
Dimensions — see section 2.
5. Advantages of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
Two independent flows from one pump. The KP 20•16 and KP 20•14 sections work on a common drive shaft, so 16.85 + 14.53 cm³/rev — 94.1 l/min in total at 3,000 r/min — is delivered to two circuits from one mounting, one drive coupling and one pipework set.
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. Up to 260 / 265 bar continuous, 290 bar intermittent and 320 bar peak per section, with the assembly limited only by the torque the drive and connecting shafts can transmit.
Direct drive to the loaded section. The larger KP 20•16 section is placed at the drive-shaft end and the smaller KP 20•14 behind it, which is the arrangement the multiple-pump design calls for and the one that keeps the connecting shaft inside its 110 Nm limit.
Solid, compact two-piece construction. Two functions are stacked into a reduced envelope, which matters where the pump has to fit inside an existing housing or a tight driveline.
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.
Standard threaded interface. The G 3/4 and G 1/2 gas straight-thread ports take standard BSPP fittings, and the European standard flange and 1:8 tapered drive shaft match the mounting and the coupling European mobile machinery is already built for.
Wide combination choice across the family. More than 20 size pairings can be ordered between KP 20•4 and KP 20•31,5, with European or SAE mounting flanges, nine drive shafts, side or rear port positions and threaded, split-flange or flange-port connections.
Suited where fluids and size are critical. KAPPA is the range Casappa positions for applications where noise, contamination, non-flammable fluids and envelope size are the deciding factors.
6. Reference of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
6.1 The KP 20 range — same series, all displacements
Every size below is a valid first field of the KAPPA 20 pump ordering code, and any two of them can be paired as the sections of a double pump. Pressures are the ratings for unidirectional pumps with side ports; reversible pumps are limited to a maximum 15 % lower than the values shown.
| Pump type | Displacement | p1 | p2 | p3 | Max. speed | Min. speed |
| KP 20•4 | 4.95 cm³/rev (0.30 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 4,000 r/min | 350 r/min |
| KP 20•6,3 | 6.61 cm³/rev (0.40 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 4,000 r/min | 350 r/min |
| KP 20•8 | 8.26 cm³/rev (0.50 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 3,500 r/min | 350 r/min |
| KP 20•11,2 | 11.23 cm³/rev (0.69 in³/rev) | 275 bar (3,988 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,500 r/min | 350 r/min |
| KP 20•14 | 14.53 cm³/rev (0.89 in³/rev) | 265 bar (3,843 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,500 r/min | 350 r/min |
| KP 20•16 | 16.85 cm³/rev (1.03 in³/rev) | 260 bar (3,770 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,000 r/min | 300 r/min |
| KP 20•20 | 21.14 cm³/rev (1.29 in³/rev) | 210 bar (3,045 psi) | 230 bar (3,335 psi) | 250 bar (3,625 psi) | 3,000 r/min | 300 r/min |
| KP 20•25 | 26.42 cm³/rev (1.61 in³/rev) | 180 bar (2,610 psi) | 200 bar (2,900 psi) | 220 bar (3,190 psi) | 2,500 r/min | 300 r/min |
| KP 20•31,5 | 33.03 cm³/rev (2.01 in³/rev) | 140 bar (2,030 psi) | 160 bar (2,320 psi) | 180 bar (2,610 psi) | 2,000 r/min | 300 r/min |
The matching gear-motor range is KM 20, with the same displacements — the two sizes are alternative entries of the same ordering code.
6.2 Complete order numbers identified on the market
Complete KAPPA 20 double-pump order numbers from the KP 20 range. Reference only — each number is valid only in the exact configuration it describes.
KP20.6,3/20.4 D/FS KP20.6,3/20.6,3 D/FS KP20.8/20.4 D/FS KP20.8/20.6,3 D/FS KP20.8/20.8 D/FS KP20.11,2/20.4 D/FS KP20.11,2/20.6,3 D/FS KP20.11,2/20.8 D/FS KP20.11,2/20.11,2 D/FS KP20.11,2-03S1/20.11,2 D/FS KP20.14/20.4 S/FS KP20.14/20.6,3 D/FS KP20.14/20.6,3 S/FS KP20.14/20.8 D/FS KP20.14/20.14 D/FS KP20.14-LGE/GD/20.14-LGE/GD D/FS KP20.16/20.4 D/FS KP20.16/20.8 D/FS KP20.16/20.11,2 D/FS KP20.16-03S1/20.14 D/FS KP20.16-LGE/GD/20.14-LGE/GD D KP20.16/20.16 D/FS KP20.16/20.16 S/FS KP20.20/20.4 D/FS KP20.20/20.6,3 D/FS KP20.20/20.8 D/FS KP20.20/20.14 D/FS KP20.20/20.16 D/FS KP20.20/20.20 D/FS KP20.20/20.20 S/FS KP20.25-04S5-LGE/GD/20.16-LGE/GD S/FS KP20.25/20.4 D/FS KP20.25/20.11,
CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D Gear Pump
External gear pump · KAPPA 20 series · double-pump · group 2
Brand Replacement
HENGYUHANG supplies a replacement for the CASAPPA KAPPA 20 gear pump series, including KP20.16-LGE/GD/20.14-LGE/GD D and the rest of the KP 20 range from KP 20•4 to KP 20•31,5 in single, double and triple pump form. The replacement is built to the same group 2 dimensional envelope and the same international standard interfaces — European and SAE mounting flanges, the same drive-shaft families, and threaded, split-flange or flange-port connections — so a machine originally fitted with a Casappa KAPPA 20 pump can be returned to service without modifying the driveline, the mounting or the pipework.
Replacement units are supplied to Casappa's published interface and dimension data for the KAPPA 20 group. The ordering code of the original pump is the reference used to confirm fitment, so please quote the complete original order number when enquiring.
Applications
Typical applications of the KAPPA 20 double-pump family:
Building and construction — supply pump on compact machines, mini excavators and skid steer loaders, roller and drum drives, combined work and steering circuits
Material handling — lifting, tilting and positioning circuits on handling equipment, cranes and aerial platforms, with a separate auxiliary flow for attachments
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, and dual-circuit steering and lift installations
Industrial hydraulics — presses, mixers, machine tools and plastic injection moulding machines needing two flows from one drive
Special vehicles — municipal vehicles, cleaning vehicles and truck-mounted equipment
In these machines the pump feeds two loads that run continuously at moderate circuit pressure, and is expected to hold flow under sustained load, high duty cycles and demanding ambient conditions. The cast-iron body, the sleeve-bearing gear pairs and the pressure-balanced thrust plates are what let the unit keep its volumetric efficiency as circuit pressure and oil temperature rise.
Package & Shipping
| Item | Specification |
|---|---|
| Packaging | Single unit, wooden box / export-grade packing |
| Selling unit | Single item — MOQ 1 unit |
| Net weight | Approx. 11 kg for the KAPPA 20 group 2+2 double-pump configuration (see Techspecs) |
| Gross weight and package size | Confirmed per order, according to the shaft, flange and ports selected |
| Lead time | Confirmed per order, according to configuration and quantity |
| Shipping | Air, sea or express, quoted to destination |
| Customization | Customized packaging, nameplate and logo available for volume orders |
| Warranty | 1 year |
Packing, MOQ and warranty terms follow the supplier's standard export terms for hydraulic gear units; weights and lead times are confirmed against the ordered configuration before shipment.
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 verification before you order. Send the complete original order number — for this page, the full KP20.16-LGE/GD/20.14-LGE/GD D string — and the configuration is checked against Casappa's KAPPA 20 dimension, flange, shaft and port data, including the section order and the connecting-shaft torque limit, 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.
Company and supplier terms as published by HENGYUHANG at the time of preparation.
Techspecs of CASAPPA KP20.16-LGE/GD/20.14-LGE/GD D
Performance
| Parameter | Value |
| Type | KAPPA 20 cast-iron external gear double pump — KP 20•16 front section + KP 20•14 rear section |
| Displacement, front section | 16.85 cm³/rev (1.03 in³/rev) |
| Displacement, rear section | 14.53 cm³/rev (0.89 in³/rev) |
| Total displacement | 31.38 cm³/rev (1.92 in³/rev) |
| Continuous operating pressure p1 | front section 260 bar (3,770 psi) · rear section 265 bar (3,843 psi) |
| Intermittent pressure p2 (relief valve setting) | 290 bar (4,205 psi) — both sections |
| Peak pressure p3 | 320 bar (4,640 psi) — both sections |
| Working pressure of the assembly | limited by the transmissible torque of the drive shaft (140 Nm / 1,239 lbf in) and of the connecting shaft between sections (110 Nm / 974 lbf in per stage) |
| Max. speed | 3,000 r/min — the lowest rated speed of the two sections (KP 20•16) |
| Min. speed | 350 r/min — the more demanding of the two sections (KP 20•14); the KP 20•16 section alone is rated down to 300 r/min |
| Theoretical flow at 3,000 r/min | front 50.55 l/min · rear 43.59 l/min · total 94.1 l/min (displacement × speed ÷ 1,000) |
| Theoretical flow at 1,500 r/min | front 25.3 l/min · rear 21.8 l/min · total 47.1 l/min |
| Efficiency | calculated from the design formulas Q = Qtheor. × ηv, M = Mtheor. ÷ ηhm, ηt = ηv × ηhm, with ηv ≈ 0.98, ηhm ≈ 0.90 and ηt ≈ 0.88; performance curves are published for each displacement |
| Reversible version | max. pressures 15% lower than the values shown; only the high-pressure-side port torque applies |
Interfaces and configuration
| Parameter | Value |
| Rotation | D — clockwise, looking at the drive shaft |
| Mounting flange | European standard 82 E2 |
| Drive shaft | European tapered 1:8 (shaft code 82), max. transmissible torque 140 Nm (1,239 lbf in) |
| Connecting shaft | KAPPA 20 + KAPPA 20, max. transmissible torque 110 Nm (974 lbf in) per stage |
| Ports position | L — inlet and outlet on the side, on both sections |
| Ports IN / OUT | Gas straight thread BSPP to UNI-ISO 228 — inlet GE, outlet GD |
| Inlet port thread | G 3/4, 22 mm (0.866 in) deep |
| Outlet port thread | G 1/2, 20 mm (0.787 in) deep |
| Seals | Buna N (NBR) — standard |
| Construction | Two-piece cast-iron construction: body and mounting flange in cast iron, external gear pair on sleeve bearings, pressure-balanced thrust plates; two sections on a common drive shaft |
| Body clamp screw tightening torque | 70 ±7 Nm (558 ÷ 682 lbf in) |
| Port tightening torque — GE | 30 +2.5 Nm (266 ÷ 288 lbf in) low-pressure side · 90 +5 Nm (797 ÷ 841 lbf in) high-pressure side |
| Port tightening torque — GD | 20 +1 Nm (177 ÷ 186 lbf in) low-pressure side · 50 +2.5 Nm (443 ÷ 465 lbf in) high-pressure side |
Operating conditions
| Parameter | Value |
| Fluid | Mineral-oil-based hydraulic fluid to ISO/DIN; fire-resistant fluids on request (specify the fluid type when ordering) |
| Inlet pressure range (pump) | 0.7 ÷ 3 bar abs. (10 ÷ 44 psi) |
| Viscosity — recommended | 12 to 100 mm²/s (cSt) [60 to 456 SSU] |
| Fluid temperature, N seals | −25 °C to 80 °C continuous (−13 °F to 176 °F); 100 °C (212 °F) max. peak |
| Fluid temperature, N-H seals | −25 °C to 110 °C continuous (−13 °F to 230 °F) |
| Fluid temperature, V seals | −25 °C to 110 °C continuous (−13 °F to 230 °F); 125 °C (257 °F) max. peak |
| HFA — oil-in-water emulsion (5 ÷ 15 % oil) | max. 50 bar (725 psi), max. 1,500 r/min, 2 °C to 55 °C (36 °F to 131 °F), 125 °C (257 °F) peak — V seals |
| HFB — water-in-oil emulsion (40 % water) | max. 120 bar (1,740 psi), max. 1,500 r/min, 2 °C to 60 °C (36 °F to 140 °F) — N seals |
| HFC — water-glycol | max. 100 bar (1,450 psi), max. 1,500 r/min, −20 °C to 60 °C (−4 °F to 140 °F) — N Bz seals |
| HFD — phosphate ester | max. 150 bar (2,175 psi), max. 1,500 r/min, −10 °C to 80 °C (14 °F to 176 °F) — V Bz seals |
| Recommended contamination, Δp < 140 bar (2,030 psi) | NAS 1638 class 10 / ISO 4406 21/19/16, with a 10 μm filter element |
| Recommended contamination, 140 ÷ 210 bar (2,030 ÷ 3,045 psi) | NAS 1638 class 9 / ISO 4406 20/18/15, with a 10 μm filter element |
| Recommended contamination, Δp > 210 bar (3,045 psi) | NAS 1638 class 8 / ISO 4406 19/17/14, with a 10 μm filter element |
| The KP 20 range — same series, all displacements
Every size below is a valid first field of the KAPPA 20 pump ordering code, and any two of them can be paired as the sections of a double pump. Pressures are the ratings for unidirectional pumps with side ports; reversible pumps are limited to a maximum 15 % lower than the values shown.
| Pump type | Displacement | p1 | p2 | p3 | Max. speed | Min. speed |
|---|---|---|---|---|---|---|
| KP 20•4 | 4.95 cm³/rev (0.30 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 4,000 r/min | 350 r/min |
| KP 20•6,3 | 6.61 cm³/rev (0.40 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 4,000 r/min | 350 r/min |
| KP 20•8 | 8.26 cm³/rev (0.50 in³/rev) | 285 bar (4,133 psi) | 300 bar (4,350 psi) | 330 bar (4,785 psi) | 3,500 r/min | 350 r/min |
| KP 20•11,2 | 11.23 cm³/rev (0.69 in³/rev) | 275 bar (3,988 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,500 r/min | 350 r/min |
| KP 20•14 | 14.53 cm³/rev (0.89 in³/rev) | 265 bar (3,843 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,500 r/min | 350 r/min |
| KP 20•16 | 16.85 cm³/rev (1.03 in³/rev) | 260 bar (3,770 psi) | 290 bar (4,205 psi) | 320 bar (4,640 psi) | 3,000 r/min | 300 r/min |
| KP 20•20 | 21.14 cm³/rev (1.29 in³/rev) | 210 bar (3,045 psi) | 230 bar (3,335 psi) | 250 bar (3,625 psi) | 3,000 r/min | 300 r/min |
| KP 20•25 | 26.42 cm³/rev (1.61 in³/rev) | 180 bar (2,610 psi) | 200 bar (2,900 psi) | 220 bar (3,190 psi) | 2,500 r/min | 300 r/min |
| KP 20•31,5 | 33.03 cm³/rev (2.01 in³/rev) | 140 bar (2,030 psi) | 160 bar (2,320 psi) | 180 bar (2,610 psi) | 2,000 r/min | 300 r/min |
The matching gear-motor range is KM 20, with the same displacements — the two sizes are alternative entries of the same ordering code.
KP20.6,3/20.4 D/FS
KP20.6,3/20.6,3 D/FS
KP20.8/20.4 D/FS
KP20.8/20.6,3 D/FS
KP20.8/20.8 D/FS
KP20.11,2/20.4 D/FS
KP20.11,2/20.6,3 D/FS
KP20.11,2/20.8 D/FS
KP20.11,2/20.11,2 D/FS
KP20.11,2-03S1/20.11,2 D/FS
KP20.14/20.4 S/FS
KP20.14/20.6,3 D/FS
KP20.14/20.6,3 S/FS
KP20.14/20.8 D/FS
KP20.14/20.14 D/FS
KP20.14-LGE/GD/20.14-LGE/GD D/FS
KP20.16/20.4 D/FS
KP20.16/20.8 D/FS
KP20.16/20.11,2 D/FS
KP20.16-03S1/20.14 D/FS
KP20.16-LGE/GD/20.14-LGE/GD D
KP20.16/20.16 D/FS
KP20.16/20.16 S/FS
KP20.20/20.4 D/FS
KP20.20/20.6,3 D/FS
KP20.20/20.8 D/FS
KP20.20/20.14 D/FS
KP20.20/20.16 D/FS
KP20.20/20.20 D/FS
KP20.20/20.20 S/FS
KP20.25-04S5-LGE/GD/20.16-LGE/GD S/FS
KP20.25/20.4 D/FS
KP20.25/20.11,2 D/FS
KP20.25/20.14 D/FS
KP20.25/20.16 D/FS
KP20.25/20.16 S/FS
KP20.25/20.20 D/FS
KP20.25/20.25 S/FS
KP20.31,5/20.4 D/FS
KP20.31,5/20.8 D/FS
KP20.6,3/20.6,3 D/FS
KP20.8/20.4 D/FS
KP20.8/20.6,3 D/FS
KP20.8/20.8 D/FS
KP20.11,2/20.4 D/FS
KP20.11,2/20.6,3 D/FS
KP20.11,2/20.8 D/FS
KP20.11,2/20.11,2 D/FS
KP20.11,2-03S1/20.11,2 D/FS
KP20.14/20.4 S/FS
KP20.14/20.6,3 D/FS
KP20.14/20.6,3 S/FS
KP20.14/20.8 D/FS
KP20.14/20.14 D/FS
KP20.14-LGE/GD/20.14-LGE/GD D/FS
KP20.16/20.4 D/FS
KP20.16/20.8 D/FS
KP20.16/20.11,2 D/FS
KP20.16-03S1/20.14 D/FS
KP20.16-LGE/GD/20.14-LGE/GD D
KP20.16/20.16 D/FS
KP20.16/20.16 S/FS
KP20.20/20.4 D/FS
KP20.20/20.6,3 D/FS
KP20.20/20.8 D/FS
KP20.20/20.14 D/FS
KP20.20/20.16 D/FS
KP20.20/20.20 D/FS
KP20.20/20.20 S/FS
KP20.25-04S5-LGE/GD/20.16-LGE/GD S/FS
KP20.25/20.4 D/FS
KP20.25/20.11,2 D/FS
KP20.25/20.14 D/FS
KP20.25/20.16 D/FS
KP20.25/20.16 S/FS
KP20.25/20.20 D/FS
KP20.25/20.25 S/FS
KP20.31,5/20.4 D/FS
KP20.31,5/20.8 D/FS
| Published Casappa order examples for multiple-pump assemblies, for reference:
KP20•4-LGD/GD/20•4-LGD/GD S/FS
KP20•4-LGD/GD/20•4-LGD/GD/20•4-LGD/GD S/FS
KP20•4-LGD/GD/20•4-LGD/GD/20•4-LGD/GD S/FS
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