CASAPPA Cast iron External Gear Pump KP30.51-A8K9-LME/MC-KSL/GS/30.27 is a high-performance, fixed-displacement external gear pump built to deliver high volumetric efficiency and stable hydraulic power under demanding industrial and mobile operating pressures. Its rugged two-piece cast iron housing and precision-machined gears ensure reliable flow, low noise and long service life even under continuous high-load operation.
This cast iron external gear pump is engineered for heavy-duty fluid transfer and hydraulic circuit pressurization across industrial machinery, agricultural equipment, construction machinery and mobile hydraulic systems. It reliably powers auxiliary functions, steering circuits, lifting mechanisms and drive systems operating under continuous high loads and severe environmental conditions.
Product Model: CASAPPA Cast iron External Gear Pump KP30.51-A8K9-LME/MC-KSL/GS/30.27
Brand Replacement: CASAPPA OEM or as requested.
Displacement: 51.83 cm³/rev (3.16 in³/rev)
Rotation Direction: clockwise (D), counter-clockwise (S), reversible (R)
Speed Range: Min. speed 500 r/min; Max. speed 2500 r/min
Peak Pressure: Peak pressure 330 bar (max. continuous 285 bar).
CASAPPA Cast Iron External Gear Pump KP30.51 is a heavy-duty, Group 3 external gear pump engineered with a rugged high-strength cast iron body and precision-machined gears to deliver high volumetric efficiency, smooth fluid delivery, and dependable continuous operation under demanding hydraulic pressure. Built to European standards, this fixed-displacement pump is designed for mobile and industrial hydraulic circuits that require robust performance, low noise, and a long service life. Its pressure-balanced construction and optimized porting convert mechanical power into hydraulic flow efficiently while withstanding thermal and mechanical stress in harsh working environments.

Note: Dimensional engineering drawings detailing port locations, shaft lengths, and flange bolt circles are available upon request for precise layout integration.
Mounting Interface: Standard SAE and European 4-bolt mounting flanges designed for secure, precise alignment on pumps, power take-offs, and hydraulic power units.
Drive Connection: Keyed parallel shaft and tapered shaft configurations engineered to accept flexible couplings with minimal radial load.
Port Orientation: Side-ported configuration with threaded or SAE split-flange connections to prevent leakage under peak pressure.
Alignment Tolerance: Maximum coaxial misalignment between the pump shaft and drive shaft kept within 0.05 mm to prevent premature bearing and seal wear.
| Technical Parameter | Specification |
|---|---|
| Product Model | CASAPPA Cast Iron External Gear Pump KP30.51-A8K9-LME/MC-KSL/GS/30.27 |
| Displacement | 51 cm³/rev |
| Pump Group | Group 3 |
| Rotation Direction | Clockwise (D) / Counter-clockwise (S) / Reversible (R) |
| Max Continuous Pressure | 285 bar |
| Max Intermittent Pressure | 300 bar |
| Max Peak Pressure | 330 bar |
| Max Speed | 4,000 r/min |
| Min Speed | 500 r/min |
| Housing Material | High-strength cast iron |
| Mounting Flange | SAE / European standard (4-bolt) |
| Port Connection | Threaded / SAE split flange |
| Shaft Type | Keyed parallel / tapered/Ext. Involute Spline |
| Working Fluid | Mineral hydraulic oil (HLP / HM) |
Exceptional durability provided by a high-strength cast iron housing that suppresses vibration and lowers noise emission.
High volumetric efficiency achieved through pressure-balanced side plates and automatic axial clearance compensation.
Flexible rotation options supporting clockwise (D), counter-clockwise (S), and reversible (R) requirements to match any circuit layout.
Proven contamination resistance and thermal stability thanks to hardened gears and specialized internal surface treatment.
KP30.51D0 — Clockwise rotation, 51 cm³/rev
KP30.51S0 — Counter-clockwise rotation, 51 cm³/rev
KP30.51R0 — Reversible rotation, 51 cm³/rev
KP30.51-A8K9-LME/MC-KSL/GS/30.27 — Full ordering code
HENGYUANG Cast Iron External Gear Pump KP30.51 is engineered as a direct drop-in replacement for the genuine CASAPPA KP30.51 cast iron external gear pump and its Group 3 equivalents, matching the original mounting footprint, port locations, shaft configuration, and performance curves exactly. It installs without any system modification and is fully interchangeable with KP30.51D0 (clockwise), KP30.51S0 (counter-clockwise), and KP30.51R0 (reversible) variants used across agricultural, construction, material-handling, and industrial hydraulic systems.
CASAPPA Cast Iron External Gear Pump KP30.51 is widely deployed across mobile and industrial hydraulic systems, including agricultural tractors and implements, construction and earth-moving machinery, forklifts and material-handling equipment, hydraulic power units, steering and auxiliary circuits, and industrial presses. Its Group 3 displacement makes it ideal for applications requiring steady, medium-to-high flow under sustained operating pressure.
Each pump is individually sealed in anti-corrosion VCI packaging, cushioned with custom-molded foam, and packed into reinforced export-grade plywood crates to prevent transit damage. We offer global air freight, ocean shipping, and express courier options with full shipment tracking and flexible delivery terms.

Hengyuhang Hydraulics combines decades of manufacturing expertise with rigorous quality control, ensuring every pump undergoes 100% factory pressure and performance testing before dispatch. We provide flexible OEM/ODM volume customization, responsive engineering support, and reliable supply chain solutions tailored to your market demands.
| Parameter | Specification |
|---|---|
| Model | KP30.51-A8K9-LME/MC-KSL/GS/30.27 |
| Series | CASAPPA KAPPA 30 Compact |
| Type | External gear pump |
| Displacement | 51.83 cm³/rev |
| Body type | Standard (CSC), cast iron |
| Continuous pressure (p1) | 210 bar |
| System pressure (p2) | 230 bar |
| Peak pressure (p3) | 250 bar |
| Max. speed | 2500 r/min |
| Min. speed | 350 r/min |
| Drive shaft | SAE "B" splined, 13 teeth (A8) |
| Mounting flange | SAE "B" 2-hole (K9) |
| Port position | Side ports (L) |
| Ports | SAE flanged ME 39.3 mm / MC 25.4 mm |
| Rotation direction | Clockwise (D), counter-clockwise (S), reversible (R/L/B) |
| Seals | Buna NBR (standard), Viton FKM (optional) |
| Hydraulic fluid | Mineral oil, ISO/DIN |
| Viscosity | 12–100 cSt (recommended), up to 750 cSt |
| Fluid temperature | −25 °C to +80 °C (NBR seals) |
| Feed pressure | 0.7 – 3 bar abs |
| Displacement (cm³/rev) | Pump Model | Motor Model | Pressure p1 / p2 / p3 (bar) | Max. Speed (r/min) | Min. Speed (r/min) |
|---|---|---|---|---|---|
| 21.99 | KP 30•22 | KM 30•22 | 270 / 290 / 310 | 3000 | 350 |
| 26.70 | KP 30•27 | KM 30•27 | 270 / 290 / 310 | 3000 | 350 |
| 30.63 | KP 30•31 | KM 30•31 | 250 / 270 / 290 | 3000 | 350 |
| 34.56 | KP 30•34 | KM 30•34 | 250 / 270 / 290 | 3000 | 350 |
| 39.27 | KP 30•38 | KM 30•38 | 250 / 270 / 290 | 3000 | 350 |
| 41.62 | KP 30•41 | KM 30•41 | 250 / 270 / 290 | 3000 | 350 |
| 43.98 | KP 30•43 | KM 30•43 | 230 / 250 / 270 | 3000 | 350 |
| 46.34 | KP 30•46 | KM 30•46 | 210 / 230 / 250 | 3000 | 350 |
| 51.83 | KP 30•51 | KM 30•51 | 210 / 230 / 250 | 2500 | 350 |
| 56.54 | KP 30•56 | KM 30•56 | 190 / 210 / 230 | 2500 | 350 |
| 61.26 | KP 30•61 | KM 30•61 | 180 / 200 / 220 | 2500 | 350 |
| 73.82 | KP 30•73 | KM 30•73 | 170 / 190 / 210 | 2500 | 350 |
No. 173, Xiacuo, Sihuang Village, Xiamei Town, Nan 'an City, Fujian Province