CASAPPA Replacements
CASAPPA Hydraulic Gear Pumps KP40.73S0
The HENGYUHANG 6PTF OEM Customized Series is a heavy-duty, high-pressure cast-iron external hydraulic gear pump engineered specifically as an exact-fit replacement for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC, with modular architectural coverage extending across the KAPPA KP40, KP35, and KP30 platforms. Tailored for specialized OEM equipment requiring 6PTF customized 6-bolt mounting flange interfaces, this pump resolves machinery obsolescence and non-standard mounting challenges without requiring modifications to engine bell housings, mounting brackets, or hydraulic plumbing. Featuring a nominal displacement of 73.40 cm³/rev (4.48 in³/rev), this unit incorporates a heavy-duty precision drive shaft (code 34), a reinforced 6PTF 6-bolt mounting spigot flange (code S8), side-positioned SAE J518 Code 61 4-bolt flanged ports (inlet ME 2", outlet MD 1-1/4"), standard Buna-N elastomeric seals (code N), and cast-iron CSC construction in anti-clockwise rotation without outboard bearing (code S0). Engineered entirely from high-strength spheroidal ductile cast iron, the pump delivers high mechanical stiffness and fatigue resistance under severe continuous operating pressures up to 240 bar (3,480 psi), intermittent pressures to 260 bar (3,770 psi), and peak pressure resistance up to 280 bar (4,060 psi), ensuring factory-standard volumetric efficiency and long-term durability in high-demand construction, mining, and industrial duty cycles.
| HENGYUHANG 6PTF (CASAPPA KP40.73 Replacement) Applications
This 6PTF customized gear pump assembly is engineered to power primary high-flow implement and heavy-duty steering circuits on large mobile machinery and industrial systems. It supplies pressurized hydraulic fluid on heavy earthmoving excavators, large wheel loaders, mining haul trucks, road reclaimers, asphalt cold planers, crawler cranes, and heavy telescopic container handlers. In forestry and marine sectors, it drives log debarkers, timber processor heads, anchor winches, and offshore crane hydraulic circuits. Additionally, its high structural rigidity and custom 6PTF mounting geometry make it suitable for stationary industrial installations, including metal scrap shears, high-tonnage baling presses, plastic recycling compactors, and continuous-duty hydraulic power units (HPUs) operating under high hydraulic shock and thermal cycles.
Key parameters
Product Models: HENGYUHANG 6PTF Customized Series / Direct Replacement for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC
Brand Replacement: CASAPPA OEM Replacement (KP40.73, KP35, KP30 Series) or as requested.
Displacement Options: 73.40 cm³/rev (4.48 in³/rev) standard; full platform coverage from 19.63 to 180.73 cm³/rev
Rotation Direction: Anti-clockwise (S), looking at the drive shaft (clockwise version available as code D)
Continuous Operating Pressure (p1): 240 bar (3,480 psi)
Peak Pressure (p3): Up to 280 bar (4,060 psi)
Mounting & Drive Shaft: 6PTF 6-bolt heavy-duty spigot flange (S8) with heavy-duty precision drive shaft (34)
Min./max. speed (350 / 2,500 r/min), relief-valve settings, interface data, and tightening torques are listed in full in Techspecs below.
1. Overview of HENGYUHANG 6PTF Series (Replacement for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC)
The HENGYUHANG 6PTF Customized Series represents specialized hydraulic engineering designed to provide direct-fit replacements for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC pumps on heavy mobile machinery where standard 2-bolt or 4-bolt commercial flanges are unsuitable. Built to replicate the exact mounting geometry, pilot spigot diameter, bolt-circle pattern, and port centerlines of original 6PTF assemblies, it eliminates expensive field retrofits, custom adapter brackets, and extended downtime.
The pump features a robust three-piece construction consisting of front mounting flange, central gear housing, and rear cover all cast from high-tensile spheroidal ductile iron. This construction resists barrel expansion and internal pressure leakage during high-pressure digging and breakout cycles above 240 bar. Internally, a precision-ground alloy steel gear set rotates within hydrodynamic PTFE DU sleeve bearings lubricated by fluid slip channels. Floating bronze-faced hydrostatic thrust balance plates dynamically compensate for thermal expansion and axial face wear, maintaining volumetric efficiencies exceeding 95% across continuous operation. The side-mounted SAE J518 Code 61 flanged porting (ME 2" inlet / MD 1-1/4" outlet) ensures laminar fluid entry with minimal intake turbulence and cavitation risks.
2. Dimension of HENGYUHANG 6PTF Series (Replacement for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC)
Reference dimensions for the HENGYUHANG 6PTF customized gear pump assembly with 6-bolt heavy-duty mounting flange (S8) and side-mounted SAE J518 flanged ports. The letters correspond to the dimensional drawing.
| Ref. | mm | in | Description |
|---|---|---|---|
| L | 236.0 | 9.29 | Total pump length from mounting flange face to rear cover |
| A | 168.5 | 6.63 | Centerline of inlet and outlet ports from mounting face |
| B | 118.0 | 4.65 | Centerline of port from pump body rear face |
| D | 127.0 | 5.00 | 6PTF precision pilot spigot diameter (+0 / -0.05 mm) |
| PCD | 160.0 | 6.30 | Pitch circle diameter of the 6-bolt mounting pattern |
| S | M12 / 1/2-13 | — | 6-bolt mounting thread specification |
| H | 198.0 | 7.80 | Overall pump body height |
| W | 176.0 | 6.93 | Overall pump body width |
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Mounting flange | S8 — 6PTF 6-bolt heavy-duty spigot flange (pilot Ø 127.0 mm / 5.0 in) |
| Drive shaft | 34 — Heavy-duty SAE "C" 14-tooth involute spline shaft (12/24 DP) / heavy cylindrical shaft |
| Outboard bearing | 0 — without outboard bearing (direct bell-housing coupling engagement) |
| Rotation | S — anti-clockwise, looking at the drive shaft end (D clockwise optional) |
| Ports position | L — side-positioned ports (inlet and outlet on opposite lateral body faces) |
| Inlet Port (ME) | SAE J518 Code 61 4-bolt split flange — 2" (M12 metric fastening threads) |
| Outlet Port (MD) | SAE J518 Code 61 4-bolt split flange — 1-1/4" (M10 metric fastening threads) |
| Seals | N — Buna NBR standard (Viton-FKM available for high-temperature applications) |
| Body construction | High-strength spheroidal graphite ductile cast iron (heavy-duty CSC configuration) |
| Mounting flange bolt tightening torque | 160 ±10 Nm (1,416 ÷ 1,504 lbf in) |
| Body tie-rod clamp bolt torque | 190 ±15 Nm (1,550 ÷ 1,814 lbf in) |
3. Pump Installation Specifications HENGYUHANG 6PTF Series
The pump designation follows a structured 10-segment matrix defining displacement, mechanical interfaces, and customization parameters:
Code structure — reference: HENGYUHANG 6PTF — KP 40.73S0-34S8-LME/MD-N-CSC Replacement
| Pos. | Code | Meaning & Replacement Configuration |
|---|---|---|
| 1 | KP40 | Pump Series: KAPPA 40 heavy-duty cast-iron external gear pump architecture |
| 2 | 73 | Displacement: Nominal 73.40 cm³/rev (4.48 in³/rev) |
| 3 | S | Direction of rotation: Anti-clockwise (looking at drive shaft); D for clockwise |
| 4 | 0 | Outboard bearing: Without outboard bearing |
| 5 | 34 | Drive shaft: Heavy-duty SAE "C" 14-tooth involute spline shaft |
| 6 | S8 | Mounting flange: 6PTF 6-bolt heavy-duty pilot spigot mounting flange |
| 7 | L | Ports position: Side-positioned ports |
| 8 | ME/MD | Port configuration: Inlet ME (SAE 2" 3000 psi) / Outlet MD (SAE 1-1/4" 3000 psi) |
| 9 | N | Seals: Buna-N (NBR) elastomeric seals (temperature -25 °C to +80 °C) |
| 10 | CSC | Compact cast-iron heavy-duty construction standard |
Reading your code & replacement cross-references
| HENGYUHANG Model Code | Replaces CASAPPA OEM Code | Frame Platform | Displacement | Mounting Flange | Porting (In/Out) | Primary Machine Focus |
|---|---|---|---|---|---|---|
| HYH-6PTF-KP40.73S0-34S8-LME/MD-N-CSC | KP40.73S0-34S8-LME/MD-N-CSC | KP 40 | 73.40 cm³/rev | 6PTF 6-Bolt (S8) | SAE 2" / SAE 1-1/4" | Heavy excavator / mobile crane main pump |
| HYH-6PTF-KP40.87S0-34S8-LME/MD-N-CSC | KP40.87S0-34S8-LME/MD-N-CSC | KP 40 | 87.04 cm³/rev | 6PTF 6-Bolt (S8) | SAE 2" / SAE 1-1/4" | Mining loader implement circuit |
| HYH-6PTF-KP40.109S0-34S8-LMF/ME-N-CSC | KP40.109S0-34S8-LMF/ME-N-CSC | KP 40 | 109.40 cm³/rev | 6PTF 6-Bolt (S8) | SAE 2-1/2" / SAE 2" | Crawler crane / large hydraulic power pack |
| HYH-6PTF-KP35.63S0-Custom | KP35.63-6PTF Series | KP 35 | 63.80 cm³/rev | 6PTF Tailored Flange | SAE 2" / SAE 1-1/4" | Medium wheel loader / backhoe implement |
| HYH-6PTF-KP30.46S0-Custom | KP30.46-6PTF Series | KP 30 | 46.34 cm³/rev | 6PTF Tailored Flange | SAE 1-1/2" / SAE 1" | Compact road paver / utility vehicle pump |
| Techspecs of HENGYUHANG 6PTF Series (Replacement for CASAPPA KP40.73S0-34S8-LME/MD-N-CSC)
| Performance
| Parameter | KP40.73 Replacement | KP35 Platform | KP30 Platform | Unit |
|---|---|---|---|---|
| Geometric Displacement | 73.40 (4.48) | 63.80 (3.89) | 46.34 (2.83) | cm³/rev (in³/rev) |
| Continuous Operating Pressure p1 | 240 (3,480) | 260 (3,770) | 250 (3,625) | bar (psi) |
| Intermittent Operating Pressure p2 | 260 (3,770) | 280 (4,060) | 270 (3,915) | bar (psi) |
| Peak Pressure p3 | 280 (4,060) | 300 (4,350) | 290 (4,205) | bar (psi) |
| Maximum Continuous Speed | 2,500 | 2,800 | 2,800 | r/min |
| Minimum Operating Speed | 350 | 350 | 350 | r/min |
| Theoretical Flow @ 1,500 r/min | 110.1 (29.1) | 95.7 (25.3) | 69.5 (18.4) | l/min (US gpm) |
| Theoretical Flow @ 2,200 r/min | 161.5 (42.7) | 140.4 (37.1) | 101.9 (26.9) | l/min (US gpm) |
| Max. Allowable Drive Shaft Input Torque | 650 (5,753) | 480 (4,248) | 380 (3,363) | Nm (lbf in) |
| Volumetric Efficiency | ≥ 95% | ≥ 95% | ≥ 95% | — |
| Hydro-mechanical Efficiency | ≥ 91% | ≥ 90% | ≥ 90% | — |
| Unit Mass (Approximate) | 37.5 (82.7) | 29.5 (65.0) | 23.5 (51.8) | kg (lbs) |
| Interfaces and configuration
| Parameter | Value |
|---|---|
| Rotation | S — anti-clockwise, looking at the drive shaft end (D clockwise available) |
| Mounting flange | S8 — 6PTF 6-bolt heavy-duty spigot flange (pilot Ø 127.0 mm / 5.0 in) |
| Drive shaft | 34 — Heavy-duty SAE "C" 14-tooth involute spline shaft (12/24 DP) |
| Ports position | L — side-positioned ports (lateral inlet and outlet) |
| Inlet Port (ME) | SAE J518 Code 61 4-bolt split flange 2" (M12 fastening threads) |
| Outlet Port (MD) | SAE J518 Code 61 4-bolt split flange 1-1/4" (M10 fastening threads) |
| Outboard bearing | 0 — without outboard bearing |
| Seals | N — Buna NBR standard (Viton-FKM high-temperature optional) |
| Construction | High-tensile spheroidal ductile cast iron body and end-covers (CSC compact) |
| Mounting flange bolt tightening torque | 160 ±10 Nm (1,416 ÷ 1,504 lbf in) |
| Body tie-rod clamp bolt torque | 190 ±15 Nm (1,550 ÷ 1,814 lbf in) |
| Port bolt tightening torque | M10: 35 +2.5 Nm (310 ÷ 332 lbf in) · M12: 60 +5 Nm (531 ÷ 575 lbf in) |
| Operating conditions
| Parameter | Value |
|---|---|
| Fluid | Mineral-oil-based hydraulic fluid to ISO 6743/4 (HL, HLP) and DIN 51524 |
| Inlet pressure range (absolute) | 0.7 ÷ 3.0 bar abs. (10 ÷ 44 psi abs.) |
| Viscosity — recommended | 17 to 60 mm²/s (cSt) [85 to 280 SSU] |
| Viscosity — permissible range | 12 to 1,000 mm²/s (cSt) [65 to 4,600 SSU] |
| Cold start maximum viscosity | 2,000 mm²/s (cSt) [9,270 SSU] |
| Fluid temperature, N seals | −25 °C to +80 °C continuous (−13 °F to +176 °F); 100 °C (212 °F) peak |
| Fluid temperature, V seals | −20 °C to +110 °C continuous (−4 °F to +230 °F); 125 °C (257 °F) peak |
| Recommended contamination level | Δp > 210 bar: NAS 1638 class 8 / ISO 4406 19/17/14 (10 μm filter element β10(c) ≥ 200) |
| Permissible contamination level | Δp < 140 bar: NAS 1638 class 10 / ISO 4406 21/19/16 (25 μm filter element) |
| Storage conditions | Dry environment, 5 °C to 20 °C (41 °F to 68 °F), maximum 24 months |
| Dimensions | see section 2. |
| Advantages of HENGYUHANG 6PTF OEM Customized Series
Direct OEM Drop-In Compatibility. Manufactured to replicate exact CASAPPA 6PTF mounting interfaces, pilot diameters, shaft dimensions, and port centerlines, eliminating expensive machinery re-engineering or bell-housing machining.
100% High-Grade Ductile Cast-Iron Construction. High structural rigidity resists casing deflection under heavy digging and lifting operations, preventing internal pressure loss and barrel fatigue cracking.
High Pressure Rating for Severe Duty Cycles. Continuously operates at 240 bar (3,480 psi) with peak resistance to 280 bar (4,060 psi), handling sudden shock loads during machine stall or heavy load breakout.
High Volumetric Efficiency. Floating pressure-balanced hydrostatic thrust plates ensure axial sealing clearances are maintained across all temperature and pressure ranges, achieving volumetric efficiency above 95%.
Anti-Cavitation Optimized Porting. Large ME (2") inlet and MD (1-1/4") outlet profile promotes laminar flow intake, minimizing oil aeration, turbulence, and noise under maximum operating speeds.
Flexible Platform Scaling (KP40 / KP35 / KP30). Customization options span multiple displacement brackets from 19.63 to 180.73 cm³/rev, allowing equipment builders to select the exact flow rate required for custom duty cycles.
Reference — HENGYUHANG 6PTF Series
Series architecture across KP40, KP35, and KP30
| Frame Size | Displacement Range | Continuous Pressure (p1) | Peak Pressure (p3) | Speed Range | Application Focus |
|---|---|---|---|---|---|
| KP40 | 61.43 to 180.73 cm³/rev | 200 to 260 bar | 230 to 280 bar | 350 to 2,500 r/min | Heavy mining excavators, large industrial presses |
| KP35 | 40.00 to 65.00 cm³/rev | 250 to 280 bar | 280 to 300 bar | 350 to 2,800 r/min | Mid-heavy backhoes, wheel loaders, mobile cranes |
| KP30 | 19.63 to 46.34 cm³/rev | 230 to 280 bar | 270 to 300 bar | 350 to 3,000 r/min | Compact excavators, pavers, industrial HPUs |
Complete order numbers and custom replacement equivalents identified on the market
Complete pump order and designation codes identified for this product group:
HENGYUHANG 6PTF-KP40.73S0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.73S0-34S8-LME/MD-N-CSC)
HENGYUHANG 6PTF-KP40.87S0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.87S0-34S8-LME/MD-N-CSC)
HENGYUHANG 6PTF-KP40.109S0-34S8-LMF/ME-N-CSC (Replaces CASAPPA KP40.109S0-34S8-LMF/ME-N-CSC)
HENGYUHANG 6PTF-KP40.73D0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.73D0-34S8-LME/MD-N-CSC)
HENGYUHANG 6PTF-KP35.63S0-Custom (Replaces CASAPPA KP35 6PTF series)
HENGYUHANG 6PTF-KP30.46S0-Custom (Replaces CASAPPA KP30 6PTF series)
Brand Replacement
HENGYUHANG specializes in custom OEM replacement manufacturing for CASAPPA hydraulic gear pumps, specifically the 6PTF specialized model KP40.73S0-34S8-LME/MD-N-CSC as well as custom variants across the KP40, KP35, and KP30 series. By utilizing high-precision CNC machining and custom tooling, HENGYUHANG manufactures exact dimensional replicas of 6PTF flanges, unique shaft profiles, and port positions, allowing fleet operators and machine builders to replace specialized or discontinued Casappa assemblies without altering engine couplings, mounting brackets, or hydraulic plumbing.
All custom replacement units are manufactured to rigorous metallurgical standards and undergo 100% hydraulic testing to verify flow rates, pressure holding, and internal seal integrity. Customers can order customized units by providing original nameplate data, dimensional drawings, or sample units.
Applications
Typical equipment applications of the 6PTF customized gear pump series:
Heavy Construction Machinery: Crawler excavators, heavy wheel loaders, asphalt cold planers, and soil stabilizers.
Mining Equipment: Underground mining haulers, drill jumbos, continuous miners, and blast-hole drilling rigs.
Material Handling & Lifting: Heavy rough-terrain mobile cranes, harbor reach stackers, and heavy industrial winches.
Forestry & Marine Machinery: Tree felling heads, log debarkers, offshore crane power units, and marine anchor winches.
Industrial Hydraulics: High-capacity hydraulic power units (HPUs), heavy metal recycling shears, and waste balers.
Special Purpose Vehicles: Airport snow removal vehicles, heavy fire rescue trucks, and specialized mobile carrier units.
In all applications, the pump delivers stable continuous high-pressure fluid flow under challenging ambient temperatures, high shock loads, and continuous duty cycles.
Package & Shipping
| Item | Specification |
|---|---|
| Packaging | Single unit packed in heavy-duty export wooden crate with protective port plugs and shock-absorbing foam |
| Selling unit | Single item — MOQ 1 unit |
| Net weight | Approximately 37.5 kg (KP40.73) depending on displacement and section configuration |
| Gross weight | Approximately 41.0 kg with export wooden crate packaging |
| Lead time | 3 to 7 working days for standard customized configurations; volume batches per production schedule |
| Shipping | Air freight, ocean shipping, or international express (DHL, FedEx, UPS) directly to destination |
| Customization | Full customization of mounting flanges, shaft styles, port configurations, and laser nameplates |
| Warranty | 1 year comprehensive warranty against manufacturing defects |
Why Choose Hengyuhang?
Custom Hydraulic Manufacturing Specialist. Quanzhou Hengyuhang Power Technology Co., Ltd. is located in Fujian, China, specializing in customized, non-standard, and OEM-equivalent hydraulic gear pumps, motors, and multi-section pump assemblies.
One-Piece Minimum Order Quantity. Custom-engineered units available with an MOQ of just 1 piece, eliminating high-volume tooling barriers for single-machine repairs and prototype testing.
Full Non-Standard 6PTF Engineering Capability. Expertise in reverse-engineering and manufacturing specialized mounting flanges, unique shaft tapers/splines, and metric/BSPP/SAE port configurations.
100% Computerized Hydraulic Testing. Every custom-built pump is thoroughly bench-tested under full operating pressure, verifying volumetric efficiency, mechanical torque, and external seal integrity prior to shipment.
Multi-Platform Architecture (KP40 / KP35 / KP30). Extensive engineering coverage across all KAPPA frame sizes, supporting single, tandem, and triple custom pump configurations.
Fast Global Logistics. Direct connections to international logistics networks ensure prompt delivery of custom replacement pumps to minimize costly machinery downtime.
One-Year Comprehensive Warranty. Full 12-month warranty backed by responsive engineering support for fitment confirmation and commissioning.
CASAPPA KP40.73S0-34S8-LME/MD-N-CSC Cast Iron External Hydraulic Gear Pump is a high-pressure, large-displacement external gear pump from the CASAPPA KP40 (Kappa Group 40) series. Engineered with a solid high-strength cast iron body, precision-machined heavy-duty gears, and pressure-balanced wear plates, it delivers 72.60 cm³/rev nominal displacement (73 cc/rev class), 250 bar rated pressure, and up to 3000 min⁻¹ maximum rotational speed. Designed for demanding mobile machinery and industrial hydraulic systems, it provides exceptional volumetric efficiency, robust mechanical durability, smooth flow delivery, and extended operational life under continuous heavy-duty cycles.
| Applications
The KP40.73S0-34S8-LME/MD-N-CSC gear pump is widely deployed across heavy construction equipment (large excavators, wheel loaders, bulldozers, mobile cranes), agricultural machinery (heavy tractors, combine harvesters), industrial manufacturing systems (automated production lines, high-tonnage hydraulic presses, heavy conveyors), and material handling machinery (heavy forklifts, aerial work platforms), delivering stable, continuous hydraulic power under severe high-load environments.
| Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | CASAPPA (OEM / direct replacement) |
| Model | KP40.73S0-34S8-LME/MD-N-CSC |
| Series | KP40 (Kappa Group 40) |
| Product Type | Cast iron external hydraulic gear pump (single pump) |
| Housing Material | High-strength cast iron |
| Nominal Displacement | 72.60 cm³/rev (73 cc/rev nominal, 4.43 in³/rev) |
| Rated Operating Pressure | 250 bar (3625 psi) |
| Max. Peak Pressure | Up to 300 bar (per manufacturer documentation—confirm before use) |
| Max. Speed | 3000 min⁻¹ |
| Flow @ 1500 rpm | 108.9 L/min (theoretical, displacement × 1500 rpm) |
| Efficiency | >90% overall efficiency |
| Mounting Flange and Shaft | Flange mounted — code 34S8 (SAE standard 4-bolt) |
| Port Configuration | LME / MD split flange / threaded ports (per model code) |
| Rotation Direction | Counter-clockwise (S0) / N rotation code (confirm against nameplate) |
| Body Construction Code | CSC (cast iron single pump, standard rear cover) |
| Hydraulic Fluid | Mineral hydraulic oil (ISO VG 46 / HLP) |
| Operating Temperature Range | -20°C to +80°C |
| Typical Applications | Heavy excavators, wheel loaders, cranes, bulldozers, industrial presses, agricultural harvesters |
| Order number |
| HENGYUHANG 6PTF-KP40.73S0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.73S0-34S8-LME/MD-N-CSC) |
| HENGYUHANG 6PTF-KP40.87S0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.87S0-34S8-LME/MD-N-CSC) |
| HENGYUHANG 6PTF-KP40.109S0-34S8-LMF/ME-N-CSC (Replaces CASAPPA KP40.109S0-34S8-LMF/ME-N-CSC) |
| HENGYUHANG 6PTF-KP40.73D0-34S8-LME/MD-N-CSC (Replaces CASAPPA KP40.73D0-34S8-LME/MD-N-CSC) |
| HENGYUHANG 6PTF-KP35.63S0-Custom (Replaces CASAPPA KP35 6PTF series) |
| HENGYUHANG 6PTF-KP30.46S0-Custom (Replaces CASAPPA KP30 6PTF series) |
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