CASAPPA Replacements
CASAPPA Hydraulic Gear Pumps 799137H KP30 Series
Hengyuhang Cast iron Tandem Gear Pump 799137H / 799137GX / 85824395 is a robust positive displacement pump engineered as a high-pressure direct OEM replacement for Case and New Holland backhoe loaders, delivering high volumetric efficiency and stable fluid power under demanding operating pressures.
| Applications of CASAPPA 799137H / 799137GX / 85824395 Hydraulic Gear Pumps
This cast iron tandem gear pump is engineered for heavy-duty hydraulic circuit pressurization across construction machinery, agricultural equipment, and mobile earthmoving systems. It powers primary implement cylinders, priority steering circuits, and auxiliary drive mechanisms in equipment operating under continuous high loads and severe environmental conditions.
Key Technical Specifications
Product Model: CASAPPA 799137H / 799137GX / 7993004W / 799137H0 / 85824395
Brand Replacement: CASAPPA, CNH, Case, New Holland OEM or as requested.
Displacement: Tandem combined 24 to 44 cm³/rev per stage
Rotation Direction: Clockwise (D), counter-clockwise (S)
Speed Range: Min. speed 350 r/min; Max. speed 3000 r/min
Peak Pressure: Up to 300 bar
| Overview of CASAPPA 799137H / 799137GX / 85824395 High-Pressure Gear Pumps
CASAPPA 799137H, 799137GX, 7993004W, 799137H0, and 85824395 are high-pressure cast-iron tandem external gear pumps. Casappa builds this range around heavy-duty bodies, intermediate flanges, and mounting plates in high-strength spheroidal ductile cast iron, delivering maximum mechanical stiffness, vibration dampening, and resistance to housing deformation under high cyclical pressure spikes. Inside the pump, dual external gear sets run on low-friction, high-load hydrodynamic PTFE DU sleeve bearings lubricated by fluid slip channels between floating bronze-faced thrust balance plates that compensate for axial wear and maintain volumetric efficiencies exceeding 95% across continuous operation.
In heavy earthmoving applications, this unit draws oil from the reservoir and supplies two dedicated circuits: a high-flow primary stage dedicated to loader bucket and backhoe boom functions, and a synchronized secondary stage powering hydrostatic steering, braking, or pilot controls. Configured with a heavy-duty SAE 2-bolt mounting flange and SAE involute spline shaft, the pump features side-mounted SAE J518 4-bolt split-flange ports for leak-free, shock-resistant fluid connections. Operating in clockwise rotation (D) without an external outboard bearing (0), this tandem unit delivers direct dimensional and functional interchangeability for factory-installed CNH assemblies.
| Dimension of CASAPPA 799137H / 799137GX / 85824395 High-Pressure Gear Pumps
Reference dimensions for the tandem gear pump assembly with heavy-duty SAE 2-bolt mounting flange and side SAE J518 flanged ports. The letters correspond to the dimensional drawing.
| Ref. | mm | in | Description |
|---|---|---|---|
| L1 | 285.5 | 11.24 | Total assembly length from mounting face to rear cover |
| L2 | 145.0 | 5.71 | Front pump section length to intermediate coupling flange |
| L3 | 140.5 | 5.53 | Rear pump section length from intermediate flange to rear cover |
| A1 | 98.8 | 3.89 | Front section port centerline from mounting face |
| A2 | 225.5 | 8.88 | Rear section port centerline from mounting face |
| D1 | 101.6 | 4.00 | SAE 2-bolt pilot spigot diameter (+0 / -0.05 mm) |
| S1 | 146.0 | 5.75 | Center-to-center distance between mounting bolt holes |
Interface data needed with the drawing:
| Item | Value |
|---|---|
| Mounting flange | SAE standard 2-bolt heavy-duty pilot flange (Ø 101.6 mm / 4.0 in spigot pilot) |
| Drive shaft | SAE standard involute spline shaft (high-torque 16/32 DP flat root side fit) |
| Outboard bearing | 0 — without outboard bearing (standard heavy-duty drive configuration) |
| Rotation | D — clockwise, looking at the drive shaft end |
| Ports position | Side-positioned flanged ports on both front and rear stages |
| Primary Stage Ports (Inlet / Outlet) | SAE J518 Code 61 split-flange — Inlet 1-1/4" / 1-1/2" (M10/M12), Outlet 3/4" / 1" (M10) |
| Secondary Stage Ports (Inlet / Outlet) | SAE J518 Code 61 split-flange — Inlet 1-1/4" (M10), Outlet 1/2" / 3/4" (M8/M10) |
| Seals | N — Buna NBR standard (Viton-FKM available for high temperature) |
| Body construction | High-tensile spheroidal graphite ductile cast iron (all stages) |
| Mounting flange bolt tightening torque | 85 ±5 Nm (750 ÷ 800 lbf in) |
| Intermediate tie-rod clamp bolt torque | 140 ±14 Nm (1,115 ÷ 1,363 lbf in) |
| Pump Installation Specifications CASAPPA 799137H / 799137GX / 85824395
The CASAPPA KAPPA multi-section pump architecture uses a standardized modular coding matrix where each position defines a mechanical parameter of the primary, intermediate, and secondary stages:
Code structure — reference: KP 30/35/40 Series Tandem Cast-Iron Assembly
| Pos. | Meaning | Standard Configuration & Options |
|---|---|---|
| 1 | Pump Series | KP35 / KP40 / KP30 multi-section cast iron gear pump architecture |
| 2 | Rotation | D clockwise (looking at shaft) / S anti-clockwise |
| 3 | Outboard bearing | 0 without outboard bearing (direct bell-housing spline engagement) |
| 4 | Drive shaft | SAE heavy-duty involute spline shaft (high-torque multi-stage rating) |
| 5 | Mounting flange | SAE 2-bolt heavy-duty spigot flange (101.6 mm pilot diameter) |
| 6 | Ports position | Side-positioned ports on front and rear pump casings |
| 7 | Ports IN/OUT | SAE J518 Code 61 4-bolt split-flange standard connections (metric fastening threads) |
| 8 | Seals | N Buna NBR (standard) / V Viton-FKM (high-temperature specification) |
| 9 | Body design | Ductile cast iron high-pressure heavy-duty construction |
| 10 | Section coupling | Internal synchronized heavy-duty splined intermediate coupling |
| Reading your codes & OEM cross-references
| Part Number | Source / Manufacturer | Primary Machine Fitment | Configuration Notes |
|---|---|---|---|
| 799137GX | CASAPPA | New Holland LB115, LB115.B, B110, B115 / Case 695SM | Tandem cast iron gear pump with integrated control valve configuration |
| 799137H | CASAPPA | Case 580 / 590 Super M, New Holland LB Series | Heavy-duty dual gear pump assembly for main hydraulic loop |
| 799137H0 | CASAPPA | New Holland LB115 / LB115CP Backhoe Loaders | Tandem cast iron external gear pump, standard rotation |
| 7993004W | CASAPPA | Industrial HPUs & CNH Construction Equipment | High-pressure dual pump assembly |
| 85824395 / 85824395R | CNH / New Holland | New Holland LB115, LB115.B, LB115CP / Case 695SM | OEM primary hydraulic pump assembly (New & Remanufactured) |
| 85826148 | Case / New Holland | Case 695SM, New Holland LB115 4WS Backhoe | OEM direct replacement pump assembly |
| 85826149 | Case / New Holland | Case 580 / 695 Series Equipment | Companion OEM pump / valve variant |
| 85817699 / 79933052 | Case / New Holland | CNH Loader Backhoes (Intermediate revision) | Direct interchangeable tandem pump unit |
Techspecs — CASAPPA 799137H / 799137GX / 85824395 High-Pressure Gear Pumps
Performance
| Parameter | Primary Work Section | Secondary Auxiliary / Steering Section |
|---|---|---|
| Applicable Architecture | KAPPA KP35 / KP40 / KP30 | KAPPA KP30 / KP20 |
| Nominal Displacement | 34.0 to 44.0 cm³/rev (2.07 to 2.68 in³/rev) | 24.0 to 29.0 cm³/rev (1.47 to 1.77 in³/rev) |
| Continuous Operating Pressure p1 | 250 bar (3,625 psi) | 260 bar (3,770 psi) |
| Intermittent Relief Setting p2 | 270 bar (3,915 psi) | 280 bar (4,060 psi) |
| Peak Pressure p3 | 290 bar (4,205 psi) | 300 bar (4,350 psi) |
| Maximum Continuous Speed | 3,000 r/min | 3,000 r/min |
| Minimum Operating Speed | 350 r/min | 350 r/min |
| Theoretical Flow @ 1,500 r/min | ~51.0 to 66.0 l/min (13.5 to 17.4 US gpm) | ~36.0 to 43.5 l/min (9.5 to 11.5 US gpm) |
| Theoretical Flow @ 2,200 r/min (Rated) | ~75.0 to 96.8 l/min (19.8 to 25.6 US gpm) | ~52.8 to 63.8 l/min (13.9 to 16.8 US gpm) |
| Max. Allowable Drive Shaft Input Torque | 450 Nm (3,980 lbf in) combined input capacity | — |
| Intermediate Coupling Torque Capacity | 220 Nm (1,947 lbf in) | — |
| Volumetric Efficiency | ≥ 95% at rated operating pressure | ≥ 95% at rated operating pressure |
| Hydro-mechanical Efficiency | ≥ 90% | ≥ 90% |
Interfaces and configuration
| Parameter | Value |
|---|---|
| Rotation | D — clockwise, looking at the drive shaft end |
| Mounting flange | SAE standard 2-bolt heavy-duty spigot flange (pilot Ø 101.6 mm / 4.0 in) |
| Drive shaft | SAE standard heavy-duty involute spline shaft |
| Ports position | Side-positioned flanged ports on both stages |
| Primary Stage Ports | SAE J518 Code 61 4-bolt split flange — Inlet 1-1/4" / 1-1/2", Outlet 3/4" / 1" |
| Secondary Stage Ports | SAE J518 Code 61 4-bolt split flange — Inlet 1-1/4", Outlet 1/2" / 3/4" |
| Outboard bearing | 0 — without outboard bearing |
| Seals | N — Buna NBR standard (Viton-FKM high-temperature optional) |
| Construction | High-strength spheroidal ductile cast iron across all sections |
| Mounting flange bolt tightening torque | 85 ±5 Nm (750 ÷ 800 lbf in) |
| Intermediate tie-rod clamp bolt torque | 140 ±14 Nm (1,115 ÷ 1,363 lbf in) |
| Port bolt tightening torque | M8: 20 +1 Nm (177 ÷ 186 lbf in) · 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
100% Cast-Iron Construction Across All Sections
Spheroidal graphite cast iron eliminates housing deflection and barrel expansion under continuous digging pressures above 250 bar, preventing internal fluid slip and maintaining cycle speeds.
Direct OEM Interchangeability
Engineered with exact mounting pilot diameters, spline tooth dimensions, and port centerline spacings for Case and New Holland 85824395, 85826148, and 799137GX assemblies for simple drop-in replacement.
Dual-Stage Synchronized Flow
Combines primary implement supply and auxiliary steering/pilot flow into a single compact housing footprint, eliminating the complexity, cost, and driveline space of two separate pumps.
Extended Bearing Longevity under Contamination
High-load hydrodynamic PTFE DU sleeve bearings spread shaft loads over broad hydrodynamic oil films, offering superior contamination and fatigue tolerance compared to needle roller bearings.
Superior Volumetric Efficiency
Floating hydrostatic thrust plates automatically compensate for face wear and thermal variations, holding volumetric efficiency above 95% over thousands of service hours.
Low Noise & Reduced Pressure Pulsation
Precision-ground gear teeth with anti-trapping decompression grooves minimize hydraulic ripple, lowering acoustic emissions inside machine operator cabs.
Standard SAE Split-Flange Sealing
SAE J518 Code 61 4-bolt split-flange ports eliminate port thread stress and body cracking risks caused by tapered pipe threads under high hydraulic impulse shock.
6. Reference of CASAPPA 799137H / 799137GX / 85824395 High-Pressure Gear Pumps
6.1 Series architecture across KP30, KP35, and KP40
The tandem assemblies in this series draw upon the standardized modular KAPPA frame sizes:
| Frame Size | Displacement Range | Continuous Pressure (p1) | Peak Pressure (p3) | Speed Range | Application Focus |
|---|---|---|---|---|---|
| KP30 | 19.63 to 43.98 cm³/rev | 230 to 280 bar | 270 to 300 bar | 350 to 3,000 r/min | Compact-to-mid backhoes, secondary stages |
| KP35 | 40.00 to 65.00 cm³/rev | 250 to 280 bar | 280 to 300 bar | 350 to 2,800 r/min | Mid-to-heavy backhoe main stages (LB115) |
| KP40 | 61.43 to 180.73 cm³/rev | 200 to 260 bar | 230 to 280 bar | 350 to 2,500 r/min | Heavy earthmoving excavators, industrial HPUs |
6.2 Complete order and OEM cross-reference numbers identified on the market
Complete pump order and cross-reference numbers identified for this equipment group:
| Part number |
| 799137GX |
| 799137H |
| 799137H0 |
| 799137GY |
| 7993004W |
| 85824395 |
| 85824395R |
| 85826148 |
| 85826149 |
| 85817699 |
| 87362336 |
| 79914144 |
| 79933052 |
| KP30.34-05S6-LMF/0D-M5-KSL/30 |
| KP30.38-05S6-LMF-00-M5-KSL-30 |
| KP30.43-A8K9-LMD/MC |
7. Brand Replacement
HENGYUHANG supplies precision engineered replacements for the CASAPPA KAPPA tandem pump series, including part numbers 799137H, 799137GX, 7993004W, 799137H0, and OEM number 85824395. The replacement is manufactured to exact OEM dimensional envelopes and standardized SAE interface specifications — matching drive splines, pilot flanges, and split-flange hydraulic ports — allowing machines originally fitted with Casappa or CNH equipment to be restored to factory hydraulic performance without modifying driveline couplings, chassis mounting brackets, or pipework.
Replacement assemblies comply with published OEM performance parameters and pressure ratings. Fitment is determined by the original equipment part number or machine model; please provide the original pump nameplate code or vehicle serial number when ordering.
8. Applications of CASAPPA 799137H / 799137GX / 85824395 High-Pressure Gear Pumps
Typical machinery applications of this high-pressure tandem pump series:
Backhoe Loaders: Primary hydraulic pump on Case and New Holland four-wheel steer (4WS) and two-wheel steer (2WS) machines (LB115, LB115.B, LB115CP, Case 695SM, 580/590 Super M).
Building & Construction: Wheel loaders, compact excavators, trenchers, skid-steer loaders, and compaction rollers.
Material Handling: Telescopic handlers, rough-terrain forklifts, aerial work platforms, and mobile cranes.
Forestry & Timber Machinery: Forwarders, log splitters, conveyor drives, and tree harvesting attachments.
Municipal & Utility Vehicles: Refuse compactor trucks, street sweepers, vacuum trucks, and snow removal hydraulic circuits.
Industrial Hydraulics: High-pressure hydraulic power packs, metal scrap balers, waste compactors, and stationary presses.
In these machines the pump feeds primary work circuits and priority steering loops that operate continuously under demanding pressure cycles, requiring uninterrupted volumetric efficiency and high thermal stability.
9. Package & Shipping
| Item | Specification |
|---|---|
| Packaging | Single unit secured in reinforced wooden export crate with protective port plugs |
| Selling unit | Single item — MOQ 1 unit |
| Net weight | Approximately 28.5 kg to 34.0 kg depending on multi-stage displacement configuration |
| Gross weight | Approximately 31.0 kg to 37.0 kg with export wooden crate packaging |
| Lead time | 3 to 7 working days for standard configurations; volume orders per schedule |
| Shipping | Air freight, sea freight, or international express (DHL, FedEx, UPS) to destination |
| Customization | Custom laser nameplate, custom branding, and specialized packaging for fleet distributors |
| Warranty | 1 year full warranty against manufacturing defects |
10. Why Choose Hengyuhang?
A hydraulic specialist, not a general trader. Quanzhou Hengyuhang Power Technology Co., Ltd. is located in Fujian, China, specializing in the precision manufacture of hydraulic gear pumps, motors, tandem assemblies, and custom hydraulic valve systems.
One-piece minimum order. MOQ is one unit, allowing single machines or field repairs to be completed without purchasing production batches.
OEM model-level cross-referencing. Provide your original pump code (799137GX, 799137H, 85824395, etc.) or machine model (New Holland LB115, Case 695SM), and every dimensional interface, port pattern, and shaft spline is verified prior to dispatch.
Full multi-section architecture coverage. Comprehensive manufacturing coverage spanning KAPPA KP30, KP35, and KP40 single, tandem, and triple pump assemblies.
In-house CNC machining and computerized testing. High-precision CNC machining centers, automated gear grinding, single-piece assembly, and 100% computerized hydraulic bench testing verifying flow, pressure, and leakage before shipping.
Fleet replacement coverage. Complete replacement pump coverage across leading global construction equipment brands, allowing operators to streamline fleet hydraulic procurement with a single dependable supplier.
One-year warranty and global support. Full one-year warranty on all assemblies, backed by rapid technical assistance for installation and commissioning.
CASAPPA Hydraulic Pumps 799137H 799137GX 7993004W 799137H0 85824395 High-Pressure Oil Pump KP35 KP40 KP30 Hydraulic Gear Pump is a heavy-duty, fixed-displacement cast iron external gear pump engineered for demanding mobile machinery and industrial hydraulic systems. Available in single-pump and Group 3+3 double-pump configurations with optional integrated priority/relief valves, this series features a robust cast iron housing, precision-machined gears, and pressure-balanced thrust plates. Engineered for seamless OEM replacement on New Holland, Case, and FIAT KOBELCO backhoe loaders and tractors, it delivers high volumetric efficiency, steady fluid delivery, and long service life under high operating pressures.
| Applications
These CASAPPA cast iron external gear pumps are widely deployed across construction machinery (backhoe loaders, wheel loaders, mini and medium excavators), agricultural equipment (tractors, harvesters, balers), material handling equipment (forklifts, telehandlers), municipal utility vehicles, and heavy-duty industrial hydraulic power units. They reliably power main working hydraulics, auxiliary circuits, steering systems, and attachment lifting mechanisms under continuous high-load operating cycles.
| Technical Specifications
| Parameter | Specification |
|---|---|
| Brand | CASAPPA |
| Series | KP30 / KP35 / KP40 Series (Kappa Cast Iron) |
| OEM Cross Reference | 799137H, 799137GX, 7993004W, 799137H0, 85824395 |
| Product Type | Cast iron external hydraulic gear pump (single pump / Group 3+3 tandem pump) |
| Housing Material | High-strength cast iron |
| Displacement Range | 19.5 ~ 82 cm³/rev (configurable by OEM part number) |
| Rated / Continuous Pressure | 200 ~ 250 bar (max. continuous up to 285 bar) |
| Max. Peak Pressure | Up to 330 bar (4785 psi) |
| Max. Speed | Up to 3500 ~ 4000 min⁻¹ |
| Rotation Direction | Clockwise (D), Counter-clockwise (S), Reversible (R) |
| Volumetric Efficiency | 92 ~ 96% (typical, series) |
| Mounting Flange | SAE / European standard 4-bolt flange |
| Drive Shaft | Splined, keyed parallel, or tapered shaft (per OEM configuration) |
| Port Connections | Threaded (BSPP/SAE) or SAE split flange |
| Working Fluid | Mineral hydraulic oil (HLP / HM, ISO VG 32 ~ 68) |
| Operating Temperature | -20°C ~ +80°C |
| Compatible Equipment | Case 580 / 590 / 695 backhoe loaders, New Holland LB115 / LB115.B / LB115CP loaders, FIAT KOBELCO machinery |
| Model Cross Reference & Configurations
| Part Number | Pump Type | Built-in Valve | Approx. Weight |
|---|---|---|---|
| 799137H | Cast iron external gear pump | Optional | Per configuration |
| 799137GX | Tandem double pump (Group 3+3) | Yes (with valve) | approx. 33.0 kg |
| 7993004W | Tandem double pump (Group 3+3) | Yes (with valve) | approx. 33.0 kg |
| 799137H0 | Tandem double pump (Group 3+3) | Standard | approx. 33.5 kg |
| 85824395 | Cast iron external gear pump | Standard | Per configuration |
799137GX
799137H
799137H0
799137GY
7993004W
85824395
85824395R
85826148
85826149
85817699
87362336
79914144
79933052
KP30.34-05S6-LMF/0D-M5-KSL/30
KP30.38-05S6-LMF-00-M5-KSL-30
KP30.43-A8K9-LMD/MC
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