Marzocchi pumps GHP1A-D-8-FG,ALP2A-D-25-FG

General Introduction

1. Model Nomenclature Explanation

1.1 GHP1A-D-8-FG Model Nomenclature

• GHP: High-pressure external gear pump series, designed for continuous high-pressure operation (up to 250 bar), superior pressure resistance vs. ALP series.
• 1A: Size group (GHP1), displacement range 1–10 cm³/rev, compact dimensions for small-flow systems.
• D: Flange mounting, rigid installation with minimal vibration.
• 8: Displacement code (theoretical displacement = 7.8 cm³/rev).
• FG: Special options – F = integrated pressure relief valve (overload protection); G = mechanical seal (high-pressure, leak-proof).

1.2 ALP2A-D-25-FG Model Nomenclature

• ALP: Standard-pressure external gear pump series, aluminum alloy body, cost-effective for medium-pressure systems.
• 2A: Size group (ALP2), displacement range 9–34 cm³/rev, balanced flow-pressure performance.
• D: Flange mounting, European standard 4-hole interface.
• 25: Displacement code (theoretical displacement = 17.9 cm³/rev).
• FG: Special options – F = pressure relief valve; G = mechanical seal (long service life, -10°C to +80°C).

2. Basic Information

3. Key Technical Specifications

4. Material & Construction

GHP1A-D-8-FG

• Body/Covers: High-strength aluminum alloy, reinforced flanges for high-pressure rigidity.
• Gears: Case-hardened steel, precision-ground, minimal backlash, low leakage.
• Bearings: Bronze bushings with pressure-compensation, high load capacity.
• Seals: Mechanical seal (G) + NBR gaskets, leak-proof under 250 bar continuous.

ALP2A-D-25-FG

• Body/Covers: Lightweight aluminum alloy, die-cast, good thermal dissipation.
• Gears: Hardened alloy steel, optimized tooth profile, low noise.
• Bearings: Self-lubricating bushings, long service life at standard pressure.
• Seals: Mechanical seal (G) + FKM washers, reliable across temperature ranges.

5. Shaft & Mounting Dimensions

GHP1A-D-8-FG

• Shaft: Taper 1:8, key 4×4 mm, thread M12×1.25.
• Shaft Ø: 18 mm; shaft length: 40 mm; pilot Ø: 45 mm.
• Mounting: 4-hole flange, bolt circle Ø90 mm, M6 bolts.
• Max torque: 160 Nm; tightening torque: 60±5 Nm.

ALP2A-D-25-FG

• Shaft: Taper 1:8, key 5×5 mm, thread M12×1.25.
• Shaft Ø: 20 mm; shaft length: 42 mm; pilot Ø: 50 mm.
• Mounting: 4-hole flange, bolt circle Ø96 mm, M8 bolts.
• Max torque: 320 Nm; tightening torque: 70±5 Nm.

6. Port Specifications

7. Product Features

Common Features

• High Efficiency: Precision gear sets, low internal leakage, consistent output.
• Low Noise: Optimized gear meshing, rigid body, reduced pulsation.
• Overload Protection: Integrated pressure relief valve (F) prevents system damage.
• Long Life: Quality materials, robust bearings, mechanical seal (G).
• Easy Maintenance: Standardized parts, simple service, compact layout.

GHP1A-D-8-FG Unique

• High Pressure Rating: 250 bar continuous, ideal for compact high-pressure circuits.
• Small Flow Precision: Stable low-flow output for precision controls.
• Compact Footprint: Fits narrow installation spaces.

ALP2A-D-25-FG Unique

• Balanced Performance: 210 bar / 26 L/min, cost-effective for general industry.
• Lightweight: Aluminum construction, easy handling.
• Wide Compatibility: Matches standard industrial hydraulic systems.

8. Application Fields

GHP1A-D-8-FG

• Precision hydraulic systems (test benches, small actuators)
• Mobile equipment (small lifts, agricultural attachments)
• Industrial machinery (packaging, clamping units)
• High-pressure auxiliary circuits

ALP2A-D-25-FG

• Industrial hydraulic power units
• Machine tools (presses, conveyors)
• Construction machinery (small excavators, loaders)
• Material handling, lift systems
• General factory automation

9. Installation Instructions

General Requirements

• Mount on rigid base; align motor-pump shaft (coaxiality ≤0.1 mm) to avoid vibration.
• Suction line: tight seals, diameter ≥ pump inlet, length ≤1.5 m, height ≤500 mm.
• Use clean, filtered hydraulic oil (ISO 4406 cleanliness class 18/15 or better).
• Prime pump before first start: fill inlet chamber with oil to prevent dry running.

GHP1A-D-8-FG (Flange Mounting)

• Secure flange with 4×M6 bolts, torque 60±5 Nm.
• Connect suction/pressure lines; use bonded seals to prevent leaks.
• Rotate shaft manually to confirm smooth rotation.

ALP2A-D-25-FG (Flange Mounting)

• Secure flange with 4×M8 bolts, torque 70±5 Nm.
• Ensure proper alignment; use flexible coupling if misalignment exists.
• Check all connections for tightness before startup.

10. Operation Instructions

• Before startup: check oil level, vent air from system, open all valves.
• Idle run: operate 2–3 minutes at low pressure (<50 bar); check noise, leaks, temperature.
• Gradually increase pressure to working level; confirm relief valve functions correctly.
• Operating limits: do not exceed max pressure/speed; monitor housing temp (<80°C).
• Shutdown: reduce load to zero, stop motor, close isolation valves.

11. Maintenance & Troubleshooting

Routine Maintenance

• Oil change: Every 2000 operating hours; replace filter element.
• Seal check: Every 1000 hours; replace mechanical seal if leaking.
• Bolt torque: Re-tighten mounting/port bolts every 500 hours.
• Inspection: Check gear/bearing wear every 3000 hours.

Common Faults & Solutions

12. Notes

• Parameters apply to standard configurations; custom specs may vary.
• Do not operate outside rated pressure/speed limits.
• Use recommended oil viscosity; avoid contaminated/old fluid.
• Disconnect power and relieve pressure before maintenance.
• Store in dry, cool place; seal ports to prevent contamination.
• Contact Marzocchi service for unresolved issues.

13. Warranty Information