This document serves as a comprehensive repair manual for Poclain Hydraulics PM series hydraulic pumps, intended for machine manufacturers who integrate these products. It outlines the processes for repairing these products after the warranty period, emphasizing safety, quality, and proper maintenance procedures.
Function Description:
The Poclain Hydraulics PM series pumps are hydraulic units designed for integration into various machines. They are responsible for generating and controlling hydraulic power within a system. The manual details the disassembly, reassembly, and adjustment of various pump components, including the flushing system, charge pressure relief valve, high pressure relief valves, charge pump, and hydraulic servo control. The pump's operation involves a rotating group, swash plate, pistons, and a valve plate, all working in conjunction to deliver hydraulic fluid under pressure. The servo control system allows for precise adjustment of the pump's output, including mechanical neutral adjustment. The flushing system ensures proper lubrication and cooling of internal components, while the charge pump provides boost pressure to the main pump.
Important Technical Specifications:
While specific technical specifications like displacement or pressure ratings are not explicitly detailed for a particular PM model, the manual provides general guidelines and references to a "Technical catalog PM10" (A35766B) for detailed product information. Key adjustable parameters mentioned include:
- Charge pressure relief valve setting: This can be 00 (without valve), 20 bars (for servo control S), or on demand (max 30 bar). The adjustment procedure involves turning the pump at 1200 rpm and adjusting the setting screw to achieve the desired pressure (typically 20-22 bar at 50°C oil temperature).
- Tightening torques: A detailed table of tightening torques for various components is provided, ranging from 5 to 75 Nm (3.70 to 55.3 lbf.ft). These torques are crucial for ensuring proper assembly and preventing leaks or damage.
- Mechanical neutral adjustment: This adjustment ensures no clearance in the spring box, which is critical for the correct functioning of the servo control.
- Filtration: The manual references "Filtration F2" and "Filtration F0" kits, indicating the importance of proper fluid filtration for pump longevity.
Usage Features:
The PM series hydraulic pumps are designed for integration into machines where precise hydraulic power is required. The manual implicitly highlights features related to:
- Adjustable output: The servo control system allows for variable displacement, enabling the pump to adapt to different operational demands.
- Robust construction: The detailed disassembly and reassembly procedures suggest a design that allows for component replacement and repair, extending the service life of the pump.
- System integration: The pump is intended to be part of a larger hydraulic system, with connections for suction, pressure, and control lines.
- Safety mechanisms: The presence of charge pressure and high pressure relief valves indicates built-in safety features to protect the system from overpressure.
Maintenance Features:
The manual is primarily a maintenance guide, focusing on repair and reassembly. Key maintenance features include:
- Troubleshooting guide: A comprehensive table helps diagnose common issues like low flow, bad receiver speed, excessive heat, and excessive noise, linking them to potential causes and remedies.
- Detailed disassembly and reassembly instructions: Step-by-step procedures with accompanying images guide technicians through the process of taking apart and putting back together various pump components. This includes marking component positions before disassembly to ensure correct reassembly.
- Component identification: Instructions for identifying the pump using its product identification plate (part number, serial number, manufacturing date) are provided, crucial for ordering correct spare parts.
- Spare parts list: A generic list of spare parts, organized by "Kit" (e.g., shaft seal kit, rotating group kit, charge pump kit, hydraulic servo control kit, seals kit), is provided with corresponding item numbers and descriptions in both French and English. Exploded views further aid in identifying parts.
- Emphasis on genuine parts: The manual explicitly states, "Use only Poclain Hydraulics genuine spare parts. Using parts from different sources could reduce the performance of the product and create a safety hazard."
- Safety and quality guidelines: Strict adherence to safety instructions (e.g., "Be careful at the pistons fall down during the removal," "Do not overset relief valves") and quality procedures (e.g., working in a clean area, using appropriate tools, lubricating components) is emphasized throughout the manual.
- Fluid management: Instructions for bleeding air from the circuit, filling the tank to the normal level, and replacing fluid highlight the importance of proper hydraulic fluid maintenance.
- Specialized tools: The use of specific tools like snap ring pliers, mallets, bronze tools, and Teflon tools is mentioned for certain procedures, indicating the need for appropriate equipment for effective maintenance.
- Warranty information: The document is specifically for repairs "after the warranty period," implying that opening the products voids the warranty contract.
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