Parker’s 051 series fixed/positive displacement commercial gear pumps offer high durability & resistance to oil contamination due to their cast iron, roller bearing construction making them an ideal selection for the Vocational Truck, Winch, and Oil & Gas markets. They are available as single, or multi-section pumps with an integral valve. View all gear pump components, markets served, and technical specifications below:
            
Markets:
• Aerial
• Agriculture Machinery
• Construction Equipment
• Forestry Equipment
• Material Handling
• Turf Equipment
• Vocational & Municipal Equipment
• Mining
• Oil & Gas

Features/Benefits:
• Three-piece cast iron construction for distribution flexibility
• Cast Iron construction for durability
• Balanced Thrust Plates minimize friction and leakage
• Roller bearings for durability
• Multiple sections available

Applications:
• Tire Trucks
• Salt and sand spreaders
• Aerial Lift
• Roll Off Truck
• Moving Floor Truck
• Refuse Truck
• Oil & Gas Service Trucks

Technical Specifications:
• Flow range to 63 gpm (238.5 lpm) per section
• Displacements from 1.275 to 6.375 cir (21 to 105 cc/rev)
• Operating pressures up to 200 bar (3,000 psi)
• Speeds up to 2,400 rpm
• Volumetric efficiencies up to 95%
• CW, CCW, and Bi-rotational pumps available
• SAE and SI shafts, flanges and porting available
• Multiple section
• Extensive integrated valve capabilities
    - Relief with anti-cavitation check
    - Priority flow control  
    - Unloader valves
    - Accumulator charge (single and dual)    
    - Two-speed valves (winches, ground drives)
    - Load sense priority flow divider (bolt-on)
    - Dry valves, HOC™ (hydraulic overspeed control), flow controls
    - Crossover relief valves