ALUMINUM CENTER HOUSING
• Standard duty cycle
• Reduced weight
• Smaller housing
CAST IRON CENTER HOUSING
• High duty cycle
• Use in circuits with motors
• Better at higher temperatures
• Increased wear resistance
• Higher flows
• Simplified hose connections
• Higher flows at reduced engine rpm
as compared to other PTO pumps
Prince PTO pumps are specifically designed for PTO drive operation on all sizes of farm tractors. No additional gearbox is required.
Pumps are mounted by sliding the internally splined pump onto the PTO splined shaft and restraining rotation with a torque arm.
SELF ADJUSTING WEAR PLATES
Prince PTO pumps have self-adjusting wear plates that seal around the two unequal size gears. These plates, activated by internal fluid pressure, offset wear or expansion.
The pump must be used in a clean system with clean oil. The fluid cleanliness should meet the ISO 4406 17/14 level. As a minimum, 10 micron filtration is recommended.
A good quality mineral base hydraulic fluid with a viscosity in the 70-250 SUS range at operating temperature is recommended.
Oil operating temperature should not exceed 180°F. If it does, the reservoir may be too small or a heat exchanger may be needed.
Prince PTO pumps are designed to operate at up to 110% of standard PTO shaft speeds. Standard speeds are 540 rpm for the 6 tooth shaft and 1000 rpm for the 21 tooth shaft.
• CLOSE RUNNING CLEARANCE FOR
HIGH FLOW RATE
Another feature that contributes to the excellent and long-lived efficiency of the PTO-Series pump is the minimum clearance between the gears and the center housing. Each pump is assembled with zero clearance between the housing and the tips of the gear teeth, then test run until the teeth establish a proper wear path in the housing. The result is a much tighter clearance than found in traditional pumps.
• PRESSURE RATING
Pumps are designed for 2250 PSI max. relief valve setting. A relief valve, external to the pump, must be provided in the system.
All pumps are provided with an inlet port adapter (SAE O-ring boss to hose barb) and outlet port adapter (SAE O-ring boss to female pipe thread) sized appropriately for the ports and required line sizes. A steel plug is provided for the second outlet port.
As a guideline, a reservoir size in gallons should equal the pump output in gallons per minute. A larger reservoir and/or an oil cooler may be needed for high duty cycle applications.