Replacement Pump On NH Sicklebar
"The sicklebar on our New Holland 1475 16-ft. haybine is powered by a 1,000 rpm pto-driven 30 gpm hydraulic pump running at 3,000 psi. The pump attaches to a pto coupler, which hooks up to the tractor pto. On Deere tractors especially, the pump tends to vibrate too much at the high 1,000 rpm speed.
"I solved the problem by replacing the New Holland pump with a Prince 40-gpm pump that runs at the 1,000 pto speed with 2,500 psi capacity. The itself pump fits right over the pto shaft, eliminating the vibration problem. I lowered the hydraulic oil pressure by backing off the bypass valve on the cutter one quarter turn. The cutter performs adequately and the compromise protects the pump, which is not rated for over 2,500 psi operation. I also had the holes for the torque bar mounted on the pump tapped to 1/2-in. bolts instead of the standard 3/8-in. bolts for better reliability. A second advantage is that to pump 30 gal. per minute the pump only has to operate at 3/4 speed û 750 rpm's on the pto and 1,575 for the tractor. No need to run the tractor at full rpm's. The Prince pump cost $400 and has served two seasons with no problems."
Contact: FARM SHOW Followup, J. Blaine Runner, 89641 Runner Road, Ashby, Neb. 69333 (ph 308 458-2267).
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Replacement Pump On NH Sicklebar MISCELLANEOUS EQUIPMENT Pumps 29-1-38 "The sicklebar on our New Holland 1475 16-ft. haybine is powered by a 1,000 rpm pto-driven 30 gpm hydraulic pump running at 3,000 psi. The pump attaches to a pto coupler, which hooks up to the tractor pto. On Deere tractors especially, the pump tends to vibrate too much at the high 1,000 rpm speed.
"I solved the problem by replacing the New Holland pump with a Prince 40-gpm pump that runs at the 1,000 pto speed with 2,500 psi capacity. The itself pump fits right over the pto shaft, eliminating the vibration problem. I lowered the hydraulic oil pressure by backing off the bypass valve on the cutter one quarter turn. The cutter performs adequately and the compromise protects the pump, which is not rated for over 2,500 psi operation. I also had the holes for the torque bar mounted on the pump tapped to 1/2-in. bolts instead of the standard 3/8-in. bolts for better reliability. A second advantage is that to pump 30 gal. per minute the pump only has to operate at 3/4 speed û 750 rpm's on the pto and 1,575 for the tractor. No need to run the tractor at full rpm's. The Prince pump cost $400 and has served two seasons with no problems."
Contact: FARM SHOW Followup, J. Blaine Runner, 89641 Runner Road, Ashby, Neb. 69333 (ph 308 458-2267).
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