Control forces of hydraulic piston pump

[Ken.Li]

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps.
But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a
spring is used to make the control shaft of a pump return to its neutral position.
Totally the torque to actuate a pump is over 100In-lbs.
So the effort applied on the foot pedal to actuate two pumps is much more I expected.
Can someone tell me any ways to reduce the effort on the foot pedal?
Many thanks.

 

[drankin]

We are designing a foot pedal mechanism to actuate two hydraulic pistion pumps.
But the torque to actuate a pump is more than 50In-lbs at full stroke. In addition, a
spring is used to make the control shaft of a pump return to its neutral position.
Totally the torque to actuate a pump is over 100In-lbs.
So the effort applied on the foot pedal to actuate two pumps is much more I expected.
Can someone tell me any ways to reduce the effort on the foot pedal?
Many thanks.

Please describe the piston pumps, fluid to be pumped, and application. The way I read your post, you want to rotate the pumps that are pumping a fliud by pushing down on a pedal? Like a bicycle pedal?