About the Attachment Section 2 Page 7
MSD SABER SERIES SHEARS
FLOW AND PRESSURE REQUIREMENTS
The following table prvodes the MSD Saver Series Mobile Shear fl ow and pressure requirements for the open and close
function. Please note that all models include speed valves; also note that these calculations are theoretical and that actual
cycle times will vary depending upon the specifi c excavator’s hydraulic effi ciency, possible back pressure in the system,
operator competency, etc. These cycle times are calculated with not material in the jaws. The cycle times will be longer
when maximum shear force is required (shear will go out of “speed valve mode”).
SHEAR
MODEL
RECOMMENDED
PRESSURE RANGE
REQUIRED FLOW (GPM) TO MEET
8, 10, 12, AND 14 SECOND CYCLE TIMES
8 SEC 10 SEC 12 SEC 14 SEC
MSD 1000
4000 - 5500 PSI
(276-379 BAR)
50 40 -- --
MSD 1500 60 48 40 --
MSD 2000 110 90 70 60
MSD 2500 150 130 110 94
MSD 3000 160 140 120 103
MSD 4000 -- 170 150 128
MSD 4500 -- 175 150 128
MSD 7500 -- 241 201 172
MSD 9500 -- 350 292 250
NOTICE
• Rotation Circuit - 8-12 GPM @ 2000 - 2500 PSI. A 1/2" case drain line going from the hydraulic rotation
motor to the excavator’s hydraulic tank is required to relieve back pressure.
• Pump summation or dual pump fl ow is recommended for shear munting second-member on most
excavators. Due to the increase in fl ow, there may be a requirement to add larger hydraulic lines or dual
lines up the boom to minimize back pressure, reduce heat and maximize shear performance.
