KB21 Service Manual Pub 09-14
74
Cylinder Control Systems
40-B. Bucher L.8S - Electric Control/Cable
Valve Spool Functions & Specs
In the Chart Cycle Times listed above are close approximations of actual times based on machine testing,times
indicate the time for the cylinder to travel the full amount of its extension or retraction. The lift times up and down
All Cycle times are mea-
sured at the rated Tractor RPM. Test Times should be close to above but can vary some from unit to unit; Times
listed are a guide to show approx. what Cycle
times for tour Unit should be.
Valve Leakage: Maximum internal Valve Leakage from the Cylinder. Ports to Tank at any Valve Segment,Oil
Pressure at 1450 PSI and Oil Viscosity at 102 SSU = 1.25 Cubic Inch / Minute
Standby (Pilot) Pressure: Standby (Pilot) Pressure = 200 to 250 PSI.
Dash Size Nominal Cyl. Size
(in)
Torque in.lbs. Torque
ft.lbs.
-4 1/4” 140 12
-6 3/8” 230 19
-8 1/2” 450 38
-10 5/8” 650 54
-12 3/4” 900 75
-16 1” 1200 100
-20 1-1/4” 1600 133
-24 1-1/2” 2000 167
-32 2” 2800 233
Hose End Type: 37 Degree Angle End Steel Hose End Fitting
*Note: Straight threads do not always seal better when higher
torgue are used. Too much torque causes distortion and may
installing them.
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