Frame size Lock nut wrench size and torque Adjusting screw
wrench size
internal hex
Approximate displacement change
per revolution of adjusting screw
042 13 mm 24 N•m [18 lbf•ft] 4 mm 3.5 cm³/(rev) [0.21 in³/rev]
055 13 mm 24 N•m [18 lbf•ft] 4 mm 4.2 cm³/rev [0.26 in³/rev]
075 13 mm 24 N•m [18 lbf•ft] 4 mm 5.1 cm³/rev [0.31 in³/rev]
100 13 mm 24 N•m [18 lbf•ft] 4 mm 6.2 cm³/rev [0.38 in³/rev]
130 17 mm 48 N•m [35 lbf•ft] 5 mm 8.8 cm³/rev [0.53 in³/rev]
180 19 mm 125 N•m [92 lbf•ft] 6 mm 12.5 cm³/rev [0.76 in³/rev]
250 19 mm 125 N•m [92 lbf•ft] 6 mm 17.3 cm³/rev [1.06 in³/rev]
The servo cylinders are equipped with gage port X11 and X12. These ports provide the possibility to
connect the servo system of the pump to the system loop. This feature connects the high pressure lines
with the servo system over check valves and provides a smooth concrete flow.
Shaft Torque
Shaft torque and spline lubrication
The rated torque is a measure of tooth wear and is the torque level at which a normal spline life of 2x109
shaft revolutions can be expected. The rated torque presumes a regularly maintained minimum level of
lubrication via a moly-disulfide grease in order to reduce the coefficient of friction and to restrict the
presence of oxygen at the spline interface. It is also assumed that the mating spline has a minimum
hardness of Rc 55 and full spline depth. The rated torque is proportional to the minimum active spline
length.
Maximum torque ratings are based on torsional fatigue strength considering 100.000 full load reversing
cycles. However, a spline running in oil-flooded environment provides superior oxygen restriction in
addition to contaminant flushing. The rated torque of a flooded spline can increase to that of the
Technical Information
Series 90 Axial Piston Pumps
Features and Options
520L0603 • Rev 0804 • March 2016 43
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