Sauer Danfoss 51 Series Service Manual page 28

Bent Axis Variable Displacement Motors
Component Adjustment (Continued)
Fig. 30-8 - Loosen Minimum Displacement
Limiter Lock Nut
Fig. 30-9 - Rotate Minimum Displacement
Adjusting Screw
Approximate Change in
Frame
Size
060
080
110
180
250
Min. Displacement
Frame Range
Size cc/Rev (in
060 12 to 29 (.73 to 1.77)
30 to 40 (1.83 to 2.44)
080 16 to 35 (.98 to 2.14)
36 to 54 (2.20 to 3.20)
110 22 to 46 (1.34 to 2.81 )
47 to 74 (2.87 to 4.52)
160 32 to 72 (1.95 to 4.39)
73 to 107 (4.45 to 6.53)
250 50 to 90 (3.05 to 5.49)
91 to 130 (5.55 to 7.93)
131 to 167 (7.99 to 10.19) M12x100 (3.94)
28
Minimum Displacement
Per Revolution
of Adjusting Screw
1.5 cc/Rev (.09 in3/Rev)
2.1 cc/Rev (.13 in3/Rev)
3.1 cc/Rev (.19 in3/Rev)
4.0 cc/Rev (.24 in3/Rev)
6.2 cc/Rev (.38 in3/Rev)
Screw Size
and Length
/Rev) mm (in)
3
M10x65 (2.56)
M10x80 (3.15)
M10x65 (2.56)
M10x80 (3.15)
M12x70 (2.76)
M12x80 (3.15)
M12x75 (2.95)
M12x90 (3.54)
M12x75 (2.95)
M12x90 (3.54)
Minimum Displacement Limiter Adjustment
The minimum displacement is set at the factory, and
the adjustment screw is covered with a tamper-
resistant cap
Care should be taken in adjusting displace-
ment limiters to avoid undesirable speed con-
ditions. The sealing lock nut must be retorqued
510000434
after every adjustment to prevent an unex-
pected change in operating conditions and to
prevent external leakage during unit operation.
NOTE: Changes in motor displacement can be de-
tected by providing a constant flow of fluid to
the motor, while maintaining the motor at
minimum displacement and monitoring the
motor output shaft speed. An increase in
displacement will result in a decrease in shaft
speed, while a decrease in displacement will
result in an increase in shaft speed.
To adjust the minimum displacement, first remove
51000045
and discard the cap covering the adjusting screw.
Using a 17 mm hex wrench for 060 and 080 frame
size motors or a 19 mm hex wrench for 110 through
250 frame size motors, loosen the lock nut retaining
the minimum displacement limiter adjusting screw.
Using a 5 mm internal hex wrench for 060 and 080
frame size motors or a 6 mm internal hex wrench for
110 through 250 frame size motors, rotate the adjust-
ing screw to limit the minimum displacement of the
motor.
Rotating the adjusting screw clockwise will increase
the minimum displacement of the motor, while rotat-
ing the adjusting screw counter-clockwise will de-
crease the minimum displacement.
For each full revolution, of the adjusting screw, the
displacement will change according to the accompa-
nying chart.
Different minimum displacements may require differ-
ent length adjusting screws. The various lengths are
shown in the accompanying chart.
After establishing the desired minimum displacement
setting, tighten the lock nut on the adjusting screw to
51 Nm (38 ft•lbsf) for 060 and 080 frame size motors
or 86 Nm (63 ft•lbsf) for 110 through 250 frame size
motors. Install a new tamper-resistant cap on the
adjusting screw.
Series 51
WARNING
30 - 6