Multi-Function Block - Sauer Danfoss 51 Series Service Manual

Bent Axis Variable Displacement Motors
Minor Repair and Replacement - Variable Motor (Continued)

Multi-function Block

Removal and Installation
Remove the external control assembly as described
in the instructions for the specific control.
Remove the four (4) screws (and washers for 060,
080, and 110 units) retaining the multi-function block
to the end cap with an 8 mm internal hex wrench (060,
080, and 110 units) or a 10 mm internal hex wrench
(160 and 250 units).
Remove the multi-function block from the end cap.
Remove the O-rings between the multi-function block
and the end cap, and the O-ring on the valve spool
sleeve.
The multi-function block is equipped with filter screens
in the passages between the block and the end cap.
Units with internal servo pressure supply have a filter
screen installed in the end cap passage leading to the
valve spool sleeve. These screens should be pressed
into position (with the rounded edge of the filter
screens facing "out") until they are flush to 2.0 mm
(0.08 in.) below the machined surface of the multi-
function block or end cap.
Units with external servo pressure supply have a plug
installed in the end cap passage leading to the valve
spool sleeve. This plug may be removed with a 2.5
mm internal hex wrench. When installing this plug,
torque to 2 Nm (18 in•lbsf).
Install a new O-ring onto the valve spool sleeve in the
end cap.
Install new O-rings onto the end cap.
Install the multi-function block onto the end cap, and
install the screws.
Torque the screws to 78 Nm (58 ft•lbsf) for 060, 080,
or 110 units, or to 110 Nm (81 ft•lbsf) for 160 or 250
units.
Reinstall the external control assembly as described
in the instructions for the specific control.
50 - 21
51000087
Fig. 50-111 - Remove
External Control (HS
Shown)
51000135
Fig. 50-113 - Remove
Multi-function Block
51000083
Fig. 50-115 - End
Cap O-Rings
Installed
51000137
Fig. 50-117 - Torque
Multi-function Block
Screws
Series 51
51000134
Fig. 50-112 - Remove
Multi-function Block
Screws
51000136
Fig. 50-114 - Multi-
function Block
Screens
51000135
Fig. 50-116 - Install
Multi-function Block
51000088
Fig. 50-118 - Install
External Control (HS
Shown)
71