Service Kit Instructions
Series 42
Manual displacement control (MDC) replacement
PURPOSE:
Themanualdisplacementcontrol(MDC)providescontrolof thepumpservopistonthroughaconnectiontothesumming link pin within the pump housing. The following procedure shows how to remove and install the control assembly.
PROCEDURE:
1.Clean the external surfaces of the pump. If necessary, remove the MDC handle.
2.Remove the seven (7) control retaining screws [Torx T30] that secure the control to the pump housing. Remove the control and control gasket from the pump.
3.Clean the sealing surfaces of the control and the pump housing. Place a new gasket in position on the housing.
CAUTION
The control orifices are part of the control gasket. Refer to the appropriate Service Parts List to determinethecorrectgasket.
4. Hold the summing link pin in position while installing the control. (The spring on the control spool will tend to push the link to an extreme position.) The link pin MUST engage the slot in the control cam. A plug is provided on the MDC housing to permit visual inspection of linkage pin engagement.
Note: It may be easiest to lay the servo piston side of the controldownfirst,asshowninthephoto,thenwatch thelinkpinengagefromthechargepumpsideofthe pump.
5.Install the control screws and torque to 15-17 Nm (1113 ft lbf).
6.Perform Control Neutral Adjustment as outline in the Series42ServiceManual(BLN-10093)
WARNING
Failure to properly engage the link pin with the controlcamwillresultinincorrectcontroloperation, which may lead to loss of control of the vehicle/ machine.
|
Nut |
|
Lock Washer |
Plug for |
MDC Handle |
Visual |
|
Inspection |
|
Control |
|
Retaining |
|
Screws |
|
Control |
|
Gasket |
|
Hold summing link |
|
(and control spool) |
|
in position |
|
MDC Assembly
Summing link pin MUST enter the slot in the control cam!
Link Pin Into Cam Slot
© Danfoss, 2013 |
BLN-10114 • Rev AA • September 2013 |
1 |
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