(D010) and torque to 11 N•m [8 lbf•ft]. Install the summing link (D011). It may be necessary to rotate
the control spool so that the summing link fork engages the flats on the control spool.
4. Install the MDC, EDC or HC-EDC according to procedures on pages 35 through 38.
Servo piston linkage and control spool
Feedback link (D012) must
enter slot in servo piston
D010
4 mm Internal hex nut
Slot in neutral adjust link
(D013) must engage groove
in adjusting screw (D014)
Fork on summing link
(D011) must engage flats
on control spool (D090
D091
Backlash spring
D090
Control
spool
Internal parts shown with housing removed
MDC Neutral start / backup alarm switch
The Neutral Start Switch (NSS) prevents the engine and pump from starting when the pump control
handle is not in neutral. The NSS should be wired in series with the engine starting circuit. The switch
contact is closed at the control handle’s neutral position and opens when the control handle is rotated
1.5° to 2° from neutral.
The Backup Alarm Switch (BAS) closes when the control handle is in a reverse position. This switch is
normally wired in series with a backup alarm. The switch contact is open until the control handle is
rotated 2.6° to 3.75° in the reverse direction.
Warning
The control handle’s neutral position must conform to the pump’s neutral position for the NSS/BAS to
work effectively. See Control neutral adjustment for MDC and EDC/HC-EDC on page 33 for control neutral
adjustment.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
46 520L0638 • Rev 0300 • July 2015
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