7. Set the NSS cam (D037) in the proper orientation (I, II, or III). See the illustration on previous page.
NSS assembly on MDC
8. Thread the alignment tool into the NSS cavity to hold the cam in place.
9. Install the nut (D038) onto the cam and torque to 6 N•m [4.4 lbf•ft].
10. Using an appropriate press, press a new cover (D039) into the cam cavity. Use a tool with a diameter
of 23.3 mm [0.916 in]. Press the new cover so that it sits 1 mm [0.04 in] below the cast surface as
illustrated above.
11. Remove the alignment tool and locking pliers.
12. Lubricate and install a new O-ring on the NSS (D040) and install the NSS to the MDC. Torque to 27
N•m [20 lbf•ft].
13. Reinstall the MDC module onto the pump housing as shown on pages 35 and 36.
MDC Solenoid override valve
The solenoid override valve is a safety feature that shunts both ends of the servo control piston when the
solenoid is de-energized. The pump will stroke only when the vehicle controls energize the solenoid.
The solenoid override with brake release option allows hydraulic control of a spring-applied,
hydraulically-released brake. When de-energized, the brake drains through port X7.
Service Manual
Series 42 Axial Piston Closed Circuit Pumps
Minor Repair
520L0638 • Rev 0300 • July 2015 49
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