Replacement Parts Sheet
3500 Annapolis Lane North, Minneapolis, MN 55447 • Phone: (763) 509-2084 • FAX: (763) 559-0108
Service for the MCV115 HDC, Series 90 PV
This procedure covers the proper removal and installation of those internal piece parts as outlined in the following steps. (See Figures 1 and 2 for reference).
1.Remove the HDC from the pump, use a 5 mm socket hex head and place it on a firm surface with the internal workings facing up.
2.Locate the neutral adjust nut. Use an 11/16 hex wrench, back out the neutral adjust assembly all the way and remove from body. Be careful not to disturb the locknut. This will help ensure a positive pump neutral when reinstalling this assembly.
3.Lift link/main adjust assembly away from housing. The slider block may drop away from the link pin. Also, the spring(s) in the housing should stay in place (30/55 cc, one spring only; 75/180 cc, two springs).
4.Locate the large snap-ring. The cavity above the snapring should be cleaned of debris. Tap lightly with a hammer on the plug below the snap-ring. This will relieve the force when removing the snap-ring.
5.Using a snap-ring pliers, remove the snap-ring. Place a blade screw driver under the lip of the plug and apply an outward force at several points until plug is removed. This will expose the Spool/Barrel Assembly (SBA). Now place the HDC on end and grab hold of the two hex nuts that are part of the SBA and pull out of housing.
6.Reassemble with the HDC on end. Gently lower the new SBA into housing. If the SBA becomes stuck GENTLY tap into place.
7.Install new plug and snap-ring. All SBAs are shipped with new plugs indicating the pressure range which is stamped on the outside of the plug. Be sure that plugs
stay with their respective SBA, as this is the only means of identifying the SBA pressure range.
8.Re-assemble the slider block onto the link pin as shown. Place the link/main adjust assembly into the housing while positioning the slider block flats into the barrel slot.
9.Install the neutral adjust assembly, making sure that the spring(s) fall in place. While threading the neutral adjust assembly into the housing, it will be necessary to assist the main adjust by applying force in the direction as shown. Keep applying this force while installing the main adjust assembly until the O-ring contacts the housing. Torque the main adjust nut to 30 ft·lb.
10.To ensure proper assembly, hold the feedback pin and move side-to-side. It should move freely from stop to stop, approximate.y 1/8 inch, before spring force is felt.
11.To install new control, align feedback pin to pump link. Then carefully lower control onto pump.
12.Before installing mounting screws, check that control is completely down on gasket. Install mounting screws and tighten to 10 to 12 ft·lb.
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To adjust neutral requires operating the pump. Take the necessary safety precautions. If the linkage is not properly engaged maximum system pressure may occur upon start up, and the machine may move. Ensure that all personnel are not in a position to be injured should the machine move. The EDC neutral position is critical to ensure no machine movement upon start-up. Ensure lock nut is tight (10 ft·lb).
HYDRAULIC DISPLACEMENT CONTROL (HDC)
PRESSURE
RANGE
STAMPING
SNAP RING
PLUG
* Note: The pressure range is called out in the last two digits of the HDC P/N.
1923
Figure 1.
RP-9601M |
Date: January 10, 1996 |
K20984 1 © Copyright 2000, Sauer-Danfoss (US) Company. All rights reserved. Contents subject to change.
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