Pump Neutral Adjustment - Danfoss MCV105C Manual

MOUNTING
2. Remove the bolt under the handle of the manual control.
Lift off the handle, rotary spool and spring and bracket
assembly. Use a vise grip to pull the old sleeve out of the
pump. Remove the two pipe plugs from the pressure
and return ports. Remove the inlet orifice in the pressure
port.
If there is no manual control:
1. The EDC is shipped with an attached spool and sleeve
assembly. Remove the sleeve from the valve. With the
notch in the sleeve facing down and toward the pump
shaft, place the sleeve in the pump valve bore until the
attached snap ring bottoms out. See Sleeve Placement
On Pump, below.
2. If there are caps over the pump's pressure and return
ports, take them off.
3. Ensure O-rings are in place. See EDC O-Ring Place-
ment, below.
SLEEVE PLACEMENT ON PUMP
Sleeve placement on the pump.

PUMP NEUTRAL ADJUSTMENT

Use the following procedure to bring the pump to neutral
once the Electrical Displacement Control has been
mounted.
1. Install a 300 psi gauge in each servo pressure gauge port
on the pump. See Location, Servo Gauge Port, page 11.
2. Using a 9/16-inch wrench, loosen the hex lock nut on the
null adjustment screw. See Dimensions, page 6.
© Danfoss, 2014-05
4. With extreme caution, guide the EDC spool into the
sleeve in the pump until the EDC's four bolt holes are
properly aligned to the pump mounting holes. There is
only one possible alignment.
Note: Any damage or nicks to the spool while installing
could cause control to bind and produce erratic results.
5. Put the 2 short screws (1/4-20 x 3/4") through the bosses
on the side of the valve. Put the two long screws (1/4-20
x 2.5") through the valve body. See Dimensions, page
6. Torque the four screws, in a cross pattern starting with
the bolt closest to the pilot, to 10-11 ft. lbs.
Note: Improper torqueing may cause control to bind and
produce erratic results.
6. If needed, install control orifices under both servo
covers.
EDC O-RING PLACEMENT
1355A
Electrical Displacement Control o-ring placement.
To adjust neutral requires operating the pump. Take the
necessary safety precautions such as having unneces-
sary personnel stand away from the machine. Maximum
system pressure may occur upon start up, and the
machine may move. Ensure that the operator is not in a
position to be injured should the machine move.
11152452 • Rev AA • May 2014
WARNING
1356A
10