Danfoss MCV109A Manual page 10

PARTS LOCATION DRAWING
LINKAGE
ASSEMBLY
OPTIONAL ORIFICES (2)
SWASHPLATE FEEDBACK
SHAFT HOLE
MOTOR NEUTRAL ADJUSTMENT
Each MCV109 is factory calibrated so that the motor will
begin to destroke from 18° at the specified threshold input
current (see Technical Data section) to 6° which is full
destroke. This setting should not require adjustment.
If for some reason adjustment of neutral is necessary, a turn
of the null adjustment screw will vary the current/swashplate
MOTOR THRESHOLD ADJUSTMENT
Use the following procedure to bring the hydraulic motor to a
threshold setting. The procedure describes "stages" of the
transmission, so that the motor starts to destroke just as the
pump reaches full stroke. This ensures a smooth, continuous
rise in motor shaft speed as command increases.
If a tachometer is unavailable, or if for some other reason the
following procedure is impractical, similar results can be
obtained by running the machine at different MCV109A
threshold adjustments. There should be no "dead spots" in
which increased command gives no increased speed. Nor
should there be spots in which increased command gives a
faster rise in speed than at high and low command extremes.
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
WARNING
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 1 2 3 4 5 6 7 8 9 0 1 2 3
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.
1. Disconnect the wires connecting the EDC pilot of the
MCV109 EDC-MV on the motor.
2. Install a mechanical or photoelectric tachometer on the
output shaft of the hydraulic motor.
CROSSLINK
BALL
CAVITY
BUSHING
RETAINING
RING
1858
Location of Parts When Installing a New Link and Ball Assembly. Separate
Assembly Parts Shown for Information Only; Do Not Attempt to Disassemble.
angle curve (see Performance Curve diagram) vertically. A
clockwise turn will reduce the angle at which the swashplate
begins to destroke from 18° to a smaller angle. Physical
stops prevent the motor from destroking below 6°. A counter-
clockwise turn increases the fully-destroked angle above 6°.
Physical stops prevent the swashplate from exceeding 18°.
3. Run the EDC electrical (or HDC-PV hydraulic) com-
mand source to maximum.
4. Slowly reduce the command source until the motor shaft
starts to decrease speed as shown by the tachometer.
This point represents full pump output. Note the RPM
indication level on the tachometer. Note the command
source position and the engine speed.
5. Reconnect the wires to the EDC-MV. Re-start the hydro-
static transmission. Using a 9/16-inch wrench, loosen
the hex lock nut on the null adjustment screw.
6. Using a 3/16 inch internal hex wrench, slowly turn the
null adjustment screw counterclockwise until the ta-
chometer indicates the full pump output from Step 4.
(Note: Clockwise null adjust rotation increases shaft
output speed.) Then turn the screw clockwise until shaft
speed just starts to increase.
7. Hold the adjustment screw and securely tighten the hex
lock nut on the adjustment screw to 14-18 foot-pounds.
8. Run the system briefly to ensure that it operates propor-
tionally. Swashplate movement can be verified by watch-
ing movement of the swashplate feedback shaft, shown
in Parts Location Drawing.
10
1237B