Pump Neutral Adjustment - Danfoss MCV104A Manual

PARTS LOCATION DRAWING
LINKAGE
ASSEMBLY
OPTIONAL ORIFICES (2)

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 into the charge pressure port on the
pump. See the Pump Port Location Drawing.
2. Using a 9/16-inch wrench, loosen the hex lock nut on the null
adjustment screw. See Dimensions and Pump Mounting.
3. Disconnect the electrical line at the connector.
4. Start the prime mover and run at low idle.
To adjust neutral requires operating the pump. Take the
necessary safety precautions such as having unnecessary
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.
5. Warm the system up for several minutes to bleed air.
6. Slowly increase the prime mover speed to rated RPM.
7. If the transmission operates as shown by motor shaft rota-
tion, reduce speed to idle. Using a 3/16-inch internal hex
wrench, slowly turn the null adjustment screw clockwise or
counterclockwise until the transmission does not
Repeat Step 6.
8. With a 3/16-inch internal hex wrench, slowly turn the null
adjustment screw clockwise until charge pressure begins
to decrease. Then slowly turn the adjustment screw coun-
terclockwise, observing the angle of rotation, until charge
pressure decreases again (charge pressure will rise approxi-
mately 20 psi in neutral and drop when going into stroke due
to the shifting of the shuttle valve in the motor manifold).
© Danfoss, 2013
CROSSLINK
BALL
CAVITY
BUSHING
RETAINING
RING
SWASHPLATE FEEDBACK
SHAFT HOLE
Location of Parts When Installing a New Link and Ball Assembly. Separate Assembly Parts
Shown for Information Only; Do Not Attempt to Disassemble.
WARNING
K07116 • Rev AB • September 2013
1858
9. Turn the adjustment screw clockwise half the amount of
the turn observed in Step 8. This should be the center of
neutral.
10. Hold the adjustment screw and securely tighten the hex
lock nut on the adjustment screw to 14 - 18 foot pounds.
Note that if a motor is used which does not have a manifold,
neutral should be adjusted (Steps 8 - 10) by observing the
motor shaft rotation without a load.
11. Stop the prime mover.
12. Reconnect the electrical line.
13.
tionally on both sides of the null command. Swashplate
swashplate feedback shaft, shown in Dimensions and Pump
Mounting.
PUMP PORT LOCATION DRAWING
CASE
DRAIN
PORT
o p e a r . e t
CHARGE
PRESSURE
GAUGE
PORT
1237B
por-
LOCKNUT NULL
ADJUST
1143A
14