MOUNTING THE NEW HARDWARE
Re-check the series number on the control
feedback link to ensure that it is compatible with
the pump. If the control is In MCV106AX9XX
(i.e., control less linkage assembly), follow the
procedure outlined below to install the linkage:
Unscrew the bushing, using care not to
damage its O-ring. See Figure 6.
Install the new linkage assembly shaft
through the swashplate feedback shaft
hole. Place the ball in the crosslink ball
Lubricate the shaft O-ring and replace the
bushing over the shaft. Torque to the
body (10-15 foot-pounds) so that the
Install the retaining ring in the groove on
Align one end of the replacement drag link with
the holes in the swashplate link arms.
Insert the press fit pin through the case drain
port to trap the drag link in the swashplate
clevis. It will be necessary to tap the pin into
place until the head of the pin is flush to the
Install the retaining ring by forcing it onto the
tapered end of the pin until it locks into the
recess on the pin shaft. Again, use caution not
to drop any components into the pump housing.
One .042 inch diameter orifice must be installed
in the supply passage on pressure override-
compatible valves. (See Ordering Information.)
For all others. a .042-inch diameter orifice may
be installed in the supply passage if reduced
swashplate response is desired.
Engage the pin on the control in the drag link
and swing the control into place against the
pump housing. The drag link should be on the
cylinder block side of the swashplate. Install the
seven mounting screws and tighten to 10-11
footpounds of torque.
Connect the pipe or tubing from the control
handle into the C1 and C2 ports (9/16-18 UNF
threads per SAE J514}. Phasing of the HDC is
such that a pressure rise at the C2 port causes a
pressure rise at the A output port of the pump,
given a clockwise
pump prime mover
rotation as viewed into the input shaft.
PUMP NEUTRAL ADJUSTMENT
USE THE FOLLOWING PROCEDURE TO BRING THE
DISPLACEMENT CONTROL HAS BEEN MOUNTED.
Install a 300 psi gauge into the charge pressure
gauge port on the pump. See Figure 7.
Using a 9/16-inch wrench. loosen the hex lock
nut on the null adjustment screw. See Figure 1.
To adjust neutral requires operating
the pump. Take the necessary safety
necessary 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
Set the hydraulic control handle to
Start the prime mover and run at low idle.
Warm the system up for several minutes
to bleed air.
Slowly increase the prime mover speed to
FIGURE 7. Location of pump ports.
PUMP NEUTRAL ADJUSTMENT