TM 5-3895-382-24
Machines with Variable Frequency
Electrical Displacement Control (EDC) Neutral Adjustment
(9XL229-Up, 3WZ158-Up, 2JM579-Up, 4JZ122-Up, 3TM706-
Up, 5BZ119-Up, 6EN127-Up, 2TN118-Up, 1ZN121-Up, 1FS1-
Up, 1XZ1-Up)
Make
reference
to
WARNING
on
first
page
of
Troubleshooting.
NOTE:
Tests should be performed on tires or loose non-
compacted soil. Rubber tires are recommended.
Never operate the vibratory system when the
machine is on concrete.
1.
Make sure the parking brake is applied, and the propel
control lever is in the neutral position.
Vibratory Pump.
(1) Wire harness for electrical displacement control (EDC). (2) Servo
port. (3) Servo port. (4) EDC control neutral adjustment screw. (5)
Locknut
NOTE:
For photographic purposes the pump is shown
out of the machine.
2.
Disconnect wire harness for electrical displacement
control (EDC) (1).
3.
Remove servo port plugs (2) and (3). Install 6V-3965
Quick Disconnects. Install a 600 kPa (1000 psi) gauge
to each Quick Disconnect.
4.
Start and run the engine at low idle rpm.
5.
Loosen the locknut (5) on EDC control neutral
adjustment screw (4) with a 17 mm hex wrench. Turn
the EDC control neutral adjustment screw (4) with a 5
mm internal hex wrench until both gauge readings are
the same.
6.
Turn the EDC control neutral adjustment screw (4)
clockwise until one of the pressure gauge readings
starts to increase. Note the position of the EDC control
neutral adjustment screw (4).
7.
Now turn EDC control neutral adjustment screw (4)
counterclockwise until the reading on the other pressure
gauge begins to increase. Note the position of the EDC
control neutral adjustment screw (4). Turn the EDC
control neutral adjustment screw (4) one-half the
distance to the first screw setting.
8.
Hold EDC control neutral adjustment screw (4) and
tighten locknut (5) to a torque of 14 to 24 Nm (10 to 18
lb-ft).
9.
Stop the engine. Remove the gauges and install servo
port plugs (2) and (3). Connect wire harness for
electrical displacement control (EDC) (1).
NOTE:
The swashplate neutral adjustment procedure
should be performed prior to doing the electrical
displacement control neutral adjustment. The
swashplate neutral adjustment will affect the
gauge readings.
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