TSE DPT40-B, Owner'S Manual

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39
Series 90 Inspections and Adjustments 8
This adjustment must be made on a test stand or on
the vehicle/machine with the prime mover operating.
WARNING
The following procedure requires the vehicle/
machine to be disabled (wheels raised off the
ground, work function disconnected, etc.) in
order to prevent injury to the technician and
bystanders.
1. Install two 50 bar (or 1000 psi) gauges in each of
the displacement control cylinder gauge ports
(M4 and M5). Disconnect the external control
linkage from the control handle and make certain
the control shaft is in its “neutral” position. Start the
prime mover and operate at normal speed.
2. Loosen the lock nut on the neutral adjusting screw
with a 13 mm hex wrench.
3. Using a 4 mm internal hex wrench, rotate the
neutral adjusting screw clockwise until the pres-
sure increases on one of the pressure gauges.
Note the angular position of the wrench.
4. Rotate the adjusting screw counterclockwise until
the pressure increases by an equal amount on the
other gauge. Note the angular position of the
wrench.
5. Rotate the adjusting screw clockwise half the
distance between the locations noted above. The
gauges should read the same pressure (case
pressure), indicating that the control is in its “neu-
tral” position.
6. Hold the adjusting screw stationary and tighten
the lock nut to 13.6 Nm (10 in•lbf). Do not
overtorque the nut.
7. Once the neutral position is set, stop the prime
mover, remove the gauges, and install the gauge
port plugs. Reconnect the external control link-
age.
90000357
Rotate Neutral Adjusting
Screw
90000358
Tighten Neutral Adjusting
Screw Lock Nut
Variable Displacement Pump with Non-Linear
Manual Displacement Control
90000829
8.2.2 Non-Linear Manual Displacement
Control (MDC)
A centering spring, located on the control input shaft,
locates the control shaft in its “neutral” position. A
bias spring on the control spool maintains a force on
the spool and the control linkage to eliminate loose-
ness (“free-play”) in the linkage.
The “neutral” adjustment is the only adjustment that
can be made on the nonlinear manual displacement
control. All other functions are preset at the factory.
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