TSE DPT60, Owner'S Manual

Page: 270 / 459

41
Series 90 Inspections and Adjustments
Neutral Start Switch Adjustment Requirements
90000831E
The NSS must be adjusted to meet the following three
requirements:
i. The distance the control handle can be turned with-
out opening the NSS is called the “NSS Deadband.”
The distance the control handle can be moved with-
out moving the control spool enough to port hydraulic
fluid to the pump displacement control cylinders is
called the “Control Deadband.” These deadbands
must be centered in relation to each other.
Since the position of the control deadband cannot be
adjusted, the position of the NSS deadband must be
adjusted to match it.
ii. The NSS deadband must be wide enough so the NSS
will not open within the loose area of control handle
movement caused by normal operating clearances in
the control linkage (control shaft “free-play”).
By setting the NSS to open outside this area, the
control spool springs or control shaft centering spring
can always act to return the handle to “neutral” and
re-close the NSS.
iii. The NSS deadband must be narrow enough so the
NSS
will open before the unit builds 7 bar (100 psi)
differential system pressure in either direction.
(continued)
Control Shaft
("Free-Play")
Control Shaft
Total Control
Shaft Rotation
Control Deadband
("Neutral")
NSS Deadband
(Switch closed, "ON")