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435/485/535
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It is never possible to set the cruise higher than the
current throttle lever position.
If the last cruise setting was above the throttle position,
the system will remember that cruise setting unless
the “+/–(SET)” button is pressed in cruise mode. The
cruise RPM will return to the stored cruise setting if
the throttle is moved above that RPM.
The electronic system remembers the current cruise
control setting at all times. The cruise setting remains
in memory after the cruise switch is turned off,
after the engine is shut off, or if the batteries are
disconnected.
Alternate Engine Speed Overrun
The alternative engine speed overrun feature of the
electronic engine controls provide a higher ground
speed when traveling over the road with the tractor.
All QSX 15 engines in 435, 485 and 535 tractors
have a rated engine speed of 2100 RPM. Actual high
idle engine speed, when the throttle lever is placed
in the full forward position, is 2225 +/– 50 RPM.
Overrun of the engine will occur in normal loaded
operating conditions when tractor ground speed is
below approximately 18.5 KPH (11.5 MPH).
In situations where engine load is minimal and
tractor ground speed is high, above 18.5 KPH (above
11.5 MPH), the Electronic Engine Control System
will progress to an alternate engine speed overrun
condition. The full throttle overrun will now be 2350
+/– 50 RPM). An example of this would be a tractor
traveling at 12.9 KPH (8 MPH), over the road, with
the throttle lever fully forward and the cruise switch
in the OFF position. Maximum engine RPM shown on
the EIC of the tractor will be 2225 +/– 50 RPM. If the
transmission is shifted into a higher gear and ground
speed increases above 18.5 KPH (11.5 MPH), the
engine will accelerate to a new higher speed, with the
EIC now displaying a maximum engine speed of 2350
+/– 50 RPM.
If tractor ground speed is reduced below 18.5 KPH
(11.5 MPH), the system will revert to the 6% normal
overrun mode.
IMPORTANT: Loads placed on the engine while roading
(implements, road grade) will affect tractor ground
speed and the alternate speed overrun feature.
Deceleration (manual or pedal) - When in cruise mode
and hand throttle (1) moves lower than the cruise
setting, the cruise RPM decreases as well and stays
100 RPM less than the normal RPM for that throttle
position. The RPM will increase back up to the cruise
setting if the throttle handle is moved forward again.
Example: With the throttle handle at Full Throttle,
the cruise is set to 1800 RPM. When the throttle
handle is moved back past the normal 1800 RPM
position, the cruise speed will drop to 1700 RPM and
continue to decrease as the throttle decreases. When
the handle moves back up to full throttle, the cruise
speed increases until it reaches 1800 RPM again.
F3-56
4
F3-69
(SET)
OFF
CRUISE
N
1
3
2
4
N
2 3 1
Section 3 - Operation
Tractor Operation