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.

3-55 Section 3 - Operation

Tractor Operation

 

3

 

1

N

 

 

4

 

 

 

2

 

CRUISE

 

 

N

 

 

 

OFF

 

(SET)

 

2

3

1

F3-69

4

F3-56

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..

435/485/535