5, 4, 3, 2 - positions. Road and load conditions sometimes make it desir- able to limit the automatic shifting to a lower range. These positions pro- vide greater engine braking on grades. The transmission will not shift above the highest gear selected. When conditions improve, select po- sition D for full range operation. 1 - Use this gear when pulling through mud and deep snow, or when maneuvering in tight spaces, when driving up or down steep grades where maximum driving power and maximum engine braking is needed. RANGE SELECTOR 11. Range Selector Knob 12. DO NOT SHIFT Light NOTE:
As engine and ground speed increases, the transmission will automatically UPSHIFT to the gear range required up to the highest range selected. However, DOWNSHIFTS will not occur, regardless of gear range selected, until engine and ground speed are reduced to match the next lower gear range requirements. (12) DO NOT SHIFT LIGHT This light comes on anytime the on-board computer finds a potentially serious problem in the system. The computer will cause the transmission to lock- in-gear and also to disengage the lockup clutch. These actions by the computer reduces the possibility of damage to the truck and transmission.
The hold-in- gear feature prevents upshifts and downshifts when a problem is detected in the operation of the transmission. The hold-in-gear circuit permits the transmission to continue to operate in the gear it was in at the time the DO NOT SHIFT light and buzzer came "On". Selection of a different gear range will have no effect on the transmission. The hold-in-gear circuit is released when the engine is shut-off. If the problem causing the DO NOT SHIFT light is still present when the engine is restarted, the transmission will be in " Neutral" and will remain in "Neutral" until the probem is corrected.
RESET PROCEDURE - When the DO NOT SHIFT LIGHT and/or CHECK TRANS light (on instrument panel) comes "On", the system can be reset. To reset, bring the vehicle to a stop at a safe location and shutdown engine. Wait about 10 seconds and restart engine. If the problem is temporary, the DO NOT SHIFT (12) and CHECK TRANS lights will not come back "On" and the truck can be operated in a normal manner. If the problem causing the DO NOT SHIFT light is still present when the engine is restarted or comes again in operation, notify maintenance personnel. HB4010 10/95 Operator Controls HB4-5