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Stopping the engine immediately after it has been working under load can result in overheating and accelerated wear of the engine components. If the engine has been operating at high rpm and/or high loads, run at low idle for at least three minutes to reduce and stabilize internal engine temperature before stopping the engine. Avoiding hot engine shutdowns will maximize turbocharger shaft and bearing life. |
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Stopping the engine immediately after working under load, can result in overheating and accelerated wear of the engine components. Refer to the following stopping procedure, to allow the engine to cool, and to prevent excessive temperatures in the turbocharger center housing and DEF injectors. |
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| Illustration 1 | g06272382 |
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Engine key switch positions (1) Delayed Engine Shutdown Override (2) OFF (3) ON (4) START | |
Note: At any time during a delayed engine shutdown, the engine start switch may be turned to the ON position. The engine may be placed back into service.
- If the delayed engine shutdown is enabled, the engine will shut down after the machine is allowed to idle for a specified time. The delayed engine shutdown shuts down the engine if the following conditions are met:
- The truck body is in the down position.
- The transmission control is in the P position (parking brake applied).
- The service brake is released.
- The accelerator pedal is released.
- The hoist control is not active.
- The retarder lever is not applied.
- The machine lockout is not active.
- The autostall is not active.
- Any of the service tests are not active.
- The ambient temperature is above the minimum setting (to allow the engine to maintain temperature and warmup in cold-weather conditions).
The delayed engine shutdown function does not shut down other systems, such as AC, which can run down the battery after idle shutdown.
Park the machine and engage the parking brake. When the engine start switch is turned off, the engine will go into delay engine shutdown. Allow the delay engine shutdown to complete so that hot areas of the engine and aftertreatment can cool. The length of time of delay engine shutdown may vary depending on the temperature of the exhaust when the engine start switch is keyed off.
An operator can move one of the controls to cancel a shutdown. Using the brake pedal to cancel a shutdown is the recommended option for the operator.
Before the delayed engine shutdown shuts down the engine, the following will occur:
- The action light will flash.
- A popup screen appears on the display screen.
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Never turn the battery disconnect switch key to OFF with the engine running. Electrical system damage could result. |
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| Illustration 2 | g06272371 |
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(1) Battery disconnect switch
(2) Wait to disconnect lamp | |
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Do not turn off the battery disconnect switch until the indicator lamp has turned off. If the switch is turned off when the indicator lamp is illuminated the Diesel Exhaust Fluid (DEF) system will not purge the DEF. If the DEF does not purge, DEF could freeze and damage the pump and lines. |
Delayed Engine Shutdown (If Enabled)
The Delayed Engine Shutdown allows the engine to run for a time after the engine start switch key is turned to the OFF position to cool the engine and system components. The engine start switch key may be removed.
Note: There may be regulations that define the requirements for the operator and/or support personnel to be present when the engine is running.
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Leaving the machine unattended when the engine is running may result in personal injury or death. Before leaving the machine operator station, neutralize the travel controls, lower the work tools to the ground and deactivate all work tools, and place the lever for the hydraulic lockout control in the LOCKED position. |
Note: Leaving the engine unattended while running may result in property damage in the event of a malfunction.
Turn the engine start switch to the OFF position.
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Delayed Engine Shutdown - The delayed engine shutdown indicator will illuminate or the following text will be displayed, ENGINE COOLDOWN ACTIVE. |
Delayed engine shutdown will run whenever the exhaust temperature is above a threshold at engine shutdown. Delayed engine shutdown will run for a minimum of 76 seconds and will continue to run until the engine and system components are cooled. The default maximum run time is 7 minutes.
Note: An authorized dealer can change the maximum run time value up to 30 minutes, but the default setting is 7 minutes.
For more information on the engine start switch, refer to Operation and Maintenance Manual, "Operator Controls".
Note: To override delayed engine shutdown and stop the engine, turn the engine start switch to the Delayed Engine Shutdown Override position. Overriding delayed engine shutdown may reduce engine and system component life. A warning message and/or audible alarm will be initiated and a fault code will be logged for improper engine shutdown.
When the operator determines that an immediate engine shutdown is necessary and needs to disable the delayed engine shutdown feature. Turn the key switch to Delayed Engine Shutdown Override position and hold for 1 second.
Note: A warning message and/or audible alarm will be initiated if Delayed Engine Shutdown Override is used. A fault code will be logged for improper engine shutdown if exhaust temperature is above limit.
Note: If Delayed Engine Shutdown Override is used repeatedly, then there is risk of premature engine and aftertreatment component damage. Use for Emergency Situations only.
The DEF purge process will run for 2 minutes once the engine is shut down and must complete. The purge process may occur during delayed engine shutdown. Do not turn off battery disconnect switch during the purge process. Do not turn off the battery power disconnect switch until the battery disconnect switch indicator lamp has turned off. If the purge process does not complete, a diagnostic code will become active.