7 MAINTENANCE AND LUBRICATION
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7.15 DIESEL PARTICULATE FILTER ______________________________________________
During the operation of the mower, the level of particle material will increase in the Diesel Particulate Filter (DPF)
system. The periodic Regen of the DPF system is needed to remove particle material. During an Active or Parked
Regen, the engine will use more fuel. The DPF system operates in one of four states
Passive Regen State
- The engine operates in the Passive Regen state during normal engine operation. The exhaust
temperature can be more than 572° F (300° C).
Inhibit Regen State
- When the front of the Regen Inhibit switch is momentarily pressed, the engine can not enter the
Active or Parked Regen states. Inhibit Regen does not prevent the Passive Regen. If the fuel tank is near empty, press
the Regen Inhibit switch to the INHIBIT until the fuel tank is filled.
Active Regen State
- When the level of particle material reach a certain point, the engine will enter Active Regen state.
Operation of the mower is not changed. The exhaust temperature can be more than 1150° F (625° C) during Active
Regen. The high exhaust temperatures during Active Regen will illuminate the High Exhaust Temperature light.
Parked Regen State
- When a Parked Regen is needed, the Regen Request on the display will be illuminated. Park
the mower on concrete or gravel to prevent damage to the turf. Engage the parking brake, but do not stop the engine.
Press and release the front part of the Inhibit
Regen switch to start the Parked Regen. During the Parked Regen, the
Regen Request display will illuminate. The high exhaust temperatures during Parked Regen will illuminate the High-
Exhaust Temperature light. Do not disengage the parking brake, stop the engine or move the mower during the Parked
Regen.
A Regen cycle that is not completed will move the engine through six different levels of control.
Level 0
- Normal operation of mower with Passive Regen. When particles reach the Active Regen level, the engine
controller will change to Level 1. When the engine controller is at Level 0, the Active and Parked Regen is disabled.
Level 1
- Engine will enter Active Regen state unless Inhibit Regen switch is in the INHIBIT position. Normal Active
Regen is completed in approximately 20 minutes. If the particle material level does not decrease to the Passive Regen
level in 30 minutes (1800 seconds), the engine controller will change to Level 2. When the engine controller is at Level
1, the Parked Regen is disabled
Level 2
- Regen Request display will illuminate. Engine will enter Active Regen state unless the Inhibit Regen switch
has been pressed. When the mower is parked and the parking brake is engaged, the Parked Regen state is available.
If the engine is operated at Level 2 without a Regen for approximately 1 to 1-1/2 hours, the engine controller will change
to Level 3.
Level 3
- Regen Request will illuminate. The engine power output is decreased and Active Regen is disabled. When
the mower is parked and the parking brake is engaged, the Parked Regen state is available. If the engine is operated at
Level 3 without a Regen for approximately 1 to 1-1/2 hours, the engine controller will change to Level 4.
Level 4
- High Exhaust Temperature display will illuminate. The engine power output is decreased significantly. Active
and Parked Regen is disabled. The Kubota Diagmaster tool is needed to start a Regen. If the engine is operated at
level 4 without a Regen for approximately 1 to 1-1/2 hours, the engine controller will change to Level 5.
Level 5
- High Exhaust Temperature display will flash quickly. The engine power output is decreased significantly. An
authorized Kubota Engine Service Center must clean the DPF before the mower is used.
WARNING
During active or parked regeneration, the temperature of the exhaust components can be more than 1150° F
(625° C). To prevent burns, do not touch a hot exhaust system and do not stand or reach into exhaust gas area
from exhaust pipe outlet. To prevent fires, make sure the engine area is kept clean and the grass clippings are
not near exhaust components. During parked regeneration turn rear wheels fully to the right.
Make sure the exhaust gas from the exhaust pipe is not blocked and there is enough space between the
exhaust pipe and objects. Park the mower on concrete or gravel during parked regeneration. During Active or
parked regeneration exhaust gas from the exhaust pipe can cause turf damage or fire.
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