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To avoid striking overpasses, electrical power lines and obstructions, always lower the body before moving the machine. |
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The machine must be stopped and engine at low idle before changing directions. After moving the shift lever, do not accelerate until after hearing or feeling the transmission clutches engage. |
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| Illustration 1 | g01519384 |
| (1) Transmission control | |
Make sure that the machine is stopped and that the engine is at low idle when you move the transmission control to the PARK position. When the transmission control is in the PARK position, the transmission is in NEUTRAL and the parking brake will engage.
Make sure that the machine is stopped and that the engine is at low idle when you change direction between FORWARD and REVERSE, or between REVERSE and FORWARD.
When you move the transmission control lever from NEUTRAL to any forward speed, first gear is engaged. At low ground speeds, the machine will be in torque converter drive.
When the engine accelerates and the ground speed increases, the transmission automatically upshifts. During higher ground speeds of first gear and of other forward gears, the lockup clutch will be engaged. Then, the machine is in direct drive. When the engine speed slows and the ground speed decreases, the transmission automatically downshifts. During shifts, the machine will be in torque converter drive. Upshifting and downshifting are controlled automatically. The transmission will not shift until the proper ground speed is achieved. You can not force the transmission to shift by moving the transmission control lever.
For more information on the transmission control, refer to Operation and Maintenance Manual, "Operator Controls".
Use the Electronic Technician (ET) to program the gear limit. See Troubleshooting, Systems Operation, Testing and Adjusting, RENR8342, "Chassis Electronic Control system" for additional information.
Shifting is limited in the following situations: engine overspeed protection, coasting in neutral, management of directional shifts, limiting top gear, reverse neutralizer and limiting truck body or water tank up gear.
If the engine speed reaches 2800 rpm, the transmission will upshift to the next higher gear.
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Do not exceed 2800 rpm or engine damage can result. |
The transmission will not shift into NEUTRAL if the machine speed is above
Management of Directional Shifts
If the transmission is in a forward gear and the transmission control is moved into the REVERSE position, the transmission will remain in forward gear until the machine speed is below
The transmission will not shift to a gear above the selected top gear limit. The machine comes from the factory with the highest gear as the top gear limit. Use the Electronic Technician (ET) to change the top gear limit.
If the truck body or the water tank is raised and the transmission is in REVERSE, the transmission will shift into NEUTRAL. The transmission will not shift into REVERSE until the truck body or the water tank is lowered completely and until the transmission control is moved into NEUTRAL. The hoist control must also be in the HOLD or FLOAT position.
Limiting Truck Body or Water Tank Up Gear
The truck body or the water tank up gear limit is programmed to first gear at the factory. The machine will not operate above the programmed gear limit until the truck body or the water tank is completely down. The gear limit must remain set to first gear on machines with a "CE" mark (plate). The "CE" mark is on machines that are compliant with the requirements of the European Union. For machines without the "CE" mark, the truck body or the water tank up gear limit can be changed to second or third gear by using the Electronic Technician (ET) that is available from your local Caterpillar dealer.