PTO - Variable Mode
WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
The PTO speed control mode is used for both stationary and mobile applications. This mode allows PTO to be controlled in a fashion similar to cruise control. The operator is able to hold an engine RPM between 800 and 2200 with the SET switch on the cruise stock or the PTO switch. The operator can "tap up" to increase engine speed in 100 RPM increments with the RESUME switch. The operator may also "tap down" to decrease engine speed with either SET switch on the cruise control multifunction switch or the PTO switch. Vehicles not equipped with cruise control will not have the "tap up" capability.
Power Take-Off (PTO) Description and Operation
| Programmable Parameters | Factory Setting (RPM) | Minimum Value (RPM) | Maximum Value (RPM) |
|---|---|---|---|
| PTO Max Engine Speed | 2200 | L18-2100 LB7-950 |
L18-4200 LB7-3100 |
| PTO Standby RPM | Auto/Manual L18-800/850 LB7-800/800 |
L18-650 LB7-600 Normal engine idle will override if higher than requested PTO Base Idle |
1300 |
| PTO Max Engage Speed | 1000 | 950 | PTO Max Engine Speed |
PTO - Variable Mode Function Chart
| Switch | Set | Resume (w/Cruise Only) |
|---|---|---|
| Pressed Once | Engine speed will decrease by 100 RPM decrements and will maintain new engine speed value. Engine speed can be decreased down to PTO Standby RPM speed value, all further SET inputs will be ignored | Engine Speed will increase by 100 RPM increments and will maintain new engine speed value. Engine speed can be increased up to the PTO max engine speed value, all further RESUME inputs will be ignored |
| Held | Decelerates engine speed down to the PTO standby speed value | Increases engine speed up to the PTO max engine speed value |