38
IV.
OPERATING SYSTEMS
B. HYDROSTATIC DRIVE SYSTEM
COLD WEATHER START-UP PROCEDURE-
The GST20 is equipped with a hydraulic tank temperature sensor to protect the system and prevent
unnecessary wear to the hydraulic components. The machine’s overall performance is limited, until the
hydraulic tank temperature is above 50°F. After starting the engine, if the temperature of the hydraulic oil is
below the 50°F threshold, a warning will show on the machine display and the hydraulic tank temperature will
be shown.
If the machine is being started in ambient temperatures of –25°F or below, the hydraulic
tank must have an external heat source used to warm the oil before starting.
If the Low Hydraulic Oil Temperature warning occurs, please use the following start-up procedure:
With the Spray Boom attached:
Once the tank temperature reaches 50°F, increase the engine RPM to high idle. Move the machine into an
open area where the booms can be unfolded and stop.
1. Un-cradle and completely extend the booms, at the horizontal fold, one at a time.
2. Raise and lower the boom three times.
3. One at a time, raise the boom completely and raise and lower each boom level three times.
4. Lower the booms and extend and retract the boom, at the vertical fold. from 60’ to 90’ three times.
5. Raise and fold the booms back and set them in the cradles.
6. Start the machine moving forward slowly (3 MPH Max) and turn left and right (lock to lock) 3 times.
7. Check the hydraulic tank temperature, if it is above 80° the machine is ready to be used.
NOTE:
Until the tank temperature reaches 50°F the engine RPM will be limited to
low idle (850 RPM). Auxiliary hydraulic functions are also limited until the
tank temperature comes up to operating temperature. The machine’s
movement should be limited until the tank temperature reaches 50°F.
OPERATING SYSTEMS
