Zoomlion RT75, Operator'S Manual

Page: 100 / 178

RT75 Rough Terrain Crane
07 - 7
7.9 TRANSMISSION OPERATION
The transmission is hydraulically driven and power shifted. To step through the gears in
the transmission, follow these points:

The transmission has two gear range levels: low and high. The low gear range is a
manual shift mode. Usually you use the 1
st
gear position when you start to move the
crane. The high gear range is an automatic shift mode.
Note
When you start the engine in automatic shifting mode, the gear lever can be in any of the
position.

If it is necessary to manually shift the transmission, the gear range selector must be in
the low mode.

When you hear an unusual noise in the transmission or it is hard to move the
steering-wheel, stop the crane immediately. Correct the malfunction if you can refer to
the
Transmission Maintenance and Service Manual
.

When you park the crane, move the shift lever to the "N" position.

To measure the quantity of oil in the transmission, park the crane and operate the
engine at idle speed.
The transmission oil temperature must be between 180°F and 200°F (82°C and 93°C).
When the oil temperature is more than 250°F (121.1°C), stop the crane immediately.
To decrease the temperature: move the transmission shift lever to the “N” po
sition.
Operate the engine at an RPM range between 1000 to 1200 rpm. The oil temperature
decreases in a short interval of time immediately.
DO NOT stop the engine when the transmission oil temperature is too high.
DO NOT move the crane when the transmission oil pressure is lower than 240 psi.
DO NOT move the crane with the shift lever in the “N” position.
Warning
Caution
Caution