Case 580SR Service Manual page 75

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SECTION 21 - TRANSMISSION 9
Transmission disconnection
The 4x4 transmission provides for easy upward and
downward gear ratio changes on the move. Howev-
er, as a clutch is not used between the engine and
transmission, the power flow from the engine to the
transmission must be interrupted to shift from one
gear ratio to another. This is accomplished by using
a transmission disconnect (dump) button.
The finger operated button (2) on the main gearshift
lever knob (1) is easy to operate.
S
WARNING
To avoid personal injury do not use the disconnect
switch control to coast down hill. Excessive speed
may cause loss of control, personal injury to a by-
stander or failure of the transmission.
To make upward gear ratio changes simply depress
and hold the button (2) on the gearshift lever (1),
while moving the lever from one gear ratio to anoth-
er. When the desired gear ratio has been selected
release the button and allow the unit to gain engine
speed and ground speed. If another higher ratio is re-
quired repeat the procedure.
IMPORTANT: to prevent possible damage to the
transmission hydraulic clutches, never use the dis-
connect switch for inching the machine forward.
Inching the machine forward with the button will
cause the clutches to slip excessively and overheat.
To make downward gear ratio changes or reduce
ground speed, simply lower the engine speed, de-
press and hold the gearshift lever button and down-
shift the transmission.
When the desired gear ratio has been selected re-
lease the button and adjust the engine speed to suit
ground speed required.
Operating the machine in a too high gear or under a
too heavy load will cause the torque converter to slip
excessively and overheat. If the machine is over-
loaded, the engine speed will not exceed a range of
1800-2200 rpm at maximum accelerator and the
torque converter will "stall" bringing the machine to a
complete stop.
If "stall" does occur, there is still sufficient engine
power to operate the loader however, to prevent the
transmission from overheating, either reduce the
load on the machine or select a lower gear ratio.