Case 621G Stage IV, Original Instructions Manual

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4 - OPERATING INSTRUCTIONS
Declutch switch (4-speed only)
Declutch can increase the speed of the lift arms by tem-
porarily removing the load of the transmission from the
engine. It is often used by operators while approaching a
truck with a full bucket. The Declutch switch will decouple
the transmission from the engine when brake pressure is
sensed, allowing more engine power for hydraulics. This
pressure is adjustable in the display. A higher brake pres-
sure to activate the Declutch function is desirable when
operating on inclines. Higher brake pressure is the result
of increasing brake pedal travel. A lower brake pressure
to activate the Declutch function is desirable when operat-
ing on firm, flat terrain. Lower brake pressure is the result
of limited brake pedal travel. Push the Declutch button
on the side console to activate the Declutch function. De-
clutch pressure adjustment is made in the display (access
to Machine settings/Transmission – see Chapter 3 in this
manual).
LEIL16WHL1125AA
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Powerinch (5-speed only)
Powerinch adjusts the clutch cut-off point depending on
transmission output torque and brake pressure. It con-
trols the vehicle’s tractive force through the brake pedal,
regardless of engine speed. Powerinch is a drive line
management system which improves the operation of the
wheel loader, making it ideal for loading trucks or turning
tight corners. At full hydraulic performance, the tractive
force needed to move the vehicle is limited to the min-
imum required instead of the maximum available. This
principle reduces power loss in the torque converter and
energy loss in the axle service brake. It will aid productiv-
ity, as more power is available for the vehicle hydraulics
and the operator can experience smooth control at high
engine and low driving speeds. It will improve overall han-
dling as well.
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