Gradall G6-42P (91404003_Before 0160004017) Operation Manual - Manual (Page 24)

General
The Material Handler covered by this Manual is equipped with hydrostatic drive.
From the operator’s standpoint, operation is similar to driving a vehicle equipped
with an automatic transmission.
Operation
Normal Travel. Direction of travel is selected by moving forward/reverse lever
forward for forward travel, backward for reverse travel. Lift and move lever to
center position for “Neutral”. (See Figure 3-1 for layout of controls)
If hydrostatic drive system senses increased travel load, the system will
compensate automatically by reducing travel speed to match load and engine
RPM.
Inching Travel: Inching travel is provided to permit slow travel speed while
maintaining high engine speed for other handler functions.
The service brake/inching travel pedal controls inching travel.
The upper portion of pedal travel actuates a valve which controls travel pump
output. The greater the pedal travel, the less the pump flow; the less the pump
flow, the slower the travel.
The lower portion of pedal travel actuates the service brake. The greater the
pedal travel, the stronger the brake application. Travel flow is reduced when
brakes begin to apply. (See Figure 7-1)
Four-Wheel Drive: When required by travel conditions, rear-wheel (four-wheel)
drive can be engaged by moving the switch to “4x4” position. Return unit to
two-wheel drive by moving the switch to “4x2” position.
Four-wheel drive can be engaged and disengaged while traveling.
When parking brake is applied, four-wheel drive is disabled.
Traction-Lock Switch: This switch (pedal) controls the traction-lock valve
which functions to restore tractive effort when a wheel tends to spin in four-
wheel drive.
When switch pedal is depressed and held, traction-lock valve forces oil to non-
spinning axle.
DO NOT engage traction-lock function on improved surfaces. Unit must be in
four-wheel drive to engage the traction-lock function.
DO NOT engage traction-lock function if wheels are spinning at a high RPM.
Disengage after traction resumes while in motion.
DRIVE TRAIN 10.0
WARNING !
Bring handler to a complete stop
before shifting forward/reverse
lever when carrying a load. A
sudden change in direction of
travel could reduce stability and/
or cause load to shift or fall.
WARNING !
Practice inching/braking in a safe,
open area until you are thoroughly
familiar with response of machine
to pedal travel.