Gravely Pro-Walk Hydro 36HR PS Owner's/Operator's Manual page 19

IMPORTANT: Excessive engine idling can
cause engine overheating and carbon build-
up leading to engine damage and poor
performance.
OPERATING UNIT
CAUTION: Avoid injury! Learn the
use of the control levers. Practice at
half throttle until becoming proficient
and comfortable with the operation
of the unit.
Do not move control levers from
forward to reverse or reverse to
forward position rapidly. Sudden
direction changes could cause loss
of control or damage the unit.
CAUTION: Avoid injury! ALWAYS
back up slowly and be sure of your
footing. Look down and behind
before and while backing.
IMPORTANT: Operate unit only when in the
operator's position directly behind controls.
(988156, 157, 158, 159)
1. Adjust mower deck to desired cutting
height. See CUTTING HEIGHT
ADJUSTMENT on page 28.
2. Start and warm up engine. See
STARTING ENGINE on page 18.
3. Move throttle lever to the Fast position.
4. Engage operator presence control
(OPC) lever.
5. Release parking brake.
6. Move PTO/clutch switch to ON position.
7. Grasp safety bar.
8. Drive the unit. The travel speed and turn
rate will vary with the amount that the
control levers are moved.
To drive the unit forward: Push both
control levers (A) forward smoothly and
evenly.
To turn the unit: Pull the control lever
back on the same side as the direction
of the desired turn. Push the other lever
forward.
To stop the unit: Allow both control
levers to return to the neutral position.
To drive the unit in reverse: Pull both
control levers back evenly.
988156, 157, 158, 159
(988153, 154, 155, 169)
The speed control levers are interlocked and
are used to set the unit's fastest forward
speed.
The steering control levers allow independent
control of each hydraulic drive pump to steer,
operate in forward and reverse, and stop the
unit.
The steering lever latches hold the steering
levers in neutral.
WARNING: AVOID INJURY. When
the engine is running and the speed
control levers are engaged,
releasing only one steering latch
causes the unit to circle around one
drive wheel.
ALWAYS hold both steering levers
in the neutral position when
releasing the steering lever latches.
ALWAYS release levers slowly.
To operate:
1. Adjust mower deck to desired cutting
height. See CUTTING HEIGHT
ADJUSTMENT on page 28.
2. Start the engine (See STARTING
ENGINE on page 18).
3. Move throttle lever to the Fast position.
4. Engage operator presence control
(OPC) levers.
5. Release the parking brake.
6. Set speed control levers to desired
speed.
7. Hold steering levers in neutral and
release steering latch levers.
EN - 19