Komatsu GD555-5 Operation & Maintenance Manual page 94

OPERATION
REMARK
Even in Manual mode, no engine stall occurs as this model has the linked control of torque converter and direct
drive.
When working at F1 and low idle of engine during selection of torque converter Auto mode, the machine can
travel at very slow speeds through acceleration and brake operations.
When selecting torque converter Auto mode and F5 to F8 of the gear shift lever, the machine starts off at F4 in
torque converter state and thereafter the gear speeds automatically change up to the selected one as
appropriate.
When traveling reverse (R1 to R4), the gear shifts in Manual mode are made in the same manner as in torque
converter Auto mode.
When selecting torque converter Auto mode and R3 to R4 of the gear shift lever for reverse travels, the machine
starts off at R2 in torque converter state and thereafter the gear speeds automatically change up to the selected
one as appropriate.
Even if operating the gear shift lever when traveling at high speeds, the gear shift is not actuated as long as there
is possibility of overrun of the engine. After the machine slows down to a speed at which the engine never
overruns, the gear speed automatically changes to the selected one.
NOTICE
Be cautious as some operations possibly apply excessive loads to the lockup clutch and cause failures.
When the torque converter is stalling in torque converter Auto mode, do not switch to Manual mode.
Carry out laden moving (starting of the machine with its blade loaded) in Manual mode at F3 or lower gear speeds.
Before making directional selections halfway on a slope in Manual mode, be sure to stop the machine by applying the brake
even when traveling at low speeds.
Do not make gear shifts halfway on a steep slope in Manual mode.
When entering a slope in Manual mode, select a gear speed suitable for the slope angle and then enter.
DIMMER SWITCH
This switch (9) is used to switch the head lamps between high
beam and low beam.
Position (A): High beam
Position (B): Low beam
EXPLANATION OF COMPONENTS
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