Komatsu SK818-5 Operation & Maintenance Manual page 236

HAND & FOOT CONTROL SYSTEM
The auxiliary hydraulic kit control starts and stops the oil flow to any optional equipment and has four positions
(neutral, left, right and coupling position).
1 - Neutral position (N)
(CLOSED HYDRAULIC CIRCUIT)
This position doesn't allow the optional equipment to be
used.
2 - Positions (C ) and (D)
(OPEN HYDRAULIC CIRCUIT).
These positions are used to control optional equipment
with bidirectional oil flow (multi-purpose bucket, drill, as-
phalt cutter, etc.). Rotate the lever (1) to position (C) to de-
liver oil from the male coupling (3) positioned on the left
side of the loader arm, or to position (D) to deliver oil from
the female coupling (4).
234
N
C
E
N
C
C
D
D
C
D
1
RKA10480
D
1
RKA10490
3
4
RKAB1500